namespace devMobile.IoT.LoRaWAN.nanoFramework.RAK4200
{
	using System;
	using System.Diagnostics;
	using System.IO.Ports;
	using System.Threading;
   using global::nanoFramework.Hardware.Esp32; //need NuGet nanoFramework.Hardware.Esp32

   public class Program
	{
		private static SerialPort _SerialPort;
        private const string SerialPortId = "COM2";

        public static void Main()
		{
			Thread.Sleep(5000);

#if SERIAL_THREADED_READ
			Thread readThread = new Thread(SerialPortProcessor);
#endif

			Debug.WriteLine("devMobile.IoT.LoRaWAN.nanoFramework.RAK4200 BreakoutSerial starting");

			try
			{
            // set GPIO functions for COM2 (this is UART1 on ESP32)
            Configuration.SetPinFunction(Gpio.IO21, DeviceFunction.COM2_TX);
			Configuration.SetPinFunction(Gpio.IO19, DeviceFunction.COM2_RX);

            Debug.Write("Ports:");
				foreach (string port in SerialPort.GetPortNames())
				{
					Debug.Write($" {port}");
				}
				Debug.WriteLine("");

				using (_SerialPort = new SerialPort(SerialPortId))
				{
					// set parameters
					//_SerialPort.BaudRate = 9600;
					_SerialPort.BaudRate = 115200;
					_SerialPort.Parity = Parity.None;
					_SerialPort.DataBits = 8;
					_SerialPort.StopBits = StopBits.One;
					_SerialPort.Handshake = Handshake.None;
					_SerialPort.NewLine = "\r\n";

					//_SerialPort.ReadBufferSize = 128; 
					//_SerialPort.ReadBufferSize = 256; 
					_SerialPort.ReadBufferSize = 512; 
					//_SerialPort.ReadBufferSize = 1024;
					_SerialPort.ReadTimeout = 1000;

					//_SerialPort.WatchChar = '\n'; // May 2022 WatchChar event didn't fire github issue https://github.com/nanoframework/Home/issues/1035

					_SerialPort.DataReceived += SerialDevice_DataReceived;

					_SerialPort.Open();

					_SerialPort.WatchChar = '\n';

					for (int i = 0; i < 5; i++)
					{
						string atCommand;
						atCommand = "at+version";
						//atCommand = "at+set_config=device:uart:1:9600";
						//atCommand = "at+get_config=lora:status";
						//atCommand = "at+get_config=device:status";
						//atCommand = "at+get_config=lora:channel";
						//atCommand = "at+help";
						//atCommand = "at+set_config=device:restart";
						//atCommand = "at+set_config=lora:default_parameters";
						//atCommand = "at+set_config=lora:work_mode:0";
						Debug.WriteLine("");
						Debug.WriteLine($"{i} TX:{atCommand} bytes:{atCommand.Length}--------------------------------");
						_SerialPort.WriteLine(atCommand);

						Thread.Sleep(5000);
					}
				}
				Debug.WriteLine("Done");
			}
			catch (Exception ex)
			{
				Debug.WriteLine(ex.Message);
			}
		}

		private static void SerialDevice_DataReceived(object sender, SerialDataReceivedEventArgs e)
		{
			SerialPort serialPort = (SerialPort)sender;

			switch (e.EventType)
			{
				case SerialData.Chars:
					break;

				case SerialData.WatchChar:
					string response = serialPort.ReadExisting();
					Debug.Write(response);
					break;
				default:
					Debug.Assert(false, $"e.EventType {e.EventType} unknown");
					break;
			}
		}
	}
}