package utils

import (
	"time"

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

var jwtSecret []byte

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

type Claims struct {
	UserID string `json:"userId"`
	Email  string `json:"email"`
	Role   string `json:"role"`
	Type   string `json:"type"`
	jwt.RegisteredClaims
}

func EncodeJWT(payload map[string]interface{}, expiresInSeconds int) (string, error) {
	now := time.Now()
	claims := jwt.MapClaims{
		"iat": now.Unix(),
		"exp": now.Add(time.Duration(expiresInSeconds) * time.Second).Unix(),
	}
	for k, v := range payload {
		claims[k] = v
	}

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

func DecodeJWT(tokenString string) (jwt.MapClaims, error) {
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, jwt.ErrSignatureInvalid
		}
		return jwtSecret, nil
	})

	if err != nil {
		return nil, err
	}

	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
		return claims, nil
	}

	return nil, jwt.ErrSignatureInvalid
}