using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Providers;

namespace MediaBrowser.Providers.TV
{
    public class TvdbEpisodeImageProvider : IRemoteImageProvider
    {
        private readonly IServerConfigurationManager _config;
        private readonly CultureInfo _usCulture = new CultureInfo("en-US");
        private readonly IHttpClient _httpClient;
        private readonly IFileSystem _fileSystem;

        public TvdbEpisodeImageProvider(IServerConfigurationManager config, IHttpClient httpClient, IFileSystem fileSystem)
        {
            _config = config;
            _httpClient = httpClient;
            _fileSystem = fileSystem;
        }

        public string Name => "TheTVDB";

        public bool Supports(BaseItem item)
        {
            return item is Episode;
        }

        public IEnumerable<ImageType> GetSupportedImages(BaseItem item)
        {
            return new List<ImageType>
            {
                ImageType.Primary
            };
        }

        public Task<IEnumerable<RemoteImageInfo>> GetImages(BaseItem item, CancellationToken cancellationToken)
        {
            var episode = (Episode)item;
            var series = episode.Series;

            if (series != null && TvdbSeriesProvider.IsValidSeries(series.ProviderIds))
            {
                // Process images
                var seriesDataPath = TvdbSeriesProvider.GetSeriesDataPath(_config.ApplicationPaths, series.ProviderIds);

                var nodes = TvdbEpisodeProvider.Current.GetEpisodeXmlNodes(seriesDataPath, episode.GetLookupInfo());

                var result = nodes.Select(i => GetImageInfo(i, cancellationToken))
                    .Where(i => i != null)
                    .ToList();

                return Task.FromResult<IEnumerable<RemoteImageInfo>>(result);
            }

            return Task.FromResult<IEnumerable<RemoteImageInfo>>(new RemoteImageInfo[] { });
        }

        private RemoteImageInfo GetImageInfo(XmlReader reader, CancellationToken cancellationToken)
        {
            var height = 225;
            var width = 400;
            var url = string.Empty;

            // Use XmlReader for best performance
            using (reader)
            {
                reader.MoveToContent();
                reader.Read();

                // Loop through each element
                while (!reader.EOF && reader.ReadState == ReadState.Interactive)
                {
                    if (reader.NodeType == XmlNodeType.Element)
                    {
                        cancellationToken.ThrowIfCancellationRequested();

                        switch (reader.Name)
                        {
                            case "thumb_width":
                                {
                                    var val = reader.ReadElementContentAsString();

                                    if (!string.IsNullOrWhiteSpace(val))
                                    {
                                        int rval;

                                        // int.TryParse is local aware, so it can be probamatic, force us culture
                                        if (int.TryParse(val, NumberStyles.Integer, _usCulture, out rval))
                                        {
                                            width = rval;
                                        }
                                    }
                                    break;
                                }

                            case "thumb_height":
                                {
                                    var val = reader.ReadElementContentAsString();

                                    if (!string.IsNullOrWhiteSpace(val))
                                    {
                                        int rval;

                                        // int.TryParse is local aware, so it can be probamatic, force us culture
                                        if (int.TryParse(val, NumberStyles.Integer, _usCulture, out rval))
                                        {
                                            height = rval;
                                        }
                                    }
                                    break;
                                }

                            case "filename":
                                {
                                    var val = reader.ReadElementContentAsString();
                                    if (!string.IsNullOrWhiteSpace(val))
                                    {
                                        url = TVUtils.BannerUrl + val;
                                    }
                                    break;
                                }
                            default:
                                {
                                    reader.Skip();
                                    break;
                                }
                        }
                    }
                    else
                    {
                        reader.Read();
                    }
                }
            }

            if (string.IsNullOrEmpty(url))
            {
                return null;
            }

            return new RemoteImageInfo
            {
                Width = width,
                Height = height,
                ProviderName = Name,
                Url = url,
                Type = ImageType.Primary
            };
        }

        public int Order => 0;

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