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#pragma warning disable RS0030 // Do not use banned APIs
using System;
using System.Linq;
using System.Linq.Expressions;
using Jellyfin.Database.Implementations;
using Jellyfin.Database.Implementations.Entities;
namespace Jellyfin.Server.Implementations.Item;
/// <summary>
/// Extension methods for applying folder-aware filters that check items and their descendants.
/// </summary>
internal static class FolderAwareFilterExtensions
{
/// <summary>
/// Filters items where either the item matches the condition (for non-folders)
/// or any descendant matches (for folders). Uses reverse traversal through AncestorIds.
/// </summary>
/// <param name="query">The query to filter.</param>
/// <param name="context">The database context.</param>
/// <param name="condition">The condition to check on BaseItemEntity.</param>
/// <returns>Filtered query.</returns>
public static IQueryable<BaseItemEntity> WhereItemOrDescendantMatches(
this IQueryable<BaseItemEntity> query,
JellyfinDbContext context,
Expression<Func<BaseItemEntity, bool>> condition)
{
// Use correlated Any() subqueries instead of UNION + Contains for better index utilization
var matchingIds = context.BaseItems.Where(condition).Select(b => b.Id);
return query.Where(e =>
matchingIds.Contains(e.Id)
|| context.AncestorIds.Any(a => a.ParentItemId == e.Id && matchingIds.Contains(a.ItemId))
|| context.LinkedChildren.Any(lc => lc.ParentId == e.Id && matchingIds.Contains(lc.ChildId)));
}
/// <summary>
/// Filters items where neither the item matches the condition (for non-folders)
/// nor any descendant matches (for folders). Uses reverse traversal for infinite depth.
/// </summary>
/// <param name="query">The query to filter.</param>
/// <param name="context">The database context.</param>
/// <param name="condition">The condition that should NOT match.</param>
/// <returns>Filtered query.</returns>
public static IQueryable<BaseItemEntity> WhereNeitherItemNorDescendantMatches(
this IQueryable<BaseItemEntity> query,
JellyfinDbContext context,
Expression<Func<BaseItemEntity, bool>> condition)
{
var matchingIds = context.BaseItems.Where(condition).Select(b => b.Id);
return query.Where(e =>
!matchingIds.Contains(e.Id)
&& !context.AncestorIds.Any(a => a.ParentItemId == e.Id && matchingIds.Contains(a.ItemId))
&& !context.LinkedChildren.Any(lc => lc.ParentId == e.Id && matchingIds.Contains(lc.ChildId)));
}
}
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