/*
 * 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.settings.display;

import static android.hardware.SensorPrivacyManager.Sensors.CAMERA;
import static android.hardware.SensorPrivacyManager.Sources.DIALOG;

import static androidx.lifecycle.Lifecycle.Event.ON_START;
import static androidx.lifecycle.Lifecycle.Event.ON_STOP;

import android.content.Context;
import android.hardware.SensorPrivacyManager;

import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleObserver;
import androidx.lifecycle.OnLifecycleEvent;
import androidx.preference.PreferenceScreen;

import com.android.internal.annotations.VisibleForTesting;
import com.android.settings.R;
import com.android.settingslib.widget.BannerMessagePreference;

/**
 * The controller of Screen attention's camera disabled warning preference.
 * The preference appears when the camera access is disabled for Screen Attention feature.
 */
public class AdaptiveSleepCameraStatePreferenceController implements LifecycleObserver {
    @VisibleForTesting
    BannerMessagePreference mPreference;
    private final SensorPrivacyManager mPrivacyManager;
    private final Context mContext;

    private final SensorPrivacyManager.OnSensorPrivacyChangedListener mPrivacyChangedListener =
            new SensorPrivacyManager.OnSensorPrivacyChangedListener() {
                @Override
                public void onSensorPrivacyChanged(int sensor, boolean enabled) {
                    updateVisibility();
                }
            };

    public AdaptiveSleepCameraStatePreferenceController(Context context, Lifecycle lifecycle) {
        mPrivacyManager = SensorPrivacyManager.getInstance(context);
        mContext = context;
        lifecycle.addObserver(this);
    }

    @OnLifecycleEvent(ON_START)
    public void onStart() {
        mPrivacyManager.addSensorPrivacyListener(CAMERA, mPrivacyChangedListener);
    }

    @OnLifecycleEvent(ON_STOP)
    public void onStop() {
        mPrivacyManager.removeSensorPrivacyListener(CAMERA, mPrivacyChangedListener);
    }

    /**
     * Adds the controlled preference to the provided preference screen.
     */
    public void addToScreen(PreferenceScreen screen) {
        initializePreference();
        screen.addPreference(mPreference);
        updateVisibility();
    }

    /**
     * Need this because all controller tests use Robolectric. No easy way to mock this service,
     * so we mock the call we need
     */
    @VisibleForTesting
    boolean isCameraLocked() {
        return mPrivacyManager.isSensorPrivacyEnabled(CAMERA);
    }

    /**
     * Refreshes the visibility of the preference.
     */
    public void updateVisibility() {
        initializePreference();
        mPreference.setVisible(isCameraLocked());
    }

    private void initializePreference() {
        if (mPreference == null) {
            mPreference = new BannerMessagePreference(mContext);
            mPreference.setTitle(R.string.auto_rotate_camera_lock_title);
            mPreference.setSummary(R.string.adaptive_sleep_camera_lock_summary);
            mPreference.setPositiveButtonText(R.string.allow);
            mPreference.setPositiveButtonOnClickListener(
                    p -> mPrivacyManager.setSensorPrivacy(DIALOG, CAMERA, false));
        }
    }
}