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#include "qevdevtabletmanager_p.h"
#include "qevdevtablethandler_p.h"

#include <QStringList>
#include <QGuiApplication>
#include <QLoggingCategory>
#include <QtDeviceDiscoverySupport/private/qdevicediscovery_p.h>
#include <private/qguiapplication_p.h>
#include <private/qinputdevicemanager_p_p.h>

QT_BEGIN_NAMESPACE

Q_DECLARE_LOGGING_CATEGORY(qLcEvdevTablet)

QEvdevTabletManager::QEvdevTabletManager(const QString &key, const QString &specification, QObject *parent)
    : QObject(parent)
{
    Q_UNUSED(key);

    if (qEnvironmentVariableIsSet("QT_QPA_EVDEV_DEBUG"))
        const_cast<QLoggingCategory &>(qLcEvdevTablet()).setEnabled(QtDebugMsg, true);

    QString spec = QString::fromLocal8Bit(qgetenv("QT_QPA_EVDEV_TABLET_PARAMETERS"));

    if (spec.isEmpty())
        spec = specification;

    QStringList args = spec.split(QLatin1Char(':'));
    QStringList devices;

    foreach (const QString &arg, args) {
        if (arg.startsWith(QLatin1String("/dev/"))) {
            devices.append(arg);
            args.removeAll(arg);
        }
    }

    // build new specification without /dev/ elements
    m_spec = args.join(QLatin1Char(':'));

    foreach (const QString &device, devices)
        addDevice(device);

    // when no devices specified, use device discovery to scan and monitor
    if (devices.isEmpty()) {
        qCDebug(qLcEvdevTablet) << "evdevtablet: Using device discovery";
        m_deviceDiscovery = QDeviceDiscovery::create(QDeviceDiscovery::Device_Tablet, this);
        if (m_deviceDiscovery) {
            const QStringList devices = m_deviceDiscovery->scanConnectedDevices();
            for (const QString &device : devices)
                addDevice(device);

            connect(m_deviceDiscovery, &QDeviceDiscovery::deviceDetected,
                    this, &QEvdevTabletManager::addDevice);
            connect(m_deviceDiscovery, &QDeviceDiscovery::deviceRemoved,
                    this, &QEvdevTabletManager::removeDevice);
        }
    }
}

QEvdevTabletManager::~QEvdevTabletManager()
{
    qDeleteAll(m_activeDevices);
}

void QEvdevTabletManager::addDevice(const QString &deviceNode)
{
    qCDebug(qLcEvdevTablet) << "Adding device at" << deviceNode;
    QEvdevTabletHandlerThread *handler;
    handler = new QEvdevTabletHandlerThread(deviceNode, m_spec);
    if (handler) {
        m_activeDevices.insert(deviceNode, handler);
        QInputDeviceManagerPrivate::get(QGuiApplicationPrivate::inputDeviceManager())->setDeviceCount(
            QInputDeviceManager::DeviceTypeTablet, m_activeDevices.count());
    } else {
        qWarning("evdevtablet: Failed to open tablet device %s", qPrintable(deviceNode));
    }
}

void QEvdevTabletManager::removeDevice(const QString &deviceNode)
{
    if (m_activeDevices.contains(deviceNode)) {
        qCDebug(qLcEvdevTablet) << "Removing device at" << deviceNode;
        QEvdevTabletHandlerThread *handler = m_activeDevices.value(deviceNode);
        m_activeDevices.remove(deviceNode);
        QInputDeviceManagerPrivate::get(QGuiApplicationPrivate::inputDeviceManager())->setDeviceCount(
            QInputDeviceManager::DeviceTypeTablet, m_activeDevices.count());
        delete handler;
    }
}

QT_END_NAMESPACE