using System.Collections.Generic;
using System.Linq;
using FluentValidation;
using Lidarr.Http;
using Lidarr.Http.REST.Attributes;
using Microsoft.AspNetCore.Mvc;
using NzbDrone.Common.Extensions;
using NzbDrone.Core.ArtistStats;
using NzbDrone.Core.Datastore.Events;
using NzbDrone.Core.DecisionEngine.Specifications;
using NzbDrone.Core.Download;
using NzbDrone.Core.MediaCover;
using NzbDrone.Core.MediaFiles;
using NzbDrone.Core.MediaFiles.Events;
using NzbDrone.Core.Messaging.Events;
using NzbDrone.Core.Music;
using NzbDrone.Core.Music.Events;
using NzbDrone.Core.Validation;
using NzbDrone.Core.Validation.Paths;
using NzbDrone.SignalR;

namespace Lidarr.Api.V1.Albums
{
    [V1ApiController]
    public class AlbumController : AlbumControllerWithSignalR,
        IHandle<AlbumGrabbedEvent>,
        IHandle<AlbumEditedEvent>,
        IHandle<AlbumUpdatedEvent>,
        IHandle<AlbumImportedEvent>,
        IHandle<TrackImportedEvent>,
        IHandle<TrackFileDeletedEvent>
    {
        protected readonly IArtistService _artistService;
        protected readonly IReleaseService _releaseService;
        protected readonly IAddAlbumService _addAlbumService;

        public AlbumController(IArtistService artistService,
                           IAlbumService albumService,
                           IAddAlbumService addAlbumService,
                           IReleaseService releaseService,
                           IArtistStatisticsService artistStatisticsService,
                           IMapCoversToLocal coverMapper,
                           IUpgradableSpecification upgradableSpecification,
                           IBroadcastSignalRMessage signalRBroadcaster,
                           QualityProfileExistsValidator qualityProfileExistsValidator,
                           MetadataProfileExistsValidator metadataProfileExistsValidator)

        : base(albumService, artistStatisticsService, coverMapper, upgradableSpecification, signalRBroadcaster)
        {
            _artistService = artistService;
            _releaseService = releaseService;
            _addAlbumService = addAlbumService;

            PostValidator.RuleFor(s => s.ForeignAlbumId).NotEmpty();
            PostValidator.RuleFor(s => s.Artist.QualityProfileId).SetValidator(qualityProfileExistsValidator);
            PostValidator.RuleFor(s => s.Artist.MetadataProfileId).SetValidator(metadataProfileExistsValidator);
            PostValidator.RuleFor(s => s.Artist.RootFolderPath).IsValidPath().When(s => s.Artist.Path.IsNullOrWhiteSpace());
            PostValidator.RuleFor(s => s.Artist.ForeignArtistId).NotEmpty();
        }

        [HttpGet]
        public List<AlbumResource> GetAlbums([FromQuery]int? artistId,
            [FromQuery] List<int> albumIds,
            [FromQuery]string foreignAlbumId,
            [FromQuery]bool includeAllArtistAlbums = false)
        {
            if (!artistId.HasValue && !albumIds.Any() && foreignAlbumId.IsNullOrWhiteSpace())
            {
                var albums = _albumService.GetAllAlbums();

                var artists = _artistService.GetAllArtists().ToDictionary(x => x.ArtistMetadataId);
                var releases = _releaseService.GetAllReleases().GroupBy(x => x.AlbumId).ToDictionary(x => x.Key, y => y.ToList());

                foreach (var album in albums)
                {
                    if (!artists.TryGetValue(album.ArtistMetadataId, out var albumArtist))
                    {
                        continue;
                    }

                    album.Artist = albumArtist;
                    album.AlbumReleases = releases.TryGetValue(album.Id, out var albumReleases) ? albumReleases : new List<AlbumRelease>();
                }

                return MapToResource(albums, false);
            }

            if (artistId.HasValue)
            {
                return MapToResource(_albumService.GetAlbumsByArtist(artistId.Value), false);
            }

            if (foreignAlbumId.IsNotNullOrWhiteSpace())
            {
                var album = _albumService.FindById(foreignAlbumId);

                if (album == null)
                {
                    return MapToResource(new List<Album>(), false);
                }

                if (includeAllArtistAlbums)
                {
                    return MapToResource(_albumService.GetAlbumsByArtist(album.ArtistId), false);
                }
                else
                {
                    return MapToResource(new List<Album> { album }, false);
                }
            }

            return MapToResource(_albumService.GetAlbums(albumIds), false);
        }

        [RestPostById]
        public ActionResult<AlbumResource> AddAlbum(AlbumResource albumResource)
        {
            var album = _addAlbumService.AddAlbum(albumResource.ToModel());

            return Created(album.Id);
        }

        [RestPutById]
        public ActionResult<AlbumResource> UpdateAlbum(AlbumResource albumResource)
        {
            var album = _albumService.GetAlbum(albumResource.Id);

            var model = albumResource.ToModel(album);

            _albumService.UpdateAlbum(model);
            _releaseService.UpdateMany(model.AlbumReleases.Value);

            BroadcastResourceChange(ModelAction.Updated, model.Id);

            return Accepted(model.Id);
        }

        [RestDeleteById]
        public void DeleteAlbum(int id, bool deleteFiles = false, bool addImportListExclusion = false)
        {
            _albumService.DeleteAlbum(id, deleteFiles, addImportListExclusion);
        }

        [HttpPut("monitor")]
        public IActionResult SetAlbumsMonitored([FromBody]AlbumsMonitoredResource resource)
        {
            _albumService.SetMonitored(resource.AlbumIds, resource.Monitored);

            return Accepted(MapToResource(_albumService.GetAlbums(resource.AlbumIds), false));
        }

        [NonAction]
        public void Handle(AlbumGrabbedEvent message)
        {
            foreach (var album in message.Album.Albums)
            {
                var resource = album.ToResource();
                resource.Grabbed = true;

                BroadcastResourceChange(ModelAction.Updated, resource);
            }
        }

        [NonAction]
        public void Handle(AlbumEditedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, MapToResource(message.Album, true));
        }

        [NonAction]
        public void Handle(AlbumUpdatedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, MapToResource(message.Album, true));
        }

        [NonAction]
        public void Handle(AlbumDeletedEvent message)
        {
            BroadcastResourceChange(ModelAction.Deleted, message.Album.ToResource());
        }

        [NonAction]
        public void Handle(AlbumImportedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, MapToResource(message.Album, true));
        }

        [NonAction]
        public void Handle(TrackImportedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.TrackInfo.Album.ToResource());
        }

        [NonAction]
        public void Handle(TrackFileDeletedEvent message)
        {
            if (message.Reason == DeleteMediaFileReason.Upgrade)
            {
                return;
            }

            BroadcastResourceChange(ModelAction.Updated, MapToResource(message.TrackFile.Album.Value, true));
        }
    }
}