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using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Tango.Core.Commands;
using Tango.MachineStudio.Common.Authentication;
using Tango.MachineStudio.Common.Navigation;
using Tango.MachineStudio.Common.Notifications;
using Tango.SharedUI;

namespace Tango.MachineStudio.UI.ViewModels
{
    public class LoginViewVM : ViewModel
    {
        private IAuthenticationProvider _authenticationProvider;
        private INavigationManager _navigationManager;
        private INotificationProvider _notificationProvider;

        private String _email;
        [Required(ErrorMessage = "Email is required")]
        [EmailAddress(ErrorMessage = "Please enter a valid email")]
        public String Email
        {
            get { return _email; }
            set { _email = value; RaisePropertyChangedAuto(); }
        }

        public RelayCommand<String> LoginCommand { get; set; }

        public LoginViewVM(IAuthenticationProvider authenticationProvider, INavigationManager navigationManager, INotificationProvider notificationProvider)
        {
            _notificationProvider = notificationProvider;
            _navigationManager = navigationManager;
            _authenticationProvider = authenticationProvider;
            LoginCommand = new RelayCommand<String>(Login);
        }

        private void Login(String password)
        {
            if (Validate())
            {
                try
                {
                    _authenticationProvider.Login(Email, password);
                    _navigationManager.NavigateTo(NavigationView.MainView);
                }
                catch
                {
                    _notificationProvider.ShowError("Invalid credentials. Please try again.");
                }
            }
        }
    }
}