package middleware

import (
	"net/http"
	"solacenet-gateway/config"
	"strings"

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

// AuthMiddleware validates JWT tokens
func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{
				"error": "Authorization header required",
			})
			c.Abort()
			return
		}

		// Extract token
		parts := strings.Split(authHeader, " ")
		if len(parts) != 2 || parts[0] != "Bearer" {
			c.JSON(http.StatusUnauthorized, gin.H{
				"error": "Invalid authorization header format",
			})
			c.Abort()
			return
		}

		tokenString := parts[1]

		// Parse and validate token
		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
			return []byte(cfg.JWTSecret), nil
		})

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

		// Extract claims
		if claims, ok := token.Claims.(jwt.MapClaims); ok {
			c.Set("userID", claims["sub"])
			c.Set("tenantID", claims["tenantId"])
		}

		c.Next()
	}
}