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using DownKyi.Core.BiliApi.VideoStream;
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using DownKyi.Core.Storage;
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using DownKyi.Core.Utils;
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using DownKyi.CustomControl;
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using DownKyi.Events;
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using DownKyi.Images;
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using DownKyi.Services;
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using DownKyi.Services.Download;
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using DownKyi.Utils;
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using DownKyi.ViewModels.PageViewModels;
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using Prism.Commands;
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using Prism.Events;
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using Prism.Regions;
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using Prism.Services.Dialogs;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Media.Imaging;
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namespace DownKyi.ViewModels
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{
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public class ViewChannelViewModel : BaseViewModel
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{
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public const string Tag = "PageChannel";
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private readonly IDialogService dialogService;
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private CancellationTokenSource tokenSource;
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private long mid = -1;
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private long cid = -1;
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// 每页视频数量，暂时在此写死，以后在设置中增加选项
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private readonly int VideoNumberInPage = 30;
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#region 页面属性申明
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private string pageName = Tag;
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public string PageName
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{
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get => pageName;
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set => SetProperty(ref pageName, value);
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}
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private GifImage loading;
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public GifImage Loading
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{
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get => loading;
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set => SetProperty(ref loading, value);
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}
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private Visibility loadingVisibility;
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public Visibility LoadingVisibility
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{
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get => loadingVisibility;
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set => SetProperty(ref loadingVisibility, value);
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}
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private Visibility noDataVisibility;
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public Visibility NoDataVisibility
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{
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get => noDataVisibility;
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set => SetProperty(ref noDataVisibility, value);
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}
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private VectorImage arrowBack;
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public VectorImage ArrowBack
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{
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get => arrowBack;
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set => SetProperty(ref arrowBack, value);
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}
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private string title;
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public string Title
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{
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get => title;
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set => SetProperty(ref title, value);
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}
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private bool isEnabled = true;
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public bool IsEnabled
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{
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get => isEnabled;
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set => SetProperty(ref isEnabled, value);
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}
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private CustomPagerViewModel pager;
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public CustomPagerViewModel Pager
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{
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get => pager;
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set => SetProperty(ref pager, value);
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}
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private ObservableCollection<ChannelMedia> medias;
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public ObservableCollection<ChannelMedia> Medias
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{
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get => medias;
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set => SetProperty(ref medias, value);
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}
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private bool isSelectAll;
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public bool IsSelectAll
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{
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get => isSelectAll;
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set => SetProperty(ref isSelectAll, value);
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}
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#endregion
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public ViewChannelViewModel(IEventAggregator eventAggregator, IDialogService dialogService) : base(eventAggregator)
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{
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this.dialogService = dialogService;
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#region 属性初始化
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// 初始化loading gif
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Loading = new GifImage(Properties.Resources.loading);
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Loading.StartAnimate();
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LoadingVisibility = Visibility.Collapsed;
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NoDataVisibility = Visibility.Collapsed;
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ArrowBack = NavigationIcon.Instance().ArrowBack;
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ArrowBack.Fill = DictionaryResource.GetColor("ColorTextDark");
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Medias = new ObservableCollection<ChannelMedia>();
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#endregion
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}
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#region 命令申明
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// 返回事件
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private DelegateCommand backSpaceCommand;
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public DelegateCommand BackSpaceCommand => backSpaceCommand ?? (backSpaceCommand = new DelegateCommand(ExecuteBackSpace));
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/// <summary>
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/// 返回事件
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/// </summary>
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private void ExecuteBackSpace()
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{
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ArrowBack.Fill = DictionaryResource.GetColor("ColorText");
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// 结束任务
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tokenSource?.Cancel();
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NavigationParam parameter = new NavigationParam
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{
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ViewName = ParentView,
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ParentViewName = null,
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Parameter = null
