// service/auth_service.go
package service

import (
	"errors"
	
	"go-rest-api/internal/models"
	"go-rest-api/internal/repository"
)

type AuthService interface {
	Register(user *models.User) error
	Login(email, password string) (*models.User, string, error)
	GetUserProfile(userID uint) (*models.User, error)
}

type authService struct {
	userRepo  repository.UserRepository
	jwtService JWTService
}

func NewAuthService(userRepo repository.UserRepository, jwtService JWTService) AuthService {
	return &authService{
		userRepo:  userRepo,
		jwtService: jwtService,
	}
}

func (s *authService) Register(user *models.User) error {
	// Проверяем, существует ли пользователь
	existingUser, err := s.userRepo.FindByEmail(user.Email)
	if err == nil && existingUser != nil {
		return errors.New("user with this email already exists")
	}

	// Валидация обязательных полей
	if user.FirstName == "" {
		return errors.New("first name is required")
	}
	if user.LastName == "" {
		return errors.New("last name is required")
	}
	if user.Email == "" {
		return errors.New("email is required")
	}
	if user.Password == "" {
		return errors.New("password is required")
	}
	if len(user.Password) < 6 {
		return errors.New("password must be at least 6 characters")
	}
	
	// Хешируем пароль (будет вызван в BeforeCreate hook)
	// if err := user.HashPassword(); err != nil {
	// 	return err
	// }
	
	return s.userRepo.Create(user)
}

func (s *authService) Login(email, password string) (*models.User, string, error) {
	user, err := s.userRepo.FindByEmail(email)
	if err != nil {
		return nil, "", errors.New("invalid email or password")
	}
	
	if !user.CheckPassword(password) {
		return nil, "", errors.New("invalid email or password")
	}
	
	token, err := s.jwtService.GenerateToken(user.ID, user.Email)
	if err != nil {
		return nil, "", err
	}
	
	return user, token, nil
}

func (s *authService) GetUserProfile(userID uint) (*models.User, error) {
	return s.userRepo.FindByID(userID)
}