updated deploy

Dockerfile

@@ -11,6 +11,8 @@ COPY . .
 ARG TARGETOS
 ARG TARGETARCH
 
+LABEL org.opencontainers.image.source="https://git.miaurizius.de/miaurizius/miauinv"
+
 RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH \
     go build -ldflags "-s -w" -o MiauInv .
 

README.md

@@ -0,0 +1,189 @@
+# MiauInv - Inventory and Project Management System
+
+MiauInv is a secure, light-weight inventory, stock, and project allocation tracking system written in Go. It utilizes HTMX for a dynamic, reactive single-page experience over traditional server-rendered HTML blocks, backed by an encrypted JWT and dual-token refresh architecture alongside an embedded SQLite instance.
+
+## Table of Contents
+
+* [Technical Specifications](#technical-specifications)
+* [Architecture Overview](#architecture-overview)
+* [Configuration](#configuration)
+    * [Configuration File (config.yaml)](#configuration-file-configyaml)
+    * [Environment Variables](#environment-variables)
+* [Route and Endpoint Matrix](#route-and-endpoint-matrix)
+    * [Frontend Web Routes (HTML Views)](#frontend-web-routes-html-views)
+    * [Backend API Endpoints (JSON Serialization)](#backend-api-endpoints-json-serialization)
+* [Setup and Deployment Tutorial](#setup-and-deployment-tutorial)
+    * [Prerequisites](#prerequisites)
+    * [Option 1: Native Local Deployment](#option-1-native-local-deployment)
+    * [Option 2: Docker Deployment (Recommended)](#option-2-docker-deployment-recommended)
+
+## Technical Specifications
+
+* **Backend Language:** Go (Golang 1.22+)
+* **Frontend Interactivity:** HTMX (v2.0.4) & Vanilla JavaScript (API Client integration)
+* **Database Engine:** SQLite (via standard driver dependencies)
+* **Security & Session Layer:** JSON Web Tokens (JWT) with HTTP-Only/Secure dual cookie strategy (Access and Refresh Token Rotation)
+* **Styling Architecture:** Modern dark-theme customized native CSS variables (`--bg`, `--card`, `--accent`, `--border`)
+* **Transport Security:** Compulsory HTTPS / Native TLS Listener implementation
+
+---
+
+## Architecture Overview
+
+MiauInv splits responsibility cleanly across modularized architecture packages:
+
+* **`main.go`**: Entrypoint initializing components and connecting layers.
+* **`server/`**: Configures variables, spins up TLS mechanisms, and exposes route endpoints.
+* **`auth/`**: Custom HTTP Middleware interceptors validating JWT signatures and parsing sub-claims.
+* **`handlers/`**: Core API Controller actions processing CRUD functions on database entities.
+* **`storage/`**: Direct abstraction queries interacting with the underlying SQLite database schema.
+* **`frontend/`**: Serving standard static assets and injecting structural data into components.
+
+---
+
+## Configuration
+
+The system uses a combination of a structural JSON configuration file and environment variables for system runtime flags.
+
+### Configuration File (`config.yaml`)
+
+The application automatically creates or reads a configuration file named `config.json` in the working directory on startup.
+
+```yaml
+port: "8080"
+database_path: ./appdata/database.db
+certificate_path: ./appdata/cert.pem
+private_key_path: ./appdata/key.pem
+allow_registration: true
+```
+
+### Environment Variables
+
+For cryptographic functions, a mandatory environment variable must be exported before executing the binary:
+
+| Variable | Type | Description | Minimum Requirement |
+| --- | --- | --- | --- |
+| `JWT_SECRET` | String | Symmetric secret signature key used to sign access tokens | Minimum 32 characters |
+
+---
+
+## Route and Endpoint Matrix
+
+All communication with the application happens over defined HTTP transport interfaces. The routes are divided into User-Facing Views (HTML renders) and programmatic Data Hooks (JSON APIs).
+
+### Frontend Web Routes (HTML Views)
+
+| Route Path | HTTP Method | Auth Required | Description |
+| --- | --- | --- | --- |
+| `/` | `GET` | No | Root index landing view. |
+| `/login` | `GET` | No | Renders login page component. |
+| `/register` | `GET` | No | Registration layout or block alert based on authorization properties. |
+| `/dashboard` | `GET` | **Yes** | Aggregated stats layout covering items, projects, and locations. |
+| `/inventory` | `GET` | **Yes** | General overview interface managing stock quantities. |
+| `/items` | `GET` | **Yes** | Standard component interface targeting primary atomic assets. |
+| `/locations` | `GET` | **Yes** | Physical or logical facility structures view. |
+| `/projects` | `GET` | **Yes** | Overview interface listing active construction and logistics operations. |
+| `/profile/` | `GET` | **Yes** | Component context under development. |
+| `/assets/*` | `GET` | No | Serves global minified system design files (`.css`, `.js`). |
+
+### Backend API Endpoints (JSON Serialization)
+
+| Endpoint Path | Method | Auth | Query Parameters | Request/Response Behavior |
+| --- | --- | --- | --- | --- |
+| `/api/register` | `POST` | No | None | Creates a new user record. Requires plain JSON payload containing raw `username` and `password`. Returns status code `201 Created`. |
+| `/api/login` | `POST` | No | None | Performs credential authentication. Sets `access_token` and `refresh_token` as secure, HTTP-Only cookies, and returns user identity metadata. |
+| `/api/refresh` | `POST` | No | None | Accepts JSON containing `refresh_token`. Invalidates previous token structures, rotates identities, and hands over a newly active pair. |
+| `/api/logout` | `POST` | **Yes** | None | Revokes active database-linked refresh session IDs for the user context and drops current browser state tracking. Returns status `204`. |
+| `/api/profile` | `GET` | **Yes** | `id` *(Optional)* | Returns `id`, `username`, and metadata of either the target parameter or active identity mapped from token signatures. |
+| `/api/item` | `GET` | **Yes** | `id` *(Optional)* | Empty parameters fetch all available items with aggregated `allocated` and `available` calculations. Providing `id` isolates a specific item. |
+| `/api/item` | `POST` | **Yes** | None | Inserts a new tracked inventory item schema definition. |
+| `/api/item` | `PUT` | **Yes** | `id` *(Required)* | Modifies values (`name`, `category`, `description`, `total_quantity`) of an active asset by primary key. |
+| `/api/item` | `DELETE` | **Yes** | `id` *(Required)* | Removes an entry. SQLite blocks cascade execution if foreign key assignments still exist in stock or project tracking. |
+| `/api/location` | `GET` | **Yes** | `id`, `content` | Fetching with `id` and `content=true` extracts an array of items grouped at the facility (`item_id`, `name`, `quantity`). Without `content`, returns details or global catalogs. |
+| `/api/location` | `POST` | **Yes** | None | Instantiates a singular distinct location boundary identifier. |
+| `/api/location` | `PUT` | **Yes** | `id` *(Required)* | Renames a location while maintaining foreign keys. |
+| `/api/location` | `DELETE` | **Yes** | `id` *(Required)* | Destroys location configurations if currently cleared of active items. |
+| `/api/project` | `GET` | **Yes** | `id`, `details` | Providing `id` with `details=true` unrolls associated items allocated to that project context. |
+| `/api/project` | `POST` | **Yes** | None | Inserts a tracking context entity for targeted hardware allocation. |
+| `/api/project` | `PUT` | **Yes** | `id` *(Required)* | Updates a project metadata record definition. |
+| `/api/project` | `DELETE` | **Yes** | `id` *(Required)* | Drops an empty project wrapper. |
+| `/api/stock` | `GET` | **Yes** | `id` *(Optional)* | Obtains exact relationship matrices between location nodes and items. |
+| `/api/stock` | `POST` | **Yes** | None | Links allocations across specific site nodes. |
+| `/api/stock` | `PUT` | **Yes** | `id` *(Required)* | Modifies stock metrics directly on specified maps. |
+| `/api/stock` | `DELETE` | **Yes** | `id` *(Required)* | Completely severs relationship entry allocations between nodes. |
+| `/api/association` | `GET` | **Yes** | `id`, `project_id` | Dumps general configuration links, isolated optionally by operational `project_id`. |
+| `/api/association` | `POST` | **Yes** | None | Allocates an inventory batch to a dedicated project infrastructure requirement. |
+| `/api/association` | `PUT` | **Yes** | `id` *(Required)* | Alters active quantity indicators inside a specific deployment matrix. |
+| `/api/association` | `DELETE` | **Yes** | `id` *(Required)* | Frees up allocations, returning tracking variables back to unassigned states. |
+
+---
+
+## Setup and Deployment Tutorial
+
+### Prerequisites
+
+Before deployment, you must generate SSL/TLS certificates since MiauInv enforces native transport encryption layer communication (or use a bought one).
+
+```bash
+# Create directory for certs
+mkdir -p appdata
+
+# Generate self-signed certificate and private key
+openssl req -x509 -newkey rsa:4096 -keyout appdata/key.pem -out certs/cert.pem -sha256 -days 365 -nodes
+
+```
+
+### Option 1: Native Local Deployment
+
+1. Make sure your Go environment path variable properties are populated (Go 1.22+).
+2. Create your environmental token and execute the initialization routine task:
+
+```bash
+export JWT_SECRET="your_minimum_thirty_two_char_secret_key_here"
+go build -o miauinv main.go
+./miauinv
+
+```
+
+---
+
+### Option 2: Docker Deployment (Recommended)
+
+MiauInv includes container definition orchestrations to package configurations cleanly, binding storage databases outside running containers into persistent volumes.
+
+#### 1. Create the Docker Compose Descriptor
+
+Write the configuration definition mapping layer blocks directly inside a standard file named `docker-compose.yaml`:
+
+```yaml
+services:
+  miauinv:
+    image: git.miaurizius.de/miaurizius/miauinv:latest
+    container_name: MiauInv
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    environment:
+      - JWT_SECRET=SECURE_RANDOM_STRING # Must be at least 32 characters long
+    volumes:
+      - ./appdata:/appdata # To edit your configuration files
+
+```
+
+#### 2. Execution Commands
+
+To bring up your background container image instance pipelines, execute the compose environment controls:
+
+```bash
+# Build and execute the container in background detached mode
+docker-compose up --build -d
+
+# Verify container operation statuses
+docker-compose ps
+
+# Monitor execution system logs
+docker-compose logs -f
+
+```
+
+Once running successfully via Docker orchestration loops, navigate your web browser context safely to `https://localhost:8080` to interact with your MiauInv control panel workspace.

