Added ExpenseAdder Endpoint

handlers/expenses.go

@@ -1,7 +1,66 @@
 package handlers
 
-import "net/http"
+import (
+	"encoding/json"
+	"net/http"
+	"shap-planner-backend/models"
+	"shap-planner-backend/storage"
+	"shap-planner-backend/utils"
+)
 
-func GetExpenses(w http.ResponseWriter, r *http.Request) {}
+func Expenses(w http.ResponseWriter, r *http.Request) {
+	claims, _ := utils.IsLoggedIn(w, r)
 
+	switch r.Method {
+	case http.MethodGet: // -> Get Expenses
+		break
+	case http.MethodPost: // -> Create Expense
+		var body struct {
+			Expense models.Expense        `json:"expense"`
+			Shares  []models.ExpenseShare `json:"shares"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			http.Error(w, "Invalid request body", http.StatusBadRequest)
+			return
+		}
+		if claims.UserID != body.Expense.PayerID { // You cannot create an expense in the name of another user
+			http.Error(w, "Invalid request", http.StatusUnauthorized)
+			return
+		}
+		if body.Expense.ID != "" {
+			http.Error(w, "Invalid request", http.StatusUnauthorized)
+			return
+		}
+		body.Expense.ID = utils.GenerateUUID()
+		for _, share := range body.Shares {
+			if share.ID != "" {
+				http.Error(w, "Invalid request", http.StatusUnauthorized)
+				return
+			}
+			if share.ExpenseID != "" {
+				http.Error(w, "Invalid request", http.StatusUnauthorized)
+				return
+			}
+			share.ExpenseID = body.Expense.ID
+			share.ID = utils.GenerateUUID()
+			err := storage.AddShare(&share)
+			if err != nil {
+				println(err.Error())
+				http.Error(w, "Error adding expense", http.StatusBadRequest) // Should never happen
+				return
+			}
+		}
+		err := storage.AddExpense(&body.Expense)
+		if err != nil {
+			println(err.Error())
+			http.Error(w, "Error adding expense", http.StatusBadRequest)
+			return
+		}
+		w.WriteHeader(http.StatusCreated)
+		break
+	case http.MethodPut: // -> Update Expense
+		break
+	case http.MethodDelete: // -> Delete Expense
+	}
+}
 func AdminPanel(w http.ResponseWriter, r *http.Request) {}