Txgy.EWS.Client/Txgy.EWS.Client.Start/ViewModels/LoginViewModel.cs

using Prism.Commands;
using Prism.Events;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Security.Principal;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Windows;
using System.Windows.Shapes;
using Txgy.EWS.Client.Common.Extensions;
using Txgy.EWS.Client.Entity;
using Txgy.EWS.Client.Models;
using Txgy.EWS.Client.IBLL;
using Txgy.EWS.Client.Common.MessageEvents;
using System.Windows.Threading;
using Txgy.EWS.Client.Common;
using Txgy.EWS.Client.ILog;

namespace Txgy.EWS.Client.Start.ViewModels
{
    public class LoginViewModel : BindableBase
    {
        #region 属性        
        ILogHelper _logHelper;
        public DelegateCommand CancelLoadingCommand { get => new DelegateCommand(() => IsLoading = false); }
        private bool _isLoading;

        public bool IsLoading
        {
            get { return _isLoading; }
            set { SetProperty(ref _isLoading, value); }
        }
        private bool _isCanLoading = false;

        public bool IsCanLoading
        {
            get { return _isCanLoading; }
            set 
            { 
                SetProperty(ref _isCanLoading, value);
                
            }
        }

        private string _loadingMessage;

        public string LoadingMessage
        {
            get { return _loadingMessage; }
            set { SetProperty(ref _loadingMessage, value); }
        }

        private string _userName = "yuwu";

        public string UserName
        {
            get { return _userName; }
            set { SetProperty(ref _userName, value); }
        }

        private string _password = "123456";

        public string Password
        {
            get { return _password; }
            set { SetProperty(ref _password, value); }
        }

        private string _errorMsg;

        public string ErrorMsg
        {
            get { return _errorMsg; }
            set { SetProperty(ref _errorMsg, value); }
        }
        #endregion
        private DelegateCommand<object> _loginCommand;
        public ICommand LoginCommand
        {
            get
            {
                if (_loginCommand == null)
                {
                    _loginCommand = new DelegateCommand<object>(OnLogin, CanLogin);
                }
                return _loginCommand;
            }
        }

        private bool CanLogin(object arg)
        {
            return IsCanLoading;
        }

        private async void OnLogin(object obj)
        {
            if (IsCanLoading)
            {
                try
                {                    
                    IsCanLoading = false;
                    RaisePropertyChanged(nameof(IsCanLoading));
                    this.ErrorMsg = "";
                    if (string.IsNullOrEmpty(this.UserName))
                    {
                        this.ErrorMsg = "请输入用户名";
                        return;
                    }
                    if (string.IsNullOrEmpty(this.Password))
                    {
                        this.ErrorMsg = "请输入密码";
                        return;
                    }
                    this.IsLoading = true;
                    this.LoadingMessage = "正在登录";
                    // 请求WebAPI
                    await Task.Delay(1000);
                    if (await _loginBLL.Login(this.UserName, this.Password))
                    {
                        _logHelper.Debug(this, $"{this.UserName}登录");
                        (obj as Window).DialogResult = true;
                    }
                    else
                    {
                        // 提示错误
                        this.ErrorMsg = "用户名或密码错误，请重新输入";
                        this.IsLoading = false;
                    }
                }
                catch (Exception ex)
                {
                    _logHelper.Error(this, ex.Message);
                    //ex.StackTrace;
                    //ex.Message;
                    // 消息提示
                    MessageBox.Show("登录失败！");
                }
            }

        }
        //GlobalEntity _globalEntity = null;
        IUpgradeFileBLL _systemBLL = null;
        ILoginBLL _loginBLL = null;
        public LoginViewModel(
            IContainerProvider containerProvider,
            IEventAggregator ea,
            IUpgradeFileBLL systemBLL,
            ILoginBLL loginBLL,ILogHelper logHelper)
        {
            if (GlobalConfig.IsDesign)
            {
                this.UserName = "admin";
                this.Password = "123";
            }
            //_globalEntity = containerProvider.Resolve<GlobalEntity>();
            _systemBLL = systemBLL;
            _loginBLL = loginBLL;
            _logHelper = logHelper;

            // 应用启动时开始检查程序版本
            this.IsLoading = true;
                this.LoadingMessage = "正在检查软件版本";
                Task.Run(async () =>
                {
                    await Task.Delay(2000);
                    try
                    {
                        var result = await _systemBLL.DiffFileListAsync();
                        if (result.Count > 0)
                        {
                            // 需要更新的时候，启动更新程序，关闭主程序
                            this.LoadingMessage = "发现新版本";
                            Process process = Process.Start(
                                "Txgy.EWS.Client.Upgrade.exe",
                                string.Join(" ", result.ToArray())
                                );
                            process.WaitForInputIdle();

                            ea.GetEvent<CloseWindowEvent>().Publish();
                        }
                        this.LoadingMessage = "已是最新版本";
                        //CommandManager.InvalidateRequerySuggested();
                        // 否则的话开始执行登录 
                        this.IsLoading = false;
                        this.IsCanLoading = true;
                        _loginCommand.RaiseCanExecuteChanged();
                    }
                    catch (Exception)
                    {
                        MessageBox.Show("系统检查更新失败！");
                    }
                });
            

        }
    }
}