ad.html

@@ -0,0 +1,407 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>MiauInv - Modern Inventory & Project Management</title>
+    <style>
+        :root {
+            --bg: #0b0f19;
+            --card: #111827;
+            --border: #1f2937;
+            --text: #f9fafb;
+            --text-muted: #9ca3af;
+            --accent: #3b82f6;
+            --accent-hover: #2563eb;
+            --success: #10b981;
+            --code-bg: #1f2937;
+        }
+
+        * {
+            box-sizing: border-box;
+            margin: 0;
+            padding: 0;
+        }
+
+        body {
+            background-color: var(--bg);
+            color: var(--text);
+            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            line-height: 1.6;
+            padding: 0;
+            margin: 0;
+        }
+
+        .navbar {
+            display: flex;
+            justify-content: flex-end;
+            padding: 1rem 2rem;
+            max-width: 1000px;
+            margin: 0 auto;
+        }
+
+        .lang-switch {
+            background: var(--card);
+            border: 1px solid var(--border);
+            color: var(--text);
+            padding: 0.5rem 1rem;
+            border-radius: 8px;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.2s ease;
+        }
+
+        .lang-switch:hover {
+            border-color: var(--accent);
+            color: var(--accent);
+        }
+
+        .container {
+            max-width: 1000px;
+            margin: 0 auto;
+            padding: 0 1.5rem 4rem 1.5rem;
+        }
+
+        header {
+            text-align: center;
+            padding: 3rem 0 3rem 0;
+        }
+
+        .brand {
+            font-size: 3.5rem;
+            font-weight: 800;
+            letter-spacing: -0.04em;
+            margin-bottom: 1rem;
+        }
+
+        .brand span {
+            color: var(--accent);
+        }
+
+        .tagline {
+            font-size: 1.25rem;
+            color: var(--text-muted);
+            max-width: 600px;
+            margin: 0 auto 2.5rem auto;
+        }
+
+        .badge-container {
+            display: flex;
+            justify-content: center;
+            gap: 0.75rem;
+            margin-bottom: 3rem;
+            flex-wrap: wrap;
+        }
+
+        .badge {
+            background: rgba(59, 130, 246, 0.1);
+            color: var(--accent);
+            border: 1px solid rgba(59, 130, 246, 0.2);
+            padding: 0.35rem 0.75rem;
+            border-radius: 999px;
+            font-size: 0.85rem;
+            font-weight: 600;
+        }
+
+        .badge.green {
+            background: rgba(16, 185, 129, 0.1);
+            color: var(--success);
+            border-color: rgba(16, 185, 129, 0.2);
+        }
+
+        .grid {
+            display: grid;
+            grid-template-columns: 1fr;
+            gap: 2rem;
+            margin-bottom: 4rem;
+        }
+
+        @media (min-width: 768px) {
+            .grid {
+                grid-template-columns: 1fr 1fr;
+            }
+        }
+
+        .card {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 16px;
+            padding: 2.5rem;
+            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
+        }
+
+        .card h2 {
+            font-size: 1.5rem;
+            font-weight: 700;
+            margin-bottom: 1.25rem;
+            letter-spacing: -0.02em;
+        }
+
+        .features-list {
+            list-style: none;
+            text-align: left;
+        }
+
+        .features-list li {
+            margin-bottom: 1rem;
+            display: flex;
+            align-items: flex-start;
+            gap: 0.75rem;
+            color: var(--text-muted);
+        }
+
+        .features-list li strong {
+            color: var(--text);
+        }
+
+        .features-list svg {
+            flex-shrink: 0;
+            margin-top: 0.2rem;
+            color: var(--success);
+        }
+
+        .install-section {
+            background: var(--card);
+            border: 1px solid var(--border);
+            border-radius: 16px;
+            padding: 3rem 2rem;
+            text-align: left;
+            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
+            margin-bottom: 4rem;
+        }
+
+        .install-section h2 {
+            font-size: 1.75rem;
+            margin-bottom: 0.5rem;
+            letter-spacing: -0.02em;
+        }
+
+        .install-section p {
+            color: var(--text-muted);
+            margin-bottom: 2rem;
+        }
+
+        .step {
+            margin-bottom: 2rem;
+        }
+
+        .step h3 {
+            font-size: 1.1rem;
+            margin-bottom: 0.75rem;
+            color: var(--text);
+            display: flex;
+            align-items: center;
+            gap: 0.5rem;
+        }
+
+        .step-num {
+            background: var(--border);
+            width: 24px;
+            height: 24px;
+            border-radius: 50%;
+            display: inline-flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 0.8rem;
+            font-weight: bold;
+        }
+
+        pre {
+            background: var(--bg);
+            border: 1px solid var(--border);
+            padding: 1rem 1.25rem;
+            border-radius: 10px;
+            font-family: monospace;
+            font-size: 0.9rem;
+            color: #e5e7eb;
+            overflow-x: auto;
+            white-space: pre;
+            margin-bottom: 1rem;
+        }
+
+        footer {
+            text-align: center;
+            padding: 3rem 0;
+            color: var(--text-muted);
+            font-size: 0.9rem;
+            border-top: 1px solid var(--border);
+        }
+
+        /* Sprach-Sichtbarkeitsregeln */
+        [lang="de"] { display: none; }
+        html[data-lang="de"] [lang="de"] { display: block; }
+        html[data-lang="de"] [lang="en"] { display: none; }
+
+        html[data-lang="de"] span[lang="de"],
+        html[data-lang="de"] strong[lang="de"] {
+            display: inline;
+        }
+        html[data-lang="en"] span[lang="en"],
+        html[data-lang="en"] strong[lang="en"] {
+            display: inline;
+        }
+    </style>
+</head>
+<body class="lang-en">
+
+<div class="navbar">
+    <button class="lang-switch" id="langBtn" onclick="toggleLanguage()">DE</button>
+</div>
+
+<div class="container">
+    <header>
+        <div class="brand">Miau<span>Inv</span></div>
+        <p class="tagline" lang="en">A secure, light-weight, and minimalistic management system for tracking your inventory stock and project allocations.</p>
+        <p class="tagline" lang="de">Ein sicheres, pfeilschnelles und minimalistisches System für deine Lagerbestände und Projekt-Zuweisungen.</p>
+
+        <div class="badge-container">
+            <span class="badge">Go Backend</span>
+            <span class="badge">HTMX Frontend</span>
+            <span class="badge">SQLite Inside</span>
+            <span class="badge green">Docker Ready</span>
+        </div>
+    </header>
+
+    <div class="grid">
+        <div class="card">
+            <h2 lang="en">Why MiauInv?</h2>
+            <h2 lang="de">Warum MiauInv?</h2>
+            <ul class="features-list">
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Zero JS-Overhead:</strong><strong lang="de">Kein JS-Overhead:</strong>
+                            <span lang="en"> Powered by HTMX for an ultra-reactive, dynamic SPA experience without heavy client-side bundles.</span>
+                            <span lang="de"> Dank HTMX extrem reaktiv und dynamisch wie eine SPA, aber ohne tonnenweise schweres JavaScript.</span>
+                        </span>
+                </li>
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Live Quantities:</strong><strong lang="de">Live-Verfügbarkeit:</strong>
+                            <span lang="en"> See overall totals, allocated project metrics, and remaining available counts instantly.</span>
+                            <span lang="de"> Siehst sofort den Gesamtbestand, was in Projekten verplant ist und was noch frei zur Verfügung steht.</span>
+                        </span>
+                </li>
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Unified Dashboards:</strong><strong lang="de">Orte & Projekte im Blick:</strong>
+                            <span lang="en"> Drill straight down into site boundaries or project lists to inspect stock components with one click.</span>
+                            <span lang="de"> Klicke auf Lagerorte oder aktive Projekte im Dashboard, um direkt den aktuellen Inhalt einzusehen.</span>
+                        </span>
+                </li>
+            </ul>
+        </div>
+
+        <div class="card">
+            <h2 lang="en">Security & Tech Stack</h2>
+            <h2 lang="de">Sicherheit & Tech</h2>
+            <ul class="features-list">
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Dual-Token Security:</strong><strong lang="de">Dual-Token Security:</strong>
+                            <span lang="en"> Uses robust cryptographically signed JWT cookies combined with seamless backend refresh token rotations.</span>
+                            <span lang="de"> Zugriffsschutz über sichere, verschlüsselte JWT-Cookies inkl. Refresh-Token-Rotation.</span>
+                        </span>
+                </li>
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Native TLS Listener:</strong><strong lang="de">Native TLS Listener:</strong>
+                            <span lang="en"> Out-of-the-box enforced HTTPS transport layer security powered directly by Go's core networking.</span>
+                            <span lang="de"> Enforcierte HTTPS-Verschlüsselung direkt aus dem Go-Core heraus.</span>
+                        </span>
+                </li>
+                <li>
+                    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
+                    <span>
+                            <strong lang="en">Ultra Lightweight:</strong><strong lang="de">Leichtgewicht:</strong>
+                            <span lang="en"> Runs on absolute minimal system footprint resource margins using an embedded optimized SQLite model.</span>
+                            <span lang="de"> Minimaler Ressourcenverbrauch dank kompilierter Go-Binary und eingebetteter SQLite-Datenbank.</span>
+                        </span>
+                </li>
+            </ul>
+        </div>
+    </div>
+
+    <div class="install-section">
+        <h2 lang="en">Install Your Server</h2>
+        <h2 lang="de">Server installieren</h2>
+
+        <p lang="en">Deploy MiauInv to your server infrastructure or local machine in less than a minute utilizing our streamlined container configurations.</p>
+        <p lang="de">MiauInv lässt sich dank vorkonfiguriertem Docker-Setup innerhalb weniger Sekunden auf deinem Server oder lokalen System starten.</p>
+
+        <div class="step">
+            <h3>
+                <span class="step-num">1</span>
+                <span lang="en">Setup Asset Directories and TLS</span>
+                <span lang="de">Ordner und Zertifikate vorbereiten</span>
+            </h3>
+            <p lang="en">Since MiauInv natively enforces encrypted communication channels, initialize your tracking asset directory and place your TLS files there (or generate a self-signed keypair for testing targets):</p>
+            <p lang="de">Da MiauInv standardmäßig verschlüsseltes HTTPS erzwingt, erstelle den Appdata-Ordner und lege deine SSL-Zertifikate ab (oder generiere ein Self-Signed Cert für Tests):</p>
+            <pre>mkdir -p appdata
+openssl req -x509 -newkey rsa:4096 -keyout appdata/key.pem -out appdata/cert.pem -sha256 -days 365 -nodes -subj "/CN=localhost"</pre>
+        </div>
+
+        <div class="step">
+            <h3>
+                <span class="step-num">2</span>
+                <span lang="en">Configure Docker Compose</span>
+                <span lang="de">Docker Compose Datei anlegen</span>
+            </h3>
+            <p lang="en">Create a <code>docker-compose.yaml</code> layout file in the parent folder, and inject the orchestration service blocks. Ensure your <code>JWT_SECRET</code> environment variable meets the minimum security threshold length requirements:</p>
+            <p lang="de">Erstelle eine <code>docker-compose.yaml</code> im selben Verzeichnis und füge folgenden Inhalt ein. Passe den <code>JWT_SECRET</code>-String an:</p>
+            <pre>services:
+  miauinv:
+    image: git.miaurizius.de/miaurizius/miauinv:latest
+    container_name: MiauInv
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    environment:
+      - JWT_SECRET=SECURE_RANDOM_STRING_HERE_MIN_32_CHARS
+    volumes:
+      - ./appdata:/appdata</pre>
+        </div>
+
+        <div class="step">
+            <h3>
+                <span class="step-num">3</span>
+                <span lang="en">Boot the Environment</span>
+                <span lang="de">Container starten</span>
+            </h3>
+            <p lang="en">Fire up the production background workers by executing your infrastructure controls daemon tasks:</p>
+            <p lang="de">Führe nun einfach den Start-Befehl aus, um das Image zu ziehen und im Hintergrund zu starten:</p>
+            <pre>docker-compose up -d</pre>
+
+            <p style="margin-top: 0.5rem;" lang="en">Everything is set up! Your instance is running and fully accessible at <strong>https://localhost:8080</strong>.</p>
+            <p style="margin-top: 0.5rem;" lang="de">Fertig! Dein Server läuft und ist sofort unter <strong>https://localhost:8080</strong> erreichbar.</p>
+        </div>
+    </div>
+
+    <footer>
+        <p lang="en">&copy; 2026 Maurice Larivière.</p>
+        <p lang="de">&copy; 2026 Maurice Larivière.</p>
+    </footer>
+</div>
+
+<script>
+    function setLanguage(lang) {
+        document.documentElement.setAttribute('data-lang', lang);
+        document.getElementById('langBtn').innerText = lang === 'en' ? 'DE' : 'EN';
+        localStorage.setItem('miauinv-lang', lang);
+    }
+
+    function toggleLanguage() {
+        const currentLang = document.documentElement.getAttribute('data-lang') || 'en';
+        const nextLang = currentLang === 'en' ? 'de' : 'en';
+        setLanguage(nextLang);
+    }
+
+    const savedLang = localStorage.getItem('miauinv-lang') || 'en';
+    setLanguage(savedLang);
+</script>
+</body>
+</html>

auth/middleware.go

@@ -10,27 +10,62 @@ type contextKey string
 
 const UserContextKey contextKey = contextKey("user")
 
+// middleware.go
 func AuthMiddleware(secret []byte) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 
-			authHeader := r.Header.Get("Authorization")
+			// WICHTIG: Wenn der User auf einer öffentlichen Seite ist,
-			if authHeader == "" {
+			// darf die Middleware KEINEN Auth-Zwang ausüben und nicht redirecten!
-				http.Error(w, "Missing token", http.StatusUnauthorized)
+			if r.URL.Path == "/login" || r.URL.Path == "/register" || r.URL.Path == "/" {
+				next.ServeHTTP(w, r)
 				return
 			}
 
-			tokenStr := strings.TrimPrefix(authHeader, "Bearer ")
+			tokenStr := ""
+			authHeader := r.Header.Get("Authorization")
+
+			if strings.HasPrefix(authHeader, "Bearer ") {
+				tokenStr = strings.TrimPrefix(authHeader, "Bearer ")
+			}
+
+			if tokenStr == "" {
+				cookie, err := r.Cookie("access_token")
+				if err == nil {
+					tokenStr = cookie.Value
+				}
+			}
+
+			if tokenStr == "" {
+				if strings.HasPrefix(r.URL.Path, "/api/") {
+					http.Error(w, "Missing token", http.StatusUnauthorized)
+				} else {
+					http.Redirect(w, r, "/login", http.StatusSeeOther)
+				}
+				return
+			}
 
 			claims, err := ValidateJWT(tokenStr, secret)
 			if err != nil {
+				if strings.HasPrefix(r.URL.Path, "/api/") {
 					http.Error(w, "Invalid token", http.StatusUnauthorized)
+				} else {
+					// Falls das Cookie korrupt oder abgelaufen ist, löschen wir es direkt,
+					// damit das Frontend sauber merkt, dass es weg ist.
+					http.SetCookie(w, &http.Cookie{
+						Name:     "access_token",
+						Value:    "",
+						Path:     "/",
+						MaxAge:   -1,
+						HttpOnly: false, // Erlaubt JS das Auslesen
+					})
+					http.Redirect(w, r, "/login", http.StatusSeeOther)
+				}
 				return
 			}
 
 			ctx := context.WithValue(r.Context(), UserContextKey, claims)
 			next.ServeHTTP(w, r.WithContext(ctx))
-
 		})
 	}
 }

config/config.go

@@ -13,6 +13,7 @@ type Config struct {
 	DatabasePath      string `yaml:"database_path"`
 	CertificatePath   string `yaml:"certificate_path"`
 	PrivateKeyPath    string `yaml:"private_key_path"`
+	AllowRegistration bool   `yaml:"allow_registration"`
 }
 
 const configPath = "./appdata/config.yaml"
@@ -38,6 +39,7 @@ func CheckIfExists() error {
 		DatabasePath:      "./appdata/database.db",
 		CertificatePath:   "./appdata/cert.pem",
 		PrivateKeyPath:    "./appdata/key.pem",
+		AllowRegistration: true,
 	}
 
 	data, err := yaml.Marshal(defaultConfig)

deploy.sh

@@ -0,0 +1,5 @@
+sudo docker buildx build \
+  --platform linux/amd64,linux/arm64 \
+  -t git.miaurizius.de/miaurizius/miauinv:latest \
+  -t git.miaurizius.de/miaurizius/miauinv:v1.0.0 \
+  --push .

frontend/assets/css/dashboard.css

@@ -0,0 +1,344 @@
+.dashboard-layout {
+    justify-content: flex-start;
+    align-items: stretch;
+    padding: 0;
+}
+
+main {
+    max-width: 1400px;
+    width: 100%;
+    margin: 0 auto;
+    padding: 2rem;
+    flex: 1;
+}
+
+.page-header h1 {
+    font-size: 2.2rem;
+    font-weight: 700;
+    letter-spacing: -0.03em;
+    margin-bottom: 2rem;
+    color: var(--text);
+}
+
+header {
+    width: 100%;
+    border-bottom: 1px solid var(--border);
+    background: rgba(31, 41, 55, 0.8);
+    backdrop-filter: blur(12px);
+    position: sticky;
+    top: 0;
+    z-index: 50;
+}
+
+.nav-container {
+    max-width: 1400px;
+    margin: 0 auto;
+    padding: 0 2rem;
+    height: 4.5rem;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+
+.nav-left {
+    display: flex;
+    align-items: center;
+    gap: 3rem;
+    height: 100%;
+}
+
+.brand {
+    font-weight: 800;
+    font-size: 1.4rem;
+    letter-spacing: -0.03em;
+}
+
+.brand span {
+    color: var(--accent);
+}
+
+nav {
+    display: flex;
+    gap: 1.5rem;
+    height: 100%;
+}
+
+nav a {
+    color: var(--text-muted);
+    text-decoration: none;
+    font-size: 0.95rem;
+    font-weight: 500;
+    display: inline-flex;
+    align-items: center;
+    border-bottom: 2px solid transparent;
+    padding: 0 0.25rem;
+    transition: color 0.2s ease, border-color 0.2s ease;
+}
+
+nav a:hover, nav a.active {
+    color: var(--text);
+    border-color: var(--accent);
+}
+
+.profile-dropdown {
+    position: relative;
+    display: flex;
+    align-items: center;
+    height: 100%;
+}
+
+.profile-trigger {
+    background: none;
+    border: none;
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    color: var(--text);
+    cursor: pointer;
+    padding: 0.5rem;
+    border-radius: 8px;
+    transition: background-color 0.2s ease;
+}
+
+.profile-trigger:hover {
+    background-color: rgba(255, 255, 255, 0.05);
+}
+
+.avatar {
+    width: 2.2rem;
+    height: 2.2rem;
+    background-color: var(--accent);
+    color: #ffffff;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-weight: 600;
+    font-size: 0.9rem;
+}
+
+.username {
+    font-size: 0.95rem;
+    font-weight: 500;
+    display: none;
+}
+
+@media (min-width: 640px) {
+    .username {
+        display: block;
+    }
+}
+
+.dropdown-menu {
+    position: absolute;
+    top: calc(100% - 0.5rem);
+    right: 0;
+    width: 220px;
+    background: #1f2937;
+    border: 1px solid var(--border);
+    border-radius: 12px;
+    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
+    display: none;
+    flex-direction: column;
+    padding: 0.5rem 0;
+    z-index: 100;
+}
+
+.profile-dropdown:hover .dropdown-menu,
+.dropdown-menu.show {
+    display: flex;
+}
+
+.dropdown-menu a, .logout-btn {
+    width: 100%;
+    padding: 0.75rem 1.25rem;
+    font-size: 0.95rem;
+    color: var(--text-muted);
+    text-decoration: none;
+    text-align: left;
+    background: none;
+    border: none;
+    cursor: pointer;
+    transition: background-color 0.15s ease, color 0.15s ease;
+    box-sizing: border-box;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+}
+
+.dropdown-menu a:hover {
+    background-color: rgba(255, 255, 255, 0.05);
+    color: var(--text);
+}
+
+.dropdown-divider {
+    border: 0;
+    border-top: 1px solid var(--border);
+    margin: 0.5rem 0;
+}
+
+.logout-btn {
+    color: #ef4444;
+    font-weight: 500;
+}
+
+.logout-btn:hover {
+    background-color: rgba(239, 68, 68, 0.1);
+    color: #f87171;
+}
+
+.stats-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+    gap: 1.5rem;
+    margin-bottom: 2rem;
+}
+
+.stat-card {
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 1.75rem;
+    display: flex;
+    align-items: center;
+    gap: 1.5rem;
+    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+    transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+
+.stat-card:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
+}
+
+.stat-icon {
+    width: 3.5rem;
+    height: 3.5rem;
+    border-radius: 12px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.stat-info h2 {
+    font-size: 2rem;
+    font-weight: 700;
+    letter-spacing: -0.03em;
+    margin: 0;
+    color: var(--text);
+    line-height: 1.2;
+}
+
+.stat-info p {
+    color: var(--text-muted);
+    font-size: 0.9rem;
+    font-weight: 500;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    margin: 0 0 0.25rem 0;
+}
+
+.action-bar {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    gap: 1rem;
+    margin-bottom: 1.5rem;
+}
+
+.search-input {
+    max-width: 320px;
+}
+
+.table-container {
+    width: 100%;
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    overflow: hidden;
+    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+}
+
+table {
+    width: 100%;
+    border-collapse: collapse;
+    text-align: left;
+    font-size: 0.95rem;
+}
+
+th {
+    background: #111827;
+    color: var(--text-muted);
+    font-weight: 600;
+    padding: 1.25rem 1.5rem;
+    font-size: 0.85rem;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    border-bottom: 1px solid var(--border);
+}
+
+td {
+    padding: 1.25rem 1.5rem;
+    border-bottom: 1px solid var(--border);
+    color: var(--text);
+}
+
+tr:last-child td {
+    border-bottom: none;
+}
+
+tr:hover td {
+    background: rgba(255, 255, 255, 0.02);
+}
+
+#modal {
+    position: fixed;
+    z-index: 100;
+}
+
+@media (max-width: 768px) {
+    .menu-trigger {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        background: none;
+        border: 1px solid var(--border);
+        color: var(--text);
+        padding: 0.5rem;
+        border-radius: 8px;
+        cursor: pointer;
+    }
+
+    #main-nav {
+        display: none;
+        flex-direction: column;
+        position: absolute;
+        top: 4.5rem;
+        left: 0;
+        width: 100%;
+        background: rgba(17, 24, 39, 0.95);
+        backdrop-filter: blur(12px);
+        padding: 1rem;
+        z-index: 1000;
+        border-bottom: 1px solid var(--border);
+    }
+
+    #main-nav.show {
+        display: flex;
+    }
+
+    #main-nav a {
+        padding: 1rem;
+        border-bottom: 1px solid var(--border);
+    }
+
+    #main-nav a:last-child {
+        border-bottom: none;
+    }
+}
+
+@media (min-width: 769px) {
+    .menu-trigger {
+        display: none;
+    }
+}

