import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;


import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
  private static final String TAG = "bluetooth2";

  Button btnOn, btnOff;
  TextView txtArduino, txtTemperature;
  Handler h;


  final int RECIEVE_MESSAGE = 1;
  private BluetoothAdapter btAdapter = null;
  private BluetoothSocket btSocket = null;
  private StringBuilder sb = new StringBuilder();

  private ConnectedThread mConnectedThread;

  // SPP UUID service
  private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

  // MAC-address of Bluetooth module (you must edit this line)
  private static String address = "20:13:05:07:02:07";


  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    btnOn = (Button) findViewById(R.id.button2);                  // button LED ON
    btnOff = (Button) findViewById(R.id.button3);                // button LED OFF
    txtArduino = (TextView) findViewById(R.id.textView2);
    txtTemperature = (TextView) findViewById(R.id.textView3);

    h = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case RECIEVE_MESSAGE:                                                   // if receive massage
                byte[] readBuf = (byte[]) msg.obj;
                String strIncom = new String(readBuf, 0, msg.arg1);                 // create string from bytes array
                sb.append(strIncom);                                                // append string
                int endOfLineIndex = sb.indexOf("\r\n");                            // determine the end-of-line
                if (endOfLineIndex > 0) {                                            // if end-of-line,
                    String sbprint = sb.substring(0, endOfLineIndex);               // extract string
                    sb.delete(0, sb.length());                                      // and clear
                    if (sbprint.toCharArray()[0] == '*')
                    {
                        txtTemperature.setText("Teplota z čidla DHT11 je " +  sbprint.substring(1, sbprint.length()                                                                                                                                                                                                                                                                               ) + "°C");
                    }
                    else
                    {
                        txtArduino.setText(sbprint + "\n" +  txtArduino.getText());            // update TextView
                    }
                }

                break;
            }
        };
    };

    btAdapter = BluetoothAdapter.getDefaultAdapter();



    checkBTState();


    // tlačítko ON
    btnOn.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {

        mConnectedThread.write("1");    // Send "1" via Bluetooth
        //Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
      }
    });

    btnOff.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {

        mConnectedThread.write("0");    // Send "0" via Bluetooth
        //Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
      }
    });
  }

  private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
      if(Build.VERSION.SDK_INT >= 10){
          try {
              final Method  m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
              return (BluetoothSocket) m.invoke(device, MY_UUID);
          } catch (Exception e) {
              Log.e(TAG, "Could not create Insecure RFComm Connection",e);
          }
      }
      return  device.createRfcommSocketToServiceRecord(MY_UUID);
  }

  @Override
  public void onResume() {
    super.onResume();
    BluetoothDevice device = btAdapter.getRemoteDevice(address);

    try {
        btSocket = createBluetoothSocket(device);
    } catch (IOException e) {
        errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
    }

    // Discovery is resource intensive.  Make sure it isn't going on
    // when you attempt to connect and pass your message.
    btAdapter.cancelDiscovery();

    // Establish the connection.  This will block until it connects.
    Log.d(TAG, "...Connecting...");
    try {
      btSocket.connect();
      Log.d(TAG, "....Connection ok...");
    } catch (IOException e) {
      try {
        btSocket.close();
      } catch (IOException e2) {
        errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
      }
    }

    // Create a data stream so we can talk to server.
    Log.d(TAG, "...Create Socket...");


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

  @Override
  public void onPause() {
    super.onPause();

    Log.d(TAG, "...In onPause()...");

    try     {
      btSocket.close();
    } catch (IOException e2) {
      errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
    }
  }

  private void checkBTState() {
    if(btAdapter==null) {
      Log.d(TAG, "Zařízení nepodporuje Bluetooth");

    } else {
      if (btAdapter.isEnabled()) {
        Log.d(TAG, "...Bluetooth ON...");
        } else {
        //Prompt user to turn on Bluetooth
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, 1);

      }
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 // TODO Auto-generated method stub
 if(requestCode == 884){
 if (resultCode == RESULT_OK){
 Toast.makeText(getApplicationContext(), "BlueTooth is now Enabled", Toast.LENGTH_LONG).show();
 Log.d(TAG, "Zapnuté bluetooth...");
 }
  if(resultCode == RESULT_CANCELED){
 Toast.makeText(getApplicationContext(), "Error occured while enabling.Leaving the application..", Toast.LENGTH_LONG).show();
 Log.d(TAG, "Vypnuté bluetooth...");
  ///finish();
  }
  }
  }//onActivityResult

  private void errorExit(String title, String message){
    Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
    finish();
  }

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

        public ConnectedThread(BluetoothSocket socket) {
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the input and output streams, using temp objects because
            // member streams are final
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) { }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            byte[] buffer = new byte[256];  // buffer store for the stream
            int bytes; // bytes returned from read()

            // Keep listening to the InputStream until an exception occurs
            while (true) {
                try {
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);        // Get number of bytes and message in "buffer"
                    h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();     // Send to message queue Handler
                } catch (IOException e) {
                    break;
                }
            }
        }

        /* Call this from the main activity to send data to the remote device */
        public void write(String message) {
            Log.d(TAG, "...Data to send: " + message + "...");
            byte[] msgBuffer = message.getBytes();
            try {
                mmOutStream.write(msgBuffer);
            } catch (IOException e) {
                Log.d(TAG, "...Error data send: " + e.getMessage() + "...");
              }
        }
    }
}