494 lines
17 KiB
C#
494 lines
17 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using CommunityToolkit.Mvvm.Collections;
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using Serilog;
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using Wino.Core.Domain.Entities.Mail;
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using Wino.Core.Domain.Enums;
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using Wino.Core.Domain.Interfaces;
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using Wino.Core.Domain.Models.Comparers;
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using Wino.Core.Domain.Models.MailItem;
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using Wino.Mail.ViewModels.Data;
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namespace Wino.Mail.ViewModels.Collections;
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public class WinoMailCollection
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{
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// We cache each mail copy id for faster access on updates.
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// If the item provider here for update or removal doesn't exist here
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// we can ignore the operation.
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public HashSet<Guid> MailCopyIdHashSet = [];
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public event EventHandler<IMailItem> MailItemRemoved;
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private ListItemComparer listComparer = new ListItemComparer();
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private readonly ObservableGroupedCollection<object, IMailItem> _mailItemSource = new ObservableGroupedCollection<object, IMailItem>();
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public ReadOnlyObservableGroupedCollection<object, IMailItem> MailItems { get; }
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/// <summary>
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/// Property that defines how the item sorting should be done in the collection.
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/// </summary>
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public SortingOptionType SortingType { get; set; }
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/// <summary>
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/// Threading strategy that will help thread items according to the account type.
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/// </summary>
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public IThreadingStrategyProvider ThreadingStrategyProvider { get; set; }
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/// <summary>
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/// Automatically deletes single mail items after the delete operation or thread->single transition.
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/// This is useful when reply draft is discarded in the thread. Only enabled for Draft folder for now.
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/// </summary>
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public bool PruneSingleNonDraftItems { get; set; }
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public int Count => _mailItemSource.Count;
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public IDispatcher CoreDispatcher { get; set; }
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private readonly ThreadingManager _threadingManager;
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public WinoMailCollection(IThreadingStrategyProvider threadingStrategyProvider)
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{
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_threadingManager = new ThreadingManager(threadingStrategyProvider);
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MailItems = new ReadOnlyObservableGroupedCollection<object, IMailItem>(_mailItemSource);
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}
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public void Clear() => _mailItemSource.Clear();
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private object GetGroupingKey(IMailItem mailItem)
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{
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if (SortingType == SortingOptionType.ReceiveDate)
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return mailItem.CreationDate.ToLocalTime().Date;
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else
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return mailItem.FromName;
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}
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private void UpdateUniqueIdHashes(IMailHashContainer itemContainer, bool isAdd)
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{
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foreach (var item in itemContainer.GetContainingIds())
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{
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if (isAdd)
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{
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MailCopyIdHashSet.Add(item);
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}
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else
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{
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MailCopyIdHashSet.Remove(item);
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}
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}
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}
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private void InsertItemInternal(object groupKey, IMailItem mailItem)
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{
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UpdateUniqueIdHashes(mailItem, true);
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if (mailItem is MailCopy mailCopy)
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{
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_mailItemSource.InsertItem(groupKey, listComparer, new MailItemViewModel(mailCopy), listComparer.GetItemComparer());
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}
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else if (mailItem is ThreadMailItem threadMailItem)
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{
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_mailItemSource.InsertItem(groupKey, listComparer, new ThreadMailItemViewModel(threadMailItem), listComparer.GetItemComparer());
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}
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else
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{
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_mailItemSource.InsertItem(groupKey, listComparer, mailItem, listComparer.GetItemComparer());
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}
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}
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private void RemoveItemInternal(ObservableGroup<object, IMailItem> group, IMailItem mailItem)
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{
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UpdateUniqueIdHashes(mailItem, false);
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MailItemRemoved?.Invoke(this, mailItem);
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group.Remove(mailItem);
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if (group.Count == 0)
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{
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_mailItemSource.RemoveGroup(group.Key);
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}
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}
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private async Task HandleThreadingAsync(ObservableGroup<object, IMailItem> group, IMailItem item, MailCopy addedItem)
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{
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if (item is ThreadMailItemViewModel threadViewModel)
