/*
* Author: RSK World
* Email: help@rskworld.in / support@rskworld.in
* Website: https://rskworld.in/contact.php
* Year: 2026
*/

package middleware

import (
	"fmt"
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"github.com/rskworld/go-rest-api/internal/config"
	"github.com/rskworld/go-rest-api/internal/response"
)

func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			response.Unauthorized(c, "Authorization header is required")
			c.Abort()
			return
		}

		bearerToken := strings.Split(authHeader, " ")
		if len(bearerToken) != 2 {
			response.Unauthorized(c, "Invalid token format")
			c.Abort()
			return
		}

		tokenString := bearerToken[1]
		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
			}
			return []byte(cfg.JWTSecret), nil
		})

		if err != nil || !token.Valid {
			response.Unauthorized(c, "Invalid token")
			c.Abort()
			return
		}

		if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
			c.Set("user_id", claims["user_id"])
			if role, exists := claims["role"]; exists {
				c.Set("user_role", role)
			} else {
				c.Set("user_role", "user") // Default role if not specified
			}
		} else {
			response.Unauthorized(c, "Invalid token claims")
			c.Abort()
			return
		}

		c.Next()
	}
}