Video: playback, pause and seeking

using System;
using Reckfell;

public partial class VideoDemo : Control
{
    [Export(PropertyHint.File,"*.ogv")] public string VideoPath { get; set; } = "asset://Clips/recording-slate.ogv";
    public VideoStreamPlayer Video { get; private set; } = null!;
    public Label Status { get; private set; } = null!;
    public Button PauseButton { get; private set; } = null!;
    public int FinishedCount { get; private set; }
    private bool _russian;
    private string Text(string ru,string en) => _russian ? ru : en;

    public override void _Ready()
    {
        _russian=TranslationServer.GetLocale().StartsWith("ru",StringComparison.OrdinalIgnoreCase);
        SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect);
        var layout=new VBoxContainer { Name="Layout" }; AddChild(layout); layout.SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect);
        var aspect=new AspectRatioContainer
        {
            Name="Aspect",Ratio=16f/9,StretchMode=AspectRatioContainer.StretchModeEnum.Fit,
            SizeFlagsVertical=SizeFlags.ExpandFill
        };
        Video=new VideoStreamPlayer { Name="Video",Expand=true,Autoplay=false,Loop=false };
        layout.AddChild(aspect); aspect.AddChild(Video);
        var buttons=new HBoxContainer { Name="Buttons" }; layout.AddChild(buttons);
        var play=new Button { Name="PlayButton",Text=Text("Запустить","Play") };
        PauseButton=new Button { Name="PauseButton",Text=Text("Пауза","Pause") };
        var stop=new Button { Name="StopButton",Text=Text("Остановить","Stop") };
        buttons.AddChild(play); buttons.AddChild(PauseButton); buttons.AddChild(stop);
        Status=new Label { Name="Status",Text=Text("Готово к запуску","Ready") }; layout.AddChild(Status);
        play.Pressed+=() => ShowResult(LoadAndPlay());
        PauseButton.Pressed+=TogglePause;
        stop.Pressed+=StopVideo;
        Video.Finished+=() =>
        {
            FinishedCount++;
            Status.Text=Text("Воспроизведение завершено","Finished");
            PauseButton.Text=Text("Пауза","Pause");
        };
    }

    public Error LoadAndPlay()
    {
        if (!IsInsideTree()) return Error.Unconfigured;
        if (!FileAccess.FileExists(VideoPath)) return Error.FileNotFound;
        if (!VideoPath.EndsWith(".ogv",StringComparison.OrdinalIgnoreCase)) return Error.Unavailable;
        var stream=ResourceLoader.Load<VideoStream>(VideoPath);
        if (stream is null) return Error.FileUnrecognized;
        Video.Paused=false; Video.Stream=stream; Video.Play();
        PauseButton.Text=Text("Пауза","Pause");
        Status.Text=Text("Воспроизведение","Playing");
        return Error.Ok;
    }

    private void ShowResult(Error error)
    {
        if (error != Error.Ok) Status.Text=$"{Text("Ошибка","Error")}: {error}";
    }

    public void TogglePause()
    {
        if (!Video.IsPlaying()) return;
        Video.Paused=!Video.Paused;
        PauseButton.Text=Video.Paused ? Text("Продолжить","Resume") : Text("Пауза","Pause");
        Status.Text=Video.Paused ? Text("Пауза","Paused") : Text("Воспроизведение","Playing");
    }

    public void StopVideo()
    {
        Video.Stop(); Video.Paused=false;
        PauseButton.Text=Text("Пауза","Pause"); Status.Text=Text("Остановлено","Stopped");
    }

    public Error SeekTo(double seconds)
    {
        double length=Video.GetStreamLength();
        if (!double.IsFinite(seconds) || seconds<0 || length<=0 || seconds>=length) return Error.InvalidParameter;
        Video.StreamPosition=seconds;
        return Error.Ok;
    }
}