package middleware

import (
	"net/http"
	"strings"
	"time"

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

var jwtKey = []byte("your_secret_key")

type Claims struct {
	UserID int32 `json:"user_id"`
	jwt.RegisteredClaims
}

func AuthMiddleware() 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
		}

		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
		if tokenString == authHeader {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Bearer token required"})
			c.Abort()
			return
		}

		claims := &Claims{}
		token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
			return jwtKey, nil
		})

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

		c.Set("user_id", claims.UserID)
		c.Set("email", claims.Subject)
		c.Next()
	}
}

func GenerateToken(userID int32, email string) (string, error) {
	expirationTime := 24 * time.Hour
	claims := &Claims{
		UserID: userID,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(expirationTime)),
			Subject:   email,
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString(jwtKey)
}