using System.Globalization;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Channels;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Channels;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Providers;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace MediaBrowser.Providers.Movies
{
    class MovieDbImageProvider : IRemoteImageProvider, IHasOrder, IHasChangeMonitor
    {
        private readonly IJsonSerializer _jsonSerializer;
        private readonly IHttpClient _httpClient;

        public MovieDbImageProvider(IJsonSerializer jsonSerializer, IHttpClient httpClient)
        {
            _jsonSerializer = jsonSerializer;
            _httpClient = httpClient;
        }

        public string Name
        {
            get { return ProviderName; }
        }

        public static string ProviderName
        {
            get { return "TheMovieDb"; }
        }

        public bool Supports(IHasImages item)
        {
            var channelItem = item as IChannelMediaItem;

            if (channelItem != null)
            {
                if (channelItem.ContentType == ChannelMediaContentType.Movie)
                {
                    return true;
                }
                if (channelItem.ContentType == ChannelMediaContentType.MovieExtra)
                {
                    if (channelItem.ExtraType == ExtraType.Trailer)
                    {
                        return true;
                    }
                }
            }

            // Supports images for tv movies
            var tvProgram = item as LiveTvProgram;
            if (tvProgram != null && tvProgram.IsMovie)
            {
                return true;
            }

            return item is Movie || item is MusicVideo;
        }

        public IEnumerable<ImageType> GetSupportedImages(IHasImages item)
        {
            if (item is ChannelVideoItem || item is LiveTvProgram)
            {
                // Too many channel items to allow backdrops here
                return new List<ImageType>
                {
                    ImageType.Primary
                };
            }

            return new List<ImageType>
            {
                ImageType.Primary, 
                ImageType.Backdrop
            };
        }

        public async Task<IEnumerable<RemoteImageInfo>> GetImages(IHasImages item, CancellationToken cancellationToken)
        {
            var list = new List<RemoteImageInfo>();

            var results = await FetchImages((BaseItem)item, _jsonSerializer, cancellationToken).ConfigureAwait(false);

            if (results == null)
            {
                return list;
            }

            var tmdbSettings = await MovieDbProvider.Current.GetTmdbSettings(cancellationToken).ConfigureAwait(false);

            var tmdbImageUrl = tmdbSettings.images.base_url + "original";

            var supportedImages = GetSupportedImages(item).ToList();

            if (supportedImages.Contains(ImageType.Primary))
            {
                list.AddRange(GetPosters(results).Select(i => new RemoteImageInfo
                {
                    Url = tmdbImageUrl + i.file_path,
                    CommunityRating = i.vote_average,
                    VoteCount = i.vote_count,
                    Width = i.width,
                    Height = i.height,
                    Language = i.iso_639_1,
                    ProviderName = Name,
                    Type = ImageType.Primary,
                    RatingType = RatingType.Score
                }));
            }

            if (supportedImages.Contains(ImageType.Backdrop))
            {
                list.AddRange(GetBackdrops(results).Select(i => new RemoteImageInfo
                {
                    Url = tmdbImageUrl + i.file_path,
                    CommunityRating = i.vote_average,
                    VoteCount = i.vote_count,
                    Width = i.width,
                    Height = i.height,
                    ProviderName = Name,
                    Type = ImageType.Backdrop,
                    RatingType = RatingType.Score
                }));
            }

            var language = item.GetPreferredMetadataLanguage();

            var isLanguageEn = string.Equals(language, "en", StringComparison.OrdinalIgnoreCase);

            return list.OrderByDescending(i =>
            {
                if (string.Equals(language, i.Language, StringComparison.OrdinalIgnoreCase))
                {
                    return 3;
                }
                if (!isLanguageEn)
                {
                    if (string.Equals("en", i.Language, StringComparison.OrdinalIgnoreCase))
                    {
                        return 2;
                    }
                }
                if (string.IsNullOrEmpty(i.Language))
                {
                    return isLanguageEn ? 3 : 2;
                }
                return 0;
            })
                .ThenByDescending(i => i.CommunityRating ?? 0)
                .ThenByDescending(i => i.VoteCount ?? 0)
                .ToList();
        }

        /// <summary>
        /// Gets the posters.
        /// </summary>
        /// <param name="images">The images.</param>
        /// <returns>IEnumerable{MovieDbProvider.Poster}.</returns>
        private IEnumerable<MovieDbProvider.Poster> GetPosters(MovieDbProvider.Images images)
        {
            return images.posters ?? new List<MovieDbProvider.Poster>();
        }

        /// <summary>
        /// Gets the backdrops.
        /// </summary>
        /// <param name="images">The images.</param>
        /// <returns>IEnumerable{MovieDbProvider.Backdrop}.</returns>
        private IEnumerable<MovieDbProvider.Backdrop> GetBackdrops(MovieDbProvider.Images images)
        {
            var eligibleBackdrops = images.backdrops == null ? new List<MovieDbProvider.Backdrop>() :
                images.backdrops
                .ToList();

            return eligibleBackdrops.OrderByDescending(i => i.vote_average)
                .ThenByDescending(i => i.vote_count);
        }

        /// <summary>
        /// Fetches the images.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <param name="jsonSerializer">The json serializer.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task{MovieImages}.</returns>
        private async Task<MovieDbProvider.Images> FetchImages(BaseItem item, IJsonSerializer jsonSerializer,
            CancellationToken cancellationToken)
        {
            var tmdbId = item.GetProviderId(MetadataProviders.Tmdb);
            var language = item.GetPreferredMetadataLanguage();

            if (string.IsNullOrWhiteSpace(tmdbId))
            {
                var imdbId = item.GetProviderId(MetadataProviders.Imdb);
                if (!string.IsNullOrWhiteSpace(imdbId))
                {
                    var movieInfo = await MovieDbProvider.Current.FetchMainResult(imdbId, false, language, cancellationToken).ConfigureAwait(false);
                    if (movieInfo != null)
                    {
                        tmdbId = movieInfo.id.ToString(CultureInfo.InvariantCulture);
                    }
                }
            }

            if (string.IsNullOrWhiteSpace(tmdbId))
            {
                return null;
            }

            await MovieDbProvider.Current.EnsureMovieInfo(tmdbId, language, cancellationToken).ConfigureAwait(false);

            var path = MovieDbProvider.Current.GetDataFilePath(tmdbId, language);

            if (!string.IsNullOrEmpty(path))
            {
                var fileInfo = new FileInfo(path);

                if (fileInfo.Exists)
                {
                    return jsonSerializer.DeserializeFromFile<MovieDbProvider.CompleteMovieData>(path).images;
                }
            }

            return null;
        }

        public int Order
        {
            get { return 0; }
        }

        public Task<HttpResponseInfo> GetImageResponse(string url, CancellationToken cancellationToken)
        {
            return _httpClient.GetResponse(new HttpRequestOptions
            {
                CancellationToken = cancellationToken,
                Url = url,
                ResourcePool = MovieDbProvider.Current.MovieDbResourcePool
            });
        }

        public bool HasChanged(IHasMetadata item, IDirectoryService directoryService, DateTime date)
        {
            return MovieDbProvider.Current.HasChanged(item, date);
        }
    }
}
