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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Model.Dto;
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using MediaBrowser.Model.Querying;
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using ServiceStack.ServiceHost;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading.Tasks;
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namespace MediaBrowser.Api.UserLibrary
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{
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/// <summary>
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/// Class BaseItemsByNameService
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/// </summary>
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/// <typeparam name="TItemType">The type of the T item type.</typeparam>
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public abstract class BaseItemsByNameService<TItemType> : BaseApiService
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where TItemType : BaseItem
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{
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/// <summary>
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/// The _user manager
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/// </summary>
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protected readonly IUserManager UserManager;
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/// <summary>
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/// The library manager
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/// </summary>
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protected readonly ILibraryManager LibraryManager;
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseItemsByNameService{TItemType}" /> class.
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/// </summary>
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/// <param name="userManager">The user manager.</param>
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/// <param name="libraryManager">The library manager.</param>
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protected BaseItemsByNameService(IUserManager userManager, ILibraryManager libraryManager)
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{
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UserManager = userManager;
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LibraryManager = libraryManager;
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}
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/// <summary>
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/// Gets the specified request.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <returns>Task{ItemsResult}.</returns>
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protected async Task<ItemsResult> GetResult(GetItemsByName request)
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{
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var user = UserManager.GetUserById(request.UserId);
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var item = string.IsNullOrEmpty(request.ParentId) ? user.RootFolder : DtoBuilder.GetItemByClientId(request.ParentId, UserManager, LibraryManager, user.Id);
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IEnumerable<BaseItem> items;
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if (item.IsFolder)
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{
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var folder = (Folder)item;
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items = request.Recursive ? folder.GetRecursiveChildren(user) : folder.GetChildren(user);
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}
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else
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{
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items = new[] { item };
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}
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items = FilterItems(request, items, user);
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items = ItemsService.ApplySortOrder(request, items, user, LibraryManager);
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var ibnItemsArray = GetAllItems(request, items, user).ToArray();
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IEnumerable<Tuple<string, Func<IEnumerable<BaseItem>>>> ibnItems = ibnItemsArray;
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var result = new ItemsResult
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{
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TotalRecordCount = ibnItemsArray.Length
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};
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if (request.StartIndex.HasValue || request.Limit.HasValue)
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{
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if (request.StartIndex.HasValue)
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{
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ibnItems = ibnItems.Skip(request.StartIndex.Value);
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}
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if (request.Limit.HasValue)
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{
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ibnItems = ibnItems.Take(request.Limit.Value);
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}
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}
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var fields = request.GetItemFields().ToList();
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var tasks = ibnItems.Select(i => GetDto(i, user, fields));
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var resultItems = await Task.WhenAll(tasks).ConfigureAwait(false);
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result.Items = resultItems.Where(i => i != null).ToArray();
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return result;
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}
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/// <summary>
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/// Filters the items.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <param name="items">The items.</param>
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/// <param name="user">The user.</param>
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/// <returns>IEnumerable{BaseItem}.</returns>
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private IEnumerable<BaseItem> FilterItems(GetItemsByName request, IEnumerable<BaseItem> items, User user)
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{
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items = items.AsParallel();
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items = ItemsService.ApplyAdditionalFilters(request, items);
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// Apply filters
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// Run them starting with the ones that are likely to reduce the list the most
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foreach (var filter in request.GetFilters().OrderByDescending(f => (int)f))
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{
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items = ItemsService.ApplyFilter(items, filter, user, UserManager);
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}
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items = items.AsEnumerable();
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return items;
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}
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/// <summary>
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/// Gets all items.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <param name="items">The items.</param>
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/// <param name="user">The user.</param>
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/// <returns>IEnumerable{Tuple{System.StringFunc{System.Int32}}}.</returns>
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protected abstract IEnumerable<Tuple<string, Func<IEnumerable<BaseItem>>>> GetAllItems(GetItemsByName request, IEnumerable<BaseItem> items, User user);
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/// <summary>
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/// Gets the entity.
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/// </summary>
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/// <param name="name">The name.</param>
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/// <returns>Task{BaseItem}.</returns>
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protected abstract Task<TItemType> GetEntity(string name);
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/// <summary>
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/// Gets the dto.
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/// </summary>
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/// <param name="stub">The stub.</param>
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/// <param name="user">The user.</param>
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/// <param name="fields">The fields.</param>
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/// <returns>Task{DtoBaseItem}.</returns>
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private async Task<BaseItemDto> GetDto(Tuple<string, Func<IEnumerable<BaseItem>>> stub, User user, List<ItemFields> fields)
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{
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BaseItem item;
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try
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{
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item = await GetEntity(stub.Item1).ConfigureAwait(false);
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}
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catch (IOException ex)
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{
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Logger.ErrorException("Error getting IBN item {0}", ex, stub.Item1);
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return null;
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}
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var dto = await new DtoBuilder(Logger, LibraryManager, UserManager).GetBaseItemDto(item, user, fields).ConfigureAwait(false);
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if (fields.Contains(ItemFields.ItemCounts))
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{
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var items = stub.Item2().ToList();
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dto.ChildCount = items.Count;
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dto.RecentlyAddedItemCount = items.Count(i => i.IsRecentlyAdded(user));
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}
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return dto;
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}
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}
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/// <summary>
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/// Class GetItemsByName
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/// </summary>
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public class GetItemsByName : BaseItemsRequest, IReturn<ItemsResult>
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{
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}
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}
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