using ErsatzTV.Controllers.Api.Requests;
using ErsatzTV.Core.Domain;
using ErsatzTV.Infrastructure.Data;
using NUnit.Framework;

namespace ErsatzTV.Tests.Support;

/// <summary>
///     One selection-type matrix, shared by every fixture that exercises a tagged-union selection
///     (rerun collections and playlist items). Both consumers of
///     <c>MediaCollections.Mapper.ProjectMediaItemToViewModel</c> are proved against the SAME data, so
///     widening the shared switch cannot be discharged for the second consumer by inspection alone —
///     which is the method that produced #671 in the first place.
/// </summary>
internal static class SelectionSeedData
{
    public const int SelectedId = 42;

    /// <summary>
    ///     Derived from production rather than hand-listed, so a newly-supported type joins the matrix
    ///     automatically and trips the <c>default:</c> arms below until someone teaches them about it.
    ///     Note this is the RERUN-COLLECTION predicate, used for playlist items as a deliberate
    ///     SUPERSET: <c>ReplacePlaylistItemsHandler.CollectionTypeMustBeValid</c> has no
    ///     <c>RemoteStream</c> case, so a RemoteStream playlist item cannot be created through the write
    ///     API today and the playlist fixture seeds that row directly. Covering it is forward-looking,
    ///     not a claim that the two sets are equivalent — split this if they ever legitimately diverge.
    /// </summary>
    public static IEnumerable<CollectionType> SupportedSelectionTypes =>
        Enum.GetValues<CollectionType>().Where(RerunCollectionRequestMapping.IsSupportedSelectionType);

    /// <summary>
    ///     The exact projected name per type. Pinning the whole string — rather than merely asserting
    ///     "not a placeholder" — is what makes a missing NESTED include leg visible: dropping
    ///     Episode → Season → Show still yields the placeholder-free "s??e04 - Selected episode", and
    ///     dropping MusicVideo → Artist still yields "Selected music video". Both would sail past a
    ///     looser assertion while having lost real data.
    /// </summary>
    public static string ExpectedName(CollectionType collectionType) =>
        collectionType switch
        {
            CollectionType.Collection => "Selected collection",
            CollectionType.MultiCollection => "Selected multi collection",
            CollectionType.SmartCollection => "Selected smart collection",
            CollectionType.TelevisionShow => "Selected show (2020)",
            CollectionType.TelevisionSeason => "Parent show (2020) - Season 3",
            CollectionType.Artist => "Selected artist",
            CollectionType.Movie => "Selected movie (2019)",
            CollectionType.Episode => "Episode's show - s02e04 - Selected episode",
            CollectionType.MusicVideo => "Video's artist - Selected music video",
            CollectionType.OtherVideo => "Selected other video",
            CollectionType.Song => "Song artist - Selected song",
            CollectionType.Image => "Selected image",
            CollectionType.RemoteStream => "Selected remote stream",
            _ => throw new AssertionException($"No expected name pinned for {collectionType}")
        };

    public static async Task SeedSelection(TvContext context, CollectionType collectionType)
    {
        switch (collectionType)
        {
            case CollectionType.Collection:
                context.Collections.Add(new Collection
                {
                    Id = SelectedId,
                    Name = "Selected collection",
                    MediaItems = []
                });
                break;
            case CollectionType.MultiCollection:
                context.MultiCollections.Add(new MultiCollection
                {
                    Id = SelectedId,
                    Name = "Selected multi collection"
                });
                break;
            case CollectionType.SmartCollection:
                context.SmartCollections.Add(new SmartCollection
                {
                    Id = SelectedId,
                    Name = "Selected smart collection",
                    Query = "tag:family"
                });
                break;
            case CollectionType.TelevisionShow:
                context.Shows.Add(new Show
                {
                    Id = SelectedId,
                    ShowMetadata = [new ShowMetadata { Title = "Selected show", Year = 2020 }]
                });
                break;
            case CollectionType.TelevisionSeason:
                context.Seasons.Add(new Season
                {
                    Id = SelectedId,
                    SeasonNumber = 3,
                    Show = new Show
                    {
                        Id = 900,
                        ShowMetadata = [new ShowMetadata { Title = "Parent show", Year = 2020 }]
                    }
                });
                break;
            case CollectionType.Artist:
                context.Artists.Add(new Artist
                {
                    Id = SelectedId,
                    ArtistMetadata = [new ArtistMetadata { Title = "Selected artist" }]
                });
                break;
            case CollectionType.Movie:
                context.Movies.Add(new Movie
                {
                    Id = SelectedId,
                    MovieMetadata = [new MovieMetadata { Title = "Selected movie", Year = 2019 }]
                });
                break;
            case CollectionType.Episode:
                context.Episodes.Add(new Episode
                {
                    Id = SelectedId,
                    EpisodeMetadata = [new EpisodeMetadata { Title = "Selected episode", EpisodeNumber = 4 }],
                    Season = new Season
                    {
                        Id = 901,
                        SeasonNumber = 2,
                        Show = new Show
                        {
                            Id = 902,
                            ShowMetadata = [new ShowMetadata { Title = "Episode's show", Year = 2018 }]
                        }
                    }
                });
                break;
            case CollectionType.MusicVideo:
                context.MusicVideos.Add(new MusicVideo
                {
                    Id = SelectedId,
                    MusicVideoMetadata = [new MusicVideoMetadata { Title = "Selected music video" }],
                    Artist = new Artist
                    {
                        Id = 903,
                        ArtistMetadata = [new ArtistMetadata { Title = "Video's artist" }]
                    }
                });
                break;
            case CollectionType.OtherVideo:
                context.OtherVideos.Add(new OtherVideo
                {
                    Id = SelectedId,
                    OtherVideoMetadata = [new OtherVideoMetadata { Title = "Selected other video" }]
                });
                break;
            case CollectionType.Song:
                context.Songs.Add(new Song
                {
                    Id = SelectedId,
                    SongMetadata =
                        [new SongMetadata { Title = "Selected song", Artists = ["Song artist"] }]
                });
                break;
            case CollectionType.Image:
                context.Images.Add(new Image
                {
                    Id = SelectedId,
                    ImageMetadata = [new ImageMetadata { Title = "Selected image" }]
                });
                break;
            case CollectionType.RemoteStream:
                context.RemoteStreams.Add(new RemoteStream
                {
                    Id = SelectedId,
                    Url = "http://example.invalid/stream",
                    RemoteStreamMetadata = [new RemoteStreamMetadata { Title = "Selected remote stream" }]
                });
                break;
            default:
                throw new AssertionException(
                    $"{collectionType} is a supported selection type but this suite does not know how " +
                    "to seed it — teach SeedSelection about it rather than narrowing the matrix.");
        }

        await context.SaveChangesAsync();
    }

    /// <summary>
    ///     Assigns the one foreign key the tagged union uses for this type. Shared so the rerun and
    ///     playlist fixtures cannot disagree about which slot a type occupies.
    /// </summary>
    public static void ApplySelection(
        CollectionType collectionType,
        Action<int> setCollectionId,
        Action<int> setMultiCollectionId,
        Action<int> setSmartCollectionId,
        Action<int> setMediaItemId)
    {
        switch (collectionType)
        {
            case CollectionType.Collection:
                setCollectionId(SelectedId);
                break;
            case CollectionType.MultiCollection:
                setMultiCollectionId(SelectedId);
                break;
            case CollectionType.SmartCollection:
                setSmartCollectionId(SelectedId);
                break;
            default:
                setMediaItemId(SelectedId);
                break;
        }
    }
}