using System.IO;
using System.Net.Http;
using System.Text;
using System.Windows;
using System.Windows.Threading;
using Azaion.Annotator;
using Azaion.Common;
using Azaion.Common.Database;
using Azaion.Common.DTO;
using Azaion.Common.DTO.Config;
using Azaion.Common.Events;
using Azaion.Common.Extensions;
using Azaion.Common.Services;
using Azaion.Dataset;
using CommandLine;
using LibVLCSharp.Shared;
using MediatR;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using Serilog;
using KeyEventArgs = System.Windows.Input.KeyEventArgs;

namespace Azaion.Suite;

public partial class App
{
    private IMediator _mediator = null!;
    private FormState _formState = null!;
    private IHost _host = null!;
    private static readonly Guid KeyPressTaskId = Guid.NewGuid();
    private LoaderClient _loaderClient = null!;

    private readonly ICache _cache = new MemoryCache();
    private readonly CancellationTokenSource _mainCTokenSource = new();

    private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
    {
        Log.Logger.Error(e.Exception, "Unhandled exception");
        e.Handled = true;
    }

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        Log.Logger = new LoggerConfiguration()
            .Enrich.FromLogContext()
            .MinimumLevel.Information()
            .WriteTo.Console()
            .WriteTo.File(
                path: "Logs/log.txt",
                rollingInterval: RollingInterval.Day)
            .CreateLogger();

        Parser.Default.ParseArguments<ApiCredentials>(e.Args)
            .WithParsed(Start)
            .WithNotParsed(ErrorHandling);
    }

    private void ErrorHandling(IEnumerable<Error> obj)
    {
        Log.Fatal($"Error happened: {string.Join(",", obj.Select(x =>
        {
            if (x is MissingRequiredOptionError err)
                return $"{err.Tag} {err.NameInfo.NameText}";
            return x.Tag.ToString();
        } ))}");
        Current.Shutdown();
    }

    private Stream GetSystemConfig(LoaderClient loaderClient, string apiDir)
    {
        try
        {
            return loaderClient.LoadFile("config.system.json", apiDir);
        }
        catch (Exception e)
        {
            Log.Logger.Error(e, e.Message);
            return new MemoryStream(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new
            {
                AnnotationConfig = Constants.DefaultAnnotationConfig,
                AIRecognitionConfig = Constants.DefaultAIRecognitionConfig,
                ThumbnailConfig = Constants.DefaultThumbnailConfig,
            })));
        }
    }

    private Stream GetSecuredConfig(LoaderClient loaderClient, string apiDir)
    {
        try
        {
            return loaderClient.LoadFile("config.secured.json", apiDir);
        }
        catch (Exception e)
        {
            Log.Logger.Error(e, e.Message);
            throw;
        }
    }

    private void Start(ApiCredentials credentials)
    {
        try
        {
            new ConfigUpdater().CheckConfig();
            var initConfig = SecurityConstants.ReadInitConfig(Log.Logger);
            var apiDir = initConfig.DirectoriesConfig.ApiResourcesDirectory;
            _loaderClient = new LoaderClient(initConfig.LoaderClientConfig, Log.Logger, _mainCTokenSource.Token);

            _loaderClient.StartClient();
            _loaderClient.Connect();
            _loaderClient.Login(credentials);

            var azaionApi = new AzaionApi(Log.Logger, new HttpClient { BaseAddress = new Uri(initConfig.InferenceClientConfig.ApiUrl) }, _cache, credentials);

            _host = Host.CreateDefaultBuilder()
                .ConfigureAppConfiguration((_, config) => config
                    .AddCommandLine(Environment.GetCommandLineArgs())
                    .AddJsonFile(SecurityConstants.CONFIG_PATH, optional: true, reloadOnChange: true)
                    .AddJsonStream(GetSystemConfig(_loaderClient, apiDir))
                    .AddJsonStream(GetSecuredConfig(_loaderClient, apiDir)))
                .UseSerilog()
                .ConfigureServices((context, services) =>
                {
                    services.AddSingleton<MainSuite>();

                    services.Configure<AppConfig>(context.Configuration);
                    services.ConfigureSection<QueueConfig>(context.Configuration);
                    services.ConfigureSection<DirectoriesConfig>(context.Configuration);
                    services.ConfigureSection<AnnotationConfig>(context.Configuration);
                    services.ConfigureSection<AIRecognitionConfig>(context.Configuration);
                    services.ConfigureSection<ThumbnailConfig>(context.Configuration);
                    services.ConfigureSection<UIConfig>(context.Configuration);
                    services.ConfigureSection<MapConfig>(context.Configuration);