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{
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await HandleExistingThreadAsync(group, threadViewModel, addedItem);
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}
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else
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{
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await HandleNewThreadAsync(group, item, addedItem);
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}
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}
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private async Task HandleExistingThreadAsync(ObservableGroup<object, IMailItem> group, ThreadMailItemViewModel threadViewModel, MailCopy addedItem)
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{
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var existingGroupKey = GetGroupingKey(threadViewModel);
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await ExecuteUIThread(() => { threadViewModel.AddMailItemViewModel(addedItem); });
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var newGroupKey = GetGroupingKey(threadViewModel);
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if (!existingGroupKey.Equals(newGroupKey))
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{
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await MoveThreadToNewGroupAsync(group, threadViewModel, newGroupKey);
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}
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else
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{
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await ExecuteUIThread(() => { threadViewModel.NotifyPropertyChanges(); });
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}
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UpdateUniqueIdHashes(addedItem, true);
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}
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private async Task HandleNewThreadAsync(ObservableGroup<object, IMailItem> group, IMailItem item, MailCopy addedItem)
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{
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if (item.Id == addedItem.Id)
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{
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await UpdateExistingItemAsync(item, addedItem);
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}
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else
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{
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await CreateNewThreadAsync(group, item, addedItem);
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}
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}
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private async Task MoveThreadToNewGroupAsync(ObservableGroup<object, IMailItem> currentGroup, ThreadMailItemViewModel threadViewModel, object newGroupKey)
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{
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var mailThreadItems = threadViewModel.GetThreadMailItem();
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await ExecuteUIThread(() =>
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{
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RemoveItemInternal(currentGroup, threadViewModel);
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InsertItemInternal(newGroupKey, new ThreadMailItemViewModel(mailThreadItems));
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});
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}
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private async Task CreateNewThreadAsync(ObservableGroup<object, IMailItem> group, IMailItem item, MailCopy addedItem)
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{
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var threadMailItem = _threadingManager.CreateNewThread(item, addedItem);
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var newGroupKey = GetGroupingKey(threadMailItem);
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await ExecuteUIThread(() =>
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{
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RemoveItemInternal(group, item);
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InsertItemInternal(newGroupKey, threadMailItem);
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});
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}
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public async Task AddAsync(MailCopy addedItem)
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{
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foreach (var group in _mailItemSource)
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{
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foreach (var item in group)
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{
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if (_threadingManager.ShouldThread(addedItem, item))
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{
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await HandleThreadingAsync(group, item, addedItem);
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return;
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}
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else if (item.Id == addedItem.Id && item is MailItemViewModel itemViewModel)
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{
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await UpdateExistingItemAsync(itemViewModel, addedItem);
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return;
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}
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}
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}
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await AddNewItemAsync(addedItem);
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}
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private async Task AddNewItemAsync(MailCopy addedItem)
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{
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var groupKey = GetGroupingKey(addedItem);
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await ExecuteUIThread(() => { InsertItemInternal(groupKey, addedItem); });
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}
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private async Task UpdateExistingItemAsync(IMailItem existingItem, MailCopy updatedItem)
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{
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if (existingItem is MailItemViewModel itemViewModel)
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{
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UpdateUniqueIdHashes(itemViewModel, false);
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UpdateUniqueIdHashes(updatedItem, true);
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await ExecuteUIThread(() => { itemViewModel.MailCopy = updatedItem; });
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}
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}
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public void AddRange(IEnumerable<IMailItem> items, bool clearIdCache)
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{
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if (clearIdCache)
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{
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MailCopyIdHashSet.Clear();
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}
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var groupedByName = items
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.GroupBy(a => GetGroupingKey(a))
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.Select(a => new ObservableGroup<object, IMailItem>(a.Key, a));
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foreach (var group in groupedByName)
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{
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// Store all mail copy ids for faster access.
