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

namespace MediaBrowser.Providers.Omdb
{
    public class OmdbProvider
    {
        private readonly IJsonSerializer _jsonSerializer;
        private readonly IFileSystem _fileSystem;
        private readonly IServerConfigurationManager _configurationManager;
        private readonly IHttpClient _httpClient;
        private readonly CultureInfo _usCulture = new CultureInfo("en-US");

        public OmdbProvider(IJsonSerializer jsonSerializer, IHttpClient httpClient, IFileSystem fileSystem, IServerConfigurationManager configurationManager)
        {
            _jsonSerializer = jsonSerializer;
            _httpClient = httpClient;
            _fileSystem = fileSystem;
            _configurationManager = configurationManager;
        }

        public async Task Fetch<T>(MetadataResult<T> itemResult, string imdbId, string language, string country, CancellationToken cancellationToken)
            where T : BaseItem
        {
            if (string.IsNullOrWhiteSpace(imdbId))
            {
                throw new ArgumentNullException("imdbId");
            }

            T item = itemResult.Item;

            var result = await GetRootObject(imdbId, cancellationToken).ConfigureAwait(false);

            // Only take the name and rating if the user's language is set to english, since Omdb has no localization
            if (string.Equals(language, "en", StringComparison.OrdinalIgnoreCase))
            {
                item.Name = result.Title;

                if (string.Equals(country, "us", StringComparison.OrdinalIgnoreCase))
                {
                    item.OfficialRating = result.Rated;
                }
            }

            int year;

            if (!string.IsNullOrEmpty(result.Year) && result.Year.Length >= 4
                && int.TryParse(result.Year.Substring(0, 4), NumberStyles.Number, _usCulture, out year)
                && year >= 0)
            {
                item.ProductionYear = year;
            }

            var tomatoScore = result.GetRottenTomatoScore();

            if (tomatoScore.HasValue)
            {
                item.CriticRating = tomatoScore;
            }

            int voteCount;

            if (!string.IsNullOrEmpty(result.imdbVotes)
                && int.TryParse(result.imdbVotes, NumberStyles.Number, _usCulture, out voteCount)
                && voteCount >= 0)
            {
                item.VoteCount = voteCount;
            }

            float imdbRating;

            if (!string.IsNullOrEmpty(result.imdbRating)
                && float.TryParse(result.imdbRating, NumberStyles.Any, _usCulture, out imdbRating)
                && imdbRating >= 0)
            {
                item.CommunityRating = imdbRating;
            }

            if (!string.IsNullOrEmpty(result.Website))
            {
                item.HomePageUrl = result.Website;
            }

            if (!string.IsNullOrWhiteSpace(result.imdbID))
            {
                item.SetProviderId(MetadataProviders.Imdb, result.imdbID);
            }

            ParseAdditionalMetadata(itemResult, result);
        }

        public async Task<bool> FetchEpisodeData<T>(MetadataResult<T> itemResult, int episodeNumber, int seasonNumber, string episodeImdbId, string seriesImdbId, string language, string country, CancellationToken cancellationToken)
            where T : BaseItem
        {
            if (string.IsNullOrWhiteSpace(seriesImdbId))
            {
                throw new ArgumentNullException("seriesImdbId");
            }

            T item = itemResult.Item;

            var seasonResult = await GetSeasonRootObject(seriesImdbId, seasonNumber, cancellationToken).ConfigureAwait(false);

            if (seasonResult == null)
            {
                return false;
            }

            RootObject result = null;

            if (!string.IsNullOrWhiteSpace(episodeImdbId))
            {
                foreach (var episode in (seasonResult.Episodes ?? new RootObject[] { }))
                {
                    if (string.Equals(episodeImdbId, episode.imdbID, StringComparison.OrdinalIgnoreCase))
                    {
                        result = episode;
                        break;
                    }
                }
            }

            // finally, search by numbers
            if (result == null)
            {
                foreach (var episode in (seasonResult.Episodes ?? new RootObject[] { }))
                {
                    if (episode.Episode == episodeNumber)
                    {
                        result = episode;
                        break;
                    }
                }
            }

            if (result == null)
            {
                return false;
            }

            // Only take the name and rating if the user's language is set to english, since Omdb has no localization
            if (string.Equals(language, "en", StringComparison.OrdinalIgnoreCase))
            {
                item.Name = result.Title;

                if (string.Equals(country, "us", StringComparison.OrdinalIgnoreCase))
                {
                    item.OfficialRating = result.Rated;
                }
            }

            int year;

            if (!string.IsNullOrEmpty(result.Year) && result.Year.Length >= 4
                && int.TryParse(result.Year.Substring(0, 4), NumberStyles.Number, _usCulture, out year)
                && year >= 0)
            {
                item.ProductionYear = year;
            }

            var tomatoScore = result.GetRottenTomatoScore();

            if (tomatoScore.HasValue)
            {
                item.CriticRating = tomatoScore;
            }

            int voteCount;

