// Obtenido del video Youtube https://www.youtube.com/watch?v=mJtFvprSbzk

package com.example.arduino_led_bluetooth;

import androidx.appcompat.app.AppCompatActivity;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

public class MainActivity extends AppCompatActivity {
    private BluetoothAdapter btAdapter = null;
    private BluetoothSocket btSocket = null;
    public static String address = null;
    private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    public boolean activar;
    Handler bluetoothIn;
    final int handlerState = 0;
    Button prender,button,apagar,desconectar;
    private ConnectedThread MyConexionBT;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        prender = findViewById(R.id.prender);
        button = findViewById(R.id.button);
        apagar = findViewById(R.id.Apagar);
        desconectar = findViewById(R.id.Desconectar);


      btAdapter = BluetoothAdapter.getDefaultAdapter();
      verificarBluetooth();

      Set<BluetoothDevice> pairedDeveicesList = btAdapter.getBondedDevices();

      for(BluetoothDevice pairedDevice : pairedDeveicesList){
          if(pairedDevice.getName().equals("HC-05")){

              address = pairedDevice.getAddress();
          }


      }


      button.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              activar = true;
              onResume();
          }
      });

        prender.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               MyConexionBT.write("1");
            }
        });
        apagar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MyConexionBT.write("0");
            }
        });

        desconectar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{

                    btSocket.close();
                } catch(Exception e){
                    e.printStackTrace();
                }
            }
        });





    }

    private BluetoothSocket createBluetoothSocket (BluetoothDevice device) throws IOException{

        return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
    }




    private void verificarBluetooth(){
        if(btAdapter.isEnabled()){


        }else{

            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(intent,1);
        }

    }
    public void onResume() {
        super.onResume();


        if (activar) {
            BluetoothDevice device = btAdapter.getRemoteDevice(address);

            try {
                btSocket = createBluetoothSocket(device);

            } catch (IOException e) {
                Toast.makeText(getBaseContext(), "La creacción del Socket fallo", Toast.LENGTH_LONG).show();
            }
            // Establece la conexión con el socket Bluetooth.
            try {
                btSocket.connect();
            } catch (IOException e) {
                try {
                    btSocket.close();
                } catch (IOException e2) {

                }
            }
            MyConexionBT = new ConnectedThread(btSocket);
            MyConexionBT.start();
        }

    }

    private class ConnectedThread extends Thread {
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {

            InputStream tmpIn = null;
            OutputStream tmpOut = null;
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {

            }
            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            byte[] buffer = new byte[256];
            int bytes;

            // Se mantiene en modo escucha para determinar el ingreso de datos
            while (true) {
                try {

                    bytes = mmInStream.read(buffer);
                    String readMessage = new String(buffer, 0, bytes);
                    // Envia los datos obtenidos hacia el evento via handler
                    bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
                } catch (IOException e) {
                    break;
                }
            }
        }

        //Envio de trama
        public void write(String input) {
            try {
                mmOutStream.write(input.getBytes());
            } catch (IOException e) {
                //si no es posible enviar datos se cierra la conexión
                Toast.makeText(getBaseContext(), "La Conexión fallo", Toast.LENGTH_LONG).show();
                finish();
            }
        }



    }

}