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};
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eventAggregator.GetEvent<NavigationEvent>().Publish(parameter);
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}
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// 全选按钮点击事件
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private DelegateCommand<object> selectAllCommand;
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public DelegateCommand<object> SelectAllCommand => selectAllCommand ?? (selectAllCommand = new DelegateCommand<object>(ExecuteSelectAllCommand));
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/// <summary>
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/// 全选按钮点击事件
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/// </summary>
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/// <param name="parameter"></param>
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private void ExecuteSelectAllCommand(object parameter)
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{
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if (IsSelectAll)
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{
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foreach (var item in Medias)
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{
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item.IsSelected = true;
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}
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}
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else
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{
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foreach (var item in Medias)
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{
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item.IsSelected = false;
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}
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}
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}
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// 列表选择事件
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private DelegateCommand<object> mediasCommand;
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public DelegateCommand<object> MediasCommand => mediasCommand ?? (mediasCommand = new DelegateCommand<object>(ExecuteMediasCommand));
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/// <summary>
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/// 列表选择事件
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/// </summary>
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/// <param name="parameter"></param>
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private void ExecuteMediasCommand(object parameter)
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{
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if (!(parameter is IList selectedMedia)) { return; }
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if (selectedMedia.Count == Medias.Count)
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{
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IsSelectAll = true;
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}
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else
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{
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IsSelectAll = false;
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}
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}
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// 添加选中项到下载列表事件
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private DelegateCommand addToDownloadCommand;
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public DelegateCommand AddToDownloadCommand => addToDownloadCommand ?? (addToDownloadCommand = new DelegateCommand(ExecuteAddToDownloadCommand));
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/// <summary>
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/// 添加选中项到下载列表事件
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/// </summary>
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private void ExecuteAddToDownloadCommand()
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{
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AddToDownload(true);
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}
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// 添加所有视频到下载列表事件
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private DelegateCommand addAllToDownloadCommand;
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public DelegateCommand AddAllToDownloadCommand => addAllToDownloadCommand ?? (addAllToDownloadCommand = new DelegateCommand(ExecuteAddAllToDownloadCommand));
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/// <summary>
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/// 添加所有视频到下载列表事件
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/// </summary>
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private void ExecuteAddAllToDownloadCommand()
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{
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AddToDownload(false);
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}
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#endregion
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/// <summary>
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/// 添加到下载
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/// </summary>
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/// <param name="isOnlySelected"></param>
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private async void AddToDownload(bool isOnlySelected)
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{
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// 频道里只有视频
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AddToDownloadService addToDownloadService = new AddToDownloadService(PlayStreamType.VIDEO);
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// 选择文件夹
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string directory = addToDownloadService.SetDirectory(dialogService);
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// 视频计数
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int i = 0;
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await Task.Run(() =>
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{
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// 为了避免执行其他操作时，
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// Medias变化导致的异常
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var list = Medias.ToList();
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// 添加到下载
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foreach (var media in list)
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{
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// 只下载选中项，跳过未选中项
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if (isOnlySelected && !media.IsSelected) { continue; }
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/// 有分P的就下载全部
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// 开启服务
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VideoInfoService videoInfoService = new VideoInfoService(media.Bvid);
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addToDownloadService.SetVideoInfoService(videoInfoService);
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addToDownloadService.GetVideo();
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addToDownloadService.ParseVideo(videoInfoService);
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// 下载
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i += addToDownloadService.AddToDownload(eventAggregator, directory);
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}
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});
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if (directory == null)
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{
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return;
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}
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// 通知用户添加到下载列表的结果
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if (i <= 0)
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{
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eventAggregator.GetEvent<MessageEvent>().Publish(DictionaryResource.GetString("TipAddDownloadingZero"));
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}
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else
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{
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eventAggregator.GetEvent<MessageEvent>().Publish($"{DictionaryResource.GetString("TipAddDownloadingFinished1")}{i}{DictionaryResource.GetString("TipAddDownloadingFinished2")}");
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}
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}
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private void OnCountChanged_Pager(int count) { }
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private bool OnCurrentChanged_Pager(int old, int current)
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{
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if (!IsEnabled)
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{
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//Pager.Current = old;