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foreach (var item in group)
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{
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if (item is MailItemViewModel mailCopyItem && !MailCopyIdHashSet.Contains(item.UniqueId))
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{
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MailCopyIdHashSet.Add(item.UniqueId);
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}
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else if (item is ThreadMailItemViewModel threadMailItem)
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{
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foreach (var mailItem in threadMailItem.ThreadItems)
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{
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if (!MailCopyIdHashSet.Contains(mailItem.UniqueId))
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{
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MailCopyIdHashSet.Add(mailItem.UniqueId);
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}
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}
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}
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}
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var existingGroup = _mailItemSource.FirstGroupByKeyOrDefault(group.Key);
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if (existingGroup == null)
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{
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_mailItemSource.AddGroup(group.Key, group);
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}
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else
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{
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foreach (var item in group)
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{
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existingGroup.Add(item);
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}
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}
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}
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}
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public MailItemContainer GetMailItemContainer(Guid uniqueMailId)
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{
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var groupCount = _mailItemSource.Count;
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for (int i = 0; i < groupCount; i++)
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{
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var group = _mailItemSource[i];
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for (int k = 0; k < group.Count; k++)
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{
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var item = group[k];
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if (item is MailItemViewModel singleMailItemViewModel && singleMailItemViewModel.UniqueId == uniqueMailId)
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return new MailItemContainer(singleMailItemViewModel);
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else if (item is ThreadMailItemViewModel threadMailItemViewModel && threadMailItemViewModel.HasUniqueId(uniqueMailId))
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{
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var singleItemViewModel = threadMailItemViewModel.GetItemById(uniqueMailId) as MailItemViewModel;
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return new MailItemContainer(singleItemViewModel, threadMailItemViewModel);
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}
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}
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}
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return null;
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}
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/// <summary>
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/// Fins the item container that updated mail copy belongs to and updates it.
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/// </summary>
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/// <param name="updatedMailCopy">Updated mail copy.</param>
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/// <returns></returns>
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public async Task UpdateMailCopy(MailCopy updatedMailCopy)
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{
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// This item doesn't exist in the list.
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if (!MailCopyIdHashSet.Contains(updatedMailCopy.UniqueId))
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{
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return;
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}
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await ExecuteUIThread(() =>
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{
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var itemContainer = GetMailItemContainer(updatedMailCopy.UniqueId);
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if (itemContainer == null) return;
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if (itemContainer.ItemViewModel != null)
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{
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UpdateUniqueIdHashes(itemContainer.ItemViewModel, false);
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}
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if (itemContainer.ItemViewModel != null)
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{
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itemContainer.ItemViewModel.MailCopy = updatedMailCopy;
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}
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UpdateUniqueIdHashes(updatedMailCopy, true);
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// Call thread notifications if possible.
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itemContainer.ThreadViewModel?.NotifyPropertyChanges();
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});
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}
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public MailItemViewModel GetNextItem(MailCopy mailCopy)
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{
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try
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{
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var groupCount = _mailItemSource.Count;
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for (int i = 0; i < groupCount; i++)
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{
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var group = _mailItemSource[i];
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for (int k = 0; k < group.Count; k++)
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{
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var item = group[k];
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if (item is MailItemViewModel singleMailItemViewModel && singleMailItemViewModel.UniqueId == mailCopy.UniqueId)
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{
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if (k + 1 < group.Count)
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{
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return group[k + 1] as MailItemViewModel;
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}
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else if (i + 1 < groupCount)
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{
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return _mailItemSource[i + 1][0] as MailItemViewModel;
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}
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else
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{
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return null;
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}
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}
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else if (item is ThreadMailItemViewModel threadMailItemViewModel && threadMailItemViewModel.HasUniqueId(mailCopy.UniqueId))
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{
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var singleItemViewModel = threadMailItemViewModel.GetItemById(mailCopy.UniqueId) as MailItemViewModel;
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if (singleItemViewModel == null) return null;
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var singleItemIndex = threadMailItemViewModel.ThreadItems.IndexOf(singleItemViewModel);
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if (singleItemIndex + 1 < threadMailItemViewModel.ThreadItems.Count)
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{
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return threadMailItemViewModel.ThreadItems[singleItemIndex + 1] as MailItemViewModel;
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}
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else if (i + 1 < groupCount)
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{
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return _mailItemSource[i + 1][0] as MailItemViewModel;
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}
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else
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{
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return null;
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}
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}
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}
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}
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return null;
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}
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catch (Exception ex)
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{
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Log.Warning(ex, "Failed to find the next item to select.");
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}
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return null;
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}
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public async Task RemoveAsync(MailCopy removeItem)
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{
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// This item doesn't exist in the list.
