package auth

import (
	"os"
	"time"

	"github.com/golang-jwt/jwt/v5"
)

type Claims struct {
	UserID string `json:"user_id"`
	Role   string `json:"role"`
	jwt.RegisteredClaims
}

var secret = os.Getenv("SHAP_JWT_SECRET")

func GenerateJWT(userID, role string, secret []byte) (string, error) {
	claims := Claims{
		UserID: userID,
		Role:   role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(15 * time.Minute)),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString(secret)
}
func ValidateJWT(tokenStr string, secret []byte) (*Claims, error) {
	token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(token *jwt.Token) (interface{}, error) {
		return secret, nil
	})
	if err != nil {
		return nil, err
	}

	claims, ok := token.Claims.(*Claims)
	if !ok || !token.Valid {
		return nil, err
	}

	return claims, nil
}