package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"

	"niumall-go/utils"
)

// AuthMiddleware authenticates requests using JWT
func AuthMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		// Get authorization header
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
			c.Abort()
			return
		}

		// Check if header has Bearer prefix
		if !strings.HasPrefix(authHeader, "Bearer ") {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid authorization header format"})
			c.Abort()
			return
		}

		// Extract token
		tokenString := strings.TrimPrefix(authHeader, "Bearer ")

		// Parse and validate token
		claims, err := utils.ParseJWT(tokenString)
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid or expired token"})
			c.Abort()
			return
		}

		// Set user UUID in context for use in handlers
		c.Set("user_uuid", claims.UUID)
		c.Next()
	}
}