frontend/assets/css/error404.css

@@ -0,0 +1,14 @@
+/* error404.css */
+.error-code {
+    font-size: 6rem;
+    font-weight: 800;
+    color: var(--accent);
+    margin: 0;
+    line-height: 1;
+}
+
+@media(max-width:768px){
+    .error-code {
+        font-size: 4.5rem;
+    }
+}

frontend/assets/css/home.css

@@ -0,0 +1,16 @@
+/* home.css */
+.brand-title {
+    font-size: 2.25rem !important;
+    font-weight: 800 !important;
+    letter-spacing: -0.04em !important;
+}
+
+.brand-title span {
+    color: var(--accent);
+}
+
+.home-actions {
+    display: flex;
+    flex-direction: column;
+    gap: 0.85rem;
+}

frontend/assets/css/register-blocked.css

@@ -0,0 +1,108 @@
+:root {
+    --bg: #111827;
+    --card: #1f2937;
+    --border: #374151;
+    --text: #f9fafb;
+    --text-muted: #9ca3af;
+    --accent: #3b82f6;
+    --accent-hover: #2563eb;
+    --success: #10b981;
+    --error: #ef4444;
+}
+
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+
+body {
+    min-height: 100vh;
+    background: var(--bg);
+    color: var(--text);
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+    display: flex;
+    flex-direction: column;
+}
+
+body:not(.dashboard-layout) {
+    justify-content: center;
+    align-items: center;
+    padding: 1rem;
+}
+
+.card {
+    width: 100%;
+    max-width: 400px;
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 2.5rem 2rem;
+    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
+    text-align: center;
+}
+
+.card h1 {
+    margin: 0 0 0.5rem 0;
+    font-size: 1.75rem;
+    font-weight: 700;
+    letter-spacing: -0.025em;
+}
+
+.card .subtitle {
+    color: var(--text-muted);
+    font-size: 0.95rem;
+    margin-bottom: 2rem;
+}
+
+.btn {
+    display: inline-flex;
+    justify-content: center;
+    align-items: center;
+    width: 100%;
+    padding: 0.85rem;
+    font-size: 1rem;
+    font-weight: 600;
+    border-radius: 10px;
+    border: none;
+    cursor: pointer;
+    text-decoration: none;
+    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
+}
+
+.btn:active {
+    transform: scale(0.98);
+}
+
+.btn-secondary {
+    background: #1f2937;
+    color: white;
+    border: 1px solid var(--border);
+}
+
+.btn-secondary:hover {
+    background: var(--accent);
+    border-color: var(--accent);
+}
+
+.footer-text {
+    margin-top: 1.5rem;
+    font-size: 0.9rem;
+    color: var(--text-muted);
+}
+
+.message {
+    margin-top: 1.25rem;
+    padding: 0.85rem 1rem;
+    border-radius: 10px;
+    font-size: 0.9rem;
+    line-height: 1.4;
+    text-align: left;
+}
+
+.message.error {
+    background: rgba(239, 68, 68, 0.1);
+    border: 1px solid rgba(239, 68, 68, 0.2);
+    color: var(--error);
+    display: block;
+}

frontend/assets/css/theme.css

@@ -0,0 +1,285 @@
+:root {
+    --bg: #111827;
+    --card: #1f2937;
+    --border: #374151;
+    --text: #f9fafb;
+    --text-muted: #9ca3af;
+    --accent: #3b82f6;
+    --accent-hover: #2563eb;
+    --success: #10b981;
+    --error: #ef4444;
+}
+
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+
+body {
+    min-height: 100vh;
+    background: var(--bg);
+    color: var(--text);
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+    display: flex;
+    flex-direction: column;
+}
+
+body:not(.dashboard-layout) {
+    justify-content: center;
+    align-items: center;
+    padding: 1rem;
+}
+
+.card {
+    width: 100%;
+    max-width: 400px;
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 2.5rem 2rem;
+    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
+    text-align: center;
+}
+
+.card h1 {
+    margin: 0 0 0.5rem 0;
+    font-size: 1.75rem;
+    font-weight: 700;
+    letter-spacing: -0.025em;
+}
+
+.card .subtitle {
+    color: var(--text-muted);
+    font-size: 0.95rem;
+    margin-bottom: 2rem;
+}
+
+.btn {
+    display: inline-flex;
+    justify-content: center;
+    align-items: center;
+    width: 100%;
+    padding: 0.85rem;
+    font-size: 1rem;
+    font-weight: 600;
+    border-radius: 10px;
+    border: none;
+    cursor: pointer;
+    text-decoration: none;
+    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
+}
+
+.btn:active {
+    transform: scale(0.98);
+}
+
+.btn-primary {
+    background: var(--accent);
+    color: white;
+}
+
+.btn-primary:hover {
+    background: var(--accent-hover);
+}
+
+.btn-secondary {
+    background: #1f2937;
+    color: white;
+    border: 1px solid var(--border);
+}
+
+.btn-secondary:hover {
+    background: var(--accent);
+    border-color: var(--accent);
+}
+
+.form-group {
+    margin-bottom: 1.25rem;
+}
+
+.sr-only {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    border: 0;
+}
+
+input {
+    width: 100%;
+    background: #111827;
+    color: white;
+    border: 1px solid var(--border);
+    border-radius: 10px;
+    padding: 0.85rem 1rem;
+    font-size: 1rem;
+    outline: none;
+    transition: border-color 0.15s ease, box-shadow 0.15s ease;
+}
+
+input:focus {
+    border-color: var(--accent);
+    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
+}
+
+input::placeholder {
+    color: #4b5563;
+}
+
+.footer-text {
+    margin-top: 1.5rem;
+    font-size: 0.9rem;
+    color: var(--text-muted);
+}
+
+.footer-text a {
+    color: var(--accent);
+    text-decoration: none;
+}
+
+.footer-text a:hover {
+    text-decoration: underline;
+}
+
+.message {
+    display: none;
+    margin-top: 1.25rem;
+    padding: 0.85rem 1rem;
+    border-radius: 10px;
+    font-size: 0.9rem;
+    line-height: 1.4;
+    text-align: left;
+}
+
+.message.error {
+    background: rgba(239, 68, 68, 0.1);
+    border: 1px solid rgba(239, 68, 68, 0.2);
+    color: var(--error);
+}
+
+.message.success {
+    background: rgba(16, 185, 129, 0.1);
+    border: 1px solid rgba(16, 185, 129, 0.2);
+    color: var(--success);
+}
+
+.modal {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(17, 24, 39, 0.7);
+    backdrop-filter: blur(4px);
+    display: none;
+    justify-content: center;
+    align-items: center;
+    z-index: 1000;
+}
+
+.modal.show {
+    display: flex;
+}
+
+.modal-content {
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 2rem;
+    width: 90%;
+    max-width: 500px;
+    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
+    position: relative;
+    transform: translateY(20px);
+    opacity: 0;
+    animation: modalSlideIn 0.3s forwards ease-out;
+}
+
+@keyframes modalSlideIn {
+    to {
+        transform: translateY(0);
+        opacity: 1;
+    }
+}
+
+.modal-content h2 {
+    margin-top: 0;
+    margin-bottom: 1.5rem;
+    font-size: 1.5rem;
+}
+
+.button-group {
+    display: flex;
+    gap: 1rem;
+    margin-top: 2rem;
+}
+
+.danger-btn {
+    background: rgba(239, 68, 68, 0.1) !important;
+    color: var(--error) !important;
+    border: 1px solid rgba(239, 68, 68, 0.2) !important;
+}
+
+.danger-btn:hover {
+    background: var(--error) !important;
+    color: white !important;
+}
+
+.table-loader {
+    padding: 3rem;
+    text-align: center;
+    color: var(--text-muted);
+}
+
+.modal-split {
+    display: grid;
+    grid-template-columns: 1fr;
+    gap: 2rem;
+    margin-top: 1.5rem;
+}
+
+@media (min-width: 768px) {
+    .modal-split {
+        grid-template-columns: 1fr 1fr;
+    }
+}
+
+.modal-content.large {
+    max-width: 800px;
+}
+
+.inner-table {
+    width: 100%;
+    margin-top: 1rem;
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    overflow: hidden;
+}
+
+.inner-table th, .inner-table td {
+    padding: 0.75rem 1rem;
+    font-size: 0.85rem;
+}
+
+.inner-table th {
+    background: #111827;
+}
+
+.badge {
+    background: rgba(255, 255, 255, 0.05);
+    padding: 0.25rem 0.6rem;
+    border-radius: 999px;
+    font-size: 0.8rem;
+    color: var(--text-muted);
+    border: 1px solid var(--border);
+}
+
+.badge.success {
+    background: rgba(16, 185, 129, 0.1);
+    color: var(--success);
+    border-color: rgba(16, 185, 129, 0.2);
+}

frontend/assets/css/under-construction.css

@@ -0,0 +1,24 @@
+.construction-icon-wrapper {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 80px;
+    height: 80px;
+    background: rgba(59, 130, 246, 0.1); /* Nutzt die var(--accent) Transparenz */
+    border: 1px solid rgba(59, 130, 246, 0.2);
+    border-radius: 50%;
+    margin-bottom: 1.5rem;
+}
+
+.gear-icon {
+    animation: gearRotate 8s linear infinite;
+}
+
+@keyframes gearRotate {
+    0% {
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}

