// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qalsamediadevices_p.h"
#include "qmediadevices.h"
#include "qcameradevice_p.h"

#include "private/qalsaaudiosource_p.h"
#include "private/qalsaaudiosink_p.h"
#include "private/qalsaaudiodevice_p.h"

#include <alsa/asoundlib.h>

QT_BEGIN_NAMESPACE

QAlsaMediaDevices::QAlsaMediaDevices()
    : QPlatformMediaDevices()
{
}

static QList<QAudioDevice> availableDevices(QAudioDevice::Mode mode)
{
    QList<QAudioDevice> devices;

    QByteArray filter;

    // Create a list of all current audio devices that support mode
    void **hints, **n;
    char *name, *descr, *io;
    bool hasDefault = false;

    if(snd_device_name_hint(-1, "pcm", &hints) < 0) {
        qWarning() << "no alsa devices available";
        return devices;
    }
    n = hints;

    if(mode == QAudioDevice::Input) {
        filter = "Input";
    } else {
        filter = "Output";
    }

    QAlsaAudioDeviceInfo* sysdefault = nullptr;

    while (*n != NULL) {
        name = snd_device_name_get_hint(*n, "NAME");
        if (name != 0 && qstrcmp(name, "null") != 0) {
            descr = snd_device_name_get_hint(*n, "DESC");
            io = snd_device_name_get_hint(*n, "IOID");

            if ((descr != NULL) && ((io == NULL) || (io == filter))) {
                auto *infop = new QAlsaAudioDeviceInfo(name, QString::fromUtf8(descr), mode);
                devices.append(infop->create());
                if (!hasDefault && strcmp(name, "default") == 0) {
                    infop->isDefault = true;
                    hasDefault = true;
                }
                else if (!sysdefault && !hasDefault && strcmp(name, "sysdefault") == 0) {
                    sysdefault = infop;
                }
            }

            free(descr);
            free(io);
        }
        free(name);
        ++n;
    }
    snd_device_name_free_hint(hints);

    if (!hasDefault && sysdefault) {
        // Make "sysdefault" the default device if there is no "default" device exists
        sysdefault->isDefault = true;
        hasDefault = true;
    }
    if (!hasDefault && devices.size() > 0) {
        auto infop = new QAlsaAudioDeviceInfo("default", QString(), QAudioDevice::Output);
        infop->isDefault = true;
        devices.prepend(infop->create());
    }

    return devices;
}

QList<QAudioDevice> QAlsaMediaDevices::audioInputs() const
{
    return availableDevices(QAudioDevice::Input);
}

QList<QAudioDevice> QAlsaMediaDevices::audioOutputs() const
{
    return availableDevices(QAudioDevice::Output);
}

QPlatformAudioSource *QAlsaMediaDevices::createAudioSource(const QAudioDevice &deviceInfo,
                                                           QObject *parent)
{
    return new QAlsaAudioSource(deviceInfo.id(), parent);
}

QPlatformAudioSink *QAlsaMediaDevices::createAudioSink(const QAudioDevice &deviceInfo,
                                                       QObject *parent)
{
    return new QAlsaAudioSink(deviceInfo.id(), parent);
}

QT_END_NAMESPACE
