#include "CursorController.h"
#include <QWidget>
#include <QCursor>
#include <QApplication>
#include <QScreen>
#include <QMouseEvent>
#include <QDebug>

CursorController::CursorController(QObject *parent)
    : QObject(parent)
{
    // 判断能否真正移动系统光标
    m_useRealCursor = QGuiApplication::platformName() != "eglfs"
                   && QGuiApplication::platformName() != "linuxfb"
                   && QGuiApplication::platformName() != "minimal";

    if (!m_useRealCursor)
        m_pos = QGuiApplication::primaryScreen()->geometry().center();
    else
        m_pos = QCursor::pos();
}

void CursorController::handleKey(int key)
{
    QPoint delta;
    switch (key) {
    case Qt::Key_Up:    delta = QPoint(0, -cfg.step); break;
    case Qt::Key_Down:  delta = QPoint(0,  cfg.step); break;
    case Qt::Key_Left:  delta = QPoint(-cfg.step, 0); break;
    case Qt::Key_Right: delta = QPoint( cfg.step, 0); break;
    case Qt::Key_Return:
    case Qt::Key_Space:
        if (cfg.emulate) emulateClick();
        return;
    default: return;
    }
    move(delta);
}

void CursorController::move(const QPoint &delta)
{
    QRect desk = QGuiApplication::primaryScreen()->geometry();
    m_pos += delta;

    if (cfg.wrap) {
        m_pos.setX(((m_pos.x() - desk.left()) % desk.width()  + desk.width())  % desk.width()  + desk.left());
        m_pos.setY(((m_pos.y() - desk.top())  % desk.height() + desk.height()) % desk.height() + desk.top());
    } else {
        m_pos.setX(qBound(desk.left()   + cfg.edgeGap, m_pos.x(), desk.right()  - cfg.edgeGap));
        m_pos.setY(qBound(desk.top()    + cfg.edgeGap, m_pos.y(), desk.bottom() - cfg.edgeGap));
    }

    if (m_useRealCursor)
        QCursor::setPos(m_pos);

    emit cursorMoved(m_pos);
}

void CursorController::emulateClick()
{
    QWidget *w = QApplication::widgetAt(m_pos);
    if (w) {
        QPoint local = w->mapFromGlobal(m_pos);
        QMouseEvent press (QEvent::MouseButtonPress,   local, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
        QMouseEvent release(QEvent::MouseButtonRelease, local, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
        QApplication::sendEvent(w, &press);
        QApplication::sendEvent(w, &release);
    }
    emit clicked(w);
}