package middleware

import (
	"net/http"
	"strings"

	"counter/internal/infrastructure/security"

	"github.com/gin-gonic/gin"
)

// AuthMiddleware validates JWT token and sets user context
func AuthMiddleware(jwtService security.JWTService) 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 from "Bearer <token>"
		tokenParts := strings.Split(authHeader, " ")
		if len(tokenParts) != 2 || tokenParts[0] != "Bearer" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid authorization header format"})
			c.Abort()
			return
		}

		tokenString := tokenParts[1]
		claims, err := jwtService.ValidateToken(tokenString)
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
			c.Abort()
			return
		}

		// Set user information in context
		userID, ok := claims["user_id"].(float64)
		if !ok {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
			c.Abort()
			return
		}

		username, ok := claims["username"].(string)
		if !ok {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
			c.Abort()
			return
		}

		c.Set("user_id", int(userID))
		c.Set("username", username)
		c.Next()
	}
}