430 lines
14 KiB
C#
430 lines
14 KiB
C#
using DataLayer;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Threading.Tasks;
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using ReactiveUI;
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using Avalonia.Threading;
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using ApplicationServices;
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using AudibleUtilities;
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using LibationAvalonia.Dialogs.Login;
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using Avalonia.Collections;
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namespace LibationAvalonia.ViewModels
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{
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public class ProductsDisplayViewModel : ViewModelBase
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{
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/// <summary>Number of visible rows has changed</summary>
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public event EventHandler<int> VisibleCountChanged;
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public event EventHandler<int> RemovableCountChanged;
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/// <summary>Backing list of all grid entries</summary>
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private readonly AvaloniaList<GridEntry> SOURCE = new();
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/// <summary>Grid entries included in the filter set. If null, all grid entries are shown</summary>
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private List<GridEntry> FilteredInGridEntries;
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public string FilterString { get; private set; }
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public DataGridCollectionView GridEntries { get; private set; }
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private bool _removeColumnVisivle;
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public bool RemoveColumnVisivle { get => _removeColumnVisivle; private set => this.RaiseAndSetIfChanged(ref _removeColumnVisivle, value); }
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public List<LibraryBook> GetVisibleBookEntries()
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=> GridEntries
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.OfType<LibraryBookEntry>()
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.Select(lbe => lbe.LibraryBook)
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.ToList();
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private IEnumerable<LibraryBookEntry> GetAllBookEntries()
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=> SOURCE
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.BookEntries();
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public ProductsDisplayViewModel()
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{
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SearchEngineCommands.SearchEngineUpdated += SearchEngineCommands_SearchEngineUpdated;
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VisibleCountChanged?.Invoke(this, 0);
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}
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private static readonly System.Reflection.MethodInfo SetFlagsMethod;
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/// <summary>
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/// Tells the <see cref="DataGridCollectionView"/> whether it should process changes to the underlying collection
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/// </summary>
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/// <remarks> DataGridCollectionView.CollectionViewFlags.ShouldProcessCollectionChanged = 4</remarks>
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private void SetShouldProcessCollectionChanged(bool flagSet)
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=> SetFlagsMethod.Invoke(GridEntries, new object[] { 4, flagSet });
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static ProductsDisplayViewModel()
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{
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/*
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* When a book is removed from the library, SearchEngineUpdated is fired before LibrarySizeChanged, so
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* the book is removed from the filtered set and the grid is refreshed before RemoveBooks() is ever
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* called.
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*
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* To remove an item from DataGridCollectionView, it must be be in the current filtered view. If it's
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* not and you try to remove the book from the source list, the source will fire NotifyCollectionChanged
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* on an invalid item and the DataGridCollectionView will throw an exception. There are two ways to
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* remove an item that is filtered out of the DataGridCollectionView:
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*
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* (1) Re-add the item to the filtered-in list and refresh the grid so DataGridCollectionView knows
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* that the item is present. This causes the whole grid to flicker to refresh twice in rapid
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* succession, which is undesirable.
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*
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* (2) Remove it from the underlying collection and suppress NotifyCollectionChanged. This is the
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* method used. Steps to complete a removal using this method:
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*
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* (a) Set DataGridCollectionView.CollectionViewFlags.ShouldProcessCollectionChanged to false.
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* (b) Remove the item from the source list. The source will fire NotifyCollectionChanged, but the
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* DataGridCollectionView will ignore it.
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* (c) Reset the flag to true.
