package middleware

import (
	"fmt"
	"gitea.zjmud.xyz/phyer/rbac/config"
	"net/http"

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

func JWTAuthMiddleware() gin.HandlerFunc {
	cfg := config.LoadConfig()
	return func(c *gin.Context) {
		tokenString := c.GetHeader("Authorization")
		if tokenString == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header missing"})
			return
		}

		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 {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
			return
		}

		claims, ok := token.Claims.(jwt.MapClaims)
		if !ok {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
			return
		}

		c.Set("userID", claims["sub"])
		c.Next()
	}
}