using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using BITKit.IO;
using BITKit.UX;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;
using UnityEngine.UIElements;
using YooAsset;
using Debug = UnityEngine.Debug;

namespace BITKit
{
    public class BITFramework : MonoBehaviour
    {
        public static BITFramework Singleton { get; private set; }
        private static System.Diagnostics.Stopwatch Stopwatch;

        [RuntimeInitializeOnLoadMethod]
        private static void Reload()
        {
            Stopwatch = new Stopwatch();
#if UNITY_EDITOR
#else
                SplashScreen.Stop(SplashScreen.StopBehavior.StopImmediate);
#endif
        }

        [SerializeReference, SubclassSelector]  private IReference addressableName;
        [SerializeReference, SubclassSelector] private IReference packageName = new Reference("DefaultPackage");

        [SerializeReference, SubclassSelector] private IRemoteServices remoteServices;
        [SerializeReference, SubclassSelector] private IBuildinQueryServices buildinQueryServices;
        

        [SerializeField] private Optional<string> loadEntryScene;

        [SerializeField] private UIDocument document;

        [SerializeField] private bool isOffline;
        [SerializeField] private bool IsEditorSimulateMode;
        
        [SerializeField] private UnityEvent<Action<float>,Action<string>> afterInitialize=new();
        [SerializeField] private UnityEvent<string> onGetCurrentVersion;

        [UXBindPath("progress-bar",true)]
        private ProgressBar _progressBar;
        [UXBindPath("progress-fill",true)]
        private VisualElement _progressFill;
        [UXBindPath("progress-label")]
        private Label _progressLabel;

        private Action<float> _setProgressValue;
        private Action<string> _setProgressLabel;
        private async void Start()
        {
            Singleton = this;
            try
            {
#if UNITY_EDITOR
#else
            IsEditorSimulateMode = false;
#endif
                UXUtils.Inject(this);

                if (_progressBar is not null)
                {
                    _setProgressValue = value => _progressBar.value = value;
                }else if (_progressFill is not null)
                {
                    _setProgressValue = value =>
                        _progressFill.style.width = new Length() { value = value*100, unit = LengthUnit.Percent };
                }
                _setProgressLabel = value => _progressLabel.text = value;

                _setProgressValue?.Invoke(0f);
                
                _setProgressLabel?.Invoke("正在初始化资源系统...");

                var stopwatch = new Stopwatch();
                stopwatch.Start();
                DontDestroyOnLoad(gameObject);
                // 初始化资源系统
                if (YooAssets.Initialized is false)
                    YooAssets.Initialize();
              
                

                // 创建默认的资源包
                var package = YooAssets.TryGetPackage(packageName.Value) ?? YooAssets.CreatePackage(packageName.Value);

                // 设置该资源包为默认的资源包，可以使用YooAssets相关加载接口加载该资源包内容。
                YooAssets.SetDefaultPackage(package);

                if (package.InitializeStatus is EOperationStatus.Succeed)
                {
                    YooAssets.DestroyPackage(package.PackageName);
                }


                InitializeParameters initParameters = new HostPlayModeParameters
                {
                    BuildinQueryServices = buildinQueryServices,
                    RemoteServices = remoteServices
                };
                if (Application.platform is RuntimePlatform.WebGLPlayer)
                {
                    initParameters = new WebPlayModeParameters()
                    {
                        BuildinQueryServices = buildinQueryServices,
                        RemoteServices = remoteServices
                    };
                }
                #if UNITY_EDITOR
                if (IsEditorSimulateMode)
                {
                    
                    var editorParameters = new EditorSimulateModeParameters
                    {
                        
                        SimulateManifestFilePath =
                            EditorSimulateModeHelper.SimulateBuild("ScriptableBuildPipeline", packageName.Value)
                    };
                    initParameters = editorParameters;
                }
                else
                {
                    switch (UnityEditor.EditorUserBuildSettings.activeBuildTarget)
                    {
                        case UnityEditor.BuildTarget.WebGL:
                            initParameters = new WebPlayModeParameters()
                            {
                                BuildinQueryServices = buildinQueryServices,
                                RemoteServices = remoteServices
                            };
                            break;
                    }
                }
#endif

                if (isOffline&& IsEditorSimulateMode is false)
                {
                    initParameters = new OfflinePlayModeParameters();
                }

