using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using ErsatzTV.Core.Domain;
using ErsatzTV.Core.Extensions;
using ErsatzTV.Core.Health;
using ErsatzTV.Core.Health.Checks;
using ErsatzTV.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;

namespace ErsatzTV.Infrastructure.Health.Checks;

public class FileNotFoundHealthCheck : BaseHealthCheck, IFileNotFoundHealthCheck
{
    private readonly IDbContextFactory<TvContext> _dbContextFactory;

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

    protected override string Title => "File Not Found";

    public async Task<HealthCheckResult> Check()
    {
        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();

            List<Episode> episodes = await dbContext.Episodes
                .Filter(e => e.State == MediaItemState.FileNotFound)
                .Include(e => e.MediaVersions)
                .ThenInclude(mv => mv.MediaFiles)
                .ToListAsync();

            List<Movie> movies = await dbContext.Movies
                .Filter(m => m.State == MediaItemState.FileNotFound)
                .Include(m => m.MediaVersions)
                .ThenInclude(mv => mv.MediaFiles)
                .ToListAsync();
            
            List<MusicVideo> musicVideos = await dbContext.MusicVideos
                .Filter(mv => mv.State == MediaItemState.FileNotFound)
                .Include(mv => mv.MediaVersions)
                .ThenInclude(mv => mv.MediaFiles)
                .ToListAsync();
            
            List<OtherVideo> otherVideos = await dbContext.OtherVideos
                .Filter(ov => ov.State == MediaItemState.FileNotFound)
                .Include(ov => ov.MediaVersions)
                .ThenInclude(mv => mv.MediaFiles)
                .ToListAsync();

            List<Song> songs = await dbContext.Songs
                .Filter(s => s.State == MediaItemState.FileNotFound)
                .Include(s => s.MediaVersions)
                .ThenInclude(mv => mv.MediaFiles)
                .ToListAsync();
            
            var all = movies.Map(m => m.MediaVersions.Head().MediaFiles.Head().Path)
                .Append(episodes.Map(e => e.MediaVersions.Head().MediaFiles.Head().Path))
                .Append(musicVideos.Map(mv => mv.GetHeadVersion().MediaFiles.Head().Path))
                .Append(otherVideos.Map(ov => ov.GetHeadVersion().MediaFiles.Head().Path))
                .Append(songs.Map(s => s.GetHeadVersion().MediaFiles.Head().Path))
                .ToList();

            if (all.Any())
            {
                var paths = all.Take(5).ToList();

                var files = string.Join(", ", paths);

                return WarningResult(
                    $"There are {all.Count} files that do not exist on disk, including the following: {files}",
                    "/media/trash");
            }

            return OkResult();
    }
}