using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Domain.Filler;
using ErsatzTV.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;
using static ErsatzTV.Application.Playouts.Mapper;

namespace ErsatzTV.Application.Playouts;

public class GetFuturePlayoutItemsByIdHandler : IRequestHandler<GetFuturePlayoutItemsById, PagedPlayoutItemsViewModel>
{
    private readonly IDbContextFactory<TvContext> _dbContextFactory;

    public GetFuturePlayoutItemsByIdHandler(IDbContextFactory<TvContext> dbContextFactory) =>
        _dbContextFactory = dbContextFactory;

    public async Task<PagedPlayoutItemsViewModel> Handle(
        GetFuturePlayoutItemsById request,
        CancellationToken cancellationToken)
    {
        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);

        DateTime now = DateTimeOffset.Now.UtcDateTime;

        int totalCount = await dbContext.PlayoutItems
            .CountAsync(
                i => i.Finish >= now && i.PlayoutId == request.PlayoutId &&
                     (request.ShowFiller || i.FillerKind == FillerKind.None),
                cancellationToken);

        List<PlayoutItemViewModel> page = await dbContext.PlayoutItems
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Movie).MovieMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Movie).MediaVersions)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as MusicVideo).MusicVideoMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as MusicVideo).MediaVersions)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as MusicVideo).Artist)
            .ThenInclude(mm => mm.ArtistMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Episode).EpisodeMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Episode).MediaVersions)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Episode).Season)
            .ThenInclude(s => s.SeasonMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Episode).Season.Show)
            .ThenInclude(s => s.ShowMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as OtherVideo).OtherVideoMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as OtherVideo).MediaVersions)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Song).SongMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Song).MediaVersions)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Image).ImageMetadata)
            .Include(i => i.MediaItem)
            .ThenInclude(mi => (mi as Image).MediaVersions)
            .Filter(i => i.PlayoutId == request.PlayoutId)
            .Filter(i => i.Finish >= now)
            .Filter(i => request.ShowFiller || i.FillerKind == FillerKind.None)
            .OrderBy(i => i.Start)
            .Skip(request.PageNum * request.PageSize)
            .Take(request.PageSize)
            .ToListAsync(cancellationToken)
            .Map(list => list.Map(ProjectToViewModel).ToList());

        return new PagedPlayoutItemsViewModel(totalCount, page);
    }
}