using IW4MAdmin.Application.API.Master;
using RestEase;
using SharedLibraryCore;
using SharedLibraryCore.Configuration;
using SharedLibraryCore.Helpers;
using SharedLibraryCore.Interfaces;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using ILogger = Microsoft.Extensions.Logging.ILogger;

namespace IW4MAdmin.Application.Misc
{
    /// <summary>
    /// implementation of IMasterCommunication
    /// talks to the master server
    /// </summary>
    class MasterCommunication : IMasterCommunication
    {
        private readonly ILogger _logger;
        private readonly ITranslationLookup _transLookup;
        private readonly IMasterApi _apiInstance;
        private readonly IManager _manager;
        private readonly ApplicationConfiguration _appConfig;
        private readonly BuildNumber _fallbackVersion = BuildNumber.Parse("99.99.99.99");
        private readonly int _apiVersion = 1;
        private bool firstHeartBeat = true;

        public MasterCommunication(ILogger<MasterCommunication> logger, ApplicationConfiguration appConfig, ITranslationLookup translationLookup, IMasterApi apiInstance, IManager manager)
        {
            _logger = logger;
            _transLookup = translationLookup;
            _apiInstance = apiInstance;
            _appConfig = appConfig;
            _manager = manager;
        }

        /// <summary>
        /// checks for latest version of the application
        /// notifies user if an update is available
        /// </summary>
        /// <returns></returns>
        public async Task CheckVersion()
        {
            var version = new VersionInfo()
            {
                CurrentVersionStable = _fallbackVersion
            };

            try
            {
                version = await _apiInstance.GetVersion(_apiVersion);
            }

            catch (Exception e)
            {
                _logger.LogWarning(e, "Unable to retrieve IW4MAdmin version information");
            }

            if (version.CurrentVersionStable == _fallbackVersion)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(_transLookup["MANAGER_VERSION_FAIL"]);
                Console.ForegroundColor = ConsoleColor.Gray;
            }

#if !PRERELEASE
            else if (version.CurrentVersionStable > Program.Version)
            {
                Console.ForegroundColor = ConsoleColor.DarkYellow;
                Console.WriteLine($"IW4MAdmin {_transLookup["MANAGER_VERSION_UPDATE"]} [v{version.CurrentVersionStable.ToString()}]");
                Console.WriteLine(_transLookup["MANAGER_VERSION_CURRENT"].FormatExt($"[v{Program.Version.ToString()}]"));
                Console.ForegroundColor = ConsoleColor.Gray;
            }
#else
            else if (version.CurrentVersionPrerelease > Program.Version)
            {
                Console.ForegroundColor = ConsoleColor.DarkYellow;
                Console.WriteLine($"IW4MAdmin-Prerelease {_transLookup["MANAGER_VERSION_UPDATE"]} [v{version.CurrentVersionPrerelease.ToString()}-pr]");
                Console.WriteLine(_transLookup["MANAGER_VERSION_CURRENT"].FormatExt($"[v{Program.Version.ToString()}-pr]"));
                Console.ForegroundColor = ConsoleColor.Gray;
            }
#endif
            else
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.WriteLine(_transLookup["MANAGER_VERSION_SUCCESS"]);
                Console.ForegroundColor = ConsoleColor.Gray;
            }
        }

        public async Task RunUploadStatus(CancellationToken token)
        {
            // todo: clean up this logic
            bool connected;

            while (!token.IsCancellationRequested)
            {
                try
                {
                    await UploadStatus();
                }

                catch (System.Net.Http.HttpRequestException e)
                {
                    _logger.LogWarning(e, "Could not send heartbeat");
                }

                catch (AggregateException e)
                {
                    _logger.LogWarning(e, "Could not send heartbeat");
                    var exceptions = e.InnerExceptions.Where(ex => ex.GetType() == typeof(ApiException));

                    foreach (var ex in exceptions)
                    {
                        if (((ApiException)ex).StatusCode == System.Net.HttpStatusCode.Unauthorized)
                        {
                            connected = false;
                        }
                    }
                }

                catch (ApiException e)
                {
                    _logger.LogWarning(e, "Could not send heartbeat");
                    if (e.StatusCode == System.Net.HttpStatusCode.Unauthorized)
                    {
                        connected = false;
                    }
                }

                catch (Exception e)
                {
                    _logger.LogWarning(e, "Could not send heartbeat");
                }


                try
                {
                    await Task.Delay(30000, token);
                }

                catch
                {
                    break;
                }
            }
        }

        private async Task UploadStatus()
        {
            if (firstHeartBeat)
            {
                var token = await _apiInstance.Authenticate(new AuthenticationId
                {
                    Id = _appConfig.Id
                });

                _apiInstance.AuthorizationToken = $"Bearer {token.AccessToken}";
            }

            var instance = new ApiInstance
            {
                Id = _appConfig.Id,
                Uptime = (int)(DateTime.UtcNow - (_manager as ApplicationManager).StartTime).TotalSeconds,
                Version = Program.Version,
                Servers = _manager.GetServers().Select(s =>
                            new ApiServer()
                            {
                                ClientNum = s.ClientNum,
                                Game = s.GameName.ToString(),
                                Version = s.Version,
                                Gametype = s.Gametype,
                                Hostname = s.Hostname,
                                Map = s.CurrentMap.Name,
                                MaxClientNum = s.MaxClients,
                                Id = s.EndPoint,
                                Port = (short)s.Port,
                                IPAddress = s.IP
                            }).ToList(),
                WebfrontUrl = _appConfig.WebfrontUrl
            };

            Response<ResultMessage> response = null;

            if (firstHeartBeat)
            {
                response = await _apiInstance.AddInstance(instance);
            }

            else
            {
                response = await _apiInstance.UpdateInstance(instance.Id, instance);
                firstHeartBeat = false;
            }

            if (response.ResponseMessage.StatusCode != System.Net.HttpStatusCode.OK)
            {
                _logger.LogWarning("Non success response code from master is {statusCode}, message is {message}", response.ResponseMessage.StatusCode, response.StringContent);
            }
        }
    }
}