frontend/assets/js/api.js

@@ -0,0 +1,484 @@
+// api.js
+document.addEventListener("DOMContentLoaded", () => {
+    const profileBtn = document.getElementById('profile-btn');
+    const dropdownMenu = document.getElementById('dropdown-menu');
+    const menuBtn = document.getElementById('menu-btn');
+    const mainNav = document.getElementById('main-nav');
+    const logoutBtn = document.getElementById('logout-btn');
+
+    if (profileBtn && dropdownMenu) {
+        profileBtn.addEventListener('click', (e) => {
+            e.stopPropagation();
+            dropdownMenu.classList.toggle('show');
+            if (mainNav) mainNav.classList.remove('show');
+        });
+    }
+
+    if (menuBtn && mainNav) {
+        menuBtn.addEventListener('click', (e) => {
+            e.stopPropagation();
+            e.preventDefault();
+            mainNav.classList.toggle('show');
+            if (dropdownMenu) dropdownMenu.classList.remove('show');
+        });
+    }
+
+    logoutBtn.addEventListener('click', () => {
+        console.log("Logout")
+        localStorage.removeItem('access_token');
+        localStorage.removeItem('refresh_token');
+        document.cookie = "access_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
+        document.cookie = "refresh_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
+    });
+
+    document.addEventListener('click', () => {
+        if (dropdownMenu) dropdownMenu.classList.remove('show');
+        if (mainNav) mainNav.classList.remove('show');
+    });
+
+    if (document.getElementById('items-table-body')) loadItems();
+    if (document.getElementById('locations-table-body')) loadLocations();
+    if (document.getElementById('projects-table-body')) loadProjects();
+
+    loadProfile();
+});
+
+function closeModal(id) {
+    document.getElementById(id).classList.remove('show');
+}
+
+async function apiRequest(endpoint, method = 'GET', body = null) {
+    const options = {
+        method,
+        headers: { 'Content-Type': 'application/json' }
+    };
+    if (body) options.body = JSON.stringify(body);
+
+    try {
+        const response = await fetch(endpoint, options);
+        if (!response.ok && response.status !== 204) {
+            const errText = await response.text();
+            throw new Error(errText || `HTTP Error ${response.status}`);
+        }
+        if (response.status === 204) return null;
+        return await response.json();
+    } catch (err) {
+        alert("Action failed: " + err.message);
+        throw err;
+    }
+}
+
+// ---- ITEMS ----
+async function loadItems() {
+    const data = await apiRequest('/api/item');
+    const tbody = document.getElementById('items-table-body');
+    tbody.innerHTML = '';
+
+    if (!data.items || data.items.length === 0) {
+        tbody.innerHTML = '<tr><td colspan="4" style="text-align: center;">No items found.</td></tr>';
+        return;
+    }
+
+    data.items.forEach(item => {
+        tbody.innerHTML += `
+            <tr>
+                <td style="font-weight: 600;">${item.name}</td>
+                <td><span class="badge">${item.category}</span></td>
+                <td style="font-family: monospace; font-size: 1.05rem;">${item.total_quantity || 0}</td>
+                <td style="text-align: right;">
+                    <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem; border-color: var(--success); color: var(--success);" onclick='openStockModal(${JSON.stringify(item).replace(/'/g, "&#39;")})'>Stock</button>
+                    <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick='editItem(${JSON.stringify(item).replace(/'/g, "&#39;")})'>Edit</button>
+                    <button class="btn btn-secondary danger-btn" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick="deleteItem(${item.id})">Del</button>
+                </td>
+            </tr>
+        `;
+    });
+}
+
+function openItemModal() {
+    document.getElementById('item-form').reset();
+    document.getElementById('item-id').value = '';
+    document.getElementById('item-modal-title').innerText = 'New Item';
+    document.getElementById('item-modal').classList.add('show');
+}
+
+function editItem(item) {
+    document.getElementById('item-id').value = item.id;
+    document.getElementById('item-name').value = item.name;
+    document.getElementById('item-category').value = item.category;
+    document.getElementById('item-desc').value = item.description;
+    //document.getElementById('item-qty').value = item.total_quantity;
+    document.getElementById('item-modal-title').innerText = 'Edit Item';
+    document.getElementById('item-modal').classList.add('show');
+}
+
+async function saveItem(event) {
+    event.preventDefault();
+    const id = document.getElementById('item-id').value;
+    const payload = {
+        name: document.getElementById('item-name').value,
+        category: document.getElementById('item-category').value,
+        description: document.getElementById('item-desc').value,
+        //total_quantity: parseInt(document.getElementById('item-qty').value, 10)
+    };
+
+    const method = id ? 'PUT' : 'POST';
+    const endpoint = id ? `/api/item?id=${id}` : '/api/item';
+
+    await apiRequest(endpoint, method, payload);
+    closeModal('item-modal');
+    loadItems();
+}
+
+async function deleteItem(id) {
+    if (confirm("Are you sure you want to delete this item?")) {
+        await apiRequest(`/api/item?id=${id}`, 'DELETE');
+        loadItems();
+    }
+}
+
+// ---- LOCATIONS ----
+async function loadLocations() {
+    const data = await apiRequest('/api/location');
+    const tbody = document.getElementById('locations-table-body');
+    tbody.innerHTML = '';
+
+    if (!data.locations || data.locations.length === 0) {
+        tbody.innerHTML = '<tr><td colspan="2" style="text-align: center;">No locations found.</td></tr>';
+        return;
+    }
+
+    data.locations.forEach(loc => {
+        tbody.innerHTML += `
+            <tr>
+                <td style="font-weight: 600;">${loc.name}</td>
+                <td style="text-align: right;">
+                    <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick="editLocation(${loc.id}, '${loc.name}')">Edit</button>
+                    <button class="btn btn-secondary danger-btn" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick="deleteLocation(${loc.id})">Delete</button>
+                </td>
+            </tr>
+        `;
+    });
+}
+
+function openLocationModal() {
+    document.getElementById('location-form').reset();
+    document.getElementById('location-id').value = '';
+    document.getElementById('location-modal-title').innerText = 'New Location';
+    document.getElementById('location-modal').classList.add('show');
+}
+
+function editLocation(id, name) {
+    document.getElementById('location-id').value = id;
+    document.getElementById('location-name').value = name;
+    document.getElementById('location-modal-title').innerText = 'Edit Location';
+    document.getElementById('location-modal').classList.add('show');
+}
+
+async function saveLocation(event) {
+    event.preventDefault();
+    const id = document.getElementById('location-id').value;
+    const payload = { name: document.getElementById('location-name').value };
+
+    const method = id ? 'PUT' : 'POST';
+    const endpoint = id ? `/api/location?id=${id}` : '/api/location';
+
+    await apiRequest(endpoint, method, payload);
+    closeModal('location-modal');
+    loadLocations();
+}
+
+async function deleteLocation(id) {
+    if (confirm("Are you sure you want to delete this location?")) {
+        await apiRequest(`/api/location?id=${id}`, 'DELETE');
+        loadLocations();
+    }
+}
+
+// ---- PROJECTS ----
+async function loadProjects() {
+    const data = await apiRequest('/api/project');
+    const tbody = document.getElementById('projects-table-body');
+    tbody.innerHTML = '';
+
+    if (!data.projects || data.projects.length === 0) {
+        tbody.innerHTML = '<tr><td colspan="3" style="text-align: center;">No projects found.</td></tr>';
+        return;
+    }
+
+    data.projects.forEach(proj => {
+        tbody.innerHTML += `
+            <tr>
+                <td style="font-weight: 600;">${proj.name}</td>
+                <td style="color: var(--text-muted);">${proj.description}</td>
+                <td style="text-align: right;">
+                    <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem; border-color: var(--accent); color: var(--accent);" onclick='openAssociationModal(${JSON.stringify(proj).replace(/'/g, "&#39;")})'>Items</button>
+                    <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick='editProject(${JSON.stringify(proj).replace(/'/g, "&#39;")})'>Edit</button>
+                    <button class="btn btn-secondary danger-btn" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;" onclick="deleteProject(${proj.id})">Del</button>
+                </td>
+            </tr>
+        `;
+    });
+}
+
+function openProjectModal() {
+    document.getElementById('project-form').reset();
+    document.getElementById('project-id').value = '';
+    document.getElementById('project-modal-title').innerText = 'New Project';
+    document.getElementById('project-modal').classList.add('show');
+}
+
+function editProject(proj) {
+    document.getElementById('project-id').value = proj.id;
+    document.getElementById('project-name').value = proj.name;
+    document.getElementById('project-desc').value = proj.description;
+    document.getElementById('project-modal-title').innerText = 'Edit Project';
+    document.getElementById('project-modal').classList.add('show');
+}
+
+async function saveProject(event) {
+    event.preventDefault();
+    const id = document.getElementById('project-id').value;
+    const payload = {
+        name: document.getElementById('project-name').value,
+        description: document.getElementById('project-desc').value
+    };
+
+    const method = id ? 'PUT' : 'POST';
+    const endpoint = id ? `/api/project?id=${id}` : '/api/project';
+
+    await apiRequest(endpoint, method, payload);
+    closeModal('project-modal');
+    loadProjects();
+}
+
+async function deleteProject(id) {
+    if (confirm("Are you sure you want to delete this project?")) {
+        await apiRequest(`/api/project?id=${id}`, 'DELETE');
+        loadProjects();
+    }
+}
+
+// ---- STOCK ----
+async function openStockModal(item) {
+    document.getElementById('stock-modal-title').innerText = `Stock: ${item.name}`;
+    document.getElementById('stock-item-id').value = item.id;
+    document.getElementById('stock-qty').value = '';
+    document.getElementById('stock-modal').classList.add('show');
+
+    await reloadStockTable(item.id);
+
+    const locData = await apiRequest('/api/location');
+    const locSelect = document.getElementById('stock-location');
+    locSelect.innerHTML = '<option value="">Select Location...</option>';
+    if (locData.locations) {
+        locData.locations.forEach(loc => {
+            locSelect.innerHTML += `<option value="${loc.id}">${loc.name}</option>`;
+        });
+    }
+}
+
+async function reloadStockTable(itemId) {
+    const tbody = document.getElementById('stock-table-body');
+    tbody.innerHTML = '<tr><td colspan="3" style="text-align:center;">Loading...</td></tr>';
+
+    try {
+        const data = await apiRequest(`/api/stock?item_id=${itemId}`);
+        tbody.innerHTML = '';
+        if (!data.stock || data.stock.length === 0) {
+            tbody.innerHTML = '<tr><td colspan="3" style="text-align: center;">No stock entries.</td></tr>';
+            return;
+        }
+
+        for (const st of data.stock) {
+            const locData = await apiRequest(`/api/location?id=${st.location_id}`);
+            tbody.innerHTML += `
+                <tr>
+                    <td>${locData.name || `Location #${st.location_id}`}</td>
+                    <td><span class="badge success">${st.quantity}</span></td>
+                    <td style="text-align: right;">
+                        <button class="btn btn-secondary danger-btn" style="padding: 0.2rem 0.5rem; font-size: 0.75rem;" onclick="deleteStock(${st.id}, ${itemId})">Del</button>
+                    </td>
+                </tr>
+            `;
+        }
+    } catch (e) {
+        tbody.innerHTML = '<tr><td colspan="3" style="text-align: center;">Failed to load.</td></tr>';
+    }
+}
+
+async function saveStock(event) {
+    event.preventDefault();
+    const itemId = document.getElementById('stock-item-id').value;
+    const payload = {
+        item_id: parseInt(itemId, 10),
+        location_id: parseInt(document.getElementById('stock-location').value, 10),
+        quantity: parseInt(document.getElementById('stock-qty').value, 10)
+    };
+
+    await apiRequest('/api/stock', 'POST', payload);
+    document.getElementById('stock-qty').value = '';
+    await reloadStockTable(itemId);
+    loadItems();
+}
+
+async function deleteStock(stockId, itemId) {
+    if (confirm("Remove this stock entry?")) {
+        await apiRequest(`/api/stock?id=${stockId}`, 'DELETE');
+        await reloadStockTable(itemId);
+        loadItems();
+    }
+}
+
+// ---- ASSOCIATIONS ----
+async function openAssociationModal(project) {
+    document.getElementById('association-modal-title').innerText = `Items for: ${project.name}`;
+    document.getElementById('assoc-project-id').value = project.id;
+    document.getElementById('assoc-qty').value = '';
+    document.getElementById('association-modal').classList.add('show');
+
+    await reloadAssociationTable(project.id);
+
+    const itemData = await apiRequest('/api/item');
+    const itemSelect = document.getElementById('assoc-item');
+    itemSelect.innerHTML = '<option value="">Select Item...</option>';
+    if (itemData.items) {
+        itemData.items.forEach(it => {
+            itemSelect.innerHTML += `<option value="${it.id}">${it.name} (Avail: ${it.total_quantity})</option>`;
+        });
+    }
+}
+
+async function reloadAssociationTable(projectId) {
+    const tbody = document.getElementById('association-table-body');
+    tbody.innerHTML = '<tr><td colspan="3" style="text-align:center;">Loading...</td></tr>';
+
+    try {
+        const data = await apiRequest(`/api/association?project_id=${projectId}`);
+        tbody.innerHTML = '';
+        if (!data.associations || data.associations.length === 0) {
+            tbody.innerHTML = '<tr><td colspan="3" style="text-align: center;">No allocated items.</td></tr>';
+            return;
+        }
+
+        for (const asc of data.associations) {
+            const itemData = await apiRequest(`/api/item?id=${asc.item_id}`);
+            console.log(itemData)
+            tbody.innerHTML += `
+                <tr>
+                    <td>${itemData.name || `Item #${asc.item_id}`}</td>
+                    <td><span class="badge success">${asc.quantity}</span></td>
+                    <td style="text-align: right;">
+                        <button class="btn btn-secondary danger-btn" style="padding: 0.2rem 0.5rem; font-size: 0.75rem;" onclick="deleteAssociation(${asc.id}, ${projectId})">Del</button>
+                    </td>
+                </tr>
+            `;
+        }
+    } catch (e) {
+        tbody.innerHTML = '<tr><td colspan="3" style="text-align: center;">Failed to load.</td></tr>';
+    }
+}
+
+async function saveAssociation(event) {
+    event.preventDefault();
+    const projectId = document.getElementById('assoc-project-id').value;
+    const payload = {
+        project_id: parseInt(projectId, 10),
+        item_id: parseInt(document.getElementById('assoc-item').value, 10),
+        quantity: parseInt(document.getElementById('assoc-qty').value, 10)
+    };
+
+    await apiRequest('/api/association', 'POST', payload);
+    document.getElementById('assoc-qty').value = '';
+    await reloadAssociationTable(projectId);
+}
+
+async function deleteAssociation(assocId, projectId) {
+    if (confirm("Remove this item from the project?")) {
+        await apiRequest(`/api/association?id=${assocId}`, 'DELETE');
+        await reloadAssociationTable(projectId);
+    }
+}
+
+async function handleDashboardView() {
+    const locTbody = document.getElementById('dash-locations-body');
+    const projTbody = document.getElementById('dash-projects-body');
+    if (!locTbody && !projTbody) return;
+
+    try {
+        const locData = await apiRequest('/api/location');
+        if (locTbody && locData && locData.locations) {
+            locTbody.innerHTML = '';
+            if (locData.locations.length === 0) {
+                locTbody.innerHTML = '<tr><td style="color: var(--text-muted); padding: 1rem;">No locations found.</td></tr>';
+            } else {
+                locData.locations.forEach(loc => {
+                    const tr = document.createElement('tr');
+                    tr.innerHTML = `<td style="cursor: pointer; color: var(--accent); font-weight: 500; padding: 0.75rem 1rem;">${loc.name}</td>`;
+                    tr.onclick = () => openDashboardModal(`/api/location?id=${loc.id}&content=true`, `Items in ${loc.name}`, 'contents');
+                    locTbody.appendChild(tr);
+                });
+            }
+        }
+
+        const projData = await apiRequest('/api/project');
+        if (projTbody && projData && projData.projects) {
+            projTbody.innerHTML = '';
+            if (projData.projects.length === 0) {
+                projTbody.innerHTML = '<tr><td style="color: var(--text-muted); padding: 1rem;">No projects found.</td></tr>';
+            } else {
+                projData.projects.forEach(p => {
+                    const tr = document.createElement('tr');
+                    tr.innerHTML = `<td style="cursor: pointer; color: var(--accent); font-weight: 500; padding: 0.75rem 1rem;">${p.name}</td>`;
+                    tr.onclick = () => openDashboardModal(`/api/project?id=${p.id}&details=true`, `Items assigned to ${p.name}`, 'items');
+                    projTbody.appendChild(tr);
+                });
+            }
+        }
+    } catch (err) {
+        console.error(err);
+    }
+}
+
+async function openDashboardModal(url, title, dataKey) {
+    document.getElementById('dash-modal-title').innerText = title;
+    const tbody = document.getElementById('dash-modal-body');
+    if (!tbody) return;
+    tbody.innerHTML = '<tr><td colspan="2" style="text-align:center; padding:1.5rem; color:var(--text-muted);">Loading...</td></tr>';
+    document.getElementById('dash-details-modal').classList.add('show');
+
+    try {
+        const data = await apiRequest(url);
+        tbody.innerHTML = '';
+        const list = data[dataKey] || [];
+        if (list.length === 0) {
+            tbody.innerHTML = '<tr><td colspan="2" style="color:var(--text-muted); text-align:center; padding:1.5rem;">No active items found.</td></tr>';
+            return;
+        }
+        list.forEach(i => {
+            tbody.innerHTML += `
+                <tr>
+                    <td style="color:var(--text); padding:0.75rem 1rem;">${i.item_name}</td>
+                    <td style="text-align:right; padding:0.75rem 1rem;"><span class="badge success">${i.quantity}</span></td>
+                </tr>
+            `;
+        });
+    } catch (e) {
+        tbody.innerHTML = '<tr><td colspan="2" style="color:var(--error); text-align:center; padding:1.5rem;">Failed to load data.</td></tr>';
+    }
+}
+
+// ---- PROFILE ----
+async function loadProfile() {
+    const avatar = document.getElementById("avatar");
+    const username = document.getElementById('username');
+
+    try {
+        const data = await apiRequest('/api/profile');
+
+        avatar.innerText = data.username[0].toLocaleUpperCase();
+        username.innerText = data.username;
+    } catch (e) {
+        username.innerHTML = '<tr><td colspan="2" style="color:var(--error); text-align:center; padding:1.5rem;">Failed to load data.</td></tr>';
+    }
+}

