using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Emby.Server.Implementations.Data;
using Jellyfin.Database.Implementations;
using Jellyfin.Database.Implementations.DbConfiguration;
using Jellyfin.Database.Implementations.Entities;
using Jellyfin.Database.Implementations.Locking;
using Jellyfin.Database.Providers.PostgreSQL;
using Jellyfin.Server.Implementations.Item;
using Jellyfin.Server.Tests.Migrations;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Model.Configuration;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using Npgsql;
using Xunit;
using BaseItemKind = Jellyfin.Data.Enums.BaseItemKind;
using User = Jellyfin.Database.Implementations.Entities.User;

namespace Jellyfin.Server.Tests.Item;

/// <summary>
/// Runs the presentation-key collapse that library browse, search and the by-name endpoints all go
/// through against a real PostgreSQL. SQLite accepts <c>MIN</c> over any column type, PostgreSQL has no
/// <c>min(uuid)</c> aggregate, so a representative picked with an aggregate over the id only ever fails
/// here - with <c>42883 function min(uuid) does not exist</c>.
/// </summary>
[Trait("Category", "RequiresDocker")]
public sealed class PostgreSqlPresentationKeyGroupingTests : IAsyncLifetime
{
    // The alternate sorts before the primary, and the second duplicate genre before the first, so a
    // representative that ignores the primary-version preference or the id order picks the wrong row.
    private static readonly Guid _primaryMovieId = Guid.Parse("eeeeeeee-0000-0000-0000-000000000001");
    private static readonly Guid _alternateMovieId = Guid.Parse("11111111-0000-0000-0000-000000000002");
    private static readonly Guid _secondAlternateMovieId = Guid.Parse("22222222-0000-0000-0000-000000000003");
    private static readonly Guid _firstOrphanId = Guid.Parse("33333333-0000-0000-0000-000000000004");
    private static readonly Guid _secondOrphanId = Guid.Parse("dddddddd-0000-0000-0000-000000000005");
    private static readonly Guid _orphanPrimaryId = Guid.Parse("cccccccc-0000-0000-0000-000000000006");
    private static readonly Guid _standaloneMovieId = Guid.Parse("44444444-0000-0000-0000-000000000007");

    private static readonly Guid _firstGenreId = Guid.Parse("bbbbbbbb-0000-0000-0000-000000000001");
    private static readonly Guid _secondGenreId = Guid.Parse("aaaaaaaa-0000-0000-0000-000000000002");
    private static readonly Guid _genreMovieId = Guid.Parse("66666666-0000-0000-0000-000000000003");
    private static readonly Guid _genreValueId = Guid.Parse("77777777-0000-0000-0000-000000000004");

    private readonly ItemTypeLookup _itemTypeLookup = new();

    private PostgreSqlTestServer _server = null!;
    private NpgsqlDataSource _dataSource = null!;
    private BaseItemRepository _repository = null!;

    public async ValueTask InitializeAsync()
    {
        _server = await PostgreSqlTestServer.StartAsync().ConfigureAwait(false);
        var connectionString = await _server.CreateDatabaseAsync("presentation_key_grouping", TestContext.Current.CancellationToken).ConfigureAwait(false);
        _dataSource = new NpgsqlDataSourceBuilder(connectionString).Build();

        var context = CreateDbContext();
        await using (context.ConfigureAwait(false))
        {
            await context.Database.EnsureCreatedAsync(TestContext.Current.CancellationToken).ConfigureAwait(false);
        }

        var serverConfigurationManager = new Mock<IServerConfigurationManager>();
        serverConfigurationManager.Setup(c => c.Configuration).Returns(new ServerConfiguration());

        var factory = new Mock<IDbContextFactory<JellyfinDbContext>>();
        factory.Setup(f => f.CreateDbContext()).Returns(CreateDbContext);
        factory.Setup(f => f.CreateDbContextAsync(It.IsAny<CancellationToken>())).ReturnsAsync(CreateDbContext);

        _repository = new BaseItemRepository(
            factory.Object,
            new Mock<IServerApplicationHost>().Object,
            _itemTypeLookup,
            serverConfigurationManager.Object,
            NullLogger<BaseItemRepository>.Instance);

        await SeedAsync().ConfigureAwait(false);
    }

    public async ValueTask DisposeAsync()
    {
        await _dataSource.DisposeAsync().ConfigureAwait(false);
        await _server.DisposeAsync().ConfigureAwait(false);
    }

    /// <summary>
    /// The collapse behind library browse and search: one row per presentation key, the primary version
    /// when the group has one, the lowest id otherwise.
    /// </summary>
    [Fact]
    public void GetItemList_CollapsesPresentationKeyGroups()
    {
        var items = _repository.GetItemList(new InternalItemsQuery(new User("grouping", "auth", "reset"))
        {
            IncludeItemTypes = [BaseItemKind.Movie],
            IncludeOwnedItems = true
        });

