import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
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 BluetoothUstawienia extends ActionBarActivity {

    private BluetoothAdapter mBluetoothAdapter;        // BT
    private BluetoothSocket mmSocket;                  // BT
    BluetoothDevice mmDevice;                  // BT
    OutputStream mmOutputStream;               // BT
    InputStream mmInputStream;                 // BT
    private static final UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //uuid dla wymiany danych

    Thread workerThread;
    byte[] readBuffer;
    int readBufferPosition;
    volatile boolean stopWorker;

    private static final String TAG = "BTustawienia";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bluetooth_ustawienia);
    }

    public void findBT(View view){          // View view bo bierze wartość z activity_main.xml

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        if(mBluetoothAdapter==null){                            // BT info
            Toast.makeText(getApplicationContext(), "Nie wykryto BT", Toast.LENGTH_LONG).show();
        }

        if(!mBluetoothAdapter.isEnabled()){                         // Pyta czy bluetooth jest włączony
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBluetooth,0);
        }

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
        if(pairedDevices.size() > 0)
        {
            for(BluetoothDevice device : pairedDevices)
            {
                if(device.getName().equals("PATRYK-KOMPUTER"))          // WPISZ TU SWOJA NAZWE URZADZENIA
                {
                    mmDevice = device;
                    break;
                }
            }
        }

        Toast.makeText(getApplicationContext(),"Znaleziono BT", Toast.LENGTH_LONG).show();

    }

    public void openBT(View view) throws IOException
    {
        if (mmDevice != null) {

            try {
                Toast.makeText(getApplicationContext(),"Próba łączenia", Toast.LENGTH_SHORT).show();
                mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
                mmSocket.connect();

                mmOutputStream = mmSocket.getOutputStream();
                mmInputStream = mmSocket.getInputStream();
                beginListenForData();

                Toast.makeText(getApplicationContext(),"Połączono!", Toast.LENGTH_LONG).show();
            } catch (Exception e2) {
                Toast.makeText(getApplicationContext(),"Nie połączono :(", Toast.LENGTH_LONG).show();
            }

            mmOutputStream = mmSocket.getOutputStream();
            mmInputStream = mmSocket.getInputStream();

            //beginListenForData();         // Do nasluchiwania bluetooth
            //sendData();                     // Do odbierania
        }
        else if (mmDevice == null){
            Toast.makeText(getApplicationContext(), "Nie ma sparowanych urządzeń", Toast.LENGTH_LONG).show();
        }


    }

    void beginListenForData()
    {
        final Handler handler = new Handler();
        final byte delimiter = 10; //This is the ASCII code for a newline character

        stopWorker = false;
        readBufferPosition = 0;
        readBuffer = new byte[1024];
        workerThread = new Thread(new Runnable()
        {
            public void run()
            {
                while(!Thread.currentThread().isInterrupted() && !stopWorker)
                {
                    try
                    {
                        int bytesAvailable = mmInputStream.available();
                        if(bytesAvailable > 0)
                        {
                            byte[] packetBytes = new byte[bytesAvailable];
                            mmInputStream.read(packetBytes);
                            for(int i=0;i<bytesAvailable;i++)
                            {
                                byte b = packetBytes[i];
                                if(b == delimiter)
                                {
                                    byte[] encodedBytes = new byte[readBufferPosition];
                                    System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                                    final String data = new String(encodedBytes, "US-ASCII");
                                    readBufferPosition = 0;

                                    handler.post(new Runnable()
                                    {
                                        public void run()
                                        {
                                            Log.v(TAG, "data = " + data);
                                        }
                                    });
                                }
                                else
                                {
                                    readBuffer[readBufferPosition++] = b;
                                }
                            }
                        }
                    }
                    catch (IOException ex)
                    {
                        stopWorker = true;
                    }
                }
            }
        });

        workerThread.start();
    }

    public void sendData() throws IOException
    {

        String msg = "wiadomosc";

        msg += "\r";
        mmOutputStream.write(msg.getBytes());
        Toast.makeText(getApplicationContext(),"Dane zostały przesłane", Toast.LENGTH_SHORT).show();

        Log.v(TAG, "wysylanie wiadomosci");

        //TextView textViewBT = (TextView) findViewById(R.id.BTzobacz);
        //textViewBT.setText();
    }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_bluetooth_ustawienia, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}