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return false;
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}
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Medias.Clear();
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IsSelectAll = false;
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LoadingVisibility = Visibility.Visible;
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NoDataVisibility = Visibility.Collapsed;
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UpdateChannel(current);
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return true;
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}
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private async void UpdateChannel(int current)
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{
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// 是否正在获取数据
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// 在所有的退出分支中都需要设为true
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IsEnabled = false;
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await Task.Run(() =>
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{
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CancellationToken cancellationToken = tokenSource.Token;
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var channels = Core.BiliApi.Users.UserSpace.GetChannelVideoList(mid, cid, current, VideoNumberInPage);
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if (channels == null || channels.Count == 0)
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{
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// 没有数据，UI提示
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LoadingVisibility = Visibility.Collapsed;
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NoDataVisibility = Visibility.Visible;
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return;
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}
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foreach (var video in channels)
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{
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if (video.Cid == 0)
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{
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continue;
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}
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// 查询、保存封面
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string coverUrl = video.Pic;
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BitmapImage cover;
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if (coverUrl == null || coverUrl == "")
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{
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cover = null; // new BitmapImage(new Uri($"pack://application:,,,/Resources/video-placeholder.png"));
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}
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else
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{
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if (!coverUrl.ToLower().StartsWith("http"))
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{
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coverUrl = $"https:{video.Pic}";
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}
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StorageCover storageCover = new StorageCover();
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cover = storageCover.GetCoverThumbnail(video.Aid, video.Bvid, -1, coverUrl, 200, 125);
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}
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// 播放数
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string play = string.Empty;
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if (video.Stat != null)
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{
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if (video.Stat.View > 0)
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{
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play = Format.FormatNumber(video.Stat.View);
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}
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else
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{
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play = "--";
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}
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}
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else
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{
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play = "--";
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}
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DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1)); // 当地时区
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DateTime dateCTime = startTime.AddSeconds(video.Ctime);
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string ctime = dateCTime.ToString("yyyy-MM-dd");
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App.PropertyChangeAsync(new Action(() =>
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{
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ChannelMedia media = new ChannelMedia(eventAggregator)
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{
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Avid = video.Aid,
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Bvid = video.Bvid,
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Cover = cover ?? new BitmapImage(new Uri($"pack://application:,,,/Resources/video-placeholder.png")),
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Duration = Format.FormatDuration3(video.Duration),
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Title = video.Title,
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PlayNumber = play,
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CreateTime = ctime
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};
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Medias.Add(media);
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LoadingVisibility = Visibility.Collapsed;
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NoDataVisibility = Visibility.Collapsed;
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}));
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// 判断是否该结束线程，若为true，跳出循环
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if (cancellationToken.IsCancellationRequested)
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{
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break;
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}
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}
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}, (tokenSource = new CancellationTokenSource()).Token);
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IsEnabled = true;
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}
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/// <summary>
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/// 导航到页面时执行
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/// </summary>
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/// <param name="navigationContext"></param>
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public override void OnNavigatedTo(NavigationContext navigationContext)
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{
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base.OnNavigatedTo(navigationContext);
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ArrowBack.Fill = DictionaryResource.GetColor("ColorTextDark");
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Medias.Clear();
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IsSelectAll = false;
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// 根据传入参数不同执行不同任务
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var parameter = navigationContext.Parameters.GetValue<Dictionary<string, object>>("Parameter");
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if (parameter == null)
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{
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return;
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}
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mid = (long)parameter["mid"];
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cid = (long)parameter["cid"];
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Title = (string)parameter["name"];
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int count = (int)parameter["count"];
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// 页面选择
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Pager = new CustomPagerViewModel(1, (int)Math.Ceiling((double)count / VideoNumberInPage));
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Pager.CurrentChanged += OnCurrentChanged_Pager;
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Pager.CountChanged += OnCountChanged_Pager;
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Pager.Current = 1;
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}
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}
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}
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