frontend/assets/js/auth.js

@@ -0,0 +1,128 @@
+// auth.js
+(() => {
+    const currentPath = window.location.pathname;
+
+    if (currentPath !== "/" && currentPath !== "/login" && currentPath !== "/register") {
+        return;
+    }
+
+    function getCookie(name) {
+        const value = `; ${document.cookie}`;
+        const parts = value.split(`; ${name}=`);
+        if (parts.length === 2) return parts.pop().split(';').shift();
+        return null;
+    }
+
+    function clearAllAuth() {
+        console.log("Clearing all auth remnants from everywhere...");
+        localStorage.removeItem("access_token");
+        localStorage.removeItem("refresh_token");
+        sessionStorage.removeItem("is_refreshing");
+        document.cookie = "access_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC; Secure; SameSite=Lax;";
+        document.cookie = "refresh_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC; Secure; SameSite=Lax;";
+    }
+
+    async function tryTokenRefresh(refreshToken) {
+        if (!refreshToken) return false;
+
+        try {
+            console.log("Sending refresh token to /api/refresh...");
+            const response = await fetch("/api/refresh", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ refresh_token: refreshToken })
+            });
+
+            if (response.ok) {
+                const data = await response.json();
+                localStorage.setItem("access_token", data.access_token);
+                localStorage.setItem("refresh_token", data.refresh_token);
+                document.cookie = `access_token=${data.access_token}; path=/; max-age=900; SameSite=Lax; Secure`;
+                document.cookie = `refresh_token=${data.refresh_token}; path=/; max-age=604800; SameSite=Lax; Secure`;
+                return true;
+            }
+        } catch (err) {
+            console.error("Refresh request failed:", err);
+        }
+
+        return false;
+    }
+
+    async function checkAuth() {
+        const cookieAccessToken = getCookie("access_token");
+        const cookieRefreshToken = getCookie("refresh_token");
+        const localAccessToken = localStorage.getItem("access_token");
+        const localRefreshToken = localStorage.getItem("refresh_token");
+
+        const accessToken = cookieAccessToken || localAccessToken;
+        const refreshToken = cookieRefreshToken || localRefreshToken;
+
+        console.log("Auth check started...");
+        console.log("AccessToken available (Cookie/Local):", !!cookieAccessToken, "/", !!localAccessToken);
+        console.log("RefreshToken available (Cookie/Local):", !!cookieRefreshToken, "/", !!localRefreshToken);
+
+        if (!accessToken && !refreshToken) {
+            console.log("No tokens found in cookies or localStorage. User is a guest.");
+            return;
+        }
+
+        if (accessToken) {
+            try {
+                console.log("Validating token against /api/userinfo...");
+
+                const response = await fetch("/api/userinfo", {
+                    method: "GET",
+                    headers: { "Authorization": `Bearer ${accessToken}` }
+                });
+
+                if (response.ok) {
+                    console.log("Token is perfectly valid!");
+                    sessionStorage.removeItem("is_refreshing");
+
+                    if (!cookieAccessToken) {
+                        document.cookie = `access_token=${accessToken}; path=/; max-age=900; SameSite=Lax; Secure`;
+                    }
+                    if (!cookieRefreshToken && localRefreshToken) {
+                        document.cookie = `refresh_token=${localRefreshToken}; path=/; max-age=604800; SameSite=Lax; Secure`;
+                    }
+
+                    console.log("Redirecting to dashboard...");
+                    window.location.href = "/dashboard";
+                    return;
+                } else {
+                    console.log("Token rejected by /api/userinfo. Status:", response.status);
+                }
+            } catch (err) {
+                console.error("Network error during token verification:", err);
+            }
+        }
+
+        if (sessionStorage.getItem("is_refreshing") === "true") {
+            console.warn("Loop protection triggered! Tokens appear to be corrupt. Clearing storage.");
+            clearAllAuth();
+            return;
+        }
+
+        if (refreshToken) {
+            console.log("Access token has expired. Starting refresh process...");
+            sessionStorage.setItem("is_refreshing", "true");
+
+            const refreshSuccessful = await tryTokenRefresh(refreshToken);
+
+            if (refreshSuccessful) {
+                console.log("Refresh successful! Reloading page to apply cookies...");
+                window.location.reload();
+                return;
+            } else {
+                console.log("Refresh failed. Refresh token has also expired.");
+            }
+        } else {
+            console.log("No refresh token available for recovery.");
+        }
+
+        clearAllAuth();
+        console.log("Authentication completely failed. User remains on login page.");
+    }
+
+    setTimeout(checkAuth, 50);
+})();

frontend/assets/js/login.js

@@ -0,0 +1,42 @@
+// login.js
+document.addEventListener("DOMContentLoaded", () => {
+    const form = document.getElementById("login-form");
+    const errorBox = document.getElementById("error");
+
+    if (!form) return;
+
+    form.addEventListener("submit", async (e) => {
+        e.preventDefault();
+        errorBox.style.display = "none";
+
+        const username = document.getElementById("username").value;
+        const password = document.getElementById("password").value;
+
+        try {
+            const response = await fetch("/api/login", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ username, password })
+            });
+
+            if (!response.ok) {
+                const text = await response.text();
+                throw new Error(text);
+            }
+
+            const data = await response.json();
+
+            localStorage.setItem("access_token", data.access_token);
+            localStorage.setItem("refresh_token", data.refresh_token);
+
+            document.cookie = `access_token=${data.access_token}; path=/; max-age=900; SameSite=Lax; Secure`;
+            document.cookie = `refresh_token=${data.refresh_token}; path=/; max-age=604800; SameSite=Lax; Secure`;
+
+            window.location.href = "/dashboard";
+
+        } catch (err) {
+            errorBox.textContent = err.message || "Login failed.";
+            errorBox.style.display = "block";
+        }
+    });
+});

frontend/assets/js/register.js

@@ -0,0 +1,43 @@
+// register.js
+document.addEventListener("DOMContentLoaded", () => {
+    const form = document.getElementById("register-form");
+    const msgBox = document.getElementById("message");
+
+    form.addEventListener("submit", async (e) => {
+        e.preventDefault();
+
+        msgBox.style.display = "none";
+        msgBox.className = "message";
+
+        const username = document.getElementById("username").value;
+        const password = document.getElementById("password").value;
+
+        try {
+            const response = await fetch("/api/register", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ username, password })
+            });
+
+            if (!response.ok) {
+                const text = await response.text();
+                throw new Error(text);
+            }
+
+            msgBox.textContent = "Registration successful! Redirecting...";
+            msgBox.classList.add("success");
+            msgBox.style.display = "block";
+
+            form.querySelector("button").disabled = true;
+
+            setTimeout(() => {
+                window.location.href = "/login";
+            }, 1500);
+
+        } catch (err) {
+            msgBox.textContent = err.message;
+            msgBox.classList.add("error");
+            msgBox.style.display = "block";
+        }
+    });
+});

frontend/handler.go

@@ -3,17 +3,168 @@ package frontend
 import (
 	"html/template"
 	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/tdewolff/minify/v2"
+	"github.com/tdewolff/minify/v2/css"
+	"github.com/tdewolff/minify/v2/js"
 )
 
+var dashboard = template.Must(template.ParseFiles(
+	"frontend/htmx/contents/dash/base.html",
+	"frontend/htmx/contents/dash/dashboard.html"))
+
+var inventory = template.Must(template.ParseFiles(
+	"frontend/htmx/contents/dash/base.html",
+	"frontend/htmx/contents/dash/inventory.html"))
+
+var item = template.Must(template.ParseFiles(
+	"frontend/htmx/contents/dash/base.html",
+	"frontend/htmx/contents/dash/itemlist.html"))
+
+var locations = template.Must(template.ParseFiles(
+	"frontend/htmx/contents/dash/base.html",
+	"frontend/htmx/contents/dash/locations.html"))
+
+var projects = template.Must(template.ParseFiles(
+	"frontend/htmx/contents/dash/base.html",
+	"frontend/htmx/contents/dash/projects.html"))
+
+var home = template.Must(template.ParseFiles("frontend/htmx/home.html"))
+
 func Home(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != "/" {
+		http.ServeFile(w, r, "frontend/htmx/404.html")
+		return
+	}
+
 	w.Header().Set("Content-Type", "text/html")
-	var tmpl = template.Must(template.ParseFiles("frontend/htmx/home.html"))
+	err := home.Execute(w, struct {
-	err := tmpl.Execute(w, struct {
 		Name string
 	}{
-		Name: "Miau",
+		Name: "Home",
 	})
 	if err != nil {
 		return
 	}
 }
+
+func Dashboard(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	err := dashboard.ExecuteTemplate(w, "base.html", struct {
+		Title string
+		Stats struct {
+			Items     int
+			Projects  int
+			Locations int
+		}
+	}{
+		Title: "Dashboard",
+		Stats: struct {
+			Items     int
+			Projects  int
+			Locations int
+		}{
+			Items:     1,
+			Projects:  1,
+			Locations: 3,
+		},
+	})
+	if err != nil {
+		return
+	}
+}
+func Inventory(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	err := inventory.ExecuteTemplate(w, "base.html", struct {
+		Title string
+	}{
+		Title: "Inventory",
+	})
+	if err != nil {
+		return
+	}
+}
+func Items(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	err := item.ExecuteTemplate(w, "base.html", struct {
+		Title string
+	}{
+		Title: "Items",
+	})
+	if err != nil {
+		return
+	}
+}
+func Locations(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	err := locations.ExecuteTemplate(w, "base.html", struct {
+		Title string
+	}{
+		Title: "Locations",
+	})
+	if err != nil {
+		return
+	}
+}
+func Projects(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html")
+	err := projects.ExecuteTemplate(w, "base.html", struct {
+		Title string
+	}{
+		Title: "Projects",
+	})
+	if err != nil {
+		return
+	}
+}
+
+var minifier *minify.M
+
+func init() {
+	minifier = minify.New()
+	// Füge die Minifier für CSS und JS hinzu
+	minifier.AddFunc("text/css", css.Minify)
+	minifier.AddFunc("text/javascript", js.Minify)
+}
+
+func Assets(w http.ResponseWriter, r *http.Request) {
+	path := strings.TrimPrefix(r.URL.Path, "/assets/")
+	fullPath := filepath.Join("frontend/assets", path)
+
+	w.Header().Set("Cache-Control", "public, max-age=3600")
+
+	var mimeType string
+	if strings.HasSuffix(path, ".min.js") {
+		mimeType = "text/javascript"
+		fullPath = strings.Replace(fullPath, ".min.js", ".js", 1)
+	} else if strings.HasSuffix(path, ".min.css") {
+		mimeType = "text/css"
+		fullPath = strings.Replace(fullPath, ".min.css", ".css", 1)
+	}
+
+	info, err := os.Stat(fullPath)
+	if err != nil || info.IsDir() {
+		http.Error(w, "Asset not found", http.StatusNotFound)
+		return
+	}
+
+	if mimeType != "" {
+		content, err := os.ReadFile(fullPath)
+		if err != nil {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+
+		minifiedContent, err := minifier.Bytes(mimeType, content)
+		if err == nil {
+			w.Header().Set("Content-Type", mimeType)
+			w.Write(minifiedContent)
+			return
+		}
+	}
+
+	http.ServeFile(w, r, fullPath)
+}

frontend/htmx/404.html

@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>404 - Page Not Found | MiauInv</title>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/error404.min.css">
+</head>
+<body>
+
+<main class="card">
+    <div class="error-code">404</div>
+    <h1>Page Not Found</h1>
+    <p class="subtitle" style="margin-bottom: 2rem;">The page you are looking for does not exist or has been moved to another address.</p>
+
+    <a href="/dashboard" class="btn btn-secondary">
+        Back to Dashboard
+    </a>
+</main>
+
+</body>
+</html>

frontend/htmx/contents/dash/base.html

@@ -0,0 +1,57 @@
+{{ define "base.html" }}
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{ .Title }} | MiauInv</title>
+    <script src="https://unpkg.com/htmx.org@2.0.4"></script>
+    <script src="/assets/js/api.min.js"></script>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/dashboard.min.css">
+</head>
+<body class="dashboard-layout">
+
+<header>
+    <div class="nav-container">
+        <div class="nav-left">
+            <div class="brand">Miau<span>Inv</span></div>
+
+            <button class="menu-trigger" id="menu-btn" aria-label="Menu">
+                <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="3" y1="12" x2="21" y2="12"></line><line x1="3" y1="6" x2="21" y2="6"></line><line x1="3" y1="18" x2="21" y2="18"></line></svg>
+            </button>
+
+            <nav id="main-nav">
+                <a href="/dashboard">Dashboard</a>
+                <a href="/inventory">Inventory</a>
+                <a href="/projects">Projects</a>
+                <a href="/locations">Locations</a>
+            </nav>
+        </div>
+
+        <div class="profile-dropdown">
+            <button class="profile-trigger" id="profile-btn">
+                <div id="avatar" class="avatar">M</div>
+                <span id="username" class="username">Loading...</span>
+                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"></polyline></svg>
+            </button>
+            <div class="dropdown-menu" id="dropdown-menu">
+                <a href="/profile/settings">Account Settings</a>
+                <a href="/profile/activity">Activity Log</a>
+                <hr class="dropdown-divider">
+                <button id="logout-btn" class="logout-btn"
+                        hx-post="/api/logout"
+                        hx-on::after-request="window.location.href='/login'">
+                    Log Out
+                </button>
+            </div>
+        </div>
+    </div>
+</header>
+
+<main>
+    {{ template "content" . }}
+</main>
+
+</body>
+</html>
+{{ end }}

frontend/htmx/contents/dash/dashboard.html

@@ -0,0 +1,110 @@
+{{ define "content" }}
+<div class="page-header">
+    <h1>Dashboard Overview</h1>
+</div>
+
+<div class="stats-grid" style="margin-bottom: 2rem; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem;">
+    <div class="stat-card" style="background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; display: flex; align-items: center; gap: 1rem;">
+        <div class="stat-icon" style="background: rgba(59, 130, 246, 0.1); color: var(--accent); padding: 0.75rem; border-radius: 10px; display: flex; align-items: center; justify-content: center;">
+            <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 2 7 12 12 22 7 12 2"></polygon><polyline points="2 17 12 22 22 17"></polyline><polyline points="2 12 12 17 22 12"></polyline></svg>
+        </div>
+        <div class="stat-info">
+            <p style="color: var(--text-muted); font-size: 0.9rem; margin: 0;">Total Items</p>
+            <h2 style="font-size: 1.5rem; font-weight: 700; margin: 0;">
+                {{ if .Stats }}{{ .Stats.Items }}{{ else }}0{{ end }}
+            </h2>
+        </div>
+    </div>
+
+    <div class="stat-card" style="background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; display: flex; align-items: center; gap: 1rem;">
+        <div class="stat-icon" style="background: rgba(16, 185, 129, 0.1); color: var(--success); padding: 0.75rem; border-radius: 10px; display: flex; align-items: center; justify-content: center;">
+            <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"></path></svg>
+        </div>
+        <div class="stat-info">
+            <p style="color: var(--text-muted); font-size: 0.9rem; margin: 0;">Active Projects</p>
+            <h2 style="font-size: 1.5rem; font-weight: 700; margin: 0;">
+                {{ if .Stats }}{{ .Stats.Projects }}{{ else }}0{{ end }}
+            </h2>
+        </div>
+    </div>
+
+    <div class="stat-card" style="background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; display: flex; align-items: center; gap: 1rem;">
+        <div class="stat-icon" style="background: rgba(245, 158, 11, 0.1); color: #f59e0b; padding: 0.75rem; border-radius: 10px; display: flex; align-items: center; justify-content: center;">
+            <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z"></path><circle cx="12" cy="10" r="3"></circle></svg>
+        </div>
+        <div class="stat-info">
+            <p style="color: var(--text-muted); font-size: 0.9rem; margin: 0;">Locations</p>
+            <h2 style="font-size: 1.5rem; font-weight: 700; margin: 0;">
+                {{ if .Stats }}{{ .Stats.Locations }}{{ else }}0{{ end }}
+            </h2>
+        </div>
+    </div>
+</div>
+
+<div class="modal-split">
+    <div class="card" style="max-width: 100%; text-align: left; padding: 1.5rem;">
+        <h2 style="font-size: 1.25rem; margin-bottom: 1rem; color: var(--text);">Locations</h2>
+        <div class="table-container">
+            <table class="inner-table" style="margin-top: 0; border-radius: 8px; width: 100%;">
+                <thead>
+                <tr>
+                    <th style="text-align: left; padding: 0.75rem 1rem; background: #111827;">Name</th>
+                </tr>
+                </thead>
+                <tbody id="dash-locations-body">
+                <tr><td class="table-loader" style="padding: 1.5rem; text-align: center; color: var(--text-muted);">Loading locations...</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </div>
+
+    <div class="card" style="max-width: 100%; text-align: left; padding: 1.5rem;">
+        <h2 style="font-size: 1.25rem; margin-bottom: 1rem; color: var(--text);">Active Projects</h2>
+        <div class="table-container">
+            <table class="inner-table" style="margin-top: 0; border-radius: 8px; width: 100%;">
+                <thead>
+                <tr>
+                    <th style="text-align: left; padding: 0.75rem 1rem; background: #111827;">Project Name</th>
+                </tr>
+                </thead>
+                <tbody id="dash-projects-body">
+                <tr><td class="table-loader" style="padding: 1.5rem; text-align: center; color: var(--text-muted);">Loading projects...</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </div>
+</div>
+
+<div id="dash-details-modal" class="modal">
+    <div class="modal-content">
+        <h2 id="dash-modal-title">Details</h2>
+        <div class="table-container">
+            <table class="inner-table" style="width: 100%;">
+                <thead>
+                <tr>
+                    <th style="text-align: left; padding: 0.75rem 1rem;">Item</th>
+                    <th style="text-align: right; width: 100px; padding: 0.75rem 1rem;">Quantity</th>
+                </tr>
+                </thead>
+                <tbody id="dash-modal-body"></tbody>
+            </table>
+        </div>
+        <div class="button-group">
+            <button type="button" class="btn btn-secondary" onclick="document.getElementById('dash-details-modal').classList.remove('show')">Close</button>
+        </div>
+    </div>
+</div>
+
+<script>
+    if (typeof handleDashboardView === "function") {
+        handleDashboardView();
+    }
+    if (window.htmx) {
+        htmx.on("htmx:afterOnLoad", function() {
+            if (typeof handleDashboardView === "function") {
+                handleDashboardView();
+            }
+        });
+    }
+</script>
+{{ end }}

