import { BaseViewModel } from '../../ui/BaseViewModel';
import { StateFlow } from '../../ui/StateFlow';
import { AuthRepository } from '../repository/AuthRepository';
import { AuthRemoteDataSource } from '../datasource/remote/AuthRemoteDataSource';
import { AuthLocalDataSourceImpl } from '../datasource/local/AuthLocalDataSourceImpl';
import { LoginState } from './LoginState';

/**
 * 登录ViewModel
 * 
 * 与 Android 版本保持一致的 API 和结构
 */
export class LoginViewModel extends BaseViewModel {
  private authRepository: AuthRepository;
  
  // 使用 StateFlow 管理状态（与 Android 版本一致）
  private _loginState = new StateFlow<LoginState>(LoginState.Idle);
  loginState: StateFlow<LoginState> = this._loginState;
  
  private static readonly MIN_PASSWORD_LENGTH = 6;
  private static readonly MAX_PASSWORD_LENGTH = 16;
  
  constructor() {
    super();
    // 初始化 Repository
    this.authRepository = new AuthRepository(
      new AuthRemoteDataSource(),
      new AuthLocalDataSourceImpl()
    );
  }
  
  /**
   * 登录
   * 
   * @param mobile 手机号
   * @param password 密码
   */
  async login(mobile: string, password: string): Promise<void> {
    this._loginState.value = LoginState.Loading;
    
    // 输入验证
    if (!mobile || mobile.trim() === '') {
      this._loginState.value = LoginState.Error('手机号不能为空');
      return;
    }
    
    if (password.length < LoginViewModel.MIN_PASSWORD_LENGTH || 
        password.length > LoginViewModel.MAX_PASSWORD_LENGTH) {
      this._loginState.value = LoginState.Error(
        `密码长度应为${LoginViewModel.MIN_PASSWORD_LENGTH}-${LoginViewModel.MAX_PASSWORD_LENGTH}位`
      );
      return;
    }
    
    try {
      const result = await this.authRepository.login(mobile, password);
      
      if (result.isSuccess) {
        this._loginState.value = LoginState.Success('登录成功');
      } else {
        const error = result.exceptionOrNull();
        this._loginState.value = LoginState.Error(
          error?.message || '登录失败'
        );
      }
    } catch (error) {
      this._loginState.value = LoginState.Error(
        (error as Error).message || '登录失败'
      );
    }
  }
}