using PLib.Application.Abstractions;
using PLib.Application.Library;
using PLib.Domain.Videos;

namespace PLib.Tests.Library;

/// <summary>
/// A hand-written double rather than a mock: the scan logic is all about what ends up in the
/// repository, so the tests read better when they can just look at the resulting list.
/// </summary>
internal sealed class InMemoryVideoRepository : IVideoRepository
{
    private readonly Dictionary<string, VideoItem> _items = new(LibraryPathComparer.Instance);

    public int SaveCount { get; private set; }

    public IReadOnlyCollection<VideoItem> Items => _items.Values;

    public void Seed(params VideoItem[] items)
    {
        foreach (var item in items)
        {
            _items[item.FullPath] = item;
        }
    }

    public Task<IReadOnlyList<VideoItem>> GetAllAsync(CancellationToken cancellationToken = default) =>
        Task.FromResult<IReadOnlyList<VideoItem>>([.. _items.Values]);

    // Labels are held on the entity itself here, so this is the same list.
    public Task<IReadOnlyList<VideoItem>> GetAllWithLabelsAsync(CancellationToken cancellationToken = default) =>
        GetAllAsync(cancellationToken);

    // Applied sources live on the entity here, so this is the same list again.
    public Task<IReadOnlyList<VideoItem>> GetAllWithMetadataSourcesAsync(CancellationToken cancellationToken = default) =>
        GetAllAsync(cancellationToken);

    public Task<VideoItem?> FindByPathAsync(string fullPath, CancellationToken cancellationToken = default) =>
        Task.FromResult(_items.GetValueOrDefault(fullPath));

    // Labels are held on the entity itself here, so there is nothing extra to load.
    public Task<VideoItem?> FindWithLabelsAsync(Guid id, CancellationToken cancellationToken = default) =>
        Task.FromResult(_items.Values.FirstOrDefault(item => item.Id == id));

    public Task AddAsync(VideoItem item, CancellationToken cancellationToken = default)
    {
        _items[item.FullPath] = item;
        return Task.CompletedTask;
    }

    public Task RemoveAsync(VideoItem item, CancellationToken cancellationToken = default)
    {
        _items.Remove(item.FullPath);
        return Task.CompletedTask;
    }

    public Task SaveChangesAsync(CancellationToken cancellationToken = default)
    {
        SaveCount++;
        return Task.CompletedTask;
    }
}