using AutoMapper;

using Ombi.Api.Trakt;
using Ombi.Api.TvMaze;
using Ombi.Core.Engine.Interfaces;
using Ombi.Core.Models.Requests;
using Ombi.Core.Models.Search;
using Ombi.Core.Settings;
using Ombi.Core.Settings.Models.External;
using Ombi.Store.Repository;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Principal;
using System.Threading.Tasks;
using Ombi.Core.Rule.Interfaces;
using Ombi.Store.Entities.Requests;
using Ombi.Store.Repository.Requests;
using Ombi.Store.Entities;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using Ombi.Core.Authentication;
using Ombi.Helpers;

namespace Ombi.Core.Engine
{
    public class TvSearchEngine : BaseMediaEngine, ITvSearchEngine
    {
        public TvSearchEngine(IPrincipal identity, IRequestServiceMain service, ITvMazeApi tvMaze, IMapper mapper, ISettingsService<PlexSettings> plexSettings,
            ISettingsService<EmbySettings> embySettings, IPlexContentRepository repo, IEmbyContentRepository embyRepo, ITraktApi trakt, IRuleEvaluator r, OmbiUserManager um,
            IMemoryCache memCache)
            : base(identity, service, r, um)
        {
            TvMazeApi = tvMaze;
            Mapper = mapper;
            PlexSettings = plexSettings;
            EmbySettings = embySettings;
            PlexContentRepo = repo;
            TraktApi = trakt;
            EmbyContentRepo = embyRepo;
            MemCache = memCache;
        }

        private ITvMazeApi TvMazeApi { get; }
        private IMapper Mapper { get; }
        private ISettingsService<PlexSettings> PlexSettings { get; }
        private ISettingsService<EmbySettings> EmbySettings { get; }
        private IPlexContentRepository PlexContentRepo { get; }
        private IEmbyContentRepository EmbyContentRepo { get; }
        private ITraktApi TraktApi { get; }
        private IMemoryCache MemCache { get; }

        public async Task<IEnumerable<SearchTvShowViewModel>> Search(string searchTerm)
        {
            var searchResult = await TvMazeApi.Search(searchTerm);

            if (searchResult != null)
            {
                return await ProcessResults(searchResult);
            }
            return null;
        }

        public async Task<IEnumerable<TreeNode<SearchTvShowViewModel>>> SearchTreeNode(string searchTerm)
        {
            var result = await Search(searchTerm);
            return result.Select(ParseIntoTreeNode).ToList();
        }
        public async Task<SearchTvShowViewModel> GetShowInformation(int tvdbid)
        {
            var show = await TvMazeApi.ShowLookupByTheTvDbId(tvdbid);
            if (show == null)
            { 
                // We don't have enough information
                return null;
            }
            var episodes = await TvMazeApi.EpisodeLookup(show.id);
            if (episodes == null || !episodes.Any())
            {
                // We don't have enough information
                return null;
            }

            var mapped = Mapper.Map<SearchTvShowViewModel>(show);

            foreach (var e in episodes)
            {
                var season = mapped.SeasonRequests.FirstOrDefault(x => x.SeasonNumber == e.season);
                if (season == null)
                {
                    var newSeason = new SeasonRequests
                    {
                        SeasonNumber = e.season,
                        Episodes = new List<EpisodeRequests>()
                    };
                    newSeason.Episodes.Add(new EpisodeRequests
                    {
                        Url = e.url,
                        Title = e.name,
                        AirDate = DateTime.Parse(e.airstamp ?? DateTime.MinValue.ToString()),
                        EpisodeNumber = e.number,

                    });
                    mapped.SeasonRequests.Add(newSeason);
                }
                else
                {
                    // We already have the season, so just add the episode
                    season.Episodes.Add(new EpisodeRequests
                    {
                        Url = e.url,
                        Title = e.name,
                        AirDate = DateTime.Parse(e.airstamp ?? DateTime.MinValue.ToString()),
                        EpisodeNumber = e.number,
                    });
                }
            }

            var existingRequests = await GetTvRequests();
            var plexSettings = await PlexSettings.GetSettingsAsync();
            var embySettings = await EmbySettings.GetSettingsAsync();
            return await ProcessResult(mapped, existingRequests, plexSettings, embySettings);
        }

        public async Task<TreeNode<SearchTvShowViewModel>> GetShowInformationTreeNode(int tvdbid)
        {
            var result = await GetShowInformation(tvdbid);
            return ParseIntoTreeNode(result);
        }

        public async Task<IEnumerable<TreeNode<SearchTvShowViewModel>>> Popular()
        {
            var result = await MemCache.GetOrCreateAsync(CacheKeys.PopularTv, async entry =>
            {
                entry.AbsoluteExpiration = DateTimeOffset.Now.AddHours(12);
                return await TraktApi.GetPopularShows();
            });
            var processed = await ProcessResults(result);
            return processed.Select(ParseIntoTreeNode).ToList();
        }

        public async Task<IEnumerable<TreeNode<SearchTvShowViewModel>>> Anticipated()
        {
            var result = await MemCache.GetOrCreateAsync(CacheKeys.AnticipatedTv, async entry =>
            {
                entry.AbsoluteExpiration = DateTimeOffset.Now.AddHours(12);
                return await TraktApi.GetAnticipatedShows();
            });
            var processed= await ProcessResults(result);
            return processed.Select(ParseIntoTreeNode).ToList();
        }

