using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using Microsoft.Extensions.Logging;
using ReactiveUI;
using Wabbajack.Common;
using Wabbajack.Lib;
using Wabbajack.Lib.Interventions;

namespace Wabbajack
{
    public class UserInterventionHandlers
    {
        public MainWindowVM MainWindow { get; }
        private AsyncLock _browserLock = new();
        private readonly ILogger<UserInterventionHandlers> _logger;

        public UserInterventionHandlers(ILogger<UserInterventionHandlers> logger, MainWindowVM mvm)
        {
            _logger = logger;
            MainWindow = mvm;
        }

        private async Task WrapBrowserJob(IUserIntervention intervention, Func<WebBrowserVM, CancellationTokenSource, Task> toDo)
        {
            var wait = await _browserLock.WaitAsync();
            var cancel = new CancellationTokenSource();
            var oldPane = MainWindow.ActivePane;
            using var vm = await WebBrowserVM.GetNew(_logger);
            MainWindow.NavigateTo(vm);
            vm.BackCommand = ReactiveCommand.Create(() =>
            {
                cancel.Cancel();
                MainWindow.NavigateTo(oldPane);
                intervention.Cancel();
            });

            try
            {
                await toDo(vm, cancel);
            }
            catch (TaskCanceledException)
            {
                intervention.Cancel();
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "During Web browser job");
                intervention.Cancel();
            }
            finally
            {
                wait.Dispose();
            }

            MainWindow.NavigateTo(oldPane);
        }

        public async Task Handle(IStatusMessage msg)
        {
            switch (msg)
            {
                /*
                case RequestNexusAuthorization c:
                    await WrapBrowserJob(c, async (vm, cancel) =>
                    {
                        await vm.Driver.WaitForInitialized();
                        var key = await NexusApiClient.SetupNexusLogin(new CefSharpWrapper(vm.Browser), m => vm.Instructions = m, cancel.Token);
                        c.Resume(key);
                    });
                    break;
                case ManuallyDownloadNexusFile c:
                    await WrapBrowserJob(c, (vm, cancel) => HandleManualNexusDownload(vm, cancel, c));
                    break;
                case ManuallyDownloadFile c:
                    await WrapBrowserJob(c, (vm, cancel) => HandleManualDownload(vm, cancel, c));
                    break;
                case AbstractNeedsLoginDownloader.RequestSiteLogin c:
                    await WrapBrowserJob(c, async (vm, cancel) =>
                    {
                        await vm.Driver.WaitForInitialized();
                        var data = await c.Downloader.GetAndCacheCookies(new CefSharpWrapper(vm.Browser), m => vm.Instructions = m, cancel.Token);
                        c.Resume(data);
                    });
                    break;
                case RequestOAuthLogin oa:
                    await WrapBrowserJob(oa, async (vm, cancel) =>
                    {
                        await OAuthLogin(oa, vm, cancel);
                    });


                    break;
                    */
                case CriticalFailureIntervention c:
                    MessageBox.Show(c.ExtendedDescription, c.ShortDescription, MessageBoxButton.OK,
                        MessageBoxImage.Error);
                    c.Cancel();
                    if (c.ExitApplication) await MainWindow.ShutdownApplication();
                    break;
                case ConfirmationIntervention c:
                    break;
                default:
                    throw new NotImplementedException($"No handler for {msg}");
            }
        }
        
    }
}