using Assets.Core;
using Assets.Scenes.Ride.Scripts;
using Assets.Scripts.Apis.Models;
using Cysharp.Threading.Tasks;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;

/// <summary>
/// 异步线程更新ui工具类
/// </summary>
public class Loom : MonoBehaviour
{
    public static int maxThreads = 8;
    static int numThreads;

    private static Loom _current;
    public static Loom Current
    {
        get
        {
            Initialize();
            return _current;
        }
    }
    //####去除Awake
    //  void Awake()  
    //  {  
    //      _current = this;  
    //      initialized = true;  
    //  }  

    static bool initialized;

    //####作为初始化方法自己调用，可在初始化场景调用一次即可
    public static void Initialize()
    {
        if (!initialized)
        {

            if (!Application.isPlaying)
                return;
            initialized = true;
            GameObject g = new GameObject("Loom");
            //####永不销毁
            DontDestroyOnLoad(g);
            _current = g.AddComponent<Loom>();
            MapUDPService.Init();
            MapUDPService.Send(0, App.CurrentUser.Id, new double[] { -1d, -1d }, competitionId: 0);
        }
    }

    private List<Action> _actions = new List<Action>();
    public struct DelayedQueueItem
    {
        public float time;
        public Action action;
    }
    private List<DelayedQueueItem> _delayed = new List<DelayedQueueItem>();

    List<DelayedQueueItem> _currentDelayed = new List<DelayedQueueItem>();

    public static void QueueOnMainThread(Action action)
    {
        QueueOnMainThread(action, 0f);
    }
    public static void QueueOnMainThread(Action action, float time)
    {
        if (time != 0)
        {
            if (Current != null)
            {
                lock (Current._delayed)
                {
                    Current._delayed.Add(new DelayedQueueItem { time = Time.time + time, action = action });
                }
            }
        }
        else
        {
            if (Current != null)
            {
                lock (Current._actions)
                {
                    Current._actions.Add(action);
                }
            }
        }
    }

    public static Thread RunAsync(Action a)
    {
        Initialize();
        while (numThreads >= maxThreads)
        {
            Thread.Sleep(1);
        }
        Interlocked.Increment(ref numThreads);
        ThreadPool.QueueUserWorkItem(RunAction, a);
        return null;
    }

    private static void RunAction(object action)
    {
        try
        {
            ((Action)action)();
        }
        catch
        {
        }
        finally
        {
            Interlocked.Decrement(ref numThreads);
        }

    }


    void OnDisable()
    {
        if (_current == this)
        {

            _current = null;
        }
    }

    List<Action> _currentActions = new List<Action>();

    // Update is called once per frame  
    void Update()
    {
        lock (_actions)
        {
            _currentActions.Clear();
            _currentActions.AddRange(_actions);
            _actions.Clear();
        }
        foreach (var a in _currentActions)
        {
            a();
        }
        lock (_delayed)
        {
            _currentDelayed.Clear();
            _currentDelayed.AddRange(_delayed.Where(d => d.time <= Time.time));
            foreach (var item in _currentDelayed)
                _delayed.Remove(item);
        }
        foreach (var delayed in _currentDelayed)
        {
            delayed.action();
        }

    }

    public static void Dispose()
    {
        if (_current != null)
        {
            initialized = false;
            DestroyImmediate(_current.gameObject);
            _current = null;
        }
    }

    public static Dictionary<string, DownloadInfo> DownloadStack = new Dictionary<string, DownloadInfo>();

    public static async Task DownloadLoadARDataAndVideo(MapRoute route,IProgress<float> progress)
    {
        DownloadStack.Add(route.FileName, new DownloadInfo(route.FileName,route.Name,0, route.Url));

        var path = PFConstants.VideoFolder;
        var localPath = PFConstants.ARFolder;
        var arDataPath = route.ARConfig;
        var videoRoute = route.VideoRoute;
        var cancelToken = new CancellationTokenSource();
        var dataPath = $"{localPath}/{route.Id}";

        Helper.CreateDirectoryIfNotExsit(dataPath);
        Helper.CreateDirectoryIfNotExsit(dataPath);

        await Loom.DownloadToFileAsync(arDataPath, $"{dataPath}/{route.Id}.json");
        await Loom.DownloadToFileAsync(videoRoute, $"{dataPath}/route-{route.Id}.json");
        await Loom.DownloadToFileAsync(route.Url, $"{path}/{route.FileName}", progress, cancelToken);
    }

    /// <summary>
    /// 下载文件到本地（持续存入磁盘减少内存占用）
    /// </summary>
    /// <param name="downloadUrl">文件连接</param>
    /// <param name="fullPath">本地文件全路径</param>
    /// <param name="progress">下载进度</param>
    public static async UniTask<UnityWebRequest> DownloadToFileAsync(string downloadUrl, string fullPath, IProgress<float> progress = null, CancellationTokenSource cancellation = default(CancellationTokenSource))
    {
        var dh = new DownloadHandlerFile(fullPath)
        {
            removeFileOnAbort = true
        };

        var request = UnityWebRequest.Get(downloadUrl);
        request.method = UnityWebRequest.kHttpVerbGET;
        request.downloadHandler = dh;

        return await request.SendWebRequest().ToUniTask(progress, PlayerLoopTiming.Update, (cancellation?.Token ?? default(CancellationToken)));
    }
}