using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Localization;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Providers;
using MediaBrowser.Model.Serialization;
using MediaBrowser.Providers.Movies;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace MediaBrowser.Providers.TV
{
    public class MovieDbSeriesProvider : IRemoteMetadataProvider<Series, SeriesInfo>, IHasOrder
    {
        private const string GetTvInfo3 = @"http://api.themoviedb.org/3/tv/{0}?api_key={1}&append_to_response=casts,images,keywords,external_ids";
        private readonly CultureInfo _usCulture = new CultureInfo("en-US");

        internal static MovieDbSeriesProvider Current { get; private set; }

        private readonly IJsonSerializer _jsonSerializer;
        private readonly IFileSystem _fileSystem;
        private readonly IServerConfigurationManager _configurationManager;
        private readonly ILogger _logger;
        private readonly ILocalizationManager _localization;
        private readonly IHttpClient _httpClient;

        public MovieDbSeriesProvider(IJsonSerializer jsonSerializer, IFileSystem fileSystem, IServerConfigurationManager configurationManager, ILogger logger, ILocalizationManager localization, IHttpClient httpClient)
        {
            _jsonSerializer = jsonSerializer;
            _fileSystem = fileSystem;
            _configurationManager = configurationManager;
            _logger = logger;
            _localization = localization;
            _httpClient = httpClient;
            Current = this;
        }

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

        public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(SeriesInfo searchInfo, CancellationToken cancellationToken)
        {
            var tmdbId = searchInfo.GetProviderId(MetadataProviders.Tmdb);

            if (!string.IsNullOrEmpty(tmdbId))
            {
                cancellationToken.ThrowIfCancellationRequested();

                await EnsureSeriesInfo(tmdbId, searchInfo.MetadataLanguage, cancellationToken).ConfigureAwait(false);
                
                var dataFilePath = GetDataFilePath(tmdbId, searchInfo.MetadataLanguage);

                var obj = _jsonSerializer.DeserializeFromFile<RootObject>(dataFilePath);

                var tmdbSettings = await MovieDbProvider.Current.GetTmdbSettings(cancellationToken).ConfigureAwait(false);
                var tmdbImageUrl = tmdbSettings.images.base_url + "original";

                var remoteResult = new RemoteSearchResult
                {
                    Name = obj.name,
                    SearchProviderName = Name,
                    ImageUrl = string.IsNullOrWhiteSpace(obj.poster_path) ? null : tmdbImageUrl + obj.poster_path
                };

                remoteResult.SetProviderId(MetadataProviders.Tmdb, obj.id.ToString(_usCulture));
                remoteResult.SetProviderId(MetadataProviders.Imdb, obj.external_ids.imdb_id);

                if (obj.external_ids.tvdb_id > 0)
                {
                    remoteResult.SetProviderId(MetadataProviders.Tvdb, obj.external_ids.tvdb_id.ToString(_usCulture));
                }
                
                return new[] { remoteResult };
            }

            var imdbId = searchInfo.GetProviderId(MetadataProviders.Imdb);

            if (!string.IsNullOrEmpty(imdbId))
            {
                var searchResult = await FindByExternalId(imdbId, "imdb_id", cancellationToken).ConfigureAwait(false);

                if (searchResult != null)
                {
                    return new[] { searchResult };
                }
            }

            var tvdbId = searchInfo.GetProviderId(MetadataProviders.Tvdb);

            if (!string.IsNullOrEmpty(tvdbId))
            {
                var searchResult = await FindByExternalId(tvdbId, "tvdb_id", cancellationToken).ConfigureAwait(false);

                if (searchResult != null)
                {
                    return new[] { searchResult };
                }
            }

            return await new MovieDbSearch(_logger, _jsonSerializer).GetSearchResults(searchInfo, cancellationToken).ConfigureAwait(false);
        }

        public async Task<MetadataResult<Series>> GetMetadata(SeriesInfo info, CancellationToken cancellationToken)
        {
            var result = new MetadataResult<Series>();

            var tmdbId = info.GetProviderId(MetadataProviders.Tmdb);

            if (string.IsNullOrEmpty(tmdbId))
            {
                var imdbId = info.GetProviderId(MetadataProviders.Imdb);

