// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package io.flutter.app;

import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import io.flutter.app.FlutterActivityDelegate.ViewFactory;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.view.FlutterNativeView;
import io.flutter.view.FlutterView;

/**
 * Base class for activities that use Flutter who also require the use of the
 * Android v4 Support library's {@link FragmentActivity}. Applications that
 * don't have this need will likely want to use {@link FlutterActivity} instead.
 *
 * <p><strong>Important!</strong> Flutter does not bundle the necessary Android
 * v4 Support library classes for this class to work at runtime. It is the
 * responsibility of the app developer using this class to ensure that they
 * link against the v4 support library .jar file when creating their app to
 * ensure that {@link FragmentActivity} is available at runtime.</p>
 *
 * @see <a target="_new" href="https://developer.android.com/topic/libraries/support-library/setup.html">https://developer.android.com/topic/libraries/support-library/setup.html</a>
 */
public class FlutterFragmentActivity
        extends FragmentActivity implements FlutterView.Provider, PluginRegistry, ViewFactory {
    private final FlutterActivityDelegate delegate = new FlutterActivityDelegate(this, this);

    // These aliases ensure that the methods we forward to the delegate adhere
    // to relevant interfaces versus just existing in FlutterActivityDelegate.
    private final FlutterActivityEvents eventDelegate = delegate;
    private final FlutterView.Provider viewProvider = delegate;
    private final PluginRegistry pluginRegistry = delegate;

    /**
     * Returns the Flutter view used by this activity; will be null before
     * {@link #onCreate(Bundle)} is called.
     */
    @Override
    public FlutterView getFlutterView() {
        return viewProvider.getFlutterView();
    }

    /**
     * Hook for subclasses to customize the creation of the
     * {@code FlutterView}.
     *
     * <p>The default implementation returns {@code null}, which will cause the
     * activity to use a newly instantiated full-screen view.</p>
     */
    @Override
    public FlutterView createFlutterView(Context context) {
        return null;
    }

    @Override
    public FlutterNativeView createFlutterNativeView() {
        return null;
    }

    @Override
    public boolean retainFlutterNativeView() {
        return false;
    }

    @Override
    public final boolean hasPlugin(String key) {
        return pluginRegistry.hasPlugin(key);
    }

    @Override
    public final <T> T valuePublishedByPlugin(String pluginKey) {
        return pluginRegistry.valuePublishedByPlugin(pluginKey);
    }

    @Override
    public final Registrar registrarFor(String pluginKey) {
        return pluginRegistry.registrarFor(pluginKey);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        eventDelegate.onCreate(savedInstanceState);
    }

    @Override
    protected void onDestroy() {
        eventDelegate.onDestroy();
        super.onDestroy();
    }

    @Override
    public void onBackPressed() {
        if (!eventDelegate.onBackPressed()) {
            super.onBackPressed();
        }
    }
        
    @Override
    protected void onStart() {
        super.onStart();
        eventDelegate.onStart();
    }

    @Override
    protected void onStop() {
        eventDelegate.onStop();
        super.onStop();
    }

    @Override
    protected void onPause() {
        super.onPause();
        eventDelegate.onPause();
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();
        eventDelegate.onPostResume();
    }

    // @Override - added in API level 23
    public void onRequestPermissionsResult(
            int requestCode, String[] permissions, int[] grantResults) {
        eventDelegate.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (!eventDelegate.onActivityResult(requestCode, resultCode, data)) {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    protected void onNewIntent(Intent intent) {
        eventDelegate.onNewIntent(intent);
    }

    @Override
    public void onUserLeaveHint() {
        eventDelegate.onUserLeaveHint();
    }

    @Override
    public void onTrimMemory(int level) {
        eventDelegate.onTrimMemory(level);
    }

    @Override
    public void onLowMemory() {
        eventDelegate.onLowMemory();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        eventDelegate.onConfigurationChanged(newConfig);
    }
}