/* Copyright (C) 2019
 * swift project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 */

//! \file

#ifndef BLACKCORE_AFV_AUDIO_AUDIO_INPUT_H
#define BLACKCORE_AFV_AUDIO_AUDIO_INPUT_H

#include "blacksound/sampleprovider/bufferedwaveprovider.h"
#include "blacksound/codecs/opusencoder.h"
#include "blackmisc/audio/audiodeviceinfo.h"

#ifdef Q_OS_MAC
#include "blackmisc/macos/microphoneaccess.h"
#endif

#include <QAudioInput>
#include <QString>
#include <QDateTime>
#include <QSharedPointer>

namespace BlackCore
{
    namespace Afv
    {
        namespace Audio
        {
            //! Input buffer
            class CAudioInputBuffer : public QIODevice
            {
                Q_OBJECT

            public:
                //! Inout buffer
                CAudioInputBuffer(QObject *parent);

                //! Start
                void start(const QAudioFormat &format);

                //! Stop
                void stop();

                //! \copydoc QIODevice::readData
                virtual qint64 readData(char *data, qint64 maxlen) override;

                //! \copydoc QIODevice::writeData
                virtual qint64 writeData(const char *data, qint64 len) override;

            signals:
                //! Frame is available
                void frameAvailable(const QByteArray &frame);

            private:
                static constexpr qint64 frameSize = 960;
                QByteArray   m_buffer;
                QAudioFormat m_format;
            };

            //! Opus data arguments
            struct OpusDataAvailableArgs
            {
                uint sequenceCounter = 0;   //!< sequence counter
                QByteArray audio;           //!< audio data
            };

            //! Input volume stream arguments
            struct InputVolumeStreamArgs
            {
                //! Peak volume raw
                double PeakRaw = 0.0;

                //! Peak volume in dB
                double PeakDB  = -1.0 * std::numeric_limits<double>::infinity();

                //! Peak volume in VU
                double PeakVU  = 0.0;
            };

            //! Input
            class CInput : public QObject
            {
                Q_OBJECT

            public:
                //! Ctor
                CInput(int sampleRate, QObject *parent = nullptr);

                //! Dtor
                virtual ~CInput() override
                {
                    this->stop();
                }

                //! Number of encoded bytes @{
                int opusBytesEncoded() const { return m_opusBytesEncoded; }
                void setOpusBytesEncoded(int opusBytesEncoded) { m_opusBytesEncoded = opusBytesEncoded; }
                //! @}

                //! Volume @{
                double volume() const { return m_volume; }
                bool setVolume(double volume);
                //! @}

                //! Started?
                bool started() const { return m_started; }

                //! Start
                void start(const BlackMisc::Audio::CAudioDeviceInfo &inputDevice);

                //! Stop
                void stop();

                //! Corresponding device
                const BlackMisc::Audio::CAudioDeviceInfo &device() const { return m_device; }

            signals:
                //! Volume stream data
                void inputVolumeStream(const InputVolumeStreamArgs &args);

                //! OPUS data
                void opusDataAvailable(const OpusDataAvailableArgs &args);

            private:
                void audioInDataAvailable(const QByteArray &frame);

                static constexpr qint64 c_frameSize = 960;
                int m_sampleRate = 0;

                BlackSound::Codecs::COpusEncoder   m_encoder;
                QScopedPointer<QAudioInput>        m_audioInput;
                BlackMisc::Audio::CAudioDeviceInfo m_device;
                QAudioFormat                       m_inputFormat;

                bool m_started = false;
                int m_opusBytesEncoded  = 0;
                int m_sampleCount       = 0;
                double m_volume         = 1.0;
                qint16 m_maxSampleInput = 0.0;

                const int SampleCountPerEvent = 4800;
                const double maxDb =   0;
                const double minDb = -40;

                uint m_audioSequenceCounter = 0;
                CAudioInputBuffer *m_audioInputBuffer = nullptr;

#ifdef Q_OS_MAC
                BlackMisc::CMacOSMicrophoneAccess m_micAccess;
                void delayedInitMicrophone();
#endif
            };
        } // ns
    } // ns
} // ns

#endif // guard