                if (!string.IsNullOrEmpty(imdbId))
                {
                    var searchResult = await FindByExternalId(imdbId, "imdb_id", cancellationToken).ConfigureAwait(false);

                    if (searchResult != null)
                    {
                        tmdbId = searchResult.GetProviderId(MetadataProviders.Tmdb);
                    }
                }
            }

            if (string.IsNullOrEmpty(tmdbId))
            {
                var tvdbId = info.GetProviderId(MetadataProviders.Tvdb);

                if (!string.IsNullOrEmpty(tvdbId))
                {
                    var searchResult = await FindByExternalId(tvdbId, "tvdb_id", cancellationToken).ConfigureAwait(false);

                    if (searchResult != null)
                    {
                        tmdbId = searchResult.GetProviderId(MetadataProviders.Tmdb);
                    }
                }
            }

            if (string.IsNullOrEmpty(tmdbId))
            {
                var searchResults = await new MovieDbSearch(_logger, _jsonSerializer).GetSearchResults(info, cancellationToken).ConfigureAwait(false);

                var searchResult = searchResults.FirstOrDefault();

                if (searchResult != null)
                {
                    tmdbId = searchResult.GetProviderId(MetadataProviders.Tmdb);
                }
            }

            if (!string.IsNullOrEmpty(tmdbId))
            {
                cancellationToken.ThrowIfCancellationRequested();

                result.Item = await FetchMovieData(tmdbId, info.MetadataLanguage, info.MetadataCountryCode, cancellationToken).ConfigureAwait(false);

                result.HasMetadata = result.Item != null;
            }

            return result;
        }

        private async Task<Series> FetchMovieData(string tmdbId, string language, string preferredCountryCode, CancellationToken cancellationToken)
        {
            string dataFilePath = null;
            RootObject seriesInfo = null;

            if (!string.IsNullOrEmpty(tmdbId))
            {
                seriesInfo = await FetchMainResult(tmdbId, language, cancellationToken).ConfigureAwait(false);
            }

            if (seriesInfo == null)
            {
                return null;
            }

            tmdbId = seriesInfo.id.ToString(_usCulture);

            dataFilePath = GetDataFilePath(tmdbId, language);
            Directory.CreateDirectory(Path.GetDirectoryName(dataFilePath));
            _jsonSerializer.SerializeToFile(seriesInfo, dataFilePath);

            await EnsureSeriesInfo(tmdbId, language, cancellationToken).ConfigureAwait(false);

            var item = new Series();

            ProcessMainInfo(item, preferredCountryCode, seriesInfo);

            return item;
        }

        private void ProcessMainInfo(Series series, string countryCode, RootObject seriesInfo)
        {
            series.Name = seriesInfo.name;
            series.SetProviderId(MetadataProviders.Tmdb, seriesInfo.id.ToString(_usCulture));

            series.VoteCount = seriesInfo.vote_count;

            string voteAvg = seriesInfo.vote_average.ToString(CultureInfo.InvariantCulture);
            float rating;

            if (float.TryParse(voteAvg, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out rating))
            {
                series.CommunityRating = rating;
            }

            series.Overview = seriesInfo.overview;

            if (seriesInfo.networks != null)
            {
                series.Studios = seriesInfo.networks.Select(i => i.name).ToList();
            }

            if (seriesInfo.genres != null)
            {
                series.Genres = seriesInfo.genres.Select(i => i.name).ToList();
            }

            series.HomePageUrl = seriesInfo.homepage;

            series.RunTimeTicks = seriesInfo.episode_run_time.Select(i => TimeSpan.FromMinutes(i).Ticks).FirstOrDefault();

            if (string.Equals(seriesInfo.status, "Ended", StringComparison.OrdinalIgnoreCase))
            {
                series.Status = SeriesStatus.Ended;
                series.EndDate = seriesInfo.last_air_date;
            }
            else
            {
                series.Status = SeriesStatus.Continuing;
            }

            series.PremiereDate = seriesInfo.first_air_date;

            var ids = seriesInfo.external_ids;
            if (ids != null)
            {
                if (!string.IsNullOrWhiteSpace(ids.imdb_id))
                {
                    series.SetProviderId(MetadataProviders.Imdb, ids.imdb_id);
                }
                if (ids.tvrage_id > 0)
                {
                    series.SetProviderId(MetadataProviders.TvRage, ids.tvrage_id.ToString(_usCulture));
                }
                if (ids.tvdb_id > 0)
                {
                    series.SetProviderId(MetadataProviders.Tvdb, ids.tvdb_id.ToString(_usCulture));
                }
            }
        }

