using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Core;
using Tango.Core.DI;
using Tango.Core.Helpers;
using Tango.PPC.Common;
using Tango.PPC.Common.Application;
using Tango.PPC.Common.Authentication;
using Tango.PPC.Common.MachineSetup;
using Tango.PPC.Common.Modules;
using Tango.PPC.Common.Navigation;
using Tango.PPC.Common.Notifications;
using Tango.PPC.Common.Notifications.NotificationItems;
using Tango.PPC.Jobs;
using Tango.SharedUI;

namespace Tango.PPC.UI.ViewModels
{
    /// <summary>
    /// Represents the PPC loading splash screen view model.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel" />
    public class LoadingViewVM : PPCViewModel, INavigationObjectReceiver<MachineSetupResult>
    {
        private bool _setup;
        private SetupRequiredEventArgs _setupArgs;
        private bool _post_setup;

        /// <summary>
        /// Gets or sets the module loader.
        /// </summary>
        [TangoInject]
        public IPPCModuleLoader ModuleLoader { get; set; }

        private bool _isLoading;
        /// <summary>
        /// Gets or sets a value indicating whether this instance is loading.
        /// </summary>
        public bool IsLoading
        {
            get { return _isLoading; }
            set { _isLoading = value; RaisePropertyChangedAuto(); }
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="LoadingViewVM"/> class.
        /// </summary>
        public LoadingViewVM(IPPCApplicationManager applicationManager)
        {
            if (!DesignMode)
            {
                applicationManager.SetupRequired += ApplicationManager_SetupRequired;
                Task.Delay(1000).ContinueWith((x) => { IsLoading = true; });
            }
        }

        private void ApplicationManager_SetupRequired(object sender, SetupRequiredEventArgs e)
        {
            _setupArgs = e;
            _setup = true;
            NavigationManager.NavigateTo(NavigationView.MachineSetupView);
        }

        /// <summary>
        /// Called when the application has been started.
        /// </summary>
        public override void OnApplicationStarted()
        {
            IsLoading = false;

            if (!_setup || _post_setup)
            {
                NavigationManager.NavigateTo(NavigationView.LoginView);
            }
        }

        public async void OnNavigatedToWithObject(MachineSetupResult machineSetupResult)
        {
            if (machineSetupResult.Completed)
            {
                _post_setup = true;
                _setup = false;
                IsLoading = true;

                await Task.Delay(500);
                _setupArgs.Continue();
            }
        }
    }
}