using System;
using System.ServiceProcess;
using System.Threading;
using System.Threading.Tasks;
using System.Diagnostics;

namespace NoticeServer
{
    public partial class NoticeService : ServiceBase
    {
        private CancellationTokenSource _cancellationTokenSource;
        private Task _serviceTask;
        private static TcpChatServer _tcpServer;

        public NoticeService()
        {
            InitializeComponent();
            ServiceName = "EETGWNoticeService";
            CanStop = true;
            CanPauseAndContinue = false;
            AutoLog = true;
        }

        protected override void OnStart(string[] args)
        {
            try
            {
                EventLog.WriteEntry(ServiceName, "Notice 서비스가 시작됩니다.", EventLogEntryType.Information);

                _cancellationTokenSource = new CancellationTokenSource();
                _serviceTask = Task.Run(() => DoWork(_cancellationTokenSource.Token));

                EventLog.WriteEntry(ServiceName, "Notice 서비스가 성공적으로 시작되었습니다.", EventLogEntryType.Information);
            }
            catch (Exception ex)
            {
                EventLog.WriteEntry(ServiceName, $"서비스 시작 중 오류 발생: {ex.Message}", EventLogEntryType.Error);
                throw;
            }
        }

        protected override void OnStop()
        {
            try
            {
                EventLog.WriteEntry(ServiceName, "Notice 서비스를 중지합니다.", EventLogEntryType.Information);

                _cancellationTokenSource?.Cancel();

                // Stop server
                _tcpServer?.Stop();

                if (_serviceTask != null)
                {
                    // 최대 30초 대기
                    if (!_serviceTask.Wait(TimeSpan.FromSeconds(30)))
                    {
                        EventLog.WriteEntry(ServiceName, "서비스 중지 시간 초과", EventLogEntryType.Warning);
                    }
                }

                EventLog.WriteEntry(ServiceName, "Notice 서비스가 중지되었습니다.", EventLogEntryType.Information);
            }
            catch (Exception ex)
            {
                EventLog.WriteEntry(ServiceName, $"서비스 중지 중 오류 발생: {ex.Message}", EventLogEntryType.Error);
            }
            finally
            {
                _cancellationTokenSource?.Dispose();
                _serviceTask?.Dispose();
            }
        }

        private void DoWork(CancellationToken cancellationToken)
        {
            EventLog.WriteEntry(ServiceName, "Notice 서비스 작업을 시작합니다.", EventLogEntryType.Information);

            try
            {
                // Read settings
                int tcpPort = Properties.Settings.Default.TcpPort;
                int maxClients = Properties.Settings.Default.MaxClients;

                // Start server
                _tcpServer = new TcpChatServer(tcpPort, maxClients);
                _tcpServer.Start();

                EventLog.WriteEntry(ServiceName, $"Notice 서버가 포트 {tcpPort}에서 시작되었습니다.", EventLogEntryType.Information);

                // Wait for cancellation
                while (!cancellationToken.IsCancellationRequested)
                {
                    if (cancellationToken.WaitHandle.WaitOne(1000))
                    {
                        break; // 취소 요청 시 종료
                    }
                }
            }
            catch (Exception ex)
            {
                EventLog.WriteEntry(ServiceName, $"서버 실행 중 오류 발생: {ex.Message}\n{ex.StackTrace}", EventLogEntryType.Error);
            }

            EventLog.WriteEntry(ServiceName, "Notice 서비스 작업이 종료되었습니다.", EventLogEntryType.Information);
        }

        private void InitializeComponent()
        {
            //
            // NoticeService
            //
            this.ServiceName = "EETGWNoticeService";
        }
    }
}