        internal static string GetSeriesDataPath(IApplicationPaths appPaths, string tmdbId)
        {
            var dataPath = GetSeriesDataPath(appPaths);

            return Path.Combine(dataPath, tmdbId);
        }

        internal static string GetSeriesDataPath(IApplicationPaths appPaths)
        {
            var dataPath = Path.Combine(appPaths.CachePath, "tmdb-tv");

            return dataPath;
        }

        internal async Task DownloadSeriesInfo(string id, string preferredMetadataLanguage, CancellationToken cancellationToken)
        {
            var mainResult = await FetchMainResult(id, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);

            if (mainResult == null) return;

            var dataFilePath = GetDataFilePath(id, preferredMetadataLanguage);

            Directory.CreateDirectory(Path.GetDirectoryName(dataFilePath));

            _jsonSerializer.SerializeToFile(mainResult, dataFilePath);
        }

        internal async Task<RootObject> FetchMainResult(string id, string language, CancellationToken cancellationToken)
        {
            var url = string.Format(GetTvInfo3, id, MovieDbProvider.ApiKey);

            var imageLanguages = _localization.GetCultures()
                .Select(i => i.TwoLetterISOLanguageName)
                .Distinct(StringComparer.OrdinalIgnoreCase)
                .ToList();

            imageLanguages.Add("null");

            if (!string.IsNullOrEmpty(language))
            {
                // If preferred language isn't english, get those images too
                if (imageLanguages.Contains(language, StringComparer.OrdinalIgnoreCase))
                {
                    imageLanguages.Add(language);
                }

                url += string.Format("&language={0}", language);
            }

            // Get images in english and with no language
            url += "&include_image_language=" + string.Join(",", imageLanguages.ToArray());

            cancellationToken.ThrowIfCancellationRequested();

            using (var json = await MovieDbProvider.Current.GetMovieDbResponse(new HttpRequestOptions
            {
                Url = url,
                CancellationToken = cancellationToken,
                AcceptHeader = MovieDbProvider.AcceptHeader

            }).ConfigureAwait(false))
            {
                return _jsonSerializer.DeserializeFromStream<RootObject>(json);
            }
        }

        private readonly Task _cachedTask = Task.FromResult(true);
        internal Task EnsureSeriesInfo(string tmdbId, string language, CancellationToken cancellationToken)
        {
            if (string.IsNullOrEmpty(tmdbId))
            {
                throw new ArgumentNullException("tmdbId");
            }
            if (string.IsNullOrEmpty(language))
            {
                throw new ArgumentNullException("language");
            }

            var path = GetDataFilePath(tmdbId, language);

            var fileInfo = _fileSystem.GetFileSystemInfo(path);

            if (fileInfo.Exists)
            {
                // If it's recent or automatic updates are enabled, don't re-download
                if ((DateTime.UtcNow - _fileSystem.GetLastWriteTimeUtc(fileInfo)).TotalDays <= 7)
                {
                    return _cachedTask;
                }
            }

            return DownloadSeriesInfo(tmdbId, language, cancellationToken);
        }

        internal string GetDataFilePath(string tmdbId, string preferredLanguage)
        {
            if (string.IsNullOrEmpty(tmdbId))
            {
                throw new ArgumentNullException("tmdbId");
            }
            if (string.IsNullOrEmpty(preferredLanguage))
            {
                throw new ArgumentNullException("preferredLanguage");
            }

            var path = GetSeriesDataPath(_configurationManager.ApplicationPaths, tmdbId);

            var filename = string.Format("series-{0}.json",
                preferredLanguage ?? string.Empty);

            return Path.Combine(path, filename);
        }

        public bool HasChanged(IHasMetadata item, DateTime date)
        {
            if (!_configurationManager.Configuration.EnableTmdbUpdates)
            {
                return false;
            }

            var tmdbId = item.GetProviderId(MetadataProviders.Tmdb);

            if (!String.IsNullOrEmpty(tmdbId))
            {
                // Process images
                var dataFilePath = GetDataFilePath(tmdbId, item.GetPreferredMetadataLanguage());

