/*
 * Copyright (C) 2021 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.launcher3.taskbar;

import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;

import static com.android.systemui.shared.system.WindowManagerWrapper.ITYPE_BOTTOM_TAPPABLE_ELEMENT;
import static com.android.systemui.shared.system.WindowManagerWrapper.ITYPE_EXTRA_NAVIGATION_BAR;

import android.graphics.PixelFormat;
import android.graphics.Point;
import android.view.Gravity;
import android.view.WindowManager;

import com.android.launcher3.BaseQuickstepLauncher;
import com.android.launcher3.R;
import com.android.systemui.shared.system.WindowManagerWrapper;

/**
 * Interfaces with Launcher/WindowManager/SystemUI to determine what to show in TaskbarView.
 */
public class TaskbarController {

    private static final String WINDOW_TITLE = "Taskbar";

    private final TaskbarContainerView mTaskbarContainerView;
    private final TaskbarView mTaskbarView;
    private final BaseQuickstepLauncher mLauncher;
    private final WindowManager mWindowManager;
    // Layout width and height of the Taskbar in the default state.
    private final Point mTaskbarSize;

    private WindowManager.LayoutParams mWindowLayoutParams;

    public TaskbarController(BaseQuickstepLauncher launcher,
            TaskbarContainerView taskbarContainerView) {
        mLauncher = launcher;
        mTaskbarContainerView = taskbarContainerView;
        mTaskbarView = mTaskbarContainerView.findViewById(R.id.taskbar_view);
        mWindowManager = mLauncher.getWindowManager();
        mTaskbarSize = new Point(MATCH_PARENT,
                mLauncher.getResources().getDimensionPixelSize(R.dimen.taskbar_size));
    }

    /**
     * Initializes the Taskbar, including adding it to the screen.
     */
    public void init() {
        addToWindowManager();
    }

    /**
     * Removes the Taskbar from the screen, and removes any obsolete listeners etc.
     */
    public void cleanup() {
        removeFromWindowManager();
    }

    private void removeFromWindowManager() {
        if (mTaskbarContainerView.isAttachedToWindow()) {
            mWindowManager.removeViewImmediate(mTaskbarContainerView);
        }
    }

    private void addToWindowManager() {
        removeFromWindowManager();

        final int gravity = Gravity.BOTTOM;

        mWindowLayoutParams = new WindowManager.LayoutParams(
                mTaskbarSize.x,
                mTaskbarSize.y,
                TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        mWindowLayoutParams.setTitle(WINDOW_TITLE);
        mWindowLayoutParams.packageName = mLauncher.getPackageName();
        mWindowLayoutParams.gravity = gravity;
        mWindowLayoutParams.setFitInsetsTypes(0);
        mWindowLayoutParams.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING;
        mWindowLayoutParams.layoutInDisplayCutoutMode = LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;

        WindowManagerWrapper wmWrapper = WindowManagerWrapper.getInstance();
        wmWrapper.setProvidesInsetsTypes(
                mWindowLayoutParams,
                new int[] { ITYPE_EXTRA_NAVIGATION_BAR, ITYPE_BOTTOM_TAPPABLE_ELEMENT }
        );

        TaskbarContainerView.LayoutParams taskbarLayoutParams =
                new TaskbarContainerView.LayoutParams(mTaskbarSize.x, mTaskbarSize.y);
        taskbarLayoutParams.gravity = gravity;
        mTaskbarView.setLayoutParams(taskbarLayoutParams);

        mWindowManager.addView(mTaskbarContainerView, mWindowLayoutParams);
    }
}