using Modbus.Device;
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace MV485.helper
{
    public class ModbusRtuClient_A
    {
        private SerialPort _serialPort;
        private IModbusSerialMaster _modbusMaster;
        private readonly string _portName;
        private readonly int _baudRate;
        private readonly Parity _parity;
        private readonly int _dataBits;
        private readonly StopBits _stopBits;
        private readonly List<byte> _deviceAddresses;
        private readonly int _pollingIntervalMs;
        private CancellationTokenSource _cancellationTokenSource;

        public ModbusRtuClient_A(string portName, int baudRate, Parity parity, int dataBits, StopBits stopBits, List<byte> deviceAddresses, int pollingIntervalMs)
        {
            _portName = portName;
            _baudRate = baudRate;
            _parity = parity;
            _dataBits = dataBits;
            _stopBits = stopBits;
            _deviceAddresses = deviceAddresses;
            _pollingIntervalMs = pollingIntervalMs;
            Console.WriteLine("ModbusRtuClient initialized.");
        }

        public void Start()
        {
            Console.WriteLine("Starting Modbus RTU client...");
            _serialPort = new SerialPort(_portName, _baudRate, _parity, _dataBits, _stopBits);
            _serialPort.Open();
            Console.WriteLine("Serial port opened.");
            //_modbusMaster = new ModbusFactory().CreateRtuMaster(_serialPort);
            _modbusMaster = ModbusSerialMaster.CreateRtu(_serialPort);
            Console.WriteLine("Modbus master created.");
            _cancellationTokenSource = new CancellationTokenSource();
            Task.Run(() => PollingLoop(_cancellationTokenSource.Token));
        }

        public void Stop()
        {
            Console.WriteLine("Stopping Modbus RTU client...");
            _cancellationTokenSource?.Cancel();
            _modbusMaster?.Dispose();
            _serialPort?.Close();
            Console.WriteLine("Modbus RTU client stopped.");
        }

        private async Task PollingLoop(CancellationToken token)
        {
            Console.WriteLine("Starting polling loop...");
            while (!token.IsCancellationRequested)
            {
                foreach (var address in _deviceAddresses)
                {
                    try
                    {
                        Console.WriteLine($"Reading from device {address}...");
                        ushort[] registers = _modbusMaster.ReadHoldingRegisters(address, 0, 2);
                        Console.WriteLine($"Device {address}: Water Usage = {registers[0]}, Sampling Time = {registers[1]}");
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"Error reading device {address}: {ex.Message}");
                    }
                }
                Console.WriteLine("Polling cycle completed. Waiting for next cycle...");
                await Task.Delay(_pollingIntervalMs, token);
            }
            Console.WriteLine("Polling loop terminated.");
        }

        //-------------------------------------------------------------------------------------------------
    }
}