/*
 * Copyright (C) 2017 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.display;

import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.display.AmbientDisplayConfiguration;
import android.os.PowerManager;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.provider.Settings;
import android.text.TextUtils;

import androidx.preference.Preference;

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

public class AmbientDisplayAlwaysOnPreferenceController extends TogglePreferenceController {

    private final int ON = 1;
    private final int OFF = 0;

    private static final int MY_USER = UserHandle.myUserId();
    private static final String PROP_AWARE_AVAILABLE = "ro.vendor.aware_available";
    private static final String AOD_SUPPRESSED_TOKEN = "winddown";

    private AmbientDisplayConfiguration mConfig;

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

    @Override
    public int getAvailabilityStatus() {
        return isAvailable(getConfig())
                && !SystemProperties.getBoolean(PROP_AWARE_AVAILABLE, false) ?
                AVAILABLE : UNSUPPORTED_ON_DEVICE;
    }

    @Override
    public void updateState(Preference preference) {
        super.updateState(preference);
        refreshSummary(preference);
    }

    @Override
    public boolean isSliceable() {
        return TextUtils.equals(getPreferenceKey(), "ambient_display_always_on");
    }

    @Override
    public boolean isPublicSlice() {
        return true;
    }

    @Override
    public boolean isChecked() {
        return getConfig().alwaysOnEnabled(MY_USER);
    }

    @Override
    public boolean setChecked(boolean isChecked) {
        int enabled = isChecked ? ON : OFF;
        Settings.Secure.putInt(
                mContext.getContentResolver(), Settings.Secure.DOZE_ALWAYS_ON, enabled);
        return true;
    }

    @Override
    public CharSequence getSummary() {
        return mContext.getText(
                isAodSuppressedByBedtime(mContext) ? R.string.aware_summary_when_bedtime_on
                        : R.string.doze_always_on_summary);
    }

    public AmbientDisplayAlwaysOnPreferenceController setConfig(
            AmbientDisplayConfiguration config) {
        mConfig = config;
        return this;
    }

    public static boolean isAvailable(AmbientDisplayConfiguration config) {
        return config.alwaysOnAvailableForUser(MY_USER);
    }

    private AmbientDisplayConfiguration getConfig() {
        if (mConfig == null) {
            mConfig = new AmbientDisplayConfiguration(mContext);
        }
        return mConfig;
    }

    /**
     * Returns whether AOD is suppressed by Bedtime mode, a feature of Digital Wellbeing.
     *
     * We know that Bedtime mode suppresses AOD using {@link AOD_SUPPRESSED_TOKEN}. If the Digital
     * Wellbeing app is suppressing AOD with {@link AOD_SUPPRESSED_TOKEN}, then we can infer that
     * AOD is being suppressed by Bedtime mode.
     */
    public static boolean isAodSuppressedByBedtime(Context context) {
        int uid;
        final PowerManager powerManager = context.getSystemService(PowerManager.class);
        final PackageManager packageManager = context.getPackageManager();
        final String packageName = context.getString(
                com.android.internal.R.string.config_defaultWellbeingPackage);
        try {
            uid = packageManager.getApplicationInfo(packageName, /* flags= */ 0).uid;
        } catch (PackageManager.NameNotFoundException e) {
            return false;
        }
        return powerManager.isAmbientDisplaySuppressedForTokenByApp(AOD_SUPPRESSED_TOKEN, uid);
    }
}