using EasyModbus;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MasterClient.Client
{
	class ModbusMaster : ICommClient
	{
		private ModbusClient client;

		public byte identifier = 1;

		public ModbusMaster(byte identifier = 1)
		{
			client = new ModbusClient();
			this.identifier = identifier;
		}

		public void Connect()
		{
			try
			{
				if (client.Connected)
					client.Disconnect();

				client.Connect();
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}

		public void Disconnect()
		{
			try
			{
				client.Disconnect();
			}
			 catch (Exception ex)
			{
				throw ex;
			}
		}

		public bool GetStatus()
		{
			if (client == null)
				return false;

			return client.Connected;
		}

		public string ReadValue(string name)
		{
			if (!client.Connected)
				throw new Exception("Disconnected status");

			try
			{
				int address;

				if (!int.TryParse(name, out address))
					throw new Exception("cannot parse as int");

				string value = "";
				if (address >= 40001 && address < 50000)
					value = client.ReadHoldingRegisters(address - 40001, 1)[0].ToString();
				else if (address >= 30001 && address < 40000)
					value = client.ReadInputRegisters(address - 30001, 1)[0].ToString();
				else if (address >= 10001 && address < 20000)
					value = client.ReadInputRegisters(address - 10001, 1)[0].ToString();
				else if (address >= 1 && address < 10000)
					value = client.ReadCoils(address - 1, 1)[0].ToString();
				else
					throw new Exception("Address is unavailable. (0x, 1x, 3x, 4x only)");

				return value;
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}

		public void SetServer(string ip, int port)
		{
			client.IPAddress = ip;
			client.Port = port;
			client.UnitIdentifier = this.identifier;
		}

		public void WriteValue(string name, string value)
		{
			if (!client.Connected)
				throw new Exception("Disconnected status");

			try
			{
				// 0x, 4x 만 쓰기 가능
				int address;

				if (!int.TryParse(name, out address))
					throw new Exception("Cannot parse as int");

				if (address >= 40001 && address < 50000)
				{
					int parsed = 0;
					if (!int.TryParse(value, out parsed))
						throw new Exception("Value is not integer");

					client.WriteSingleRegister(address - 40001, parsed);
				}
				else if (address >= 1 && address < 10000)
				{
					bool parsed = false;
					if (value == "0")
						parsed = false;
					else if (value == "1")
						parsed = true;
					else if (!bool.TryParse(value, out parsed))
						throw new Exception("Value is not boolean");

					client.WriteSingleCoil(address - 1, parsed);
				}
				else
					throw new Exception("Address is unavailable (0x, 4x only)");
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}
	}
}