frontend/htmx/contents/dash/inventory.html

@@ -0,0 +1,88 @@
+{{ define "content" }}
+<div class="page-header action-bar">
+    <h1>Inventory</h1>
+    <button class="btn btn-primary" style="width: auto; padding: 0.6rem 1.2rem; font-size: 0.95rem;" onclick="openItemModal()">
+        Add Item
+    </button>
+</div>
+
+<div class="table-container">
+    <table>
+        <thead>
+        <tr>
+            <th>Name</th>
+            <th>Category</th>
+            <th>Total Quantity</th>
+            <th style="text-align: right;">Actions</th>
+        </tr>
+        </thead>
+        <tbody id="items-table-body">
+        <tr><td colspan="4" class="table-loader">Loading inventory...</td></tr>
+        </tbody>
+    </table>
+</div>
+
+<div id="item-modal" class="modal">
+    <div class="modal-content">
+        <h2 id="item-modal-title">New Item</h2>
+        <form id="item-form" onsubmit="saveItem(event)">
+            <input type="hidden" id="item-id">
+            <div class="form-group">
+                <input type="text" id="item-name" placeholder="Item Name" required>
+            </div>
+            <div class="form-group">
+                <input type="text" id="item-category" placeholder="Category" required>
+            </div>
+            <div class="form-group">
+                <input type="text" id="item-desc" placeholder="Description">
+            </div>
+            <div class="button-group">
+                <button type="submit" class="btn btn-primary">Save Item</button>
+                <button type="button" class="btn btn-secondary" onclick="closeModal('item-modal')">Cancel</button>
+            </div>
+        </form>
+    </div>
+</div>
+
+<div id="stock-modal" class="modal">
+    <div class="modal-content large">
+        <h2 id="stock-modal-title">Manage Stock</h2>
+        <div class="modal-split">
+            <div>
+                <h3>Current Locations</h3>
+                <div class="inner-table">
+                    <table>
+                        <thead>
+                        <tr>
+                            <th>Location</th>
+                            <th>Quantity</th>
+                            <th></th>
+                        </tr>
+                        </thead>
+                        <tbody id="stock-table-body">
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+            <div>
+                <h3>Update Stock</h3>
+                <form id="stock-form" onsubmit="saveStock(event)" style="margin-top: 1rem;">
+                    <input type="hidden" id="stock-item-id">
+                    <div class="form-group">
+                        <select id="stock-location" class="search-input" style="width: 100%; padding: 0.85rem 1rem; background: #111827; color: white; border: 1px solid var(--border); border-radius: 10px;" required>
+                            <option value="">Select Location...</option>
+                        </select>
+                    </div>
+                    <div class="form-group">
+                        <input type="number" id="stock-qty" placeholder="Quantity to add/set" required>
+                    </div>
+                    <div class="button-group">
+                        <button type="submit" class="btn btn-primary">Update Stock</button>
+                        <button type="button" class="btn btn-secondary" onclick="closeModal('stock-modal')">Done</button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+</div>
+{{ end }}

frontend/htmx/contents/dash/itemlist.html

@@ -0,0 +1,28 @@
+<table>
+    <thead>
+    <tr>
+        <th>Name</th>
+        <th>Category</th>
+        <th>Total</th>
+        <th>Free</th>
+        <th style="text-align: right;">Actions</th>
+    </tr>
+    </thead>
+    <tbody>
+    {{ range . }}
+    <tr>
+        <td style="font-weight: 600;">{{ .Name }}</td>
+        <td>
+            <span style="background: rgba(255,255,255,0.05); padding: 0.25rem 0.6rem; border-radius: 999px; font-size: 0.8rem; color: var(--text-muted); border: 1px solid var(--border);">
+                {{ .Category }}
+            </span>
+        </td>
+        <td style="font-family: monospace; font-size: 1.05rem;">{{ .TotalQuantity }}</td>
+        <td style="font-family: monospace; font-size: 1.05rem; color: var(--success);">{{ .FreeQuantity }}</td>
+        <td style="text-align: right;">
+            <button class="btn btn-secondary" style="width: auto; padding: 0.4rem 0.8rem; font-size: 0.85rem;">Edit</button>
+        </td>
+    </tr>
+    {{ end }}
+    </tbody>
+</table>

frontend/htmx/contents/dash/locations.html

@@ -0,0 +1,38 @@
+{{ define "content" }}
+<div class="page-header action-bar">
+    <h1>Locations</h1>
+    <button class="btn btn-primary" style="width: auto; padding: 0.6rem 1.2rem; font-size: 0.95rem;" onclick="openLocationModal()">
+        Add Location
+    </button>
+</div>
+
+<div class="table-container">
+    <table>
+        <thead>
+        <tr>
+            <th>Name</th>
+            <th style="text-align: right;">Actions</th>
+        </tr>
+        </thead>
+        <tbody id="locations-table-body">
+        <tr><td colspan="2" class="table-loader">Loading locations...</td></tr>
+        </tbody>
+    </table>
+</div>
+
+<div id="location-modal" class="modal">
+    <div class="modal-content">
+        <h2 id="location-modal-title">New Location</h2>
+        <form id="location-form" onsubmit="saveLocation(event)">
+            <input type="hidden" id="location-id">
+            <div class="form-group">
+                <input type="text" id="location-name" placeholder="Location Name" required>
+            </div>
+            <div class="button-group">
+                <button type="submit" class="btn btn-primary">Save Location</button>
+                <button type="button" class="btn btn-secondary" onclick="closeModal('location-modal')">Cancel</button>
+            </div>
+        </form>
+    </div>
+</div>
+{{ end }}

frontend/htmx/contents/dash/projects.html

@@ -0,0 +1,84 @@
+{{ define "content" }}
+<div class="page-header action-bar">
+    <h1>Projects</h1>
+    <button class="btn btn-primary" style="width: auto; padding: 0.6rem 1.2rem; font-size: 0.95rem;" onclick="openProjectModal()">
+        New Project
+    </button>
+</div>
+
+<div class="table-container">
+    <table>
+        <thead>
+        <tr>
+            <th>Name</th>
+            <th>Description</th>
+            <th style="text-align: right;">Actions</th>
+        </tr>
+        </thead>
+        <tbody id="projects-table-body">
+        <tr><td colspan="3" class="table-loader">Loading projects...</td></tr>
+        </tbody>
+    </table>
+</div>
+
+<div id="project-modal" class="modal">
+    <div class="modal-content">
+        <h2 id="project-modal-title">New Project</h2>
+        <form id="project-form" onsubmit="saveProject(event)">
+            <input type="hidden" id="project-id">
+            <div class="form-group">
+                <input type="text" id="project-name" placeholder="Project Name" required>
+            </div>
+            <div class="form-group">
+                <input type="text" id="project-desc" placeholder="Description">
+            </div>
+            <div class="button-group">
+                <button type="submit" class="btn btn-primary">Save Project</button>
+                <button type="button" class="btn btn-secondary" onclick="closeModal('project-modal')">Cancel</button>
+            </div>
+        </form>
+    </div>
+</div>
+
+<div id="association-modal" class="modal">
+    <div class="modal-content large">
+        <h2 id="association-modal-title">Manage Project Items</h2>
+        <div class="modal-split">
+            <div>
+                <h3>Allocated Items</h3>
+                <div class="inner-table">
+                    <table>
+                        <thead>
+                        <tr>
+                            <th>Item</th>
+                            <th>Quantity</th>
+                            <th></th>
+                        </tr>
+                        </thead>
+                        <tbody id="association-table-body">
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+            <div>
+                <h3>Allocate New Item</h3>
+                <form id="association-form" onsubmit="saveAssociation(event)" style="margin-top: 1rem;">
+                    <input type="hidden" id="assoc-project-id">
+                    <div class="form-group">
+                        <select id="assoc-item" class="search-input" style="width: 100%; padding: 0.85rem 1rem; background: #111827; color: white; border: 1px solid var(--border); border-radius: 10px;" required>
+                            <option value="">Select Item...</option>
+                        </select>
+                    </div>
+                    <div class="form-group">
+                        <input type="number" id="assoc-qty" placeholder="Quantity needed" required>
+                    </div>
+                    <div class="button-group">
+                        <button type="submit" class="btn btn-primary">Allocate</button>
+                        <button type="button" class="btn btn-secondary" onclick="closeModal('association-modal')">Done</button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+</div>
+{{ end }}

frontend/htmx/home.html

@@ -1,6 +1,26 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>MiauInv | Private Instance</title>
+    <script src="/assets/js/auth.js"></script>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/home.min.css">
+</head>
 <body>
-        <h1>Hallo, {{.Name}}!</h1>
+
+<main class="card">
+    <div class="header">
+        <h1 class="brand-title">Miau<span>Inv</span></h1>
+        <p class="subtitle">Private Instance</p>
+    </div>
+
+    <div class="home-actions">
+        <a href="/login" class="btn btn-primary">Sign In</a>
+        <a href="/register" class="btn btn-secondary">Create Account</a>
+    </div>
+</main>
+
 </body>
 </html>

frontend/htmx/login.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Sign In | MiauInv</title>
+
+    <script src="/assets/js/auth.min.js" defer></script>
+    <script src="/assets/js/login.min.js" defer></script>
+
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+</head>
+<body>
+
+<main class="card">
+    <div class="header">
+        <h1>Welcome back</h1>
+        <p class="subtitle">Sign in to your account</p>
+    </div>
+
+    <form id="login-form">
+        <div class="form-group">
+            <label for="username" class="sr-only">Username</label>
+            <input type="text" id="username" placeholder="Username" autocomplete="username" required>
+        </div>
+
+        <div class="form-group">
+            <label for="password" class="sr-only">Password</label>
+            <input type="password" id="password" placeholder="Password" autocomplete="current-password" required>
+        </div>
+
+        <button type="submit" class="btn btn-primary">Sign In</button>
+    </form>
+
+    <div id="error" class="message error"></div>
+
+    <p class="footer-text">
+        Don't have an account yet? <a href="/register">Create account</a>
+    </p>
+</main>
+
+</body>
+</html>

frontend/htmx/register-blocked.html

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Registration Disabled - MiauInv</title>
+    <link rel="stylesheet" href="/assets/css/register-blocked.min.css">
+
+</head>
+<body>
+
+<div class="card">
+    <h1>Registration</h1>
+    <div class="subtitle">Create a new account</div>
+
+    <div class="message error">
+        <strong>Access Denied:</strong> Public registration is currently disabled for this system. Please contact your system administrator to request an account.
+    </div>
+
+    <div class="footer-text">
+        <a class="btn btn-secondary" href="/login" style="margin-top: 1.5rem;">Back to Login</a>
+    </div>
+</div>
+
+</body>
+</html>

frontend/htmx/register.html

@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Register | MiauInv</title>
+    <script src="/assets/js/auth.min.js"></script>
+    <script src="/assets/js/register.min.js"></script>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+</head>
+<body>
+
+<main class="card">
+    <div class="header">
+        <h1>Create Account</h1>
+        <p class="subtitle">Register to continue</p>
+    </div>
+
+    <form id="register-form">
+        <div class="form-group">
+            <label for="username" class="sr-only">Username</label>
+            <input type="text" id="username" placeholder="Username" autocomplete="username" required>
+        </div>
+
+        <div class="form-group">
+            <label for="password" class="sr-only">Password</label>
+            <input type="password" id="password" placeholder="Password" autocomplete="new-password" required>
+        </div>
+
+        <button type="submit" class="btn btn-primary">Register</button>
+    </form>
+
+    <div id="message" class="message"></div>
+
+    <p class="footer-text">
+        Already have an account? <a href="/login">Sign in here</a>
+    </p>
+</main>
+
+</body>
+</html>

frontend/htmx/under-construction.html

@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Feature Under Development | MiauInv</title>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/under-construction.min.css">
+</head>
+<body>
+
+<div class="card">
+    <div class="construction-icon-wrapper">
+        <svg class="gear-icon" width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="var(--accent)" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+            <circle cx="12" cy="12" r="3"></circle>
+            <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 1 1-2.83-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 1 1 2.83 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z"></path>
+        </svg>
+    </div>
+
+    <h1>Coming Soon</h1>
+    <div class="subtitle">Feature Under Development</div>
+
+    <div class="message success" style="display: block; margin-bottom: 2rem;">
+        <strong>Development in progress!</strong><br>
+        Our team is actively working on this feature to bring you the best experience possible.
+    </div>
+
+    <a href="/dashboard" class="btn btn-secondary">
+        <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="margin-right: 8px;"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></svg>
+        Back to Dashboard
+    </a>
+
+    <div class="footer-text">
+        Need urgent assistance? <a href="mailto:maurice@miaurizius.de">Contact Developer</a>
+    </div>
+</div>
+
+</body>
+</html>

go.mod

@@ -5,15 +5,17 @@ go 1.26
 require (
 	github.com/glebarez/go-sqlite v1.22.0
 	github.com/golang-jwt/jwt/v5 v5.3.1
+	github.com/google/uuid v1.5.0
+	github.com/tdewolff/minify/v2 v2.24.13
 	golang.org/x/crypto v0.52.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/google/uuid v1.5.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/tdewolff/parse/v2 v2.8.12 // indirect
 	golang.org/x/sys v0.45.0 // indirect
 	modernc.org/libc v1.37.6 // indirect
 	modernc.org/mathutil v1.6.0 // indirect

go.sum

@@ -12,6 +12,13 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/tdewolff/minify/v2 v2.24.13 h1:xrcF7gKDnUszseEY9WX9mUlZII2v2Go/QAcAwRASw58=
+github.com/tdewolff/minify/v2 v2.24.13/go.mod h1:emvwoYeIl8bfAKqRU5ww95LX9Gpggpqv/naal9a8Yq0=
+github.com/tdewolff/parse/v2 v2.8.12 h1:5BBjfaCv482v3nltlS0u6wH1xJaxjR6ofDrWttNvROg=
+github.com/tdewolff/parse/v2 v2.8.12/go.mod h1:Hwlni2tiVNKyzR1o6nUs4FOF07URA+JLBLd6dlIXYqo=
+github.com/tdewolff/test v1.0.11/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
+github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
+github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
 golang.org/x/crypto v0.52.0/go.mod h1:1QgfPxDqh0T2M/elOJtp9RvuR95kVjir0e6/BvEmGbc=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

handlers/account.go

@@ -10,12 +10,13 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strings"
 	"time"
 )
 
 var cfg, _ = config.LoadConfig()
 
