using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Avalonia.Media.Imaging;
using DownKyi.Core.BiliApi.History;
using DownKyi.Core.BiliApi.VideoStream;
using DownKyi.Core.Storage;
using DownKyi.Events;
using DownKyi.Images;
using DownKyi.PrismExtension.Dialog;
using DownKyi.Services;
using DownKyi.Services.Download;
using DownKyi.Utils;
using DownKyi.ViewModels.PageViewModels;
using Prism.Commands;
using Prism.Events;
using Prism.Regions;

namespace DownKyi.ViewModels;

public class ViewMyToViewVideoViewModel : ViewModelBase
{
    public const string Tag = "PageMyToView";

    private CancellationTokenSource tokenSource;

    #region 页面属性申明

    private string pageName = Tag;

    public string PageName
    {
        get => pageName;
        set => SetProperty(ref pageName, value);
    }

    private VectorImage arrowBack;

    public VectorImage ArrowBack
    {
        get => arrowBack;
        set => SetProperty(ref arrowBack, value);
    }

    private VectorImage downloadManage;

    public VectorImage DownloadManage
    {
        get => downloadManage;
        set => SetProperty(ref downloadManage, value);
    }

    private bool contentVisibility;

    public bool ContentVisibility
    {
        get => contentVisibility;
        set => SetProperty(ref contentVisibility, value);
    }

    private ObservableCollection<ToViewMedia> medias;

    public ObservableCollection<ToViewMedia> Medias
    {
        get => medias;
        set => SetProperty(ref medias, value);
    }

    private bool isSelectAll;

    public bool IsSelectAll
    {
        get => isSelectAll;
        set => SetProperty(ref isSelectAll, value);
    }

    private bool loading;

    public bool Loading
    {
        get => loading;
        set => SetProperty(ref loading, value);
    }

    private bool loadingVisibility;

    public bool LoadingVisibility
    {
        get => loadingVisibility;
        set => SetProperty(ref loadingVisibility, value);
    }

    private bool noDataVisibility;

    public bool NoDataVisibility
    {
        get => noDataVisibility;
        set => SetProperty(ref noDataVisibility, value);
    }

    #endregion

    public ViewMyToViewVideoViewModel(IEventAggregator eventAggregator, IDialogService dialogService) : base(
        eventAggregator)
    {
        this.DialogService = dialogService;

        #region 属性初始化

        // 初始化loading
        Loading = true;
        LoadingVisibility = false;
        NoDataVisibility = false;

        ArrowBack = NavigationIcon.Instance().ArrowBack;
        ArrowBack.Fill = DictionaryResource.GetColor("ColorTextDark");

        // 下载管理按钮
        DownloadManage = ButtonIcon.Instance().DownloadManage;
        DownloadManage.Height = 24;
        DownloadManage.Width = 24;
        DownloadManage.Fill = DictionaryResource.GetColor("ColorPrimary");

        Medias = new ObservableCollection<ToViewMedia>();

        #endregion
    }

    #region 命令申明

    // 返回事件
    private DelegateCommand backSpaceCommand;

    public DelegateCommand BackSpaceCommand =>
        backSpaceCommand ?? (backSpaceCommand = new DelegateCommand(ExecuteBackSpace));

    /// <summary>
    /// 返回事件
    /// </summary>
    private void ExecuteBackSpace()
    {
        InitView();

        ArrowBack.Fill = DictionaryResource.GetColor("ColorText");

        // 结束任务
        tokenSource?.Cancel();

        NavigationParam parameter = new NavigationParam
        {
            ViewName = ParentView,
            ParentViewName = null,
            Parameter = null
        };
        EventAggregator.GetEvent<NavigationEvent>().Publish(parameter);
    }

    // 前往下载管理页面
    private DelegateCommand downloadManagerCommand;

    public DelegateCommand DownloadManagerCommand => downloadManagerCommand ??
                                                     (downloadManagerCommand =
                                                         new DelegateCommand(ExecuteDownloadManagerCommand));