        Assert.Equal(
            new[] { _primaryMovieId, _firstOrphanId, _standaloneMovieId, _genreMovieId }.OrderBy(id => id).ToArray(),
            items.Select(i => i.Id).OrderBy(id => id).ToArray());
    }

    /// <summary>
    /// The same collapse on the by-name path, which picks the lowest id per group without a
    /// primary-version preference.
    /// </summary>
    [Fact]
    public void GetGenres_CollapsesPresentationKeyGroups()
    {
        var result = _repository.GetGenres(new InternalItemsQuery(new User("genres", "auth", "reset")));

        var item = Assert.Single(result.Items);
        Assert.Equal(_secondGenreId, item.Item.Id);
        Assert.Equal(1, result.TotalRecordCount);
    }

    private JellyfinDbContext CreateDbContext()
    {
        var optionsBuilder = new DbContextOptionsBuilder<JellyfinDbContext>();
        var provider = new PostgreSqlDatabaseProvider(_dataSource);
        provider.Initialise(optionsBuilder, new DatabaseConfigurationOptions { DatabaseType = "PostgreSQL" });
        return new JellyfinDbContext(
            optionsBuilder.Options,
            NullLogger<JellyfinDbContext>.Instance,
            provider,
            new NoLockBehavior(NullLogger<NoLockBehavior>.Instance));
    }

    private async Task SeedAsync()
    {
        var context = CreateDbContext();
        await using (context.ConfigureAwait(false))
        {
            // One version group: a primary plus two alternates, both sorting before it by id.
            var versionKey = _primaryMovieId.ToString("N");
            context.BaseItems.Add(CreateMovie(_primaryMovieId, "Movie", versionKey, null));
            context.BaseItems.Add(CreateMovie(_alternateMovieId, "Movie - 1080p", versionKey, _primaryMovieId));
            context.BaseItems.Add(CreateMovie(_secondAlternateMovieId, "Movie - 4K", versionKey, _primaryMovieId));

            // One group whose primary is not in the result set, so the lowest id represents it.
            var orphanKey = _orphanPrimaryId.ToString("N");
            context.BaseItems.Add(CreateMovie(_firstOrphanId, "Orphan - 1080p", orphanKey, _orphanPrimaryId));
            context.BaseItems.Add(CreateMovie(_secondOrphanId, "Orphan - 4K", orphanKey, _orphanPrimaryId));

            context.BaseItems.Add(CreateMovie(_standaloneMovieId, "Standalone", _standaloneMovieId.ToString("N"), null));

            // Two genre entities sharing a presentation key, credited on one movie so the by-name
            // item-value join sees them.
            var genreKey = _firstGenreId.ToString("N");
            context.BaseItems.Add(CreateGenre(_firstGenreId, "Action", genreKey));
            context.BaseItems.Add(CreateGenre(_secondGenreId, "Action", genreKey));

            var genreMovie = CreateMovie(_genreMovieId, "Genre Movie", _genreMovieId.ToString("N"), null);
            genreMovie.CleanName = "genre movie";
            context.BaseItems.Add(genreMovie);

            var genreValue = new ItemValue
            {
                ItemValueId = _genreValueId,
                Type = ItemValueType.Genre,
                Value = "Action",
                CleanValue = "action"
            };
            context.ItemValues.Add(genreValue);
            context.ItemValuesMap.Add(new ItemValueMap
            {
                ItemId = _genreMovieId,
                ItemValueId = _genreValueId,
                Item = genreMovie,
                ItemValue = genreValue
            });

            await context.SaveChangesAsync(TestContext.Current.CancellationToken).ConfigureAwait(false);
        }
    }

    private BaseItemEntity CreateMovie(Guid id, string name, string presentationKey, Guid? primaryVersionId)
    {
        return new BaseItemEntity
        {
            Id = id,
            Type = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Movie],
            Name = name,
            PresentationUniqueKey = presentationKey,
            PrimaryVersionId = primaryVersionId,
            MediaType = "Video",
            IsMovie = true,
            IsFolder = false,
            IsVirtualItem = false
        };
    }

    private BaseItemEntity CreateGenre(Guid id, string name, string presentationKey)
    {
        return new BaseItemEntity
        {
            Id = id,
            Type = _itemTypeLookup.BaseItemKindNames[BaseItemKind.Genre],
            Name = name,
            CleanName = "action",
            PresentationUniqueKey = presentationKey,
            IsFolder = false,
            IsVirtualItem = false
        };
    }
}