using System;
using UnityEngine;
using System.Collections;
using System.IO.Ports;
using Random = System.Random;

public class Serial
{
    private static Serial instance;
    private int rnd = 0;

    private Serial()
    {
    }

    ~Serial()
    {
        serialPort.Close();
        serialPort.Dispose();
    }

    public static Serial Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new Serial();
            }

            return instance;
        }
    }

    public bool enabled = false;

    public SerialPort serialPort;

    public int[] values = new int[18];

    public static string ByteArrayToString(byte[] ba)
    {
        return BitConverter.ToString(ba).Replace("-", " ");
    }

    public void send(int start, int a, int b, int c)
    {
        if (serialPort == null)
        {
            serialPort = new SerialPort(@"\\.\" + "COM4", 250000);

            try
            {
                serialPort.Parity = Parity.Even;
                serialPort.StopBits = StopBits.One;
                serialPort.DataBits = 8;
                serialPort.Open();
                serialPort.DiscardOutBuffer();
                serialPort.DiscardInBuffer();
                System.Threading.Thread.Sleep(1000);

                enabled = true;
            }
            catch
            {
                enabled = false;
            }
        }

        if (enabled)
        {
            values[start] = a;
            values[++start] = b;
            values[++start] = c;

            if (serialPort is SerialPort && start == 17)
            {
                // string send = "s";
                byte[] send = new byte[18+1+2];
                send[18] = 0x00;
                send[19] = 0xfe;
                send[20] = 0xff;
               // send[21] = 0xff;

                //                if (rnd == 0)
                //                {
                //rnd = 1;
                for (int i = 0; i < 18; i++)
                    {
                    //string crc = ((i) * (values[i])) + "";
                    //send = send + (i).ToString() + "_" + (values[i]).ToString() + "," + crc + "=";
                    byte[] intBytes = BitConverter.GetBytes(values[i]);
                    if (BitConverter.IsLittleEndian)
                        Array.Reverse(intBytes);
                    send[i] = intBytes[3];
                    send[18] += send[i];
                }

                   // Debug.Log(ByteArrayToString(send));
                    serialPort.Write(send, 0, 18+1+2);
                    serialPort.BaseStream.Flush();
//                }
//                else
//                {
//                    rnd = 0;
//                    for (int i = 10; i < 18; i++)
//                    {
//                        string crc = ((i + 3) * (values[i])) + "";
//
//                        send = send + (i + 2).ToString() + "_" + (values[i]).ToString() + "," + crc + "=";
//                    }
//
//                    Debug.Log(send);
//                    serialPort.Write(send);
//                }
            }
        }
    }
}