                    #region External Services

                    services.ConfigureSection<LoaderClientConfig>(context.Configuration);
                    services.AddSingleton(_loaderClient);

                    services.ConfigureSection<InferenceClientConfig>(context.Configuration);
                    services.AddSingleton<IInferenceClient, InferenceClient>();
                    services.AddSingleton<IInferenceService, InferenceService>();

                    services.ConfigureSection<GpsDeniedClientConfig>(context.Configuration);
                    services.AddSingleton<IGpsMatcherClient, GpsMatcherClient>();
                    services.AddSingleton<IGpsMatcherService, GpsMatcherService>();
                    services.AddSingleton<ISatelliteDownloader, SatelliteDownloader>();

                    services.AddHttpClient();
                    services.AddSingleton<IAzaionApi>(azaionApi);
                    #endregion

                    services.AddSingleton<IConfigUpdater, ConfigUpdater>();
                    services.AddSingleton<Annotator.Annotator>();
                    services.AddSingleton<DatasetExplorer>();
                    services.AddSingleton<HelpWindow>();
                    services.AddMediatR(c => c.RegisterServicesFromAssemblies(
                        typeof(Annotator.Annotator).Assembly,
                        typeof(DatasetExplorer).Assembly,
                        typeof(AnnotationService).Assembly));
                    services.AddSingleton<LibVLC>(_ => new LibVLC());
                    services.AddSingleton<FormState>();
                    services.AddSingleton<MediaPlayer>(sp =>
                    {
                        var libVLC = sp.GetRequiredService<LibVLC>();
                        return new MediaPlayer(libVLC);
                    });
                    services.AddSingleton<AnnotatorEventHandler>();
                    services.AddSingleton<IDbFactory, DbFactory>();

                    services.AddSingleton<FailsafeAnnotationsProducer>();

                    services.AddSingleton<IAnnotationService, AnnotationService>();

                    services.AddSingleton<DatasetExplorer>();
                    services.AddSingleton<IGalleryService, GalleryService>();

                    services.AddSingleton<IAzaionModule, AnnotatorModule>();
                    services.AddSingleton<IAzaionModule, DatasetExplorerModule>();
                })
                .Build();

            Annotation.InitializeDirs(_host.Services.GetRequiredService<IOptions<DirectoriesConfig>>().Value);
            _host.Services.GetRequiredService<DatasetExplorer>();
            // datasetExplorer.Show();
            // datasetExplorer.Hide();

            _mediator = _host.Services.GetRequiredService<IMediator>();

            _formState = _host.Services.GetRequiredService<FormState>();
            DispatcherUnhandledException += OnDispatcherUnhandledException;

            _host.Start();
            EventManager.RegisterClassHandler(typeof(UIElement), UIElement.PreviewKeyDownEvent, new RoutedEventHandler(GlobalKeyHandler));
            _host.Services.GetRequiredService<MainSuite>().Show();
        }
        catch (Exception e)
        {
            Log.Logger.Error(e, e.Message);
            throw;
        }
    }

    private void GlobalKeyHandler(object sender, RoutedEventArgs e)
    {
        var args = (KeyEventArgs)e;
        var keyEvent = new KeyEvent(sender, args, _formState.ActiveWindow);
        ThrottleExt.Throttle(() => _mediator.Publish(keyEvent, _mainCTokenSource.Token), KeyPressTaskId, TimeSpan.FromMilliseconds(50));
        //e.Handled = true;
    }

    protected override async void OnExit(ExitEventArgs e)
    {
        base.OnExit(e);
        _loaderClient.Stop();
        _loaderClient.Dispose();
        await _host.StopAsync();
    }
}