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*/
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SetFlagsMethod =
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typeof(DataGridCollectionView)
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.GetMethod("SetFlag", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
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}
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#region Display Functions
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internal void BindToGrid(List<LibraryBook> dbBooks)
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{
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GridEntries = new(SOURCE)
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{
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Filter = CollectionFilter
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};
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GridEntries.CollectionChanged += (_, _)
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=> VisibleCountChanged?.Invoke(this, GridEntries.OfType<LibraryBookEntry>().Count());
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var geList = dbBooks
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.Where(lb => lb.Book.IsProduct())
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.Select(b => new LibraryBookEntry(b))
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.Cast<GridEntry>()
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.ToList();
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var episodes = dbBooks.Where(lb => lb.Book.IsEpisodeChild());
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var seriesBooks = dbBooks.Where(lb => lb.Book.IsEpisodeParent()).ToList();
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foreach (var parent in seriesBooks)
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{
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var seriesEpisodes = episodes.FindChildren(parent);
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if (!seriesEpisodes.Any()) continue;
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var seriesEntry = new SeriesEntry(parent, seriesEpisodes);
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seriesEntry.Liberate.Expanded = false;
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geList.Add(seriesEntry);
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geList.AddRange(seriesEntry.Children);
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}
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//Create the filtered-in list before adding entries to avoid a refresh
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FilteredInGridEntries = QueryResults(geList, FilterString);
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SOURCE.AddRange(geList.OrderByDescending(e => e.DateAdded));
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}
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/// <summary>
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/// Call when there's been a change to the library
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/// </summary>
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internal async Task UpdateGridAsync(List<LibraryBook> dbBooks)
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{
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#region Add new or update existing grid entries
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//Add absent entries to grid, or update existing entry
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var allEntries = SOURCE.BookEntries();
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var seriesEntries = SOURCE.SeriesEntries().ToList();
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var parentedEpisodes = dbBooks.ParentedEpisodes();
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await Dispatcher.UIThread.InvokeAsync(() =>
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{
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foreach (var libraryBook in dbBooks.OrderBy(e => e.DateAdded))
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{
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var existingEntry = allEntries.FindByAsin(libraryBook.Book.AudibleProductId);
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if (libraryBook.Book.IsProduct())
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UpsertBook(libraryBook, existingEntry);
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else if (parentedEpisodes.Any(lb => lb == libraryBook))
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//Only try to add or update is this LibraryBook is a know child of a parent
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UpsertEpisode(libraryBook, existingEntry, seriesEntries, dbBooks);
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}
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});
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#endregion
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#region Remove entries no longer in the library
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//Rapid successive book removals will cause changes to SOURCE after the update has
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//begun but before it has completed, so perform all updates on a copy of the list.
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var sourceSnapshot = SOURCE.ToList();
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// remove deleted from grid.
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// note: actual deletion from db must still occur via the RemoveBook feature. deleting from audible will not trigger this
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var removedBooks =
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sourceSnapshot
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.BookEntries()
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.ExceptBy(dbBooks.Select(lb => lb.Book.AudibleProductId), ge => ge.AudibleProductId);
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//Remove books in series from their parents' Children list
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foreach (var removed in removedBooks.Where(b => b.Parent is not null))
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removed.Parent.RemoveChild(removed);
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//Remove series that have no children
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var removedSeries = sourceSnapshot.EmptySeries();
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await Dispatcher.UIThread.InvokeAsync(() => RemoveBooks(removedBooks, removedSeries));
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#endregion
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await Filter(FilterString);
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GC.Collect(GC.MaxGeneration, GCCollectionMode.Aggressive, true, true);
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}
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private void RemoveBooks(IEnumerable<LibraryBookEntry> removedBooks, IEnumerable<SeriesEntry> removedSeries)
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{
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foreach (var removed in removedBooks.Cast<GridEntry>().Concat(removedSeries).Where(b => b is not null).ToList())
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{
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if (GridEntries.PassesFilter(removed))
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GridEntries.Remove(removed);
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else
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{
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SetShouldProcessCollectionChanged(false);
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SOURCE.Remove(removed);
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SetShouldProcessCollectionChanged(true);
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}
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}
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}
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private void UpsertBook(LibraryBook book, LibraryBookEntry existingBookEntry)
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{
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if (existingBookEntry is null)
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// Add the new product to top
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SOURCE.Insert(0, new LibraryBookEntry(book));
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else
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// update existing
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existingBookEntry.UpdateLibraryBook(book);
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}
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private void UpsertEpisode(LibraryBook episodeBook, LibraryBookEntry existingEpisodeEntry, List<SeriesEntry> seriesEntries, IEnumerable<LibraryBook> dbBooks)
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{
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if (existingEpisodeEntry is null)
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{
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LibraryBookEntry episodeEntry;
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var seriesEntry = seriesEntries.FindSeriesParent(episodeBook);
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if (seriesEntry is null)
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{
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//Series doesn't exist yet, so create and add it
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var seriesBook = dbBooks.FindSeriesParent(episodeBook);
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if (seriesBook is null)
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{
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//This is only possible if the user's db has some malformed
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//entries from earlier Libation releases that could not be
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//automatically fixed. Log, but don't throw.
