using System;
using System.Collections.Generic;
using FluentValidation.Results;
using NLog;
using NzbDrone.Common.Disk;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Http;
using NzbDrone.Core.Configuration;
using NzbDrone.Core.Download.Clients.Hadouken.Models;
using NzbDrone.Core.Localization;
using NzbDrone.Core.MediaFiles.TorrentInfo;
using NzbDrone.Core.Parser.Model;
using NzbDrone.Core.RemotePathMappings;
using NzbDrone.Core.Validation;

namespace NzbDrone.Core.Download.Clients.Hadouken
{
    public class Hadouken : TorrentClientBase<HadoukenSettings>
    {
        private readonly IHadoukenProxy _proxy;

        public Hadouken(IHadoukenProxy proxy,
                        ITorrentFileInfoReader torrentFileInfoReader,
                        IHttpClient httpClient,
                        IConfigService configService,
                        IDiskProvider diskProvider,
                        IRemotePathMappingService remotePathMappingService,
                        Logger logger,
                        ILocalizationService localizationService)
            : base(torrentFileInfoReader, httpClient, configService, diskProvider, remotePathMappingService, logger, localizationService)
        {
            _proxy = proxy;
        }

        public override string Name => "Hadouken";

        public override IEnumerable<DownloadClientItem> GetItems()
        {
            var torrents = _proxy.GetTorrents(Settings);

            var items = new List<DownloadClientItem>();

            foreach (var torrent in torrents)
            {
                if (Settings.Category.IsNotNullOrWhiteSpace() && torrent.Label != Settings.Category)
                {
                    continue;
                }

                var outputPath = _remotePathMappingService.RemapRemoteToLocal(Settings.Host, new OsPath(torrent.SavePath));
                var eta = TimeSpan.FromSeconds(0);

                if (torrent.DownloadRate > 0 && torrent.TotalSize > 0)
                {
                    eta = TimeSpan.FromSeconds(torrent.TotalSize / (double)torrent.DownloadRate);
                }

                var item = new DownloadClientItem
                {
                    DownloadClientInfo = DownloadClientItemClientInfo.FromDownloadClient(this),
                    DownloadId = torrent.InfoHash.ToUpper(),
                    OutputPath = outputPath + torrent.Name,
                    RemainingSize = torrent.TotalSize - torrent.DownloadedBytes,
                    RemainingTime = eta,
                    Title = torrent.Name,
                    TotalSize = torrent.TotalSize,
                    SeedRatio = torrent.DownloadedBytes <= 0 ? 0 :
                        (double)torrent.UploadedBytes / torrent.DownloadedBytes
                };

                if (!string.IsNullOrEmpty(torrent.Error))
                {
                    item.Status = DownloadItemStatus.Warning;
                    item.Message = torrent.Error;
                }
                else if (torrent.IsFinished && torrent.State != HadoukenTorrentState.CheckingFiles)
                {
                    item.Status = DownloadItemStatus.Completed;
                }
                else if (torrent.State == HadoukenTorrentState.QueuedForChecking)
                {
                    item.Status = DownloadItemStatus.Queued;
                }
                else if (torrent.State == HadoukenTorrentState.Paused)
                {
                    item.Status = DownloadItemStatus.Paused;
                }
                else
                {
                    item.Status = DownloadItemStatus.Downloading;
                }

                item.CanMoveFiles = item.CanBeRemoved = torrent.IsFinished && torrent.State == HadoukenTorrentState.Paused;

                items.Add(item);
            }

            return items;
        }

        public override void RemoveItem(DownloadClientItem item, bool deleteData)
        {
            if (deleteData)
            {
                _proxy.RemoveTorrentAndData(Settings, item.DownloadId);
            }
            else
            {
                _proxy.RemoveTorrent(Settings, item.DownloadId);
            }
        }

        public override DownloadClientInfo GetStatus()
        {
            var config = _proxy.GetConfig(Settings);
            var destDir = new OsPath(config.GetValueOrDefault("bittorrent.defaultSavePath") as string);

            var status = new DownloadClientInfo
            {
                IsLocalhost = Settings.Host == "127.0.0.1" || Settings.Host == "localhost"
            };

            if (!destDir.IsEmpty)
            {
                status.OutputRootFolders = new List<OsPath> { _remotePathMappingService.RemapRemoteToLocal(Settings.Host, destDir) };
            }

            return status;
        }

        protected override void Test(List<ValidationFailure> failures)
        {
            failures.AddIfNotNull(TestConnection());
            if (failures.HasErrors())
            {
                return;
            }

            failures.AddIfNotNull(TestGetTorrents());
        }

        protected override string AddFromMagnetLink(RemoteEpisode remoteEpisode, string hash, string magnetLink)
        {
            _proxy.AddTorrentUri(Settings, magnetLink);

            return hash.ToUpper();
        }

        protected override string AddFromTorrentFile(RemoteEpisode remoteEpisode, string hash, string filename, byte[] fileContent)
        {
            return _proxy.AddTorrentFile(Settings, fileContent).ToUpper();
        }

        private ValidationFailure TestConnection()
        {
            try
            {
                var sysInfo = _proxy.GetSystemInfo(Settings);
                var version = new Version(sysInfo.Versions["hadouken"]);

                if (version < new Version("5.1"))
                {
                    return new ValidationFailure(string.Empty,
                        _localizationService.GetLocalizedString("DownloadClientValidationErrorVersion",
                            new Dictionary<string, object>
                                { { "clientName", Name }, { "requiredVersion", "5.1" }, { "reportedVersion", version } }));
                }
            }
            catch (DownloadClientAuthenticationException ex)
            {
                _logger.Error(ex, ex.Message);

                return new NzbDroneValidationFailure("Password", _localizationService.GetLocalizedString("DownloadClientValidationAuthenticationFailure"));
            }
            catch (Exception ex)
            {
                return new NzbDroneValidationFailure("Host", _localizationService.GetLocalizedString("DownloadClientValidationUnableToConnect"))
                       {
                           DetailedDescription = ex.Message
                       };
            }

            return null;
        }

        private ValidationFailure TestGetTorrents()
        {
            try
            {
                _proxy.GetTorrents(Settings);
            }
            catch (Exception ex)
            {
                _logger.Error(ex, ex.Message);
                return new NzbDroneValidationFailure(string.Empty, _localizationService.GetLocalizedString("DownloadClientValidationTestTorrents", new Dictionary<string, object> { { "exceptionMessage", ex.Message } }));
            }

            return null;
        }
    }
}