using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Dlna;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.Plugins;
using MediaBrowser.Model.Extensions;
using MediaBrowser.Model.LiveTv;
using MediaBrowser.Model.Logging;

namespace MediaBrowser.Server.Implementations.LiveTv.TunerHosts.SatIp
{
    public class SatIpDiscovery : IServerEntryPoint
    {
        private readonly IDeviceDiscovery _deviceDiscovery;
        private readonly IServerConfigurationManager _config;
        private readonly ILogger _logger;
        private readonly ILiveTvManager _liveTvManager;
        private readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
        private readonly IHttpClient _httpClient;

        public SatIpDiscovery(IDeviceDiscovery deviceDiscovery, IServerConfigurationManager config, ILogger logger, ILiveTvManager liveTvManager, IHttpClient httpClient)
        {
            _deviceDiscovery = deviceDiscovery;
            _config = config;
            _logger = logger;
            _liveTvManager = liveTvManager;
            _httpClient = httpClient;
        }

        public void Run()
        {
            _deviceDiscovery.DeviceDiscovered += _deviceDiscovery_DeviceDiscovered;
        }

        void _deviceDiscovery_DeviceDiscovered(object sender, SsdpMessageEventArgs e)
        {
            string st = null;
            if (e.Headers.TryGetValue("ST", out st) && string.Equals(st, "urn:ses-com:device:SatIPServer:1", StringComparison.OrdinalIgnoreCase))
            {
                string location;
                if (e.Headers.TryGetValue("Location", out location) && !string.IsNullOrWhiteSpace(location))
                {
                    _logger.Debug("SAT IP found at {0}", location);

                    // Just get the beginning of the url
                    AddDevice(location);
                }
            }
        }

        private async void AddDevice(string location)
        {
            await _semaphore.WaitAsync().ConfigureAwait(false);

            try
            {
                var options = GetConfiguration();

                //if (options.TunerHosts.Any(i =>
                //            string.Equals(i.Type, SatIpHost.DeviceType, StringComparison.OrdinalIgnoreCase) &&
                //            UriEquals(i.Url, url)))
                //{
                //    return;
                //}

                //// Strip off the port
                //url = new Uri(url).GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Port, UriFormat.UriEscaped).TrimEnd('/');

                //await TestUrl(url).ConfigureAwait(false);

                //await _liveTvManager.SaveTunerHost(new TunerHostInfo
                //{
                //    Type = SatIpHost.DeviceType,
                //    Url = url

                //}).ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                _logger.ErrorException("Error saving device", ex);
            }
            finally
            {
                _semaphore.Release();
            }
        }

        private async Task TestUrl(string url)
        {
            // Test it by pulling down the lineup
            using (await _httpClient.Get(new HttpRequestOptions
            {
                Url = string.Format("{0}/lineup.json", url),
                CancellationToken = CancellationToken.None
            }))
            {
            }
        }

        private bool UriEquals(string savedUri, string location)
        {
            return string.Equals(NormalizeUrl(location), NormalizeUrl(savedUri), StringComparison.OrdinalIgnoreCase);
        }

        private string NormalizeUrl(string url)
        {
            if (!url.StartsWith("http", StringComparison.OrdinalIgnoreCase))
            {
                url = "http://" + url;
            }

            url = url.TrimEnd('/');

            // Strip off the port
            return new Uri(url).GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Port, UriFormat.UriEscaped);
        }

        private LiveTvOptions GetConfiguration()
        {
            return _config.GetConfiguration<LiveTvOptions>("livetv");
        }

        public void Dispose()
        {
        }
    }
}