using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using SbLauncher;

public static class UiStress
{
    [STAThread]
    public static int Main()
    {
        var app = new Application();
        app.ShutdownMode = ShutdownMode.OnExplicitShutdown;
        var sourceRoot = AppDomain.CurrentDomain.BaseDirectory;
        var dataRoot = Environment.GetEnvironmentVariable("SB_STRESS_ROOT");
        if (string.IsNullOrEmpty(dataRoot)) dataRoot = sourceRoot;
        var window = (Window)XamlReader.Parse(File.ReadAllText(Path.Combine(sourceRoot, "Ui.xaml")));
        var vm = new MainVm();
        window.DataContext = vm;
        vm.ThemeApplier = delegate(string theme) { Theme.Apply(window, theme); };
        vm.Load(new Paths(dataRoot));
        vm.SetTheme(Theme.Dark);
        // Подключаем переходы вкладок без сетевых действий основного Wire.
        typeof(SbLauncher.App).GetMethod("WireTabs", BindingFlags.Static | BindingFlags.NonPublic)
            .Invoke(null, new object[] { window, vm });
        var stopwatch = Stopwatch.StartNew();
        long previous = 0, longest = 0;
        int ticks = 0;
        bool cleared = false;
        var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(50) };
        timer.Tick += delegate
        {
            long now = stopwatch.ElapsedMilliseconds;
            if (previous != 0) longest = Math.Max(longest, now - previous);
            previous = now;
            ticks++;
            vm.ShowSettings = !vm.ShowSettings;
            vm.SetTheme(ticks % 2 == 0 ? Theme.Dark : Theme.Light);
            // Оставляем каждую фазу на несколько кадров, чтобы реально
            // проверить запуск и остановку Storyboard при нагрузке.
            if (ticks % 10 == 0)
                vm.ConnectionPhase = new[] { "connecting", "connected", "disconnecting", "idle" }[(ticks / 10) % 4];
            if (ticks == 32 && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("SB_STRESS_SCREENSHOT")))
            {
                vm.SetTheme(Theme.Light);
                Capture(window, Environment.GetEnvironmentVariable("SB_STRESS_SCREENSHOT"));
            }
            if (ticks == 20)
            {
                vm.ClearLogCommand.Execute(null);
                cleared = vm.LogText.Length == 0;
            }
            if (now >= 5000) { timer.Stop(); app.Shutdown(); }
        };
        window.Show();
        timer.Start();
        Task.Run(delegate
        {
            for (int i = 0; i < 20000; i++) vm.AppendLog("stress line " + i);
        });
        app.Run();
        vm.DisposeTimers();
        Console.WriteLine("UI ticks: " + ticks + ", max interval: " + longest +
                          " ms, log length: " + vm.LogText.Length + ", clear: " + cleared);
        return ticks >= 30 && longest < 500 && vm.LogText.Length <= 50000 && cleared ? 0 : 1;
    }

    static void Capture(Window window, string path)
    {
        window.UpdateLayout();
        var bmp = new RenderTargetBitmap((int)window.Width, (int)window.Height,
            96, 96, PixelFormats.Pbgra32);
        bmp.Render((Visual)window.Content);
        var encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(bmp));
        using (var stream = new FileStream(path, FileMode.Create)) encoder.Save(stream);
    }
}