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#include "qinputinfomanagermir_p.h"
#include "linux/input-event-codes.h"
#include <QTimer>

static void no_input_config_yet(MirInputConfig const*) {}

QInputInfoManagerMir::QInputInfoManagerMir(MirConnectionPtr con, QObject *parent)
    : QInputInfoManagerPrivate(parent), connection{std::move(con)}, config{nullptr, &no_input_config_yet}
{
    if (connection && mir_connection_is_valid(connection.get()))
        QTimer::singleShot(250,this,SLOT(init()));
}

QInputInfoManagerMir::~QInputInfoManagerMir()
{
}

void QInputInfoManagerMir::init()
{
    config = MirInputConfigPtr{mir_connection_create_input_config(connection.get()), mir_input_config_destroy};

    mir_connection_set_input_config_change_callback(
        connection.get(),
        [](MirConnection* con, void* context) {
            QInputInfoManagerMir *this_ = static_cast<QInputInfoManagerMir*>(context);
            this_->config = MirInputConfigPtr{mir_connection_create_input_config(con), mir_input_config_destroy};
            this_->update_devices();
        }, this);

    update_devices();
}

void QInputInfoManagerMir::update_devices()
{
    QList<QString> deletedDevices = deviceMap.keys();

    for (int index = 0, e = mir_input_config_device_count(config.get()); index!=e; ++index) {

        MirInputDevice const *input_device = mir_input_config_get_device(
            config.get(),
            index);

        QString id = QString::number(mir_input_device_get_id(input_device));
        if (!deviceMap.contains(id)) {
            QInputDevice *nDevice = new QInputDevice(this);
            nDevice->setName(QString::fromUtf8(mir_input_device_get_name(input_device)));
            nDevice->setIdentifier(id);
            QInputDevice::InputTypeFlags flags = QInputDevice::UnknownType;

            MirInputDeviceCapabilities caps = mir_input_device_get_capabilities(input_device);

            if (caps & mir_input_device_capability_pointer) {
                nDevice->addRelativeAxis(REL_X);
                nDevice->addRelativeAxis(REL_Y);
                nDevice->addRelativeAxis(REL_WHEEL);
                nDevice->addButton(BTN_MOUSE);
                nDevice->addButton(BTN_RIGHT);
                nDevice->addButton(BTN_MIDDLE);
                if (caps & mir_input_device_capability_touchpad) {
                    flags |= QInputDevice::TouchPad;
                } else {
                    flags |= QInputDevice::Mouse;
                    nDevice->addButton(BTN_SIDE);
                    nDevice->addButton(BTN_EXTRA);
                    nDevice->addButton(BTN_FORWARD);
                    nDevice->addButton(BTN_BACK);
                    nDevice->addButton(BTN_TASK);
                }
            }

            if (caps & mir_input_device_capability_keyboard) {
                flags |= QInputDevice::Button;

                // keyboard with enough keys for text entry
                if (caps & mir_input_device_capability_alpha_numeric) {
                    flags |= QInputDevice::Keyboard;
                    for (int i = KEY_1; i != KEY_SLASH; ++i)
                        nDevice->addButton(i);
                }
            }

            nDevice->setTypes(flags);

            deviceMap.insert(id, nDevice);
            deviceList.push_back(nDevice);

            Q_EMIT deviceAdded(nDevice);
        } else {
            deletedDevices.removeOne(id);
        }
    }

    for (QList<QString>::const_iterator it = deletedDevices.begin(), e = deletedDevices.end();
         it != e ; ++it) {
        QInputDevice * device = deviceMap.take(*it);
        deviceList.removeOne(device);
        Q_EMIT deviceRemoved(*it);
        delete device;
    }
    Q_EMIT ready();
}