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.Providers;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;

namespace MediaBrowser.Providers.TV
{
    public class ManualTvdbPersonImageProvider : IImageProvider
    {
        private readonly IServerConfigurationManager _config;
        private readonly ILibraryManager _library;

        public ManualTvdbPersonImageProvider(IServerConfigurationManager config, ILibraryManager library)
        {
            _config = config;
            _library = library;
        }

        public string Name
        {
            get { return ProviderName; }
        }

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

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

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

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

        public Task<IEnumerable<RemoteImageInfo>> GetAllImages(BaseItem item, CancellationToken cancellationToken)
        {
            var seriesWithPerson = _library.RootFolder
                .RecursiveChildren
                .OfType<Series>()
                .Where(i => !string.IsNullOrEmpty(i.GetProviderId(MetadataProviders.Tvdb)) && i.People.Any(p => string.Equals(p.Name, item.Name, StringComparison.OrdinalIgnoreCase)))
                .ToList();

            var infos = seriesWithPerson.Select(i => GetImageFromSeriesData(i, item.Name, cancellationToken))
                .Where(i => i != null)
                .Take(1);

            return Task.FromResult(infos);
        }

        private RemoteImageInfo GetImageFromSeriesData(Series series, string personName, CancellationToken cancellationToken)
        {
            var tvdbPath = TvdbSeriesProvider.GetSeriesDataPath(_config.ApplicationPaths, series.GetProviderId(MetadataProviders.Tvdb));

            var actorXmlPath = Path.Combine(tvdbPath, "actors.xml");

            try
            {
                return GetImageInfo(actorXmlPath, personName, cancellationToken);
            }
            catch (FileNotFoundException)
            {
                return null;
            }
        }

        private RemoteImageInfo GetImageInfo(string xmlFile, string personName, CancellationToken cancellationToken)
        {
            var settings = new XmlReaderSettings
            {
                CheckCharacters = false,
                IgnoreProcessingInstructions = true,
                IgnoreComments = true,
                ValidationType = ValidationType.None
            };

            using (var streamReader = new StreamReader(xmlFile, Encoding.UTF8))
            {
                // Use XmlReader for best performance
                using (var reader = XmlReader.Create(streamReader, settings))
                {
                    reader.MoveToContent();

                    // Loop through each element
                    while (reader.Read())
                    {
                        cancellationToken.ThrowIfCancellationRequested();

                        if (reader.NodeType == XmlNodeType.Element)
                        {
                            switch (reader.Name)
                            {
                                case "Actor":
                                    {
                                        using (var subtree = reader.ReadSubtree())
                                        {
                                            var info = FetchImageInfoFromActorNode(personName, subtree);

                                            if (info != null)
                                            {
                                                return info;
                                            }
                                        }
                                        break;
                                    }
                                default:
                                    reader.Skip();
                                    break;
                            }
                        }
                    }
                }
            }

            return null;
        }

        /// <summary>
        /// Fetches the data from actor node.
        /// </summary>
        /// <param name="personName">Name of the person.</param>
        /// <param name="reader">The reader.</param>
        /// <returns>System.String.</returns>
        private RemoteImageInfo FetchImageInfoFromActorNode(string personName, XmlReader reader)
        {
            reader.MoveToContent();

            string name = null;
            string image = null;

            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element)
                {
                    switch (reader.Name)
                    {
                        case "Name":
                            {
                                name = (reader.ReadElementContentAsString() ?? string.Empty).Trim();
                                break;
                            }

                        case "Image":
                            {
                                image = (reader.ReadElementContentAsString() ?? string.Empty).Trim();
                                break;
                            }

                        default:
                            reader.Skip();
                            break;
                    }
                }
            }

            if (!string.IsNullOrEmpty(name) && !string.IsNullOrEmpty(image) &&
                string.Equals(name, personName, StringComparison.OrdinalIgnoreCase))
            {
                return new RemoteImageInfo
                {
                    Url = TVUtils.BannerUrl + image,
                    Type = ImageType.Primary,
                    ProviderName = Name

                };
            }

            return null;
        }

        public int Priority
        {
            get { return 1; }
        }
    }
}