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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.Commands;
using Tango.Integration.ExternalBridge;
using Tango.SharedUI;

namespace Tango.FSE.UI.Panes
{
    public class MachineConnectionPaneVM : ViewModel
    {
        private ExternalBridgeScanner _scanner;

        public event EventHandler<IExternalBridgeClient> MachineSelected;

        public ObservableCollection<ExternalBridgeUsbClient> UsbMachines { get; set; }

        public ObservableCollection<ExternalBridgeTcpClient> TcpMachines { get; set; }

        public ObservableCollection<ExternalBridgeSignalRClient> SignalRMachines { get; set; }

        public RelayCommand ConnectToMachineCommand { get; set; }

        private IExternalBridgeClient _selectedMachine;
        public IExternalBridgeClient SelectedMachine
        {
            get { return _selectedMachine; }
            set { _selectedMachine = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        public MachineConnectionPaneVM()
        {
            ConnectToMachineCommand = new RelayCommand(ConnectToMachine, () => SelectedMachine != null);

            UsbMachines = new ObservableCollection<ExternalBridgeUsbClient>();
            TcpMachines = new ObservableCollection<ExternalBridgeTcpClient>();
            SignalRMachines = new ObservableCollection<ExternalBridgeSignalRClient>();

            _scanner = new ExternalBridgeScanner();
            _scanner.MachineDiscovered += _scanner_MachineDiscovered;
            _scanner.MachineLost += _scanner_MachineLost;
        }

        internal void ConnectToMachine()
        {
            if (SelectedMachine != null)
            {
                MachineSelected?.Invoke(this, SelectedMachine);
            }
        }

        private void _scanner_MachineLost(object sender, IExternalBridgeClient machine)
        {
            InvokeUI(() =>
            {
                if (machine is ExternalBridgeUsbClient)
                {
                    UsbMachines.Remove(machine as ExternalBridgeUsbClient);
                }
                else if (machine is ExternalBridgeTcpClient)
                {
                    TcpMachines.Remove(machine as ExternalBridgeTcpClient);
                }
                else if (machine is ExternalBridgeSignalRClient)
                {
                    SignalRMachines.Remove(machine as ExternalBridgeSignalRClient);
                }
            });
        }

        private void _scanner_MachineDiscovered(object sender, IExternalBridgeClient machine)
        {
            InvokeUI(() =>
            {
                if (machine is ExternalBridgeUsbClient)
                {
                    UsbMachines.Add(machine as ExternalBridgeUsbClient);
                }
                else if (machine is ExternalBridgeTcpClient)
                {
                    TcpMachines.Add(machine as ExternalBridgeTcpClient);
                }
                else if (machine is ExternalBridgeSignalRClient)
                {
                    SignalRMachines.Add(machine as ExternalBridgeSignalRClient);
                }
            });
        }

        public void Start()
        {
            TcpMachines.Clear();
            SignalRMachines.Clear();
            SelectedMachine = null;

            _scanner.Start();
        }

        public void Stop()
        {
            _scanner.Stop();
        }
    }
}