content: /*
   * Copyright (C) 2014 AChep@xda <artemchep@gmail.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   * MA  02110-1301, USA.
   */
  package com.achep.acdisplay.services;
  
  import android.content.BroadcastReceiver;
  import android.content.Context;
  import android.content.Intent;
  import android.content.IntentFilter;
  import android.hardware.Sensor;
  import android.hardware.SensorEvent;
  import android.hardware.SensorEventListener;
  import android.hardware.SensorManager;
  import android.os.Handler;
  import android.os.SystemClock;
  import androidx.annotation.NonNull;
  import android.util.Log;
  
  import com.achep.acdisplay.Config;
  import com.achep.acdisplay.R;
  import com.achep.base.AppHeap;
  import com.achep.base.utils.FileUtils;
  import com.achep.base.utils.power.PowerUtils;
  
  import java.io.File;
  import java.util.LinkedList;
  
  import static com.achep.base.Build.DEBUG;
  
  /**
   * Created by achep on 24.08.14.
   */
  public class SensorsDumpService extends BathService.ChildService implements
          SensorEventListener {
  
      private static final String TAG = "SensorsDumpService";
  
      private static final char DIVIDER = ';';
      private static final char NEW_LINE = '\n';
  
      private static final int MAX_SIZE = 2500;
  
      private SensorManager mSensorManager;
      private final int[] mSensorTypes = new int[]{
              Sensor.TYPE_GYROSCOPE, Sensor.TYPE_ACCELEROMETER,
      };
  
      private final LinkedList<Event> mEventList = new LinkedList<>();
  
      private static class Event {
          long timestamp;
          float[] values;
          int sensor;
      }
  
      private Handler mHandler = new Handler();
      private Receiver mReceiver = new Receiver();
  
      private class Receiver extends BroadcastReceiver {
  
          @Override
          public void onReceive(Context context, Intent intent) {
              switch (intent.getAction()) {
                  case Intent.ACTION_SCREEN_ON:
                      startListening();
  
                      // Stop listening after some minutes to keep battery.
                      mHandler.postDelayed(new Runnable() {
                          @Override
                          public void run() {
                              synchronized (mEventList) {
                                  stopListening();
                                  mEventList.clear();
                              }
                          }
                      }, 120 * 1000);
                      break;
                  case Intent.ACTION_SCREEN_OFF:
                      stopListening();
                      dropToStorage();
                      break;
              }
          }
      }
  
      /**
       * Starts or stops this service as required by settings and device's state.
       */
      public static void handleState(@NonNull Context context) {
          Config config = Config.getInstance();
  
          boolean onlyWhileChangingOption = !config.isEnabledOnlyWhileCharging()
                  || PowerUtils.isPlugged(context);
  
          if (config.isEnabled()
                  && config.isDevSensorsDumpEnabled()
                  && onlyWhileChangingOption) {
              BathService.startService(context, SensorsDumpService.class);
          } else {
              BathService.stopService(context, SensorsDumpService.class);
          }
      }
  
      @Override
      public void onCreate() {
          Context context = getContext();
          IntentFilter intentFilter = new IntentFilter();
          intentFilter.addAction(Intent.ACTION_SCREEN_ON);
          intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
          intentFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY - 1);
          context.registerReceiver(mReceiver, intentFilter);
  
          mSensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
      }
  
      @Override
      public void onDestroy() {
          getContext().unregisterReceiver(mReceiver);
          stopListening();
  
          // Watch for the leaks
          AppHeap.getRefWatcher().watch(this);
      }
  
      @Override
      public String getLabel() {
          return getContext().getString(R.string.service_bath_active_mode_dump);
      }
  
      private void startListening() {
          for (int type : mSensorTypes) {
              Sensor sensor = mSensorManager.getDefaultSensor(type);
              if (sensor != null) {
                  if (DEBUG) Log.d(TAG, "Listening to " + sensor.getName() + " sensor...");
                  mSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);
              }
          }
      }
  
      private void stopListening() {
          if (DEBUG) Log.d(TAG, "Stopping listening...");
          mSensorManager.unregisterListener(this);
          mHandler.removeCallbacksAndMessages(null);
      }
  
      private void dropToStorage() {
          synchronized (mEventList) {
              if (DEBUG) Log.d(TAG, "Dumping sensors data to file...");
              if (mEventList.size() == 0) {
                  return;
              }
  
              StringBuilder sb = new StringBuilder();
              for (Event event : mEventList) {
                  sb.append(event.timestamp).append(DIVIDER);
                  sb.append(event.sensor).append(DIVIDER);
                  for (float f : event.values) sb.append(f).append(DIVIDER);
                  sb.append(NEW_LINE);
              }
  
              String filename = "dump_sensors_" + SystemClock.elapsedRealtime() + ".txt";
              File file = new File(getContext().getFilesDir(), filename);
              FileUtils.writeToFile(file, sb);
  
              mEventList.clear();
          }
      }
  
      @Override
      public void onSensorChanged(SensorEvent sensorEvent) {
          synchronized (mEventList) {
              Event event = new Event();
              event.timestamp = SystemClock.elapsedRealtime();
              event.values = sensorEvent.values.clone();
              event.sensor = sensorEvent.sensor.getType();
              mEventList.add(event);
  
              int size = mEventList.size();
              if (size > MAX_SIZE) {
                  mEventList.remove(0);
              }
          }
      }
  
      @Override
      public void onAccuracyChanged(Sensor sensor, int i) { /* unused */ }
  
  }
  