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Serilog.Log.Logger.Error("Episode={0}, Episode Series: {1}", episodeBook, episodeBook.Book.SeriesNames());
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return;
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}
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seriesEntry = new SeriesEntry(seriesBook, new[] { episodeBook });
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seriesEntries.Add(seriesEntry);
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episodeEntry = seriesEntry.Children[0];
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seriesEntry.Liberate.Expanded = true;
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SOURCE.Insert(0, seriesEntry);
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}
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else
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{
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//Series exists. Create and add episode child then update the SeriesEntry
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episodeEntry = new(episodeBook) { Parent = seriesEntry };
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seriesEntry.Children.Add(episodeEntry);
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var seriesBook = dbBooks.Single(lb => lb.Book.AudibleProductId == seriesEntry.LibraryBook.Book.AudibleProductId);
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seriesEntry.UpdateLibraryBook(seriesBook);
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}
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//Add episode to the grid beneath the parent
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int seriesIndex = SOURCE.IndexOf(seriesEntry);
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SOURCE.Insert(seriesIndex + 1, episodeEntry);
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}
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else
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existingEpisodeEntry.UpdateLibraryBook(episodeBook);
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}
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private async Task refreshGrid()
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{
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if (GridEntries.IsEditingItem)
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await Dispatcher.UIThread.InvokeAsync(GridEntries.CommitEdit);
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await Dispatcher.UIThread.InvokeAsync(GridEntries.Refresh);
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}
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public async Task ToggleSeriesExpanded(SeriesEntry seriesEntry)
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{
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seriesEntry.Liberate.Expanded = !seriesEntry.Liberate.Expanded;
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await refreshGrid();
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}
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#endregion
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#region Filtering
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public async Task Filter(string searchString)
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{
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FilterString = searchString;
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if (SOURCE.Count == 0)
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return;
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FilteredInGridEntries = QueryResults(SOURCE, searchString);
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await refreshGrid();
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}
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private bool CollectionFilter(object item)
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{
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if (item is LibraryBookEntry lbe
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&& lbe.IsEpisode
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&& lbe.Parent?.Liberate?.Expanded != true)
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return false;
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if (FilteredInGridEntries is null) return true;
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return FilteredInGridEntries.Contains(item);
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}
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private static List<GridEntry> QueryResults(IEnumerable<GridEntry> entries, string searchString)
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{
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if (string.IsNullOrEmpty(searchString)) return null;
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var searchResultSet = SearchEngineCommands.Search(searchString);
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var booksFilteredIn = entries.BookEntries().Join(searchResultSet.Docs, lbe => lbe.AudibleProductId, d => d.ProductId, (lbe, d) => (GridEntry)lbe);
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//Find all series containing children that match the search criteria
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var seriesFilteredIn = entries.SeriesEntries().Where(s => s.Children.Join(searchResultSet.Docs, lbe => lbe.AudibleProductId, d => d.ProductId, (lbe, d) => lbe).Any());
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return booksFilteredIn.Concat(seriesFilteredIn).ToList();
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}
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private async void SearchEngineCommands_SearchEngineUpdated(object sender, EventArgs e)
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{
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var filterResults = QueryResults(SOURCE, FilterString);
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if (filterResults is not null && FilteredInGridEntries.Intersect(filterResults).Count() != FilteredInGridEntries.Count)
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{
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FilteredInGridEntries = filterResults;
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await refreshGrid();
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}
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}
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#endregion
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#region Scan and Remove Books
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public void DoneRemovingBooks()
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{
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foreach (var item in SOURCE)