        public async Task<IEnumerable<TreeNode<SearchTvShowViewModel>>> MostWatches()
        {
            var result = await MemCache.GetOrCreateAsync(CacheKeys.MostWatchesTv, async entry =>
            {
                entry.AbsoluteExpiration = DateTimeOffset.Now.AddHours(12);
                return await TraktApi.GetMostWatchesShows();
            });
            var processed = await ProcessResults(result);
            return processed.Select(ParseIntoTreeNode).ToList();
        }

        public async Task<IEnumerable<TreeNode<SearchTvShowViewModel>>> Trending()
        {
            var result = await MemCache.GetOrCreateAsync(CacheKeys.TrendingTv, async entry =>
            {
                entry.AbsoluteExpiration = DateTimeOffset.Now.AddHours(12);
                return await TraktApi.GetTrendingShows();
            });
            var processed = await ProcessResults(result);
            return processed.Select(ParseIntoTreeNode).ToList();
        }
        private static TreeNode<SearchTvShowViewModel> ParseIntoTreeNode(SearchTvShowViewModel result)
        {
            return new TreeNode<SearchTvShowViewModel>
            {
                Data = result,
                Children = new List<TreeNode<SearchTvShowViewModel>>
                {
                    new TreeNode<SearchTvShowViewModel>
                    {
                        Data = result, Leaf = true
                    }
                },
                Leaf = false
            };
        }


        private async Task<IEnumerable<SearchTvShowViewModel>> ProcessResults<T>(IEnumerable<T> items)
        {
            var existingRequests = await GetTvRequests();

            var plexSettings = await PlexSettings.GetSettingsAsync();
            var embySettings = await EmbySettings.GetSettingsAsync();

            var retVal = new List<SearchTvShowViewModel>();
            foreach (var tvMazeSearch in items)
            {
                var viewT = Mapper.Map<SearchTvShowViewModel>(tvMazeSearch);
                retVal.Add(await ProcessResult(viewT, existingRequests, plexSettings, embySettings));
            }
            return retVal;
        }

        private async Task<SearchTvShowViewModel> ProcessResult(SearchTvShowViewModel item, Dictionary<int, TvRequests> existingRequests, PlexSettings plexSettings, EmbySettings embySettings)
        {
            if (embySettings.Enable)
            {
                var content = await EmbyContentRepo.Get(item.Id.ToString());

                if (content != null)
                {
                    item.Available = true;
                }

                // Let's go through the episodes now
                if (item.SeasonRequests.Any())
                {
                    var allEpisodes = EmbyContentRepo.GetAllEpisodes().Include(x => x.Series);
                    foreach (var season in item.SeasonRequests)
                    {
                        foreach (var episode in season.Episodes)
                        {
                            var epExists = await allEpisodes.FirstOrDefaultAsync(x =>
                                x.EpisodeNumber == episode.EpisodeNumber && x.SeasonNumber == season.SeasonNumber && item.Id.ToString() == x.Series.ProviderId);
                            if (epExists != null)
                            {
                                episode.Available = true;
                            }
                        }
                    }
                }
            }
            if (plexSettings.Enable)
            {
                var content = await PlexContentRepo.Get(item.Id.ToString());

                if (content != null)
                {
                    item.Available = true;
                    item.PlexUrl = content.Url;
                }
                // Let's go through the episodes now
                if (item.SeasonRequests.Any())
                {
                    var allEpisodes = PlexContentRepo.GetAllEpisodes();
                    foreach (var season in item.SeasonRequests)
                    {
                        foreach (var episode in season.Episodes)
                        {
                            var epExists = await allEpisodes.FirstOrDefaultAsync(x =>
                                x.EpisodeNumber == episode.EpisodeNumber && x.SeasonNumber == season.SeasonNumber && x.Series.ProviderId == item.Id.ToString());
                            if (epExists != null)
                            {
                                episode.Available = true;
                            }
                        }
                    }
                }
            }

            if (item.SeasonRequests.Any() && item.SeasonRequests.All(x => x.Episodes.All(e => e.Approved)))
            {
                item.FullyAvailable = true;
            }

            if (item.Id > 0)
            {
                var tvdbid = item.Id;
                if (existingRequests.ContainsKey(tvdbid))
                {
                    var existingRequest = existingRequests[tvdbid];

                    item.Requested = true;
                    item.Approved = existingRequest.ChildRequests.Any(x => x.Approved);

                    // Let's modify the seasonsrequested to reflect what we have requested...
                    foreach (var season in item.SeasonRequests)
                    {
                        foreach (var existingRequestChildRequest in existingRequest.ChildRequests)
                        {
                            // Find the existing request season
                            var existingSeason =
                                existingRequestChildRequest.SeasonRequests.FirstOrDefault(x => x.SeasonNumber == season.SeasonNumber);
                            if (existingSeason == null) continue;

                            foreach (var ep in existingSeason.Episodes)
                            {
                                // Find the episode from what we are searching
                                var episodeSearching = season.Episodes.FirstOrDefault(x => x.EpisodeNumber == ep.EpisodeNumber);
                                if (episodeSearching == null)
                                {
                                    continue;
                                }
                                episodeSearching.Requested = true;
                                episodeSearching.Available = ep.Available;
                                episodeSearching.Approved = ep.Season.ChildRequest.Approved;
                            }
                        }
                    }
                }
                // TODO CHECK SONARR/RADARR
                //if (sonarrCached.Select(x => x.TvdbId).Contains(tvdbid) || sickRageCache.Contains(tvdbid))
                //    // compare to the sonarr/sickrage db
                //{
                //    item.Requested = true;
                //}
            }

            return item;
        }
    }
}