                InitializationOperation initOperation = null;
                try
                {
                    initOperation = package.InitializeAsync(initParameters);

                    var text = $"正在初始化资源系统...,使用{initParameters.GetType().Name}";
                    
                        _progressLabel.text =text;
                        
                    Debug.Log(text);
                }
                catch (Exception e)
                {
                        _progressLabel.text =e.Message;

                    initParameters = new HostPlayModeParameters
                    {
                        BuildinQueryServices = buildinQueryServices,
                        RemoteServices = remoteServices
                    };

                    initOperation = package.InitializeAsync(initParameters);
                }

                while (initOperation.IsDone is false)
                {
                    await UniTask.NextFrame(destroyCancellationToken);
                        //_progressBar.value =initOperation.Progress;
                        _setProgressValue?.Invoke(initOperation.Progress);
                }

                try
                {
                    if (isOffline is false)
                    {
                        _progressLabel.text = "正在更新资源包版本...";
                        var operation = package.UpdatePackageVersionAsync();
                        try
                        {
                            onGetCurrentVersion.Invoke(package.GetPackageVersion());
                        }
                        catch (Exception e)
                        {
                            BIT4Log.LogException(e);
                        }

                        while (operation.IsDone is false)
                        {
                            await UniTask.NextFrame(destroyCancellationToken);
                            //_progressBar.value = operation.Progress;
                            _setProgressValue?.Invoke(operation.Progress);
                        }


                        if (operation.Status == EOperationStatus.Succeed)
                        {
                            //更新成功
                            string packageVersion = operation.PackageVersion;
                            Debug.Log($"Updated package Version : {packageVersion}");

                            _progressLabel.text = "正在更新资源包清单...";

                            var manifestOperation = package.UpdatePackageManifestAsync(packageVersion);
                            await manifestOperation.ToUniTask();
                            if (manifestOperation.Status == EOperationStatus.Succeed)
                            {
                                //更新成功
                                int downloadingMaxNum = 10;
                                int failedTryAgain = 3;
                                var downloader = package.CreateResourceDownloader(downloadingMaxNum, failedTryAgain);

                                //没有需要下载的资源
                                if (downloader.TotalDownloadCount != 0)
                                {
                                    //需要下载的文件总数和总大小
                                    int totalDownloadCount = downloader.TotalDownloadCount;
                                    long totalDownloadBytes = downloader.TotalDownloadBytes;
                                    downloader.OnDownloadProgressCallback = (totalDownloadCount, currentDownloadCount,
                                        totalDownloadBytes, currentDownloadBytes) =>
                                    {
                                        BIT4Log.Log<BITFramework>(
                                            $"{totalDownloadCount},{currentDownloadCount},{totalDownloadBytes},{currentDownloadBytes}");
                                        //下载进度
                                        float progress = (float)currentDownloadBytes / totalDownloadBytes;
                                        _setProgressValue?.Invoke(progress);
                                        _setProgressLabel?.Invoke($"{currentDownloadBytes}/{totalDownloadBytes}");
                                    };
                                    downloader.OnDownloadErrorCallback = (fileName, error) =>
                                    {
                                        _setProgressLabel?.Invoke(error);
                                    };


                                    //注册回调方法
                                    // downloader.OnDownloadErrorCallback = OnDownloadErrorFunction;
                                    // downloader.OnDownloadProgressCallback = OnDownloadProgressUpdateFunction;
                                    // downloader.OnDownloadOverCallback = OnDownloadOverFunction;
                                    // downloader.OnStartDownloadFileCallback = OnStartDownloadFileFunction;

