package service

import (
	"errors"
	
	"golang.org/x/crypto/bcrypt"
	
	"newaterobot-process/entity"
	"newaterobot-process/model"
)

// UserService 用户服务
type UserService struct {
	userModel *model.UserModel
}

// NewUserService 创建用户服务实例
func NewUserService() *UserService {
	return &UserService{
		userModel: &model.UserModel{},
	}
}

// Register 用户注册
func (s *UserService) Register(username, password, email, nickname string) (*entity.User, error) {
	// 检查用户名是否已存在
	_, err := s.userModel.GetByUsername(username)
	if err == nil {
		return nil, errors.New("用户名已存在")
	}

	// 密码加密
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return nil, err
	}

	// 创建用户
	user := &entity.User{
		Username: username,
		Password: string(hashedPassword),
		Email:    email,
		Nickname: nickname,
		Status:   1,
	}

	err = s.userModel.Create(user)
	if err != nil {
		return nil, err
	}

	return user, nil
}

// Login 用户登录
func (s *UserService) Login(username, password string) (string, error) {
	// 获取用户信息
	user, err := s.userModel.GetByUsername(username)
	if err != nil {
		return "", errors.New("用户名或密码错误")
	}

	// 验证密码
	err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password))
	if err != nil {
		return "", errors.New("用户名或密码错误")
	}

	// 生成token
	token, err := GetJWTService().GenerateToken(user.ID, user.Username)
	if err != nil {
		return "", err
	}

	return token, nil
}

// GetUserByID 根据ID获取用户信息
func (s *UserService) GetUserByID(id uint) (*entity.User, error) {
	return s.userModel.GetByID(id)
}