package middleware

import (
	"os"
	"strings"

	"github.com/gofiber/fiber/v2"
	"github.com/golang-jwt/jwt/v5"
)

func AuthMiddleware(c *fiber.Ctx) error {
	tokenString := c.Get("Authorization")
	tokenString = strings.TrimPrefix(tokenString, "Bearer ")

	if tokenString == "" {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{
			"message": "Missing or invalid token",
		})
	}

	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		return []byte(os.Getenv("API_KEY")), nil
	})

	if err != nil || !token.Valid {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{
			"message": "Invalid or expired token",
		})
	}

	claims, ok := token.Claims.(jwt.MapClaims)
	if !ok {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{
			"message": "Invalid token claims",
		})
	}

	userID := claims["sub"].(string)

	c.Locals("userID", userID)

	return c.Next()
}