using System.IO.Abstractions;
using System.Net;
using System.Net.Sockets;
using Quadarax.Foundation.Core.Logging;
using Quadarax.Foundation.Core.Object;

namespace qmonlib
{
    public abstract class QMonHostBase<TConfiguration> : DisposableObject 
        where TConfiguration : QMonHostConfiguration
    {

        #region *** Fields ***
        private bool _isEnabled;
        private ILog? _log;

        private UdpClient? _udpClientGeneral;
        private UdpClient? _udpClientData;

        private Timer? _timerGeneral;
        private Timer? _timerData;

        #endregion

        #region *** Properties ***
        protected TConfiguration Configuration { get; }
        protected abstract Uri UriGeneral { get; }
        protected abstract Uri UriData { get; }
        protected abstract TimeSpan IntervalGeneral {get; }
        protected abstract TimeSpan? IntervalData { get; }

        protected UdpClient UdpClientGeneral => _udpClientGeneral ?? throw new InvalidOperationException("UDP client channel General not open.");
        protected UdpClient UdpClientData => _udpClientData ?? throw new InvalidOperationException("UDP client channel Data not open.");
        public bool IsEnabled
        {
            get => _isEnabled;
            set => SetEnabled(value);
        }
        protected Quadarax.Foundation.Core.Json.Binder Binder { get; } = new Quadarax.Foundation.Core.Json.Binder(new FileSystem(),false,true,100);

        #endregion

        #region *** Constructors ***

        protected QMonHostBase(TConfiguration configuration, ILogger? externalLogger)
        {
            Configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
            _log = externalLogger?.GetLogger(GetType());
            SetEnabled(configuration.Enabled);
        }
        #endregion

        #region *** Private Operations ***
        protected void Open()
        {
            if (!_isEnabled) return;

            if (_udpClientGeneral != null) throw new InvalidOperationException("UDP client channel General already open. Close first.");
            if (_udpClientData != null) throw new InvalidOperationException("UDP client channel Data already open. Close first.");

            _udpClientGeneral = CreateUdpClient(UriGeneral);
            _udpClientData = CreateUdpClient(UriData);

            _timerGeneral = new Timer(OnTimerGeneral, this, IntervalGeneral, IntervalGeneral);
            if (IntervalData.HasValue)
                _timerData = new Timer(OnTimerData, this, IntervalData.Value, IntervalData.Value);
            
            OnOpen();
        }
        protected void Close()
        {
            if (!_isEnabled) return;
         
            if (_udpClientGeneral != null)
            {
                _timerGeneral?.Dispose();
                _udpClientGeneral.Close();
                _udpClientGeneral.Dispose();
                _udpClientGeneral = null;
                _timerGeneral = null;
            }

            if (_udpClientData != null)
            {
                _timerData?.Dispose();
                _udpClientData.Close();
                _udpClientData.Dispose();
                _udpClientData = null;
                _timerData = null;
            }
            OnClose();
        }

        protected abstract void OnOpen();
        protected abstract void OnClose();
        protected abstract void OnTimerData(object? state);
        protected abstract void OnTimerGeneral(object? state);
        #endregion

        protected void SetEnabled(bool value)
        {  
            if (value == _isEnabled)
                return;
            _isEnabled = value;
            if (_isEnabled)
                Open();
            else
                Close();
        }
        protected override void OnDisposing()
        {
            Close();
        }
        protected void Log(LogSeverityEnum type, string message, Exception? e = null)
        {
            _log?.Log(type, message, e);
        }

        protected abstract UdpClient CreateUdpClient(Uri targetUri);
    }
}