    /// <summary>
    /// 前往下载管理页面
    /// </summary>
    private void ExecuteDownloadManagerCommand()
    {
        NavigationParam parameter = new NavigationParam
        {
            ViewName = ViewDownloadManagerViewModel.Tag,
            ParentViewName = Tag,
            Parameter = null
        };
        EventAggregator.GetEvent<NavigationEvent>().Publish(parameter);
    }

    // 全选按钮点击事件
    private DelegateCommand<object> selectAllCommand;

    public DelegateCommand<object> SelectAllCommand =>
        selectAllCommand ?? (selectAllCommand = new DelegateCommand<object>(ExecuteSelectAllCommand));

    /// <summary>
    /// 全选按钮点击事件
    /// </summary>
    /// <param name="parameter"></param>
    private void ExecuteSelectAllCommand(object parameter)
    {
        if (IsSelectAll)
        {
            foreach (var item in Medias)
            {
                item.IsSelected = true;
            }
        }
        else
        {
            foreach (var item in Medias)
            {
                item.IsSelected = false;
            }
        }
    }

    // 列表选择事件
    private DelegateCommand<object> mediasCommand;

    public DelegateCommand<object> MediasCommand =>
        mediasCommand ?? (mediasCommand = new DelegateCommand<object>(ExecuteMediasCommand));

    /// <summary>
    /// 列表选择事件
    /// </summary>
    /// <param name="parameter"></param>
    private void ExecuteMediasCommand(object parameter)
    {
        if (!(parameter is IList selectedMedia))
        {
            return;
        }

        if (selectedMedia.Count == Medias.Count)
        {
            IsSelectAll = true;
        }
        else
        {
            IsSelectAll = false;
        }
    }

    // 添加选中项到下载列表事件
    private DelegateCommand addToDownloadCommand;

    public DelegateCommand AddToDownloadCommand => addToDownloadCommand ??
                                                   (addToDownloadCommand =
                                                       new DelegateCommand(ExecuteAddToDownloadCommand));

    /// <summary>
    /// 添加选中项到下载列表事件
    /// </summary>
    private void ExecuteAddToDownloadCommand()
    {
        AddToDownload(true);
    }

    // 添加所有视频到下载列表事件
    private DelegateCommand addAllToDownloadCommand;

    public DelegateCommand AddAllToDownloadCommand => addAllToDownloadCommand ??
                                                      (addAllToDownloadCommand =
                                                          new DelegateCommand(ExecuteAddAllToDownloadCommand));

    /// <summary>
    /// 添加所有视频到下载列表事件
    /// </summary>
    private void ExecuteAddAllToDownloadCommand()
    {
        AddToDownload(false);
    }

    #endregion

    /// <summary>
    /// 添加到下载
    /// </summary>
    /// <param name="isOnlySelected"></param>
    private async void AddToDownload(bool isOnlySelected)
    {
        // 稍后再看里只有视频
        AddToDownloadService addToDownloadService = new AddToDownloadService(PlayStreamType.VIDEO);

        // 选择文件夹
        string directory = await addToDownloadService.SetDirectory(DialogService);

        // 视频计数
        int i = 0;
        await Task.Run(async () =>
        {
            // 为了避免执行其他操作时，
            // Medias变化导致的异常
            var list = Medias.ToList();

            // 添加到下载
            foreach (var media in list)
            {
                // 只下载选中项，跳过未选中项
                if (isOnlySelected && !media.IsSelected)
                {
                    continue;
                }

