package utils

import (
	"errors"
	"time"

	"cardverse/config"

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

type Claims struct {
	UserID uint   `json:"user_id"`
	Email  string `json:"email,omitempty"`
	Role   string `json:"role,omitempty"`
	jwt.RegisteredClaims
}

func GenerateAccessToken(userID uint, email string, role string) (string, error) {
	cfg := config.Cfg
	expiration := time.Now().Add(time.Duration(cfg.JWTExpiresHours) * time.Hour)

	claims := Claims{
		UserID: userID,
		Email:  email,
		Role:   role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(expiration),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString([]byte(cfg.JWTSecret))
}

func GenerateRefreshToken(userID uint) (string, error) {
	cfg := config.Cfg
	expiration := time.Now().Add(time.Duration(cfg.JWTRefreshExpiresHours) * time.Hour)

	claims := Claims{
		UserID: userID,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(expiration),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString([]byte(cfg.JWTRefreshSecret))
}

func GenerateToken(userID uint, email string, role string) (string, error) {
	return GenerateAccessToken(userID, email, role)
}

func ValidateToken(tokenString string) (*Claims, error) {
	cfg := config.Cfg
	claims := &Claims{}

	token, err := jwt.ParseWithClaims(tokenString, claims, func(t *jwt.Token) (interface{}, error) {
		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, errors.New("metode signing token tidak valid")
		}
		return []byte(cfg.JWTSecret), nil
	})
	if err != nil {
		return nil, err
	}
	if !token.Valid {
		return nil, errors.New("token tidak valid")
	}

	return claims, nil
}

func ValidateRefreshToken(tokenString string) (*Claims, error) {
	cfg := config.Cfg
	claims := &Claims{}

	token, err := jwt.ParseWithClaims(tokenString, claims, func(t *jwt.Token) (interface{}, error) {
		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, errors.New("metode signing token tidak valid")
		}
		return []byte(cfg.JWTRefreshSecret), nil
	})
	if err != nil {
		return nil, err
	}
	if !token.Valid {
		return nil, errors.New("refresh token tidak valid")
	}

	return claims, nil
}