using NLog;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using System.Threading;

namespace ESPServer
{
	class UnitDataWriter
	{
		const int UNIT_TARGET_PORT = 7000;

		private readonly Logger logger = LogManager.GetCurrentClassLogger();

		UnitsDatabase db;

		public UnitDataWriter(UnitsDatabase db, RegistersContainer registers)
		{
			this.db = db;
			registers.OnRegisterWritten += OnRegisterWritten;
		}

		private void OnRegisterWritten(int address, float value)
		{
			logger.Debug("Register written, address = " + address.ToString() + " value = " + value.ToString());
			var unit = db.GetUnit(address);
			if (unit == null)
			{
				return;
			}
			var payload = unit.GetWriteCommand(address, value);
			if (payload == null)
			{
				logger.Info("Write of address " + address + " is not supported by unit " + unit.id);
				return;
			}
			try
			{
				using (var udpClient = new UdpClient())
				{
					udpClient.Connect(unit.ip, UNIT_TARGET_PORT);
					udpClient.Send(payload, payload.Length);
					udpClient.Close();
				}
			}
			catch (Exception e)
			{
				logger.Error(e.Message);
			}
		}
	}
}