                /// 有分P的就下载全部

                // 开启服务
                VideoInfoService videoInfoService = new VideoInfoService(media.Bvid);

                addToDownloadService.SetVideoInfoService(videoInfoService);
                addToDownloadService.GetVideo();
                addToDownloadService.ParseVideo(videoInfoService);
                // 下载
                i += await addToDownloadService.AddToDownload(EventAggregator, DialogService, directory);
            }
        });

        if (directory == null)
        {
            return;
        }

        // 通知用户添加到下载列表的结果
        if (i <= 0)
        {
            EventAggregator.GetEvent<MessageEvent>().Publish(DictionaryResource.GetString("TipAddDownloadingZero"));
        }
        else
        {
            EventAggregator.GetEvent<MessageEvent>()
                .Publish(
                    $"{DictionaryResource.GetString("TipAddDownloadingFinished1")}{i}{DictionaryResource.GetString("TipAddDownloadingFinished2")}");
        }
    }

    private async void UpdateToViewMediaList()
    {
        LoadingVisibility = true;
        NoDataVisibility = false;
        Medias.Clear();

        await Task.Run(() =>
        {
            CancellationToken cancellationToken = tokenSource.Token;

            var toViewList = ToView.GetToView();
            if (toViewList == null || toViewList.Count == 0)
            {
                LoadingVisibility = false;
                NoDataVisibility = true;
                return;
            }

            foreach (var toView in toViewList)
            {
                // 查询、保存封面
                string coverUrl = toView.Pic;
                Bitmap cover;
                if (coverUrl == null || coverUrl == "")
                {
                    cover = null;
                }
                else
                {
                    if (!coverUrl.ToLower().StartsWith("http"))
                    {
                        coverUrl = $"https:{toView.Pic}";
                    }

                    StorageCover storageCover = new StorageCover();
                    cover = storageCover.GetCoverThumbnail(toView.Aid, toView.Bvid, toView.Cid, coverUrl, 160, 100);
                }

                // 获取用户头像
                long upMid = -1;
                string upName;
                Bitmap upHeader;
                if (toView.Owner != null && toView.Owner.Face != null)
                {
                    upMid = toView.Owner.Mid;
                    upName = toView.Owner.Name;
                    StorageHeader storageHeader = new StorageHeader();
                    upHeader = storageHeader.GetHeaderThumbnail(toView.Owner.Mid, upName, toView.Owner.Face, 24, 24);
                }
                else
                {
                    upName = "";
                    upHeader = null;
                }

                App.PropertyChangeAsync(() =>
                {
                    ToViewMedia media = new ToViewMedia(EventAggregator)
                    {
                        Aid = toView.Aid,
                        Bvid = toView.Bvid,
                        UpMid = upMid,
                        Cover = cover ??
                                ImageHelper.LoadFromResource(
                                    new Uri($"avares://DownKyi/Resources/video-placeholder.png")),
                        Title = toView.Title,
                        UpName = upName,
                        UpHeader = upHeader
                    };

                    Medias.Add(media);

                    ContentVisibility = true;
                    LoadingVisibility = false;
                    NoDataVisibility = false;
                });

                // 判断是否该结束线程，若为true，跳出循环
                if (cancellationToken.IsCancellationRequested)
                {
                    break;
                }
            }
        }, (tokenSource = new CancellationTokenSource()).Token);
    }

    /// <summary>
    /// 初始化页面数据
    /// </summary>
    private void InitView()
    {
        ArrowBack.Fill = DictionaryResource.GetColor("ColorTextDark");

        ContentVisibility = false;
        LoadingVisibility = false;
        NoDataVisibility = false;

        Medias.Clear();
        IsSelectAll = false;
    }

    /// <summary>
    /// 导航到页面时执行
    /// </summary>
    /// <param name="navigationContext"></param>
    public override void OnNavigatedTo(NavigationContext navigationContext)
    {
        base.OnNavigatedTo(navigationContext);

        ArrowBack.Fill = DictionaryResource.GetColor("ColorTextDark");

        DownloadManage = ButtonIcon.Instance().DownloadManage;
        DownloadManage.Height = 24;
        DownloadManage.Width = 24;
        DownloadManage.Fill = DictionaryResource.GetColor("ColorPrimary");

        // 根据传入参数不同执行不同任务
        long mid = navigationContext.Parameters.GetValue<long>("Parameter");
        if (mid == 0)
        {
            IsSelectAll = false;
            foreach (var media in Medias)
            {
                media.IsSelected = false;
            }

            return;
        }

        InitView();

        UpdateToViewMediaList();
    }
}