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.FSE.Common;
using Tango.FSE.Common.AutoComplete;
using Tango.FSE.Upgrade.Views;

namespace Tango.FSE.Upgrade.ViewModels
{
    public class WelcomeViewVM : RemoteUpgradeViewModel
    {
        private Machine _selectedMachine;
        /// <summary>
        /// Gets or sets the selected machine.
        /// </summary>
        public Machine SelectedMachine
        {
            get { return _selectedMachine; }
            set { _selectedMachine = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private bool _isApplicationUpdate;
        /// <summary>
        /// Gets or sets a value indicating whether to update application and firmware, otherwise only firmware.
        /// </summary>
        public bool IsApplicationUpdate
        {
            get { return _isApplicationUpdate; }
            set { _isApplicationUpdate = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private bool _isUpdateConnectedMachine;
        /// <summary>
        /// Gets or sets a value indicating whether to update the currently connected machine (relevant only on application update).
        /// </summary>
        public bool IsUpdateConnectedMachine
        {
            get { return _isUpdateConnectedMachine; }
            set { _isUpdateConnectedMachine = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        /// <summary>
        /// Gets or sets the start upgrade command.
        /// </summary>
        public RelayCommand StartUpgradeCommand { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="WelcomeViewVM"/> class.
        /// </summary>
        public WelcomeViewVM()
        {
            IsApplicationUpdate = true;
            IsUpdateConnectedMachine = true;
            StartUpgradeCommand = new RelayCommand(StartUpgrade, () => !IsApplicationUpdate || IsUpdateConnectedMachine || SelectedMachine != null);
        }

        public override void OnApplicationStarted()
        {
            base.OnApplicationStarted();
            MachineProvider.MachineConnected += (_, __) => { if (IsVisible) InvalidateIsUpdateConnectedMachine(); };
            MachineProvider.MachineDisconnected += (_, __) => { if (IsVisible) InvalidateIsUpdateConnectedMachine(); };
        }

        private void InvalidateIsUpdateConnectedMachine()
        {
            if (IsUpdateConnectedMachine)
            {
                IsUpdateConnectedMachine = MachineProvider.IsConnected && MachineProvider.ConnectionType.IsRemote();
            }
        }

        /// <summary>
        /// Called before the navigation system has navigated to this VM view.
        /// </summary>
        public override void OnBeforeNavigatedTo()
        {
            base.OnBeforeNavigatedTo();
            InvalidateIsUpdateConnectedMachine();
        }

        private async void StartUpgrade()
        {
            if (IsApplicationUpdate)
            {
                await ModularNavigationManager.NavigateTo<ApplicationUpgradeViewVM.NavigationObject>(Navigation.RemoteUpgradeView.ApplicationUpgradeView, new ApplicationUpgradeViewVM.NavigationObject()
                {
                    ApplicationUpgradeMode = IsUpdateConnectedMachine ? ApplicationUpgradeViewVM.ApplicationUpgradeMode.ConnectedMachine : ApplicationUpgradeViewVM.ApplicationUpgradeMode.OtherMachine,
                    SelectedMachine = IsUpdateConnectedMachine ? MachineProvider.Machine : SelectedMachine
                });
            }
            else
            {
                await ModularNavigationManager.NavigateTo(Navigation.RemoteUpgradeView.FirmwareUpgradeView);
            }
        }
    }
}