using Microsoft.Practices.ServiceLocation;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.Core.Helpers;
using Tango.MachineStudio.Common.StudioApplication;
using Tango.MachineStudio.Common.Navigation;
using GalaSoft.MvvmLight.Ioc;
using System.Reflection;
using System.Collections;
using Tango.Integration.Services;
using Tango.Core;
using Tango.Logging;

namespace Tango.MachineStudio.UI.StudioApplication
{
    public class DefaultStudioApplicationManager : ExtendedObject, IStudioApplicationManager
    {
        private INavigationManager _navigationManager;

        public DefaultStudioApplicationManager(INavigationManager navigationManager)
        {
            _navigationManager = navigationManager;
        }

        public bool IsShuttingDown { get; private set; }

        private IExternalBridgeClient _connectedMachine;

        public IExternalBridgeClient ConnectedMachine
        {
            get { return _connectedMachine; }
            set
            {
                _connectedMachine = value;
                RaisePropertyChangedAuto();
                RaisePropertyChanged(nameof(IsMachineConnected));
                RaisePropertyChanged(nameof(IsMachineConnectedViaTCP));

                if (_connectedMachine != null)
                {
                    _connectedMachine.StateChanged -= ConnectedMachine_StateChanged;
                    _connectedMachine.StateChanged += ConnectedMachine_StateChanged;
                }
            }
        }

        public bool IsMachineConnectedViaTCP
        {
            get { return IsMachineConnected && ConnectedMachine.Type != ExternalBridgeClientType.USB; }
        }

        private void ConnectedMachine_StateChanged(object sender, Transport.TransportComponentState e)
        {
            if (e == Transport.TransportComponentState.Disconnected || e == Transport.TransportComponentState.Failed)
            {
                ConnectedMachine = null;
            }

        }

        public bool IsMachineConnected
        {
            get { return ConnectedMachine != null; }
        }

        public async void ShutDown()
        {
            if (IsShuttingDown) return;

            IsShuttingDown = true;

            await Task.Factory.StartNew(async () =>
            {
                try
                {
                    if (ConnectedMachine != null)
                    {
                        ConnectedMachine.Disconnect().Wait();
                    }
                }
                catch (Exception ex)
                {
                    LogManager.Log(ex, "Error disconnecting from machine.");
                }

                //Do Shutdown Procedures...
                foreach (var vm in ServiceLocator.Current.GetAllInstancesByBase<IShutdownRequestBlocker>())
                {
                    var result = await vm.OnShutdownRequest();
                    if (!result)
                    {
                        IsShuttingDown = false;
                        return;
                    }
                }

                _navigationManager.NavigateTo(NavigationView.ShutdownView);
                Thread.Sleep(3000);
                Environment.Exit(0);

            });
        }
    }
}