using System;
using System.Linq;
using FluentValidation.Results;
using NLog;
using NzbDrone.Core.Tv;

namespace NzbDrone.Core.Notifications.Xbmc
{
    public interface IXbmcService
    {
        void Notify(XbmcSettings settings, string title, string message);
        void Update(XbmcSettings settings, Series series);
        void Clean(XbmcSettings settings);
        ValidationFailure Test(XbmcSettings settings, string message);
    }

    public class XbmcService : IXbmcService
    {
        private readonly IXbmcJsonApiProxy _proxy;
        private readonly Logger _logger;

        public XbmcService(IXbmcJsonApiProxy proxy,
                           Logger logger)
        {
            _proxy = proxy;
            _logger = logger;
        }

        public void Notify(XbmcSettings settings, string title, string message)
        {
            _proxy.Notify(settings, title, message);
        }

        public void Update(XbmcSettings settings, Series series)
        {
            if (CheckIfVideoPlayerOpen(settings))
            {
                _logger.Debug("Video is currently playing, skipping library update");

                return;
            }

            UpdateLibrary(settings, series);
        }

        public void Clean(XbmcSettings settings)
        {
            if (CheckIfVideoPlayerOpen(settings))
            {
                _logger.Debug("Video is currently playing, skipping library clean");

                return;
            }

            _proxy.CleanLibrary(settings);
        }

        public string GetSeriesPath(XbmcSettings settings, Series series)
        {
            var allSeries = _proxy.GetSeries(settings);

            if (!allSeries.Any())
            {
                _logger.Debug("No TV shows returned from Kodi");
                return null;
            }

            var matchingSeries = allSeries.FirstOrDefault(s =>
            {
                int.TryParse(s.ImdbNumber, out var tvdbId);

                return tvdbId == series.TvdbId || s.Label == series.Title;
            });

            if (matchingSeries != null)
            {
                return matchingSeries.File;
            }

            return null;
        }

        private void UpdateLibrary(XbmcSettings settings, Series series)
        {
            try
            {
                var seriesPath = GetSeriesPath(settings, series);

                if (seriesPath != null)
                {
                    _logger.Debug("Updating series {0} (Path: {1}) on Kodi host: {2}", series, seriesPath, settings.Address);
                }
                else
                {
                    _logger.Debug("Series {0} doesn't exist on Kodi host: {1}, Updating Entire Library", series, settings.Address);
                }

                var response = _proxy.UpdateLibrary(settings, seriesPath);

                if (!response.Equals("OK", StringComparison.InvariantCultureIgnoreCase))
                {
                    _logger.Debug("Failed to update library for: {0}", settings.Address);
                }
            }
            catch (Exception ex)
            {
                _logger.Debug(ex, ex.Message);
            }
        }

        private bool CheckIfVideoPlayerOpen(XbmcSettings settings)
        {
            if (settings.AlwaysUpdate)
            {
                return false;
            }

            _logger.Debug("Determining if there are any active players on Kodi host: {0}", settings.Address);
            var activePlayers = _proxy.GetActivePlayers(settings);

            return activePlayers.Any(a => a.Type.Equals("video"));
        }

        public ValidationFailure Test(XbmcSettings settings, string message)
        {
            try
            {
                Notify(settings, "Test Notification", message);
            }
            catch (Exception ex)
            {
                _logger.Error(ex, "Unable to send test message");
                return new ValidationFailure("Host", "Unable to send test message");
            }

            return null;
        }
    }
}