using Godot;
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;
using BITKit;
using BITKit.IO;
using Microsoft.Extensions.DependencyInjection;
using Cysharp.Threading.Tasks;

namespace BITKit.UX;

public partial class PlaybackService : UXPanel
{
    [Export] private string path;
    [Export] private Node root;
    [Export] private Label label;
    [Export] private PackedScene template;
    [Export] private PackedScene labelTemplate;
    [Export] private DataPlayer dataPlayer;
    private CancellationTokenSource cancellationTokenSource;
    public PlaybackService()
    {
        BITApp.ServiceCollection.AddSingleton(this);
    }

    public override void _Ready()
    {
        cancellationTokenSource = new CancellationTokenSource();
        //OnExit();
    }
    public override void _ExitTree()
    {
        cancellationTokenSource.Cancel();
    }
    private void NoEntry()
    //public override void OnEntry()
    {
        cancellationTokenSource.Token.ThrowIfCancellationRequested();
        
        var files =
            new DirectoryInfo(PathHelper.GetFolderPath("Demos", GetTree().CurrentScene.Name))
                .GetFiles()
                .Where(x => x.Extension is ".demo");
            ;
            
        foreach (var x in files)
        {
            var playableInfo = BITAssets.ReadAs<PlayableInfo>(x.FullName);
            var instance = template.Instantiate<Button>();
            instance.Text = playableInfo.Name;
            root.AddChild(instance);

            instance.Pressed += OnClick;

            async void OnClick()
            {
                BIT4Log.Log<PlaybackService>($"正在播放:{playableInfo.Name}");
                
                Stopwatch stopwatch = new();
                stopwatch.Start();
                
                //OnExit();
                label.Text = $"正在加载:{playableInfo.Name},创建时间:{playableInfo.CreateTime}";
                label.Show();
                
                await UniTask.SwitchToTaskPool();
                
                var array = BITAssets.Read<string[]>(x.FullName, "base64");

                try
                {
                    await UniTask.SwitchToSynchronizationContext(BITApp.SynchronizationContext,
                        cancellationTokenSource.Token);
                }
                catch (OperationCanceledException)
                {
                    stopwatch.Stop();
                    return;
                }
                
                stopwatch.Stop();
                
                BIT4Log.Log<PlaybackService>($"已加载:{playableInfo.Name},耗时:{stopwatch.ElapsedMilliseconds}ms");
                
                dataPlayer.Play(array);

                label.Text = $"已加载,耗时{stopwatch.ElapsedMilliseconds}ms,点击任意位置返回";
                
                BIT4Log.Log<PlaybackService>($"正在播放:{playableInfo.Name}");
            }
        }
    }
    private void NoExit()
    //public override void OnExit()
    {
        foreach (var x in root.GetChildren())
        {
            x.QueueFree();
        }
        label.Hide();
    }
}