            if (!string.IsNullOrEmpty(result.imdbVotes)
                && int.TryParse(result.imdbVotes, NumberStyles.Number, _usCulture, out voteCount)
                && voteCount >= 0)
            {
                item.VoteCount = voteCount;
            }

            float imdbRating;

            if (!string.IsNullOrEmpty(result.imdbRating)
                && float.TryParse(result.imdbRating, NumberStyles.Any, _usCulture, out imdbRating)
                && imdbRating >= 0)
            {
                item.CommunityRating = imdbRating;
            }

            if (!string.IsNullOrEmpty(result.Website))
            {
                item.HomePageUrl = result.Website;
            }

            if (!string.IsNullOrWhiteSpace(result.imdbID))
            {
                item.SetProviderId(MetadataProviders.Imdb, result.imdbID);
            }

            ParseAdditionalMetadata(itemResult, result);

            return true;
        }

        internal async Task<RootObject> GetRootObject(string imdbId, CancellationToken cancellationToken)
        {
            var path = await EnsureItemInfo(imdbId, cancellationToken).ConfigureAwait(false);

            string resultString;

            using (Stream stream = _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read))
            {
                using (var reader = new StreamReader(stream, new UTF8Encoding(false)))
                {
                    resultString = reader.ReadToEnd();
                    resultString = resultString.Replace("\"N/A\"", "\"\"");
                }
            }

            var result = _jsonSerializer.DeserializeFromString<RootObject>(resultString);
            return result;
        }

        internal async Task<SeasonRootObject> GetSeasonRootObject(string imdbId, int seasonId, CancellationToken cancellationToken)
        {
            var path = await EnsureSeasonInfo(imdbId, seasonId, cancellationToken).ConfigureAwait(false);

            string resultString;

            using (Stream stream = _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read))
            {
                using (var reader = new StreamReader(stream, new UTF8Encoding(false)))
                {
                    resultString = reader.ReadToEnd();
                    resultString = resultString.Replace("\"N/A\"", "\"\"");
                }
            }

            var result = _jsonSerializer.DeserializeFromString<SeasonRootObject>(resultString);
            return result;
        }

        internal static bool IsValidSeries(Dictionary<string, string> seriesProviderIds)
        {
            string id;
            if (seriesProviderIds.TryGetValue(MetadataProviders.Imdb.ToString(), out id) && !string.IsNullOrEmpty(id))
            {
                // This check should ideally never be necessary but we're seeing some cases of this and haven't tracked them down yet.
                if (!string.IsNullOrWhiteSpace(id))
                {
                    return true;
                }
            }

            return false;
        }

        public static string GetOmdbUrl(string query, CancellationToken cancellationToken)
        {
            var url = "https://www.omdbapi.com?apikey=fe53f97e";

            if (!string.IsNullOrWhiteSpace(query))
            {
                url += "&" + query;
            }

            return url;
        }

        private async Task<string> EnsureItemInfo(string imdbId, CancellationToken cancellationToken)
        {
            if (string.IsNullOrWhiteSpace(imdbId))
            {
                throw new ArgumentNullException("imdbId");
            }

            var imdbParam = imdbId.StartsWith("tt", StringComparison.OrdinalIgnoreCase) ? imdbId : "tt" + imdbId;

            var path = GetDataFilePath(imdbParam);

            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 <= 3)
                {
                    return path;
                }
            }

            var url = GetOmdbUrl(string.Format("i={0}&plot=full&tomatoes=true&r=json", imdbParam), cancellationToken);

            using (var stream = await GetOmdbResponse(_httpClient, url, cancellationToken).ConfigureAwait(false))
            {
                var rootObject = _jsonSerializer.DeserializeFromStream<RootObject>(stream);
                _fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(path));
                _jsonSerializer.SerializeToFile(rootObject, path);
            }

            return path;
        }

        private async Task<string> EnsureSeasonInfo(string seriesImdbId, int seasonId, CancellationToken cancellationToken)
        {
            if (string.IsNullOrWhiteSpace(seriesImdbId))
            {
                throw new ArgumentNullException("imdbId");
            }

            var imdbParam = seriesImdbId.StartsWith("tt", StringComparison.OrdinalIgnoreCase) ? seriesImdbId : "tt" + seriesImdbId;

            var path = GetSeasonFilePath(imdbParam, seasonId);

