/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.dialer.binary.common;

import android.app.Application;
import android.os.StrictMode;
import android.os.Trace;
import android.support.annotation.NonNull;
import com.android.dialer.blocking.BlockedNumbersAutoMigrator;
import com.android.dialer.blocking.FilteredNumberAsyncQueryHandler;
import com.android.dialer.buildtype.BuildType;
import com.android.dialer.common.concurrent.DefaultDialerExecutorFactory;
import com.android.dialer.inject.HasRootComponent;
import com.android.dialer.persistentlog.PersistentLogger;

/** A common application subclass for all Dialer build variants. */
public abstract class DialerApplication extends Application implements HasRootComponent {

  private volatile Object rootComponent;

  @Override
  public void onCreate() {
    Trace.beginSection("DialerApplication.onCreate");
    if (BuildType.get() == BuildType.BUGFOOD) {
      enableStrictMode();
    }
    super.onCreate();
    new BlockedNumbersAutoMigrator(
            this.getApplicationContext(),
            new FilteredNumberAsyncQueryHandler(this),
            new DefaultDialerExecutorFactory())
        .asyncAutoMigrate();
    PersistentLogger.initialize(this);
    Trace.endSection();
  }

  private void enableStrictMode() {
    StrictMode.setThreadPolicy(
        new StrictMode.ThreadPolicy.Builder().detectAll().penaltyDeath().build());
    StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll().penaltyDeath().build());
  }

  /**
   * Returns a new instance of the root component for the application. Sub classes should define a
   * root component that extends all the sub components "HasComponent" intefaces. The component
   * should specify all modules that the application supports and provide stubs for the remainder.
   */
  @NonNull
  protected abstract Object buildRootComponent();

  /** Returns a cached instance of application's root component. */
  @Override
  @NonNull
  public final Object component() {
    Object result = rootComponent;
    if (result == null) {
      synchronized (this) {
        result = rootComponent;
        if (result == null) {
          rootComponent = result = buildRootComponent();
        }
      }
    }
    return result;
  }
}