/*
 * Copyright (C) 2015-2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Google Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */

#include "config.h"
#include "MockRealtimeAudioSource.h"

#if ENABLE(MEDIA_STREAM)
#include "AudioSession.h"
#include "CaptureDevice.h"
#include "Logging.h"
#include "MediaConstraints.h"
#include "MockRealtimeMediaSourceCenter.h"
#include "NotImplemented.h"
#include "PlatformMediaSessionManager.h"
#include "RealtimeMediaSourceSettings.h"
#include <wtf/UUID.h>

namespace WebCore {

#if !PLATFORM(MAC) && !PLATFORM(IOS_FAMILY) && !(USE(GSTREAMER) && USE(LIBWEBRTC))
CaptureSourceOrError MockRealtimeAudioSource::create(String&& deviceID, String&& name, String&& hashSalt, const MediaConstraints* constraints)
{
#ifndef NDEBUG
    auto device = MockRealtimeMediaSourceCenter::mockDeviceWithPersistentID(deviceID);
    ASSERT(device);
    if (!device)
        return { "No mock microphone device"_s };
#endif

    auto source = adoptRef(*new MockRealtimeAudioSource(WTFMove(deviceID), WTFMove(name), WTFMove(hashSalt)));
    if (constraints && source->applyConstraints(*constraints))
        return { };

    return CaptureSourceOrError(WTFMove(source));
}
#endif

MockRealtimeAudioSource::MockRealtimeAudioSource(String&& deviceID, String&& name, String&& hashSalt)
    : RealtimeMediaSource(RealtimeMediaSource::Type::Audio, WTFMove(name), WTFMove(deviceID), WTFMove(hashSalt))
    , m_workQueue(WorkQueue::create("MockRealtimeAudioSource Render Queue"))
    , m_timer(RunLoop::current(), this, &MockRealtimeAudioSource::tick)
{
    auto device = MockRealtimeMediaSourceCenter::mockDeviceWithPersistentID(persistentID());
    ASSERT(device);
    m_device = *device;

    setSampleRate(WTF::get<MockMicrophoneProperties>(m_device.properties).defaultSampleRate);
    initializeEchoCancellation(true);
}

MockRealtimeAudioSource::~MockRealtimeAudioSource()
{
#if PLATFORM(IOS_FAMILY)
    RealtimeMediaSourceCenter::singleton().audioCaptureFactory().unsetActiveSource(*this);
#endif
}

const RealtimeMediaSourceSettings& MockRealtimeAudioSource::settings()
{
    if (!m_currentSettings) {
        RealtimeMediaSourceSettings settings;
        settings.setDeviceId(hashedId());
        settings.setVolume(volume());
        settings.setEchoCancellation(echoCancellation());
        settings.setSampleRate(sampleRate());

        RealtimeMediaSourceSupportedConstraints supportedConstraints;
        supportedConstraints.setSupportsDeviceId(true);
        supportedConstraints.setSupportsVolume(true);
        supportedConstraints.setSupportsEchoCancellation(true);
        supportedConstraints.setSupportsSampleRate(true);
        settings.setSupportedConstraints(supportedConstraints);

        m_currentSettings = WTFMove(settings);
    }
    return m_currentSettings.value();
}

void MockRealtimeAudioSource::setChannelCount(unsigned channelCount)
{
    if (channelCount > 2)
        return;

    m_channelCount = channelCount;
    settingsDidChange(RealtimeMediaSourceSettings::Flag::SampleRate);
}

const RealtimeMediaSourceCapabilities& MockRealtimeAudioSource::capabilities()
{
    if (!m_capabilities) {
        RealtimeMediaSourceCapabilities capabilities(settings().supportedConstraints());

        capabilities.setDeviceId(hashedId());
        capabilities.setVolume(CapabilityValueOrRange(0.0, 1.0));
        capabilities.setEchoCancellation(RealtimeMediaSourceCapabilities::EchoCancellation::ReadWrite);
        capabilities.setSampleRate(CapabilityValueOrRange(44100, 48000));

        m_capabilities = WTFMove(capabilities);
    }
    return m_capabilities.value();
}

void MockRealtimeAudioSource::settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>)
{
    m_currentSettings = WTF::nullopt;
}

void MockRealtimeAudioSource::startProducingData()
{
#if PLATFORM(IOS_FAMILY)
    RealtimeMediaSourceCenter::singleton().audioCaptureFactory().setActiveSource(*this);
    PlatformMediaSessionManager::sharedManager().sessionCanProduceAudioChanged();
    ASSERT(AudioSession::sharedSession().category() == AudioSession::PlayAndRecord);
#endif

    if (!sampleRate())
        setSampleRate(WTF::get<MockMicrophoneProperties>(m_device.properties).defaultSampleRate);

    m_startTime = MonotonicTime::now();
    m_timer.startRepeating(renderInterval());
}

void MockRealtimeAudioSource::stopProducingData()
{
    m_timer.stop();
    m_startTime = MonotonicTime::nan();
}

void MockRealtimeAudioSource::tick()
{
    if (std::isnan(m_lastRenderTime))
        m_lastRenderTime = MonotonicTime::now();

    MonotonicTime now = MonotonicTime::now();

    if (m_delayUntil) {
        if (m_delayUntil < now)
            return;
        m_delayUntil = MonotonicTime();
    }

    Seconds delta = now - m_lastRenderTime;
    m_lastRenderTime = now;

    m_workQueue->dispatch([this, delta, protectedThis = makeRef(*this)] {
        render(delta);
    });
}

void MockRealtimeAudioSource::delaySamples(Seconds delta)
{
    m_delayUntil = MonotonicTime::now() + delta;
}

} // namespace WebCore

#endif // ENABLE(MEDIA_STREAM)