using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL.Entities;
using Tango.Core.Commands;
using Tango.Core.DI;
using Tango.Integration.ExternalBridge;
using Tango.PPC.Common;
using Tango.PPC.Common.ExternalBridge;
using Tango.PPC.Common.Navigation;

namespace Tango.PPC.UI.ViewModels
{
    [TangoCreateWhenRegistered]
    public class ExternalBridgeViewVM : PPCViewModel
    {
        private bool _disconnecting;

        private ExternalBridgeClientConnectedEventArgs _connection;
        public ExternalBridgeClientConnectedEventArgs Connection
        {
            get { return _connection; }
            set { _connection = value; RaisePropertyChangedAuto(); }
        }

        private User _user;
        public User User
        {
            get { return _user; }
            set { _user = value;  RaisePropertyChangedAuto(); }
        }

        public RelayCommand CloseSessionCommand { get; set; }

        public ExternalBridgeViewVM()
        {
            CloseSessionCommand = new RelayCommand(CloseSession,() => !_disconnecting);
        }

        private void CloseSession()
        {
            _disconnecting = true;
            InvalidateRelayCommands();
            ExternalBridgeService.DisconnectSession();
        }

        public override void OnNavigatedTo()
        {
            base.OnNavigatedTo();

            _disconnecting = false;
            InvalidateRelayCommands();
        }

        public override void OnApplicationStarted()
        {
            ExternalBridgeService.ConnectionRequest += ExternalBridgeService_ClientConnected;
            ExternalBridgeService.ClientDisconnected += ExternalBridgeService_ClientDisconnected;
        }

        private void ExternalBridgeService_ClientDisconnected(object sender, EventArgs e)
        {
            InvokeUI(() =>
            {
                NavigationManager.NavigateTo(NavigationView.HomeModule);
            });
        }

        private void ExternalBridgeService_ClientConnected(object sender, ExternalBridgeClientConnectedEventArgs e)
        {
            if (e.Request.Password == MachineProvider.Machine.ExternalBridgePassword)
            {
                e.Confirmed = true;

                Connection = e;

                User = Adapter.Users.SingleOrDefault(x => x.Guid == e.Request.UserGuid);

                InvokeUI(() =>
                {
                    NavigationManager.NavigateTo(NavigationView.ExternalBridgeView, false);
                });
            }
        }
    }
}