/*
 * Copyright (C) 2020 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.car.notification.headsup;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.PixelFormat;
import android.view.Gravity;
import android.view.WindowManager;

import com.android.car.notification.R;

/**
 * A concrete implementation of {@link CarHeadsUpNotificationContainer} used by the standalone
 * CarNotification application. It extends the base class to provide a specific implementation
 * for displaying HUNs within the context of a standalone app.
 */
public class CarHeadsUpNotificationAppContainer extends CarHeadsUpNotificationContainer {

    public CarHeadsUpNotificationAppContainer(Context context) {
        super(context);
        attachToWindow();
    }

    /**
     * Attaches the Heads-Up Notification (HUN) view to the window. Implementations should handle
     * adding the view returned by {@link #getHunRootView()} to the {@link WindowManager}.
     */
    private void attachToWindow() {
        WindowManager wm = getContext().getSystemService(WindowManager.class);
        wm.addView(getHunRootView(), getWindowManagerLayoutParams());
    }

    /**
     * Returns the {@link WindowManager.LayoutParams} to be used when adding the HUN Window to the
     * {@link WindowManager}.
     *
     * @return {@link WindowManager.LayoutParams} for the HUN container.
     */
    private WindowManager.LayoutParams getWindowManagerLayoutParams() {
        Resources resources = getContext().getResources();
        WindowManager.LayoutParams wrapperParams = new WindowManager.LayoutParams(
                resources.getDimensionPixelSize(R.dimen.headsup_container_width),
                resources.getDimensionPixelSize(R.dimen.headsup_container_height),
                // This type allows covering status bar and receiving touch input
                WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        wrapperParams.gravity = getShowHunOnBottom() ? Gravity.BOTTOM : Gravity.TOP;
        wrapperParams.y = resources.getDimensionPixelSize(
                R.dimen.headsup_notification_window_y_offset);
        return wrapperParams;
    }
}