/*
 * Copyright (C) 2022 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.systemui.accessibility.floatingmenu;

import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_EXCLUDE_FROM_SCREEN_MAGNIFICATION;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_UNRESTRICTED_GESTURE_EXCLUSION;
import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_SHOW_FOR_ALL_USERS;

import android.content.Context;
import android.graphics.PixelFormat;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityManager;

import com.android.settingslib.bluetooth.HearingAidDeviceManager;
import com.android.systemui.navigationbar.NavigationModeController;
import com.android.systemui.util.settings.SecureSettings;

/**
 * Controls the {@link MenuViewLayer} whether to be attached to the window via the interface
 * of {@link IAccessibilityFloatingMenu}.
 */
class MenuViewLayerController implements IAccessibilityFloatingMenu {
    private final WindowManager mWindowManager;
    private final MenuViewLayer mMenuViewLayer;
    private boolean mIsShowing;

    MenuViewLayerController(Context context, WindowManager windowManager,
            AccessibilityManager accessibilityManager, SecureSettings secureSettings,
            NavigationModeController navigationModeController,
            HearingAidDeviceManager hearingAidDeviceManager) {
        mWindowManager = windowManager;

        MenuViewModel menuViewModel = new MenuViewModel(
                context, accessibilityManager, secureSettings, hearingAidDeviceManager);
        MenuViewAppearance menuViewAppearance = new MenuViewAppearance(context, windowManager);

        mMenuViewLayer = new MenuViewLayer(context, windowManager, accessibilityManager,
                menuViewModel,
                menuViewAppearance,
                new MenuView(context, menuViewModel, menuViewAppearance, secureSettings),
                this,
                secureSettings,
                navigationModeController);
    }

    @Override
    public boolean isShowing() {
        return mIsShowing;
    }

    @Override
    public void show() {
        if (isShowing()) {
            return;
        }

        mIsShowing = true;
        mWindowManager.addView(mMenuViewLayer, createDefaultLayerLayoutParams());
    }

    @Override
    public void hide() {
        if (!isShowing()) {
            return;
        }

        mIsShowing = false;
        mWindowManager.removeView(mMenuViewLayer);
    }

    private static WindowManager.LayoutParams createDefaultLayerLayoutParams() {
        final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        params.setTitle("FloatingMenu");
        params.receiveInsetsIgnoringZOrder = true;
        params.privateFlags |=
                PRIVATE_FLAG_EXCLUDE_FROM_SCREEN_MAGNIFICATION | SYSTEM_FLAG_SHOW_FOR_ALL_USERS
                        | PRIVATE_FLAG_UNRESTRICTED_GESTURE_EXCLUSION;
        params.windowAnimations = android.R.style.Animation_Translucent;
        // Insets are configured to allow the menu to display over navigation and system bars.
        params.setFitInsetsTypes(0);
        params.layoutInDisplayCutoutMode =
                WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
        return params;
    }
}