package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"github.com/troneras/ghost-listmonk-connector/services"
	"github.com/troneras/ghost-listmonk-connector/utils"
)

func AuthRequired(userService *services.UserService) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			utils.ErrorLogger.Println("Authorization header is required")
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header is required"})
			c.Abort()
			return
		}

		bearerToken := strings.Split(authHeader, " ")
		if len(bearerToken) != 2 {
			utils.ErrorLogger.Println("Invalid token format")
			c.JSON(http.StatusUnauthorized, gin.H{"error": "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, jwt.ErrSignatureInvalid
			}
			return []byte(utils.GetConfig().JWT_SECRET), nil
		})

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

		if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
			userID, ok := claims["user_id"].(string)
			if !ok {
				utils.ErrorLogger.Println("Invalid user_id in token claims")
				c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
				c.Abort()
				return
			}

			user, err := userService.GetUserByID(userID)
			if err != nil {
				utils.ErrorLogger.Printf("Failed to get user: %v", err)
				c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid user"})
				c.Abort()
				return
			}

			c.Set("user", user)
			c.Next()
		} else {
			utils.ErrorLogger.Println("Invalid token claims")
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
			c.Abort()
			return
		}
	}
}