/*
 * Copyright (C) 2015 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.internal.policy;

import android.content.Context;
import android.content.res.AssetManager;
import android.content.res.Resources;
import android.view.ContextThemeWrapper;
import android.view.WindowManager;
import android.view.WindowManagerImpl;

import java.lang.ref.WeakReference;

Context for decor views which can be seeded with pure application context and not depend on the
activity, but still provide some of the facilities that Activity has,
e.g. themes, activity-based resources, etc.
@hide
/**
 * Context for decor views which can be seeded with pure application context and not depend on the
 * activity, but still provide some of the facilities that Activity has,
 * e.g. themes, activity-based resources, etc.
 *
 * @hide
 */
class DecorContext extends ContextThemeWrapper {
    private PhoneWindow mPhoneWindow;
    private WindowManager mWindowManager;
    private Resources mActivityResources;

    private WeakReference<Context> mActivityContext;

    public DecorContext(Context context, Context activityContext) {
        super(context, null);
        mActivityContext = new WeakReference<>(activityContext);
        mActivityResources = activityContext.getResources();
    }

    void setPhoneWindow(PhoneWindow phoneWindow) {
        mPhoneWindow = phoneWindow;
        mWindowManager = null;
    }

    @Override
    public Object getSystemService(String name) {
        if (Context.WINDOW_SERVICE.equals(name)) {
            if (mWindowManager == null) {
                WindowManagerImpl wm =
                        (WindowManagerImpl) super.getSystemService(Context.WINDOW_SERVICE);
                mWindowManager = wm.createLocalWindowManager(mPhoneWindow);
            }
            return mWindowManager;
        }
        return super.getSystemService(name);
    }

    @Override
    public Resources getResources() {
        Context activityContext = mActivityContext.get();
        // Attempt to update the local cached Resources from the activity context. If the activity
        // is no longer around, return the old cached values.
        if (activityContext != null) {
            mActivityResources = activityContext.getResources();
        }

        return mActivityResources;
    }

    @Override
    public AssetManager getAssets() {
        return mActivityResources.getAssets();
    }
}