package auth

import (
	"time"

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

var jwtSecret []byte

func SetJWTSecret(secret string) {
	jwtSecret = []byte(secret)
}

func GetJWTSecret() []byte {
	return jwtSecret
}

type Claims struct {
	UserID   int64  `json:"user_id"`
	Email    string `json:"email"`
	Username string `json:"username"`
	IsAdmin  bool   `json:"is_admin"`
	jwt.RegisteredClaims
}

func GenerateToken(userID int64, email, username string, isAdmin bool) (string, error) {
	expirationTime := time.Now().Add(24 * time.Hour)
	claims := &Claims{
		UserID:   userID,
		Email:    email,
		Username: username,
		IsAdmin:  isAdmin,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(expirationTime),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}

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

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

	if err != nil || !token.Valid {
		return nil, err
	}

	return claims, nil
}