-func Register(w http.ResponseWriter, r *http.Request) {
+func APIRegister(w http.ResponseWriter, r *http.Request) {
 	var user models.User
 	if err := json.NewDecoder(r.Body).Decode(&user); err != nil {
 		log.Println("POST [api/register] " + r.RemoteAddr + ": " + err.Error())
@@ -48,7 +49,7 @@ func Register(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusCreated)
 	log.Println("POST [api/register] " + r.RemoteAddr + ": Successfully created user")
 }
-func Login(w http.ResponseWriter, r *http.Request) {
+func APILogin(w http.ResponseWriter, r *http.Request) {
 	var creds struct {
 		Username string `json:"username"`
 		Password string `json:"password"`
@@ -123,6 +124,23 @@ func Login(w http.ResponseWriter, r *http.Request) {
 		},
 	}
 
+	http.SetCookie(w, &http.Cookie{
+		Name:     "access_token",
+		Value:    accessToken,
+		Path:     "/",
+		HttpOnly: true,
+		Secure:   true,
+		SameSite: http.SameSiteLaxMode,
+	})
+	http.SetCookie(w, &http.Cookie{
+		Name:     "refresh_token",
+		Value:    refreshTokenPlain,
+		Path:     "/",
+		HttpOnly: true,
+		Secure:   true,
+		SameSite: http.SameSiteLaxMode,
+	})
+
 	w.Header().Set("Content-Type", "application/json")
 	err = json.NewEncoder(w).Encode(resp)
 	if err != nil {
@@ -155,7 +173,7 @@ func TestHandler(w http.ResponseWriter, r *http.Request) {
 		log.Println("GET [api/ping] " + r.RemoteAddr + ": " + err.Error())
 		return
 	}
-	log.Println("GET [api/login] " + r.RemoteAddr + ": Successfully tested connection")
+	log.Println("GET [api/ping] " + r.RemoteAddr + ": Successfully tested connection")
 }
 func RefreshToken(w http.ResponseWriter, r *http.Request) {
 	var req struct {
@@ -225,6 +243,38 @@ func UserInfo(w http.ResponseWriter, r *http.Request) {
 	}
 	query := r.URL.Query()
 	idParam := query.Get("id")
+
+	if idParam == "" {
+		tokenStr := ""
+		authHeader := r.Header.Get("Authorization")
+
+		if strings.HasPrefix(authHeader, "Bearer ") {
+			tokenStr = strings.TrimPrefix(authHeader, "Bearer ")
+		}
+
+		if tokenStr == "" {
+			cookie, err := r.Cookie("access_token")
+			if err == nil {
+				tokenStr = cookie.Value
+			}
+		}
+
+		if tokenStr == "" {
+			http.Error(w, "Missing token", http.StatusUnauthorized)
+			return
+		}
+
+		claims, err := auth.ValidateJWT(tokenStr, models.JWTSecret)
+
+		if err != nil {
+			log.Println("GET [api/userinfo] " + r.RemoteAddr + ": " + err.Error())
+			http.Error(w, "Unauthorized: Invalid or expired token", http.StatusUnauthorized)
+			return
+		}
+
+		idParam = claims.UserID
+	}
+
 	user, err := storage.GetUserById(idParam)
 	if err != nil {
 		log.Println("GET [api/userinfo] " + r.RemoteAddr + ": User " + idParam + " not found")
@@ -234,12 +284,12 @@ func UserInfo(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	err = json.NewEncoder(w).Encode(map[string]interface{}{
 		"id":         user.ID,
-		"name":       user.Username,
+		"username":   user.Username,
 		"avatar_url": "",
 	})
 	if err != nil {
 		log.Println("GET [api/userinfo] " + r.RemoteAddr + ": " + err.Error())
 		return
 	}
-	log.Println("GET [api/userinfo] " + r.RemoteAddr + ": Successfully retrieved user info")
+	log.Println("GET [api/userinfo] " + r.RemoteAddr + ": Successfully retrieved user info of " + user.Username + " (" + user.ID + ")")
 }

handlers/api.go

@@ -0,0 +1,679 @@
+package handlers
+
+import (
+	"MiauInv/models"
+	"MiauInv/storage"
+	"database/sql"
+	"encoding/json"
+	"log"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+func Location(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	switch r.Method {
+
+	case http.MethodGet:
+		idStr := r.URL.Query().Get("id")
+		contentMode := r.URL.Query().Get("content")
+
+		if idStr != "" && contentMode == "true" {
+			locationID, err := strconv.Atoi(idStr)
+			if err != nil {
+				http.Error(w, "Invalid location ID", http.StatusBadRequest)
+				return
+			}
+
+			query := `
+				SELECT s.item_id, i.name, s.quantity 
+				FROM stock s
+				JOIN items i ON s.item_id = i.id
+				WHERE s.location_id = ? AND s.quantity > 0
+			`
+
+			rows, err := storage.DB.Query(query, locationID)
+			if err != nil {
+				http.Error(w, "Database error", http.StatusInternalServerError)
+				return
+			}
+			defer rows.Close()
+
+			var contents []models.LocationContent
+			for rows.Next() {
+				var c models.LocationContent
+				if err := rows.Scan(&c.ItemID, &c.ItemName, &c.Quantity); err != nil {
+					http.Error(w, "Row scan error", http.StatusInternalServerError)
+					return
+				}
+				contents = append(contents, c)
+			}
+
+			json.NewEncoder(w).Encode(map[string]interface{}{"contents": contents})
+			return
+		}
+
+		if idStr != "" {
+			id, err := strconv.Atoi(idStr)
+			if err != nil {
+				http.Error(w, "Invalid ID parameter", http.StatusBadRequest)
+				return
+			}
+
+			var loc models.Location
+			err = storage.DB.QueryRow("SELECT id, name FROM locations WHERE id = ?", id).Scan(&loc.ID, &loc.Name)
+			if err != nil {
+				if err == sql.ErrNoRows {
+					log.Println("GET [api/locations] " + r.RemoteAddr + ": Location not found (ID " + idStr + ")")
+					http.Error(w, "Location not found", http.StatusNotFound)
+					return
+				}
+				log.Println("GET [api/locations] DB Error: " + err.Error())
+				http.Error(w, "Internal server error", http.StatusInternalServerError)
+				return
+			}
+
+			json.NewEncoder(w).Encode(loc)
+			log.Println("GET [api/locations] " + r.RemoteAddr + ": Successfully retrieved location ID " + idStr)
+			return
+		}
+
+		rows, err := storage.DB.Query("SELECT id, name FROM locations ORDER BY name ASC")
+		if err != nil {
+			log.Println("GET [api/locations] " + r.RemoteAddr + ": " + err.Error())
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+		defer rows.Close()
+
+		var locations []models.Location
+		for rows.Next() {
+			var loc models.Location
+			if err := rows.Scan(&loc.ID, &loc.Name); err != nil {
+				log.Println("GET [api/locations] Scan Error: " + err.Error())
+				continue
+			}
+			locations = append(locations, loc)
+		}
+
+		if locations == nil {
+			locations = []models.Location{}
+		}
+
+		json.NewEncoder(w).Encode(map[string]interface{}{
+			"locations": locations,
+		})
+		log.Println("GET [api/locations] " + r.RemoteAddr + ": Successfully retrieved all locations")
+
+	case http.MethodPost:
+		var body struct {
+			Name string `json:"name"`
+		}
+
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			log.Println("POST [api/locations] Decode Error: " + err.Error())
+			http.Error(w, "Invalid request body", http.StatusBadRequest)
+			return
+		}
+
+		if strings.TrimSpace(body.Name) == "" {
+			http.Error(w, "Location name cannot be empty", http.StatusBadRequest)
+			return
+		}
+
+		res, err := storage.DB.Exec("INSERT INTO locations(name) VALUES(?)", body.Name)
+		if err != nil {
+			log.Println("POST [api/locations] DB Error: " + err.Error())
+			http.Error(w, "Location already exists or database error", http.StatusConflict)
+			return
+		}
+
+		lastID, _ := res.LastInsertId()
+
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(models.Location{
+			ID:   int(lastID),
+			Name: body.Name,
+		})
+		log.Println("POST [api/locations] " + r.RemoteAddr + ": Successfully created location " + body.Name)
+
+	case http.MethodPut:
+		idStr := r.URL.Query().Get("id")
+		if idStr == "" {
+			http.Error(w, "Missing ID parameter for update", http.StatusBadRequest)
+			return
+		}
+
+		id, err := strconv.Atoi(idStr)
+		if err != nil {
+			http.Error(w, "Invalid ID parameter", http.StatusBadRequest)
+			return
+		}
+
+		var body struct {
+			Name string `json:"name"`
+		}
+
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			log.Println("PUT [api/locations] Decode Error: " + err.Error())
+			http.Error(w, "Invalid request body", http.StatusBadRequest)
+			return
+		}
+
+		if strings.TrimSpace(body.Name) == "" {
+			http.Error(w, "Location name cannot be empty", http.StatusBadRequest)
+			return
+		}
+
+		res, err := storage.DB.Exec("UPDATE locations SET name = ? WHERE id = ?", body.Name, id)
+		if err != nil {
+			log.Println("PUT [api/locations] DB Error: " + err.Error())
+			http.Error(w, "Location name unique constraint failed or database error", http.StatusConflict)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Location not found", http.StatusNotFound)
+			return
+		}
+
+		json.NewEncoder(w).Encode(models.Location{
+			ID:   id,
+			Name: body.Name,
+		})
+		log.Println("PUT [api/locations] " + r.RemoteAddr + ": Successfully updated location ID " + idStr)
+
+	case http.MethodDelete:
+		idStr := r.URL.Query().Get("id")
+		if idStr == "" {
+			http.Error(w, "Missing ID parameter for deletion", http.StatusBadRequest)
+			return
+		}
+
+		id, err := strconv.Atoi(idStr)
+		if err != nil {
+			http.Error(w, "Invalid ID parameter", http.StatusBadRequest)
+			return
+		}
+
+		res, err := storage.DB.Exec("DELETE FROM locations WHERE id = ?", id)
+		if err != nil {
+			log.Println("DELETE [api/locations] DB Error: " + err.Error())
+			http.Error(w, "Cannot delete location. It might still be in use by inventory stock.", http.StatusConflict)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Location not found", http.StatusNotFound)
+			return
+		}
+
+		w.WriteHeader(http.StatusNoContent)
+		log.Println("DELETE [api/locations] " + r.RemoteAddr + ": Successfully deleted location ID " + idStr)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+func Item(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	switch r.Method {
+	case http.MethodGet:
+
+		idStr := r.URL.Query().Get("id")
+
+		if idStr != "" {
+			id, err := strconv.Atoi(idStr)
+			if err != nil {
+				http.Error(w, "Invalid ID parameter", http.StatusBadRequest)
+				return
+			}
+
+			var item models.Item
+			err = storage.DB.QueryRow("SELECT id, name, category, description, total_quantity FROM items WHERE id = ?", id).Scan(&item.ID, &item.Name, &item.Category, &item.Description, &item.TotalQuantity)
+			if err != nil {
+				if err == sql.ErrNoRows {
+					log.Println("GET [api/locations] " + r.RemoteAddr + ": Location not found (ID " + idStr + ")")
+					http.Error(w, "Location not found", http.StatusNotFound)
+					return
+				}
+				log.Println("GET [api/item] DB Error: " + err.Error())
+				http.Error(w, "Internal server error", http.StatusInternalServerError)
+				return
+			}
+
+			json.NewEncoder(w).Encode(item)
+			log.Println("GET [api/item] " + r.RemoteAddr + ": Successfully retrieved item ID " + idStr)
+			return
+		}
+
+		query := `
+		SELECT 
+			i.id, i.name, i.category, i.description,
+			COALESCE((SELECT SUM(quantity) FROM stock WHERE item_id = i.id), 0) as total_qty,
+			COALESCE((SELECT SUM(quantity) FROM project_items WHERE item_id = i.id), 0) as allocated_qty
+		FROM items i
+		ORDER BY i.name ASC
+	`
+		rows, err := storage.DB.Query(query)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+		defer rows.Close()
+
+		var itemsExtended []models.ItemExtended
+		for rows.Next() {
+			var ie models.ItemExtended
+			err := rows.Scan(&ie.ID, &ie.Name, &ie.Category, &ie.Description, &ie.TotalQuantity, &ie.AllocatedQty)
+			if err != nil {
+				continue
+			}
+			ie.AvailableQty = ie.TotalQuantity - ie.AllocatedQty
+			itemsExtended = append(itemsExtended, ie)
+		}
+		json.NewEncoder(w).Encode(map[string]interface{}{"items": itemsExtended})
+		return
+
+	case http.MethodPost:
+		var body models.Item
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			http.Error(w, "Invalid request body", http.StatusBadRequest)
+			return
+		}
+
+		res, err := storage.DB.Exec("INSERT INTO items(name, category, description, total_quantity) VALUES(?, ?, ?, ?)",
+			body.Name, body.Category, body.Description, body.TotalQuantity)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+
+		lastID, _ := res.LastInsertId()
+		body.ID = int(lastID)
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodPut:
+		idStr := r.URL.Query().Get("id")
+		if idStr == "" {
+			http.Error(w, "Missing ID parameter", http.StatusBadRequest)
+			return
+		}
+		id, _ := strconv.Atoi(idStr)
+
+		var body models.Item
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("UPDATE items SET name = ?, category = ?, description = ?, total_quantity = ? WHERE id = ?",
+			body.Name, body.Category, body.Description, body.TotalQuantity, id)
+		if err != nil {
+			http.Error(w, "Database error", http.StatusInternalServerError)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Item not found", http.StatusNotFound)
+			return
+		}
+
+		body.ID = id
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodDelete:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		// SQLite blockiert dank FK, falls Item noch im Stock oder Projekten ist
+		res, err := storage.DB.Exec("DELETE FROM items WHERE id = ?", id)
+		if err != nil {
+			http.Error(w, "Cannot delete item. Still referenced in stock or projects.", http.StatusConflict)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Item not found", http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+func Project(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	switch r.Method {
+	case http.MethodGet:
+		idStr := r.URL.Query().Get("id")
+
+		detailsMode := r.URL.Query().Get("details")
+
+		if idStr != "" && detailsMode == "true" {
+			projectID, err := strconv.Atoi(idStr)
+			if err != nil {
+				http.Error(w, "Invalid project ID", http.StatusBadRequest)
+				return
+			}
+
+			query := `
+				SELECT pi.item_id, i.name, pi.quantity 
+				FROM project_items pi
+				JOIN items i ON pi.item_id = i.id
+				WHERE pi.project_id = ?
+			`
+
+			rows, err := storage.DB.Query(query, projectID)
+			if err != nil {
+				http.Error(w, "Database error", http.StatusInternalServerError)
+				return
+			}
+			defer rows.Close()
+
+			var details []models.ProjectDetailItem
+			for rows.Next() {
+				var d models.ProjectDetailItem
+				if err := rows.Scan(&d.ItemID, &d.ItemName, &d.Quantity); err != nil {
+					http.Error(w, "Row scan error", http.StatusInternalServerError)
+					return
+				}
+				details = append(details, d)
+			}
+
+			json.NewEncoder(w).Encode(map[string]interface{}{"items": details})
+			return
+		}
+
+		if idStr != "" {
+			id, _ := strconv.Atoi(idStr)
+			var p models.Project
+			err := storage.DB.QueryRow("SELECT id, name, description FROM projects WHERE id = ?", id).Scan(&p.ID, &p.Name, &p.Description)
+			if err == sql.ErrNoRows {
+				http.Error(w, "Project not found", http.StatusNotFound)
+				return
+			}
+			json.NewEncoder(w).Encode(p)
+			return
+		}
+
+		rows, err := storage.DB.Query("SELECT id, name, description FROM projects ORDER BY name ASC")
+		if err != nil {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+		defer rows.Close()
+
+		projects := []models.Project{}
+		for rows.Next() {
+			var p models.Project
+			rows.Scan(&p.ID, &p.Name, &p.Description)
+			projects = append(projects, p)
+		}
+		json.NewEncoder(w).Encode(map[string]interface{}{"projects": projects})
+
+	case http.MethodPost:
+		var body models.Project
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("INSERT INTO projects(name, description) VALUES(?, ?)", body.Name, body.Description)
+		if err != nil {
+			http.Error(w, "Project name already exists", http.StatusConflict)
+			return
+		}
+
+		lastID, _ := res.LastInsertId()
+		body.ID = int(lastID)
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodPut:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		var body models.Project
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("UPDATE projects SET name = ?, description = ? WHERE id = ?", body.Name, body.Description, id)
+		if err != nil {
+			http.Error(w, "Project name constraint violation", http.StatusConflict)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Project not found", http.StatusNotFound)
+			return
+		}
+		body.ID = id
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodDelete:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		res, err := storage.DB.Exec("DELETE FROM projects WHERE id = ?", id)
+		if err != nil {
+			http.Error(w, "Cannot delete project. Clear active item assignments first.", http.StatusConflict)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Project not found", http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+func Stock(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	switch r.Method {
+	case http.MethodGet:
+		idStr := r.URL.Query().Get("id")
+
+		if idStr != "" {
+			id, _ := strconv.Atoi(idStr)
+			var s models.Stock
+			err := storage.DB.QueryRow("SELECT id, item_id, location_id, quantity FROM stock WHERE id = ?", id).
+				Scan(&s.ID, &s.ItemID, &s.LocationID, &s.Quantity)
+			if err == sql.ErrNoRows {
+				http.Error(w, "Stock entry not found", http.StatusNotFound)
+				return
+			}
+			json.NewEncoder(w).Encode(s)
+			return
+		}
+
+		rows, err := storage.DB.Query("SELECT id, item_id, location_id, quantity FROM stock")
+		if err != nil {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+		defer rows.Close()
+
+		stocks := []models.Stock{}
+		for rows.Next() {
+			var s models.Stock
+			rows.Scan(&s.ID, &s.ItemID, &s.LocationID, &s.Quantity)
+			stocks = append(stocks, s)
+		}
+		json.NewEncoder(w).Encode(map[string]interface{}{"stock": stocks})
+
+	case http.MethodPost:
+		var body models.Stock
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("INSERT INTO stock(item_id, location_id, quantity) VALUES(?, ?, ?)",
+			body.ItemID, body.LocationID, body.Quantity)
+		if err != nil {
+			http.Error(w, "Failed to link stock. Ensure Item and Location exist.", http.StatusBadRequest)
+			return
+		}
+
+		lastID, _ := res.LastInsertId()
+		body.ID = int(lastID)
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodPut:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		var body models.Stock
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("UPDATE stock SET item_id = ?, location_id = ?, quantity = ? WHERE id = ?",
+			body.ItemID, body.LocationID, body.Quantity, id)
+		if err != nil {
+			http.Error(w, "Failed to update stock. Verify Foreign Keys.", http.StatusBadRequest)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Stock entry not found", http.StatusNotFound)
+			return
+		}
+		body.ID = id
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodDelete:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		res, _ := storage.DB.Exec("DELETE FROM stock WHERE id = ?", id)
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Stock entry not found", http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+func Associations(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	switch r.Method {
+	case http.MethodGet:
+		idStr := r.URL.Query().Get("id")
+		projectIDStr := r.URL.Query().Get("project_id")
+
+		// Optionaler Filter: Alle Items für ein bestimmtes Projekt holen (?project_id=X)
+		if projectIDStr != "" {
+			pID, _ := strconv.Atoi(projectIDStr)
+			rows, err := storage.DB.Query("SELECT id, item_id, project_id, quantity FROM project_items WHERE project_id = ?", pID)
+			if err != nil {
+				http.Error(w, "Internal server error", http.StatusInternalServerError)
+				return
+			}
+			defer rows.Close()
+
+			list := []models.ProjectItem{}
+			for rows.Next() {
+				var pi models.ProjectItem
+				rows.Scan(&pi.ID, &pi.ItemID, &pi.ProjectID, &pi.Quantity)
+				list = append(list, pi)
+			}
+			json.NewEncoder(w).Encode(map[string]interface{}{"associations": list})
+			return
+		}
+
+		// Einzelne Assoziation anhand der Tabellen-ID (?id=X)
+		if idStr != "" {
+			id, _ := strconv.Atoi(idStr)
+			var pi models.ProjectItem
+			err := storage.DB.QueryRow("SELECT id, item_id, project_id, quantity FROM project_items WHERE id = ?", id).
+				Scan(&pi.ID, &pi.ItemID, &pi.ProjectID, &pi.Quantity)
+			if err == sql.ErrNoRows {
+				http.Error(w, "Association not found", http.StatusNotFound)
+				return
+			}
+			json.NewEncoder(w).Encode(pi)
+			return
+		}
+
+		// Gar kein Parameter -> Komplett-Dump aller Zuweisungen
+		rows, err := storage.DB.Query("SELECT id, item_id, project_id, quantity FROM project_items")
+		if err != nil {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+		defer rows.Close()
+
+		all := []models.ProjectItem{}
+		for rows.Next() {
+			var pi models.ProjectItem
+			rows.Scan(&pi.ID, &pi.ItemID, &pi.ProjectID, &pi.Quantity)
+			all = append(all, pi)
+		}
+		json.NewEncoder(w).Encode(map[string]interface{}{"associations": all})
+
+	case http.MethodPost:
+		var body models.ProjectItem
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("INSERT INTO project_items(item_id, project_id, quantity) VALUES(?, ?, ?)",
+			body.ItemID, body.ProjectID, body.Quantity)
+		if err != nil {
+			http.Error(w, "Link failed. Check item_id and project_id.", http.StatusBadRequest)
+			return
+		}
+
+		lastID, _ := res.LastInsertId()
+		body.ID = int(lastID)
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodPut:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		var body models.ProjectItem
+		json.NewDecoder(r.Body).Decode(&body)
+
+		res, err := storage.DB.Exec("UPDATE project_items SET item_id = ?, project_id = ?, quantity = ? WHERE id = ?",
+			body.ItemID, body.ProjectID, body.Quantity, id)
+		if err != nil {
+			http.Error(w, "Update failed. Check Constraints.", http.StatusBadRequest)
+			return
+		}
+
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Association not found", http.StatusNotFound)
+			return
+		}
+		body.ID = id
+		json.NewEncoder(w).Encode(body)
+
+	case http.MethodDelete:
+		idStr := r.URL.Query().Get("id")
+		id, _ := strconv.Atoi(idStr)
+
+		res, _ := storage.DB.Exec("DELETE FROM project_items WHERE id = ?", id)
+		rowsAffected, _ := res.RowsAffected()
+		if rowsAffected == 0 {
+			http.Error(w, "Association not found", http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}