                var fileInfo = new FileInfo(dataFilePath);

                return !fileInfo.Exists || _fileSystem.GetLastWriteTimeUtc(fileInfo) > date;
            }

            return false;
        }

        private async Task<RemoteSearchResult> FindByExternalId(string id, string externalSource, CancellationToken cancellationToken)
        {
            var url = string.Format("http://api.themoviedb.org/3/tv/find/{0}?api_key={1}&external_source={2}",
                id,
                MovieDbProvider.ApiKey,
                externalSource);

            using (var json = await MovieDbProvider.Current.GetMovieDbResponse(new HttpRequestOptions
            {
                Url = url,
                CancellationToken = cancellationToken,
                AcceptHeader = MovieDbProvider.AcceptHeader

            }).ConfigureAwait(false))
            {
                var result = _jsonSerializer.DeserializeFromStream<MovieDbSearch.ExternalIdLookupResult>(json);

                if (result != null && result.tv_results != null)
                {
                    var tv = result.tv_results.FirstOrDefault();

                    if (tv != null)
                    {
                        var tmdbSettings = await MovieDbProvider.Current.GetTmdbSettings(cancellationToken).ConfigureAwait(false);
                        var tmdbImageUrl = tmdbSettings.images.base_url + "original";

                        var remoteResult = new RemoteSearchResult
                        {
                            Name = tv.name,
                            SearchProviderName = Name,
                            ImageUrl = string.IsNullOrWhiteSpace(tv.poster_path) ? null : tmdbImageUrl + tv.poster_path
                        };

                        remoteResult.SetProviderId(MetadataProviders.Tmdb, tv.id.ToString(_usCulture));

                        return remoteResult;
                    }
                }
            }

            return null;
        }

        public class CreatedBy
        {
            public int id { get; set; }
            public string name { get; set; }
            public string profile_path { get; set; }
        }

        public class Genre
        {
            public int id { get; set; }
            public string name { get; set; }
        }

        public class Network
        {
            public int id { get; set; }
            public string name { get; set; }
        }

        public class Season
        {
            public string air_date { get; set; }
            public string poster_path { get; set; }
            public int season_number { get; set; }
        }

        public class Backdrop
        {
            public double aspect_ratio { get; set; }
            public string file_path { get; set; }
            public int height { get; set; }
            public string iso_639_1 { get; set; }
            public double vote_average { get; set; }
            public int vote_count { get; set; }
            public int width { get; set; }
        }

        public class Poster
        {
            public double aspect_ratio { get; set; }
            public string file_path { get; set; }
            public int height { get; set; }
            public string iso_639_1 { get; set; }
            public double vote_average { get; set; }
            public int vote_count { get; set; }
            public int width { get; set; }
        }

        public class Images
        {
            public List<Backdrop> backdrops { get; set; }
            public List<Poster> posters { get; set; }
        }

        public class ExternalIds
        {
            public string imdb_id { get; set; }
            public string freebase_id { get; set; }
            public string freebase_mid { get; set; }
            public int tvdb_id { get; set; }
            public int tvrage_id { get; set; }
        }

        public class RootObject
        {
            public string backdrop_path { get; set; }
            public List<CreatedBy> created_by { get; set; }
            public List<int> episode_run_time { get; set; }
            public DateTime first_air_date { get; set; }
            public List<Genre> genres { get; set; }
            public string homepage { get; set; }
            public int id { get; set; }
            public bool in_production { get; set; }
            public List<string> languages { get; set; }
            public DateTime last_air_date { get; set; }
            public string name { get; set; }
            public List<Network> networks { get; set; }
            public int number_of_episodes { get; set; }
            public int number_of_seasons { get; set; }
            public string original_name { get; set; }
            public List<string> origin_country { get; set; }
            public string overview { get; set; }
            public string popularity { get; set; }
            public string poster_path { get; set; }
            public List<Season> seasons { get; set; }
            public string status { get; set; }
            public double vote_average { get; set; }
            public int vote_count { get; set; }
            public Images images { get; set; }
            public ExternalIds external_ids { get; set; }
        }

        public int Order
        {
            get
            {
                // After Omdb and Tvdb
                return 2;
            }
        }

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