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item.PropertyChanged -= GridEntry_PropertyChanged;
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RemoveColumnVisivle = false;
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}
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public async Task RemoveCheckedBooksAsync()
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{
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var selectedBooks = GetAllBookEntries().Where(lbe => lbe.Remove == true).ToList();
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if (selectedBooks.Count == 0)
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return;
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var libraryBooks = selectedBooks.Select(rge => rge.LibraryBook).ToList();
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var result = await MessageBox.ShowConfirmationDialog(
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null,
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libraryBooks,
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// do not use `$` string interpolation. See impl.
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"Are you sure you want to remove {0} from Libation's library?",
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"Remove books from Libation?");
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if (result != DialogResult.Yes)
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return;
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foreach (var book in selectedBooks)
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book.PropertyChanged -= GridEntry_PropertyChanged;
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var idsToRemove = libraryBooks.Select(lb => lb.Book.AudibleProductId).ToList();
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void BindingList_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
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{
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if (e.Action != System.Collections.Specialized.NotifyCollectionChangedAction.Reset)
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return;
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//After DisplayBooks() re-creates the list,
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//re-subscribe to all items' PropertyChanged events.
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foreach (var b in GetAllBookEntries())
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b.PropertyChanged += GridEntry_PropertyChanged;
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GridEntries.CollectionChanged -= BindingList_CollectionChanged;
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}
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GridEntries.CollectionChanged += BindingList_CollectionChanged;
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//The RemoveBooksAsync will fire LibrarySizeChanged, which calls ProductsDisplay2.Display(),
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//so there's no need to remove books from the grid display here.
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var removeLibraryBooks = await LibraryCommands.RemoveBooksAsync(idsToRemove);
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RemovableCountChanged?.Invoke(this, 0);
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}
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public async Task ScanAndRemoveBooksAsync(params Account[] accounts)
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{
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foreach (var item in SOURCE)
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{
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item.Remove = false;
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item.PropertyChanged += GridEntry_PropertyChanged;
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}
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RemoveColumnVisivle = true;
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RemovableCountChanged?.Invoke(this, 0);
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try
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{
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if (accounts is null || accounts.Length == 0)
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return;
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var allBooks = GetAllBookEntries();
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var lib = allBooks
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.Select(lbe => lbe.LibraryBook)
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.Where(lb => !lb.Book.HasLiberated());
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var removedBooks = await LibraryCommands.FindInactiveBooks(AvaloniaLoginChoiceEager.ApiExtendedFunc, lib, accounts);
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var removable = allBooks.Where(lbe => removedBooks.Any(rb => rb.Book.AudibleProductId == lbe.AudibleProductId)).ToList();
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foreach (var r in removable)
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r.Remove = true;
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}
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catch (Exception ex)
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{
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await MessageBox.ShowAdminAlert(
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null,
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"Error scanning library. You may still manually select books to remove from Libation's library.",
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"Error scanning library",
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ex);
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}
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}
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private void GridEntry_PropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == nameof(GridEntry.Remove) && sender is LibraryBookEntry lbEntry)
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{
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int removeCount = GetAllBookEntries().Count(lbe => lbe.Remove is true);
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RemovableCountChanged?.Invoke(this, removeCount);
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}
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}
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#endregion
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}
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}
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