models/constants.go

@@ -1,5 +1,7 @@
 package models
 
+var JWTSecret []byte
+
 // Roles
 const (
 	RoleUser  = "user"

models/inventory.go

@@ -0,0 +1,66 @@
+package models
+
+type Item struct {
+	ID            int    `json:"id"`
+	Name          string `json:"name"`
+	Category      string `json:"category"`
+	Description   string `json:"description"`
+	TotalQuantity int    `json:"total_quantity"` // Berechnet aus der Summe aller Stocks
+	FreeQuantity  int    `json:"free_quantity"`  // TotalQuantity minus Summe aller Projekt-Zuweisungen
+}
+
+type Location struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+}
+
+type Project struct {
+	ID          int    `json:"id"`
+	Name        string `json:"name"`
+	Description string `json:"description"`
+}
+
+type Stock struct {
+	ID           int    `json:"id"`
+	ItemID       int    `json:"item_id"`
+	LocationID   int    `json:"location_id"`
+	Quantity     int    `json:"quantity"`
+	LocationName string `json:"location_name"` // Used to display the location in the modal table
+}
+
+type Association struct {
+	ID        int    `json:"id"`
+	ProjectID int    `json:"project_id"`
+	ItemID    int    `json:"item_id"`
+	Quantity  int    `json:"quantity"`
+	ItemName  string `json:"item_name"` // Used to display the item name in the modal table
+}
+
+type ProjectItem struct {
+	ID        int `json:"id"`
+	ItemID    int `json:"item_id"`
+	ProjectID int `json:"project_id"`
+	Quantity  int `json:"quantity"`
+}
+
+type ItemExtended struct {
+	ID            int    `json:"id"`
+	Name          string `json:"name"`
+	Category      string `json:"category"`
+	Description   string `json:"description"`
+	TotalQuantity int    `json:"total_quantity"`     // Summe aus allen Stock-Einträgen
+	AllocatedQty  int    `json:"allocated_quantity"` // Summe aus allen Projekt-Zuweisungen
+	AvailableQty  int    `json:"available_quantity"` // Total - Allocated
+}
+
+type LocationContent struct {
+	ItemID   int    `json:"item_id"`
+	ItemName string `json:"item_name"`
+	Quantity int    `json:"quantity"`
+}
+
+type ProjectDetailItem struct {
+	ItemID   int    `json:"item_id"`
+	ItemName string `json:"item_name"`
+	Quantity int    `json:"quantity"`
+}

server/server.go

@@ -1,9 +1,12 @@
 package server
 
 import (
+	"MiauInv/auth"
 	"MiauInv/config"
 	"MiauInv/frontend"
 	"MiauInv/handlers"
+	"MiauInv/models"
+	utils "MiauInv/util"
 	"log"
 	"net/http"
 	"os"
@@ -15,6 +18,7 @@ type Server struct {
 	DatabasePath      string
 	CertificatePath   string
 	PrivateKeyPath    string
+	AllowRegistration bool
 }
 
 func InitServer() *Server {
@@ -41,12 +45,15 @@ func InitServer() *Server {
 		return nil
 	}
 
+	models.JWTSecret = []byte(jwtSecret)
+
 	return &Server{
 		Port:              cfg.Port,
 		JWTSecret:         []byte(jwtSecret),
 		DatabasePath:      cfg.DatabasePath,
 		CertificatePath:   cfg.CertificatePath,
 		PrivateKeyPath:    cfg.PrivateKeyPath,
+		AllowRegistration: cfg.AllowRegistration,
 	}
 }
 
@@ -58,20 +65,39 @@ func (this *Server) Run() {
 	// FRONTEND
 	//
 	mux.HandleFunc("/", frontend.Home)
+	mux.HandleFunc("/login", utils.RenderFile("frontend/htmx/login.html"))
+	mux.Handle("/dashboard", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(frontend.Dashboard)))
+	mux.Handle("/inventory", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(frontend.Inventory)))
+	mux.Handle("/items", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(frontend.Items)))
+	mux.Handle("/locations", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(frontend.Locations)))
+	mux.Handle("/projects", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(frontend.Projects)))
+	mux.HandleFunc("/profile/", utils.RenderFile("frontend/htmx/under-construction.html"))
+	if this.AllowRegistration {
+		mux.HandleFunc("/register", utils.RenderFile("frontend/htmx/register.html"))
+	} else {
+		mux.HandleFunc("/register", utils.RenderFile("frontend/htmx/register-blocked.html"))
+	}
 
 	//
 	// API
 	//
-
+	mux.HandleFunc("/api/login", handlers.APILogin)
-	// Public
-	mux.HandleFunc("/api/login", handlers.Login)
-	mux.HandleFunc("/api/register", handlers.Register)
 	mux.HandleFunc("/api/refresh", handlers.RefreshToken)
-	mux.HandleFunc("/api/logout", handlers.Logout)
+	mux.Handle("/api/logout", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Logout)))
+	mux.Handle("/api/profile", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.UserInfo)))
+	mux.HandleFunc("/api/userinfo", handlers.UserInfo)
+	if this.AllowRegistration {
+		mux.HandleFunc("/api/register", handlers.APIRegister)
+	}
 
-	// Login required
+	mux.Handle("/api/item", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Item)))
+	mux.Handle("/api/location", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Location)))
+	mux.Handle("/api/project", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Project)))
+	mux.Handle("/api/stock", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Stock)))
+	mux.Handle("/api/association", auth.AuthMiddleware(this.JWTSecret)(http.HandlerFunc(handlers.Associations)))
 
-	// Admin-only
+	// Assets
+	mux.HandleFunc("/assets/", frontend.Assets)
 
 	log.Printf("Listening on port %s", this.Port)
 	log.Fatal(http.ListenAndServeTLS(":"+this.Port, this.CertificatePath, this.PrivateKeyPath, mux))

storage/inventory.go

@@ -0,0 +1,52 @@
+package storage
+
+import "MiauInv/models"
+
+func AddItem(item models.Item) error {
+	_, err := DB.Exec(
+		"INSERT INTO items(name, category, description, total_quantity) VALUES(?,?,?,?)",
+		item.Name,
+		item.Category,
+		item.Description,
+		item.TotalQuantity,
+	)
+
+	return err
+}
+
+func GetItems() ([]models.Item, error) {
+
+	rows, err := DB.Query(`
+		SELECT id,name,category,description,total_quantity
+		FROM items
+	`)
+
+	if err != nil {
+		return nil, err
+	}
+
+	defer rows.Close()
+
+	var items []models.Item
+
+	for rows.Next() {
+
+		var item models.Item
+
+		err = rows.Scan(
+			&item.ID,
+			&item.Name,
+			&item.Category,
+			&item.Description,
+			&item.TotalQuantity,
+		)
+
+		if err != nil {
+			return nil, err
+		}
+
+		items = append(items, item)
+	}
+
+	return items, nil
+}

storage/storage.go

@@ -45,25 +45,37 @@ func InitDB(filepath string) error {
 	    id INTEGER PRIMARY KEY AUTOINCREMENT,
 	    name TEXT NOT NULL,
 	    category TEXT,
+	    description TEXT,
 	    total_quantity INTEGER NOT NULL DEFAULT 0
 	);
 	
 	CREATE TABLE IF NOT EXISTS locations (
 	    id INTEGER PRIMARY KEY AUTOINCREMENT,
-        name TEXT NOT NULL
+	    name TEXT NOT NULL UNIQUE
 	);
 	
 	CREATE TABLE IF NOT EXISTS projects (
 	    id INTEGER PRIMARY KEY AUTOINCREMENT,
-        name TEXT NOT NULL
+	    name TEXT NOT NULL UNIQUE,
+	    description TEXT
 	);
 	
-    CREATE TABLE IF NOT EXISTS item_allocations (
+	CREATE TABLE IF NOT EXISTS stock (
 	    id INTEGER PRIMARY KEY AUTOINCREMENT,
 	    item_id INTEGER NOT NULL,
-        location_id INTEGER,
+	    location_id INTEGER NOT NULL,
-        project_id INTEGER,
+	    quantity INTEGER NOT NULL,
-        quantity INTEGER NOT NULL
+	    FOREIGN KEY(item_id) REFERENCES items(id),
+	    FOREIGN KEY(location_id) REFERENCES locations(id)
+	);
+	
+	CREATE TABLE IF NOT EXISTS project_items (
+	    id INTEGER PRIMARY KEY AUTOINCREMENT,
+	    item_id INTEGER NOT NULL,
+	    project_id INTEGER NOT NULL,
+	    quantity INTEGER NOT NULL,
+	    FOREIGN KEY(item_id) REFERENCES items(id),
+	    FOREIGN KEY(project_id) REFERENCES projects(id)
 	);
     `
 

util/util.go

@@ -47,3 +47,8 @@ func IsLoggedIn(w http.ResponseWriter, r *http.Request) (*auth.Claims, bool) {
 	}
 	return claims, true
 }
+func RenderFile(path string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		http.ServeFile(w, r, path)
+	}
+}