using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
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 ManualMovieDbImageProvider : IImageProvider
    {
        private readonly IJsonSerializer _jsonSerializer;
        private readonly IServerConfigurationManager _config;

        public ManualMovieDbImageProvider(IJsonSerializer jsonSerializer, IServerConfigurationManager config)
        {
            _jsonSerializer = jsonSerializer;
            _config = config;
        }

        public string Name
        {
            get { return "TheMovieDB"; }
        }

        public bool Supports(BaseItem item, ImageType imageType)
        {
            if (MovieDbImagesProvider.SupportsItem(item))
            {
                return imageType == ImageType.Primary || imageType == ImageType.Backdrop;
            }

            return false;
        }

        public async Task<IEnumerable<RemoteImageInfo>> GetAvailableImages(BaseItem item, ImageType imageType, CancellationToken cancellationToken)
        {
            var images = await GetAllImages(item, cancellationToken).ConfigureAwait(false);

            return images.Where(i => i.Type == imageType);
        }

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

            var results = FetchImages(item, _jsonSerializer);

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

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

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

            list.AddRange(GetPosters(results, item).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
            }));

            list.AddRange(GetBackdrops(results, item).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
            }));
            
            return list;
        }
        
        /// <summary>
        /// Gets the posters.
        /// </summary>
        /// <param name="images">The images.</param>
        /// <param name="item">The item.</param>
        /// <returns>IEnumerable{MovieDbProvider.Poster}.</returns>
        private IEnumerable<MovieDbProvider.Poster> GetPosters(MovieDbProvider.Images images, BaseItem item)
        {
            var language = _config.Configuration.PreferredMetadataLanguage;

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

            var eligiblePosters = images.posters == null ?
                new List<MovieDbProvider.Poster>() :
                images.posters.Where(i => i.width >= _config.Configuration.MinMoviePosterWidth)
                .ToList();

            return eligiblePosters.OrderByDescending(i =>
                {
                    if (string.Equals(language, i.iso_639_1, StringComparison.OrdinalIgnoreCase))
                    {
                        return 3;
                    }
                    if (!isLanguageEn)
                    {
                        if (string.Equals("en", i.iso_639_1, StringComparison.OrdinalIgnoreCase))
                        {
                            return 2;
                        }
                    }
                    if (string.IsNullOrEmpty(i.iso_639_1))
                    {
                        return isLanguageEn ? 3 : 2;
                    }
                    return 0;
                })
                .ThenByDescending(i => i.vote_average)
                .ToList();
        }

        /// <summary>
        /// Gets the backdrops.
        /// </summary>
        /// <param name="images">The images.</param>
        /// <param name="item">The item.</param>
        /// <returns>IEnumerable{MovieDbProvider.Backdrop}.</returns>
        private IEnumerable<MovieDbProvider.Backdrop> GetBackdrops(MovieDbProvider.Images images, BaseItem item)
        {
            var eligibleBackdrops = images.backdrops == null ? new List<MovieDbProvider.Backdrop>() :
                images.backdrops.Where(i => i.width >= _config.Configuration.MinMovieBackdropWidth)
                .ToList();

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

        /// <summary>
        /// Fetches the images.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <param name="jsonSerializer">The json serializer.</param>
        /// <returns>Task{MovieImages}.</returns>
        private MovieDbProvider.Images FetchImages(BaseItem item, IJsonSerializer jsonSerializer)
        {
            var path = MovieDbProvider.Current.GetDataFilePath(item, "default");

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

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

            return null;
        }
    }
}