package crypto

import (
	"time"

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

// JWTConfig holds JWT configuration
type JWTConfig struct {
	Secret           []byte
	ExpiryHours      int
	RefreshExpiryHours int
}

// GenerateToken creates a new JWT access token
func GenerateToken(cfg JWTConfig, userID uint, email string, userType string) (string, error) {
	claims := jwt.MapClaims{
		"user_id":  userID,
		"email":    email,
		"type":     userType,
		"exp":      time.Now().Add(time.Duration(cfg.ExpiryHours) * time.Hour).Unix(),
		"iat":      time.Now().Unix(),
	}

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

// ValidateToken validates and parses a JWT token
func ValidateToken(cfg JWTConfig, 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 cfg.Secret, nil
	})

	if err != nil {
		return nil, err
	}

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

	return nil, jwt.ErrSignatureInvalid
}