/*
 * Copyright (C) 2019 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.settings.gestures;

import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_2BUTTON;
import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.RemoteException;
import android.view.Display;
import android.view.IWindowManager;
import android.view.WindowManagerGlobal;

import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;

public class SystemNavigationPreferenceController extends BasePreferenceController {

    static final String PREF_KEY_SYSTEM_NAVIGATION = "gesture_system_navigation";
    private static final String ACTION_QUICKSTEP = "android.intent.action.QUICKSTEP_SERVICE";

    public SystemNavigationPreferenceController(Context context, String key) {
        super(context, key);
    }

    @Override
    public int getAvailabilityStatus() {
        return isGestureAvailable(mContext) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
    }

    @Override
    public CharSequence getSummary() {
        if (isGestureNavigationEnabled(mContext)) {
            return mContext.getText(R.string.edge_to_edge_navigation_title);
        } else if (is2ButtonNavigationEnabled(mContext)) {
            return mContext.getText(R.string.swipe_up_to_switch_apps_title);
        } else {
            return mContext.getText(R.string.legacy_navigation_title);
        }
    }

    /** Returns {@code true} if gesture is available. */
    public static boolean isGestureAvailable(Context context) {
        boolean hasNavigationBar = false;
        final boolean configEnabled = context.getResources().getBoolean(
                com.android.internal.R.bool.config_swipe_up_gesture_setting_available);

        try {
            IWindowManager windowManager = WindowManagerGlobal.getWindowManagerService();
            hasNavigationBar = windowManager.hasNavigationBar(Display.DEFAULT_DISPLAY);
        } catch (RemoteException ex) {
            // no window manager? good luck with that
        }

        // Skip if the swipe up settings are not available
        // or if on-screen navbar is disabled (for devices with hardware keys)
        if (!configEnabled || !hasNavigationBar) {
            return false;
        }

        // Skip if the recents component is not defined
        final ComponentName recentsComponentName = ComponentName.unflattenFromString(
                context.getString(com.android.internal.R.string.config_recentsComponentName));
        if (recentsComponentName == null) {
            return false;
        }

        // Skip if the overview proxy service exists
        final Intent quickStepIntent = new Intent(ACTION_QUICKSTEP)
                .setPackage(recentsComponentName.getPackageName());
        if (context.getPackageManager().resolveService(quickStepIntent,
                PackageManager.MATCH_SYSTEM_ONLY) == null) {
            return false;
        }

        return true;
    }

    static boolean isOverlayPackageAvailable(Context context, String overlayPackage) {
        try {
            return context.getPackageManager().getPackageInfo(overlayPackage, 0) != null;
        } catch (PackageManager.NameNotFoundException e) {
            // Not found, just return unavailable
            return false;
        }
    }

    static boolean is2ButtonNavigationEnabled(Context context) {
        return NAV_BAR_MODE_2BUTTON == context.getResources().getInteger(
                com.android.internal.R.integer.config_navBarInteractionMode);
    }

    static boolean isGestureNavigationEnabled(Context context) {
        return NAV_BAR_MODE_GESTURAL == context.getResources().getInteger(
                com.android.internal.R.integer.config_navBarInteractionMode);
    }
}
