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#include "qqnxscreeneventthread.h"
#include "qqnxscreeneventhandler.h"

#include <QtCore/QDebug>

#include <errno.h>
#include <unistd.h>

#include <cctype>

#if defined(QQNXSCREENEVENTTHREAD_DEBUG)
#define qScreenEventThreadDebug qDebug
#else
#define qScreenEventThreadDebug QT_NO_QDEBUG_MACRO
#endif

QQnxScreenEventThread::QQnxScreenEventThread(screen_context_t context, QQnxScreenEventHandler *screenEventHandler)
    : QThread(),
      m_screenContext(context),
      m_screenEventHandler(screenEventHandler),
      m_quit(false)
{
    screenEventHandler->setScreenEventThread(this);
    connect(this, SIGNAL(eventPending()), screenEventHandler, SLOT(processEventsFromScreenThread()), Qt::QueuedConnection);
    connect(this, SIGNAL(finished()), screenEventHandler, SLOT(processEventsFromScreenThread()), Qt::QueuedConnection);
}

QQnxScreenEventThread::~QQnxScreenEventThread()
{
    // block until thread terminates
    shutdown();
}

void QQnxScreenEventThread::injectKeyboardEvent(int flags, int sym, int mod, int scan, int cap)
{
    QQnxScreenEventHandler::injectKeyboardEvent(flags, sym, mod, scan, cap);
}

QQnxScreenEventArray *QQnxScreenEventThread::lock()
{
    m_mutex.lock();
    return &m_events;
}

void QQnxScreenEventThread::unlock()
{
    m_mutex.unlock();
}

void QQnxScreenEventThread::run()
{
    qScreenEventThreadDebug() << Q_FUNC_INFO << "screen event thread started";

    // loop indefinitely
    while (!m_quit) {
        screen_event_t event;

        // create screen event
        errno = 0;
        int result = screen_create_event(&event);
        if (result)
            qFatal("QQNX: failed to create screen event, errno=%d", errno);


        // block until screen event is available
        errno = 0;
        result = screen_get_event(m_screenContext, event, -1);
        if (result)
            qFatal("QQNX: failed to get screen event, errno=%d", errno);

        // process received event
        // get the event type
        errno = 0;
        int qnxType;
        result = screen_get_event_property_iv(event, SCREEN_PROPERTY_TYPE, &qnxType);
        if (result)
            qFatal("QQNX: failed to query screen event type, errno=%d", errno);

        if (qnxType == SCREEN_EVENT_USER) {
            // treat all user events as shutdown requests
            qScreenEventThreadDebug() << Q_FUNC_INFO << "QNX user screen event";
            m_quit = true;
        } else {
            m_mutex.lock();
            m_events << event;
            m_mutex.unlock();
            emit eventPending();
        }
    }

    qScreenEventThreadDebug() << Q_FUNC_INFO << "screen event thread stopped";

    // cleanup
    m_mutex.lock();
    Q_FOREACH (screen_event_t event, m_events) {
        screen_destroy_event(event);
    }
    m_events.clear();
    m_mutex.unlock();
}

void QQnxScreenEventThread::shutdown()
{
    screen_event_t event;

    // create screen event
    errno = 0;
    int result = screen_create_event(&event);
    if (result)
        qFatal("QQNX: failed to create screen event, errno=%d", errno);

    // set the event type as user
    errno = 0;
    int type = SCREEN_EVENT_USER;
    result = screen_set_event_property_iv(event, SCREEN_PROPERTY_TYPE, &type);
    if (result)
        qFatal("QQNX: failed to set screen event type, errno=%d", errno);

    // NOTE: ignore SCREEN_PROPERTY_USER_DATA; treat all user events as shutdown events

    // post event to event loop so it will wake up and die
    errno = 0;
    result = screen_send_event(m_screenContext, event, getpid());
    if (result)
        qFatal("QQNX: failed to set screen event type, errno=%d", errno);

    // cleanup
    screen_destroy_event(event);

    qScreenEventThreadDebug() << Q_FUNC_INFO << "screen event thread shutdown begin";

    // block until thread terminates
    wait();

    qScreenEventThreadDebug() << Q_FUNC_INFO << "screen event thread shutdown end";
}