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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Providers;

namespace MediaBrowser.Providers.Plugins.Tmdb.TV
{
    /// <summary>
    /// TV episode image provider powered by TheMovieDb.
    /// </summary>
    public class TmdbEpisodeImageProvider : IRemoteImageProvider, IHasOrder
    {
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly TmdbClientManager _tmdbClientManager;

        /// <summary>
        /// Initializes a new instance of the <see cref="TmdbEpisodeImageProvider"/> class.
        /// </summary>
        /// <param name="httpClientFactory">The <see cref="IHttpClientFactory"/>.</param>
        /// <param name="tmdbClientManager">The <see cref="TmdbClientManager"/>.</param>
        public TmdbEpisodeImageProvider(IHttpClientFactory httpClientFactory, TmdbClientManager tmdbClientManager)
        {
            _httpClientFactory = httpClientFactory;
            _tmdbClientManager = tmdbClientManager;
        }

        /// <inheritdoc />
        public int Order => 1;

        /// <inheritdoc />
        public string Name => TmdbUtils.ProviderName;

        /// <inheritdoc />
        public bool Supports(BaseItem item)
        {
            return item is Controller.Entities.TV.Episode;
        }

        /// <inheritdoc />
        public IEnumerable<ImageType> GetSupportedImages(BaseItem item)
        {
            yield return ImageType.Primary;
        }

        /// <inheritdoc />
        public async Task<IEnumerable<RemoteImageInfo>> GetImages(BaseItem item, CancellationToken cancellationToken)
        {
            var episode = (Controller.Entities.TV.Episode)item;
            var series = episode.Series;

            var seriesTmdbId = Convert.ToInt32(series?.GetProviderId(MetadataProvider.Tmdb), CultureInfo.InvariantCulture);

            if (series is null || seriesTmdbId <= 0)
            {
                return Enumerable.Empty<RemoteImageInfo>();
            }

            var seasonNumber = episode.ParentIndexNumber ?? 1;
            var episodeNumber = episode.IndexNumber;

            if (!episodeNumber.HasValue)
            {
                return Enumerable.Empty<RemoteImageInfo>();
            }

            var language = item.GetPreferredMetadataLanguage();

            // TODO use image languages if All Languages isn't toggled, but there's currently no way to get that value in here
            var episodeResult = await _tmdbClientManager
                .GetEpisodeAsync(seriesTmdbId, seasonNumber, episodeNumber.Value, series.DisplayOrder, null, null, cancellationToken)
                .ConfigureAwait(false);

            var stills = episodeResult?.Images?.Stills;
            if (stills is null)
            {
                return Enumerable.Empty<RemoteImageInfo>();
            }

            return _tmdbClientManager.ConvertStillsToRemoteImageInfo(stills, language);
        }

        /// <inheritdoc />
        public Task<HttpResponseMessage> GetImageResponse(string url, CancellationToken cancellationToken)
        {
            return _httpClientFactory.CreateClient(NamedClient.Default).GetAsync(url, cancellationToken);
        }
    }
}