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#include "qevdevtouchmanager_p.h"
#include "qevdevtouchhandler_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(qLcEvdevTouch)

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

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

    QString spec = QString::fromLocal8Bit(qgetenv("QT_QPA_EVDEV_TOUCHSCREEN_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(qLcEvdevTouch) << "evdevtouch: Using device discovery";
        m_deviceDiscovery = QDeviceDiscovery::create(QDeviceDiscovery::Device_Touchpad | QDeviceDiscovery::Device_Touchscreen, this);
        if (m_deviceDiscovery) {
            const QStringList devices = m_deviceDiscovery->scanConnectedDevices();
            for (const QString &device : devices)
                addDevice(device);
            connect(m_deviceDiscovery, SIGNAL(deviceDetected(QString)), this, SLOT(addDevice(QString)));
            connect(m_deviceDiscovery, SIGNAL(deviceRemoved(QString)), this, SLOT(removeDevice(QString)));
        }
    }
}

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

void QEvdevTouchManager::addDevice(const QString &deviceNode)
{
    qCDebug(qLcEvdevTouch) << "evdevtouch: Adding device at" << deviceNode;
    QEvdevTouchScreenHandlerThread *handler;
    handler = new QEvdevTouchScreenHandlerThread(deviceNode, m_spec);
    if (handler) {
        m_activeDevices.insert(deviceNode, handler);
        connect(handler, &QEvdevTouchScreenHandlerThread::touchDeviceRegistered, this, &QEvdevTouchManager::updateInputDeviceCount);
    } else {
        qWarning("evdevtouch: Failed to open touch device %s", qPrintable(deviceNode));
    }
}

void QEvdevTouchManager::removeDevice(const QString &deviceNode)
{
    if (m_activeDevices.contains(deviceNode)) {
        qCDebug(qLcEvdevTouch) << "evdevtouch: Removing device at" << deviceNode;
        QEvdevTouchScreenHandlerThread *handler = m_activeDevices.value(deviceNode);
        m_activeDevices.remove(deviceNode);
        delete handler;

        updateInputDeviceCount();
    }
}

void QEvdevTouchManager::updateInputDeviceCount()
{
    int registeredTouchDevices = 0;
    Q_FOREACH (QEvdevTouchScreenHandlerThread *handler, m_activeDevices) {
        if (handler->isTouchDeviceRegistered())
            ++registeredTouchDevices;
    }

    qCDebug(qLcEvdevTouch) << "evdevtouch: Updating QInputDeviceManager device count:" << registeredTouchDevices << " touch devices,"
                           << m_activeDevices.count() - registeredTouchDevices << "pending handler(s)" ;

    QInputDeviceManagerPrivate::get(QGuiApplicationPrivate::inputDeviceManager())->setDeviceCount(
        QInputDeviceManager::DeviceTypeTouch, registeredTouchDevices);
}

QT_END_NAMESPACE
