package middleware

import (
	"net/http"
	"strings"

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

func AuthMiddleware(secret string) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "authorization header required"})
			return
		}

		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (any, error) {
			return []byte(secret), nil
		})

		if err != nil || !token.Valid {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
			return
		}

		if claims, ok := token.Claims.(jwt.MapClaims); ok {
			// Add user ID to context
			c.Set("userID", claims["sub"])
			c.Set("username", claims["username"])
		}
		c.Next()
	}
}