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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Core.Commands;
using Tango.Core.Cryptography;
using Tango.FSE.Common;
using Tango.FSE.Common.Navigation;
using Tango.FSE.Common.Notifications;
using Tango.MachineService.Gateway;
namespace Tango.FSE.UI.ViewModels
{
public class LoginViewVM : FSEViewModel
{
private Rfc2898Cryptographer _cryptography;
public enum LoginViews
{
Login,
Logging
}
private LoginViews _selectedView;
public LoginViews SelectedView
{
get { return _selectedView; }
set { _selectedView = value; RaisePropertyChangedAuto(); }
}
private String _email;
[EmailAddress(ErrorMessage = "Please enter a valid email address")]
public String Email
{
get { return _email; }
set { _email = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
}
private String _password;
[Required(ErrorMessage = "Password is required")]
public String Password
{
get { return _password; }
set { _password = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
}
private bool _rememberMe;
public bool RememberMe
{
get { return _rememberMe; }
set { _rememberMe = value; RaisePropertyChangedAuto(); }
}
private EnvironmentConfiguration _selectedEnvironment;
public EnvironmentConfiguration SelectedEnvironment
{
get { return _selectedEnvironment; }
set { _selectedEnvironment = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
}
private String _status;
public String Status
{
get { return _status; }
set { _status = value; RaisePropertyChangedAuto(); }
}
public RelayCommand LoginCommand { get; set; }
public LoginViewVM()
{
_cryptography = new Rfc2898Cryptographer();
LoginCommand = new RelayCommand(Login, () => Email.IsNotNullOrEmpty() && Password.IsNotNullOrEmpty() && SelectedEnvironment != null);
}
public override void OnApplicationStarted()
{
}
public override void OnNavigatedTo()
{
base.OnNavigatedTo();
SelectedEnvironment = GatewayService.Environments.FirstOrDefault(x => x.MachineServiceAddress == Settings.MachineServiceAddress);
if (SelectedEnvironment == null)
{
SelectedEnvironment = GatewayService.Environments.FirstOrDefault();
}
Email = Settings.LastLoginEmail;
if (Settings.LastLoginPassword.IsNotNullOrEmpty())
{
Password = _cryptography.Decrypt(Settings.LastLoginPassword);
}
RememberMe = Settings.RememberMe;
if (!Email.IsNotNullOrEmpty())
{
this.SetFocus(() => Email);
}
else if (!Password.IsNotNullOrEmpty())
{
this.SetFocus(() => Password);
}
}
private async void Login()
{
try
{
if (!Validate())
{
return;
}
IsFree = false;
SelectedView = LoginViews.Logging;
var result = await AuthenticationProvider.Login(Email, Password, SelectedEnvironment);
Settings.LastLoginEmail = Email;
Settings.RememberMe = RememberMe;
if (RememberMe)
{
Settings.LastLoginPassword = _cryptography.Encrypt(Password);
}
else
{
Settings.LastLoginPassword = null;
}
Settings.Save();
Status = "Loading static collections...";
await Task.Factory.StartNew(() =>
{
ObservablesStaticCollections.Instance.Initialize((msg) =>
{
Status = msg;
});
});
Status = "Starting application...";
await Task.Delay(500);
if (!result.Response.PasswordChangeRequired)
{
await NavigationManager.NavigateTo(NavigationView.Home);
}
}
catch (Exception ex)
{
IsFree = true;
SelectedView = LoginViews.Login;
await NotificationProvider.ShowError(ex.GetFirstIfAggregate().Message);
}
finally
{
IsFree = true;
}
}
}
}
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