            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 <= 3)
                {
                    return path;
                }
            }

            var url = GetOmdbUrl(string.Format("i={0}&season={1}&detail=full", imdbParam, seasonId), cancellationToken);

            using (var stream = await GetOmdbResponse(_httpClient, url, cancellationToken).ConfigureAwait(false))
            {
                var rootObject = _jsonSerializer.DeserializeFromStream<SeasonRootObject>(stream);
                _fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(path));
                _jsonSerializer.SerializeToFile(rootObject, path);
            }

            return path;
        }

        public static Task<Stream> GetOmdbResponse(IHttpClient httpClient, string url, CancellationToken cancellationToken)
        {
            return httpClient.Get(new HttpRequestOptions
            {
                Url = url,
                CancellationToken = cancellationToken,
                BufferContent = true,
                EnableDefaultUserAgent = true
            });
        }

        internal string GetDataFilePath(string imdbId)
        {
            if (string.IsNullOrEmpty(imdbId))
            {
                throw new ArgumentNullException("imdbId");
            }

            var dataPath = Path.Combine(_configurationManager.ApplicationPaths.CachePath, "omdb");

            var filename = string.Format("{0}.json", imdbId);

            return Path.Combine(dataPath, filename);
        }

        internal string GetSeasonFilePath(string imdbId, int seasonId)
        {
            if (string.IsNullOrEmpty(imdbId))
            {
                throw new ArgumentNullException("imdbId");
            }

            var dataPath = Path.Combine(_configurationManager.ApplicationPaths.CachePath, "omdb");

            var filename = string.Format("{0}_season_{1}.json", imdbId, seasonId);

            return Path.Combine(dataPath, filename);
        }

        private void ParseAdditionalMetadata<T>(MetadataResult<T> itemResult, RootObject result)
            where T : BaseItem
        {
            T item = itemResult.Item;

            var isConfiguredForEnglish = IsConfiguredForEnglish(item);

            // Grab series genres because imdb data is better than tvdb. Leave movies alone
            // But only do it if english is the preferred language because this data will not be localized
            if (isConfiguredForEnglish && !string.IsNullOrWhiteSpace(result.Genre))
            {
                item.Genres.Clear();

                foreach (var genre in result.Genre
                    .Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(i => i.Trim())
                    .Where(i => !string.IsNullOrWhiteSpace(i)))
                {
                    item.AddGenre(genre);
                }
            }

            if (isConfiguredForEnglish)
            {
                // Omdb is currently english only, so for other languages skip this and let secondary providers fill it in
                item.Overview = result.Plot;
            }

            //if (!string.IsNullOrWhiteSpace(result.Director))
            //{
            //    var person = new PersonInfo
            //    {
            //        Name = result.Director.Trim(),
            //        Type = PersonType.Director
            //    };

            //    itemResult.AddPerson(person);
            //}

            //if (!string.IsNullOrWhiteSpace(result.Writer))
            //{
            //    var person = new PersonInfo
            //    {
            //        Name = result.Director.Trim(),
            //        Type = PersonType.Writer
            //    };

            //    itemResult.AddPerson(person);
            //}

            //if (!string.IsNullOrWhiteSpace(result.Actors))
            //{
            //    var actorList = result.Actors.Split(',');
            //    foreach (var actor in actorList)
            //    {
            //        if (!string.IsNullOrWhiteSpace(actor))
            //        {
            //            var person = new PersonInfo
            //            {
            //                Name = actor.Trim(),
            //                Type = PersonType.Actor
            //            };

            //            itemResult.AddPerson(person);
            //        }
            //    }
            //}
        }

        private bool IsConfiguredForEnglish(BaseItem item)
        {
            var lang = item.GetPreferredMetadataLanguage();

            // The data isn't localized and so can only be used for english users
            return string.Equals(lang, "en", StringComparison.OrdinalIgnoreCase);
        }

        internal class SeasonRootObject
        {
            public string Title { get; set; }
            public string seriesID { get; set; }
            public int Season { get; set; }
            public int? totalSeasons { get; set; }
            public RootObject[] Episodes { get; set; }
            public string Response { get; set; }
        }

        internal class RootObject
        {
            public string Title { get; set; }
            public string Year { get; set; }
            public string Rated { get; set; }
            public string Released { get; set; }
            public string Runtime { get; set; }
            public string Genre { get; set; }
            public string Director { get; set; }
            public string Writer { get; set; }
            public string Actors { get; set; }
            public string Plot { get; set; }
            public string Language { get; set; }
            public string Country { get; set; }
            public string Awards { get; set; }
            public string Poster { get; set; }
            public List<OmdbRating> Ratings { get; set; }
            public string Metascore { get; set; }
            public string imdbRating { get; set; }
            public string imdbVotes { get; set; }
            public string imdbID { get; set; }
            public string Type { get; set; }
            public string DVD { get; set; }
            public string BoxOffice { get; set; }
            public string Production { get; set; }
            public string Website { get; set; }
            public string Response { get; set; }
            public int Episode { get; set; }

            public float? GetRottenTomatoScore()
            {
                if (Ratings != null)
                {
                    var rating = Ratings.FirstOrDefault(i => string.Equals(i.Source, "Rotten Tomatoes", StringComparison.OrdinalIgnoreCase));
                    if (rating != null && rating.Value != null)
                    {
                        var value = rating.Value.TrimEnd('%');
                        float score;
                        if (float.TryParse(value, NumberStyles.Any, CultureInfo.InvariantCulture, out score))
                        {
                            return score;
                        }
                    }
                }
                return null;
            }
        }
        public class OmdbRating
        {
            public string Source { get; set; }
            public string Value { get; set; }
        }
    }
}