using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Threading;
using SbLauncher;

// Exercises real WPF animation clocks, including interruption and settling.
// Synthetic view model only: no local settings, network, or sing-box process.
public static class ThemeTransitions
{
    [STAThread]
    public static int Main(string[] args)
    {
        var app = new Application { ShutdownMode = ShutdownMode.OnExplicitShutdown };
        Window window = null;
        var vm = new MainVm();
        try
        {
            string root = args.Length > 0 ? args[0] : AppDomain.CurrentDomain.BaseDirectory;
            window = (Window)XamlReader.Parse(File.ReadAllText(Path.Combine(root, "Ui.xaml")));
            window.DataContext = vm;
            vm.ThemeApplier = delegate(string theme) { Theme.Apply(window, theme); };
            vm.SetTheme(Theme.Dark);
            var dark = (ResourceDictionary)window.Resources["Theme.Dark"];
            var light = (ResourceDictionary)window.Resources["Theme.Light"];
            var sun = (TextBlock)window.FindName("ThemeSun");
            var moon = (TextBlock)window.FindName("ThemeMoon");
            Color darkText = ((SolidColorBrush)dark["Text"]).Color;
            Color lightText = ((SolidColorBrush)light["Text"]).Color;
            Require(SameColor(TextColor(window), darkText) && sun.Opacity == 1 && moon.Opacity == 0,
                    "Startup is immediate and shows the correct icon");
            vm.SetTheme(Theme.Light);
            Require(SameColor(TextColor(window), lightText) && sun.Opacity == 0 && moon.Opacity == 1,
                    "Unloaded screenshot rendering is immediate in both themes");
            vm.SetTheme(Theme.Dark);

            window.WindowStartupLocation = WindowStartupLocation.Manual;
            window.Left = -20000;
            window.Top = -20000;
            window.ShowInTaskbar = false;
            window.ShowActivated = false;
            window.Show();
            PumpFor(100);
            vm.SetTheme(Theme.Light);
            Require(object.ReferenceEquals(window.Resources["Muted"], Application.Current.Resources["Muted"]),
                    "Semantic colors and XAML share the transition brushes");
            if (SystemParameters.ClientAreaAnimation)
            {
                Require(SameColor(TextColor(window), darkText), "No initial palette flash");
                PumpFor(170);
                Color halfway = TextColor(window);
                Require(!SameColor(halfway, darkText) && !SameColor(halfway, lightText), "Text colors interpolate");
                Require(sun.Opacity > 0 && sun.Opacity < 1 && moon.Opacity > 0 && moon.Opacity < 1,
                        "Both icons participate in the crossfade");
                var sunTransform = (TransformGroup)sun.RenderTransform;
                Require(((RotateTransform)sunTransform.Children[1]).Angle != 0 &&
                        ((ScaleTransform)sunTransform.Children[0]).ScaleX < 1,
                        "Outgoing icon rotates and scales");
                var background = (GradientBrush)window.Resources["Bg"];
                Color middleStop = background.GradientStops[0].Color;
                double sunOpacity = sun.Opacity;
                vm.SetTheme(Theme.Dark);
                Require(SameColor(TextColor(window), halfway) &&
                        SameColor(((GradientBrush)window.Resources["Bg"]).GradientStops[0].Color, middleStop) &&
                        Math.Abs(sun.Opacity - sunOpacity) < 0.001,
                        "Reversal continues from current colors and icon position");
            }
            else Require(SameColor(TextColor(window), lightText) && moon.Opacity == 1,
                         "Windows reduced animation preference is respected");

            for (int i = 0; i < 12; i++)
            {
                vm.SetTheme(i % 2 == 0 ? Theme.Light : Theme.Dark);
                PumpFor(35);
            }
            vm.SetTheme(Theme.Light);
            PumpFor(650);
            Require(SameColor(TextColor(window), lightText) && sun.Opacity == 0 && moon.Opacity == 1,
                    "Latest request wins after rapid switching");
            Require(vm.ThemeAction == "Включить тёмную тему", "Accessible action matches the destination");
            CheckPalette(window, light);
            vm.SetTheme(Theme.Dark);
            PumpFor(650);
            Require(SameColor(TextColor(window), darkText) && sun.Opacity == 1 && moon.Opacity == 0,
                    "Reverse transition reaches its exact final state");
            CheckPalette(window, dark);
            Require(((SolidColorBrush)dark["Text"]).Color == darkText &&
                    ((SolidColorBrush)light["Text"]).Color == lightText &&
                    !((SolidColorBrush)dark["Text"]).HasAnimatedProperties &&
                    !((SolidColorBrush)light["Text"]).HasAnimatedProperties,
                    "Source palettes are unchanged");
            Console.WriteLine("Theme transition checks passed.");
            return 0;
        }
        catch (Exception ex) { Console.Error.WriteLine(ex); return 1; }
        finally
        {
            vm.DisposeTimers();
            if (window != null) window.Close();
            app.Shutdown();
        }
    }

    static Color TextColor(Window window) { return ((SolidColorBrush)window.Resources["Text"]).Color; }

    // ColorAnimation interpolates in scRGB; compare the rendered 8-bit channels
    // rather than exact floating-point equality with XAML's sRGB representation.
    static bool SameColor(Color a, Color b) { return a.A == b.A && a.R == b.R && a.G == b.G && a.B == b.B; }

    static void CheckPalette(Window window, ResourceDictionary expected)
    {
        foreach (object key in expected.Keys)
        {
            var solid = expected[key] as SolidColorBrush;
            if (solid != null)
                Require(SameColor(((SolidColorBrush)window.Resources[key]).Color, solid.Color), "Final color: " + key);
            var gradient = expected[key] as GradientBrush;
            if (gradient != null)
            {
                var actual = (GradientBrush)window.Resources[key];
                for (int i = 0; i < gradient.GradientStops.Count; i++)
                    Require(SameColor(actual.GradientStops[i].Color, gradient.GradientStops[i].Color) &&
                            actual.GradientStops[i].Offset == gradient.GradientStops[i].Offset,
                            "Final gradient: " + key + " / " + i);
            }
        }
    }

    static void PumpFor(int milliseconds)
    {
        var frame = new DispatcherFrame();
        var timer = new DispatcherTimer(DispatcherPriority.Background) { Interval = TimeSpan.FromMilliseconds(milliseconds) };
        timer.Tick += delegate { timer.Stop(); frame.Continue = false; };
        timer.Start();
        Dispatcher.PushFrame(frame);
    }

    static void Require(bool condition, string message)
    {
        if (!condition) throw new InvalidOperationException(message);
        Console.WriteLine("PASS " + message);
    }
}