/*
 * Copyright (C) 2023 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.car.audio;

import static android.util.Log.DEBUG;

import static com.android.car.CarLog.TAG_AUDIO;

import android.car.builtin.util.Slogf;
import android.media.AudioManager;

import java.util.Objects;
import java.util.concurrent.Executor;

final class CoreAudioVolumeGroupCallback extends AudioManager.VolumeGroupCallback {
    static final String TAG = TAG_AUDIO + ".CoreAudioVolumeGroupCallback";

    private final CarVolumeInfoWrapper mCarVolumeInfoWrapper;
    private final AudioManagerWrapper mAudioManager;
    private final Executor mExecutor;

    CoreAudioVolumeGroupCallback(CarVolumeInfoWrapper carVolumeInfoWrapper,
            AudioManagerWrapper audioManager, Executor executor) {
        mCarVolumeInfoWrapper = Objects.requireNonNull(carVolumeInfoWrapper,
                "CarVolumeInfoWrapper cannot be null");
        mAudioManager = Objects.requireNonNull(audioManager, "AudioManager cannot be null");
        mExecutor = Objects.requireNonNull(executor, "Executor cannot be null");
    }

    public void init() {
        mAudioManager.registerVolumeGroupCallback(mExecutor, this);
        if (Slogf.isLoggable(TAG_AUDIO, DEBUG)) {
            Slogf.d(TAG, "Registered car audio volume group callback");
        }
    }

    public void release() {
        if (Slogf.isLoggable(TAG_AUDIO, DEBUG)) {
            Slogf.d(TAG, "Unregistering car audio volume group callback");
        }
        mAudioManager.unregisterVolumeGroupCallback(this);
    }

    /**
     * The volume group changed callback is initiated by AudioPolicyManager whenever a volume group
     * index is changed from {@link AudioManager#setVolumeGroupVolumeIndex}, meaning the volume
     * change is initiated by a client. It is not invoked when the AudioPolicyManager really sets
     * the port gain (e.g. when group is currently active or when a playback following this volume
     * group is started).
     * @param groupId to change
     * @param flags describing the volume change event.
     */
    @Override
    public void onAudioVolumeGroupChanged(int groupId, int flags) {
        if (Slogf.isLoggable(TAG_AUDIO, DEBUG)) {
            Slogf.d(TAG, "onAudioVolumeGroupChanged: volume group: %d", groupId);
        }
        String groupName = CoreAudioHelper.getVolumeGroupNameFromCoreId(groupId);
        if (groupName == null) {
            Slogf.w(TAG, "onAudioVolumeGroupChanged no group for id(%d)", groupId);
            return;
        }
        // Note: FLAG_SHOW_UI is added as not managed by AudioPolicyManager.
        mCarVolumeInfoWrapper.onAudioVolumeGroupChanged(groupName,
                flags | AudioManager.FLAG_SHOW_UI);
    }
}