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if (!MailCopyIdHashSet.Contains(removeItem.UniqueId)) return;
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// Check all items for whether this item should be threaded with them.
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bool shouldExit = false;
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var groupCount = _mailItemSource.Count;
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for (int i = 0; i < groupCount; i++)
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{
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if (shouldExit) break;
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var group = _mailItemSource[i];
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for (int k = 0; k < group.Count; k++)
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{
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var item = group[k];
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if (item is ThreadMailItemViewModel threadMailItemViewModel && threadMailItemViewModel.HasUniqueId(removeItem.UniqueId))
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{
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var removalItem = threadMailItemViewModel.GetItemById(removeItem.UniqueId);
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if (removalItem == null) return;
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// Threads' Id is equal to the last item they hold.
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// We can't do Id check here because that'd remove the whole thread.
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/* Remove item from the thread.
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* If thread had 1 item inside:
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* -> Remove the thread and insert item as single item.
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* If thread had 0 item inside:
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* -> Remove the thread.
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*/
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var oldGroupKey = GetGroupingKey(threadMailItemViewModel);
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await ExecuteUIThread(() => { threadMailItemViewModel.RemoveCopyItem(removalItem); });
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if (threadMailItemViewModel.ThreadItems.Count == 1)
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{
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// Convert to single item.
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var singleViewModel = threadMailItemViewModel.GetSingleItemViewModel();
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var groupKey = GetGroupingKey(singleViewModel);
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await ExecuteUIThread(() =>
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{
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RemoveItemInternal(group, threadMailItemViewModel);
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InsertItemInternal(groupKey, singleViewModel);
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});
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// If thread->single conversion is being done, we should ignore it for non-draft items.
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// eg. Deleting a reply message from draft folder. Single non-draft item should not be re-added.
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if (PruneSingleNonDraftItems && !singleViewModel.IsDraft)
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{
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// This item should not be here anymore.
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// It's basically a reply mail in Draft folder.
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var newGroup = _mailItemSource.FirstGroupByKeyOrDefault(groupKey);
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if (newGroup != null)
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{
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await ExecuteUIThread(() => { RemoveItemInternal(newGroup, singleViewModel); });
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}
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}
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}
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else if (threadMailItemViewModel.ThreadItems.Count == 0)
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{
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await ExecuteUIThread(() => { RemoveItemInternal(group, threadMailItemViewModel); });
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}
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else
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{
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// Item inside the thread is removed.
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await ExecuteUIThread(() => { threadMailItemViewModel.ThreadItems.Remove(removalItem); });
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UpdateUniqueIdHashes(removalItem, false);
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}
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shouldExit = true;
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break;
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}
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else if (item.UniqueId == removeItem.UniqueId)
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{
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await ExecuteUIThread(() => { RemoveItemInternal(group, item); });
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shouldExit = true;
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break;
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}
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}
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}
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}
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private async Task ExecuteUIThread(Action action) => await CoreDispatcher?.ExecuteOnUIThread(action);
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}
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