                                    //开启下载
                                    downloader.BeginDownload();
                                    await downloader;
                                    //检测下载结果
                                    if (downloader.Status != EOperationStatus.Succeed)
                                    {
                                        //更新失败
                                        Debug.LogError(operation.Error);
                                        _progressLabel.text = operation.Error;
                                    }
                                }
                            }
                            else
                            {
                                //更新失败
                                Debug.LogError(operation.Error);
                                _progressLabel.text = operation.Error;
                            }
                        }
                        else
                        {
                            //更新失败
                            Debug.LogError(operation.Error);
                            _progressLabel.text = operation.Error;
                        }
                    }
                }
                catch (Exception e)
                {
                    BIT4Log.LogException(e);
                    _progressLabel.text = e.Message;
                }

                _setProgressLabel?.Invoke("资源系统初始化完成,后处理中...");
                afterInitialize.Invoke(_setProgressValue,_setProgressLabel);

                _setProgressLabel?.Invoke("资源系统初始化完成,后处理完成");
                
                if (addressableName is not null)
                {
                        _progressLabel.text ="正在初始化Framework";
                    var frameworkHandle = YooAssets.LoadAssetAsync<GameObject>(addressableName.Value);
                    while (frameworkHandle.IsDone is false)
                    {
                        await UniTask.NextFrame(destroyCancellationToken);
                            //_progressBar.value=frameworkHandle.Progress;
                            _setProgressValue?.Invoke(frameworkHandle.Progress);
                    }

                    var framework = Instantiate(frameworkHandle.AssetObject);
                    DontDestroyOnLoad(framework);
                        _progressLabel.text="已加载完成";


                    BIT4Log.Log<BITFramework>("BITFramework加载完成,耗时:" + stopwatch.ElapsedMilliseconds + "ms");
                }

                stopwatch.Stop();
                
                YooAssetUtils.RegisterPackage(packageName.Value);
                YooAssetUtils.RegisterResourcePackage(package);

                await AfterInit(package);
            }
            catch (Exception e)
            {
                await UniTask.SwitchToMainThread();
                    _progressBar.value =0;
                _progressLabel.text = e.Message;
            }
        }

        private async UniTask AfterInit(ResourcePackage package)
        {
            if (loadEntryScene.Allow)
            {
                _progressLabel.text="正在加载场景...";
                try
                {
                    await package.LoadSceneAsync(loadEntryScene.Value);
                    _progressLabel.text="场景加载完成...";
                }
                catch (Exception e)
                {
                    Debug.LogException(e);
                    await UniTask.NextFrame();
                    _progressLabel.text = e.Message;
                }
            }
            else
            {
                _progressLabel.text="未找到默认场景,正在加载场景[1]";
            
                SceneManager.LoadScene(1);
            }
                
            if (document)
                Destroy(document);
        }
        private void OnDestroy()
        {
#if UNITY_EDITOR
        YooAssets.Destroy();
#endif
        }
    }

    [Serializable]
    public sealed class GameQueryServices : IBuildinQueryServices
    {
        public bool Query(string packageName, string fileName)
        {
            // 注意：fileName包含文件格式
            return StreamingAssetsHelper.FileExists(packageName, fileName);
        }

        public bool Query(string packageName, string fileName, string fileCRC)=>Query(packageName,fileName);
    }

    [Serializable]
    public sealed class LocalQueryServices : IBuildinQueryServices
    {
        public readonly string Path;

        public LocalQueryServices(string path)
        {
            Path = path;
        }

        public bool Query(string packageName, string fileName, string fileCRC)
        {
            return File.Exists(System.IO.Path.Combine(Path, fileName));
        }
    }

    /// <summary>
    /// 远端资源地址查询服务类
    /// </summary>
    [Serializable]
    public sealed class RemoteServices : IRemoteServices
    {
        [SerializeField] private string _defaultHostServer;
        [SerializeField] private string _fallbackHostServer;
        public RemoteServices(){}
        public RemoteServices(string defaultHostServer, string fallbackHostServer)
        {
            _defaultHostServer = defaultHostServer;
            _fallbackHostServer = fallbackHostServer;
        }
        string IRemoteServices.GetRemoteMainURL(string fileName)
        {
            return $"{_defaultHostServer}/{fileName}";
        }
        string IRemoteServices.GetRemoteFallbackURL(string fileName)
        {
            return $"{_fallbackHostServer}/{fileName}";
        }
    }
}