#include "tgtsmlplatforminputcontext.h"
#include <QCoreApplication>
#include <QKeyEvent>
#include <QApplication>
#include <QDesktopWidget>

TgtsmlPlatformInputContext::TgtsmlPlatformInputContext()
{
    m_focusitem = nullptr;
    m_keyboard = nullptr;
}

TgtsmlPlatformInputContext::~TgtsmlPlatformInputContext()
{
    disconnect(m_keyboard, &KeyboardForm::sendKeyToFocusItem, this, &TgtsmlPlatformInputContext::sendKeyToFocusItem);
    if(m_keyboard) delete m_keyboard;
}

void TgtsmlPlatformInputContext::sendKeyToFocusItem(const QString &keytext)
{
    if(!m_focusitem)return;

    if(keytext == QString("\x7F"))     //Backspace <--
    {
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyPress, Qt::Key_Backspace, Qt::NoModifier));
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyRelease, Qt::Key_Backspace, Qt::NoModifier));
    }
    else if(keytext == QString("\n"))
    {
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier));
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyRelease, Qt::Key_Return, Qt::NoModifier));
    }
    else if(keytext == QString("&&"))
    {
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyPress, 0, Qt::NoModifier, "&"));
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyRelease, 0, Qt::NoModifier, "&"));
    }
    else
    {
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyPress, 0, Qt::NoModifier, keytext));
        QCoreApplication::sendEvent(m_focusitem, new QKeyEvent(QEvent::KeyRelease, 0, Qt::NoModifier, keytext));
    }
}

bool TgtsmlPlatformInputContext::isValid() const
{
    return true;
}

void TgtsmlPlatformInputContext::setFocusObject(QObject *object)
{
    m_focusitem = object;
}

void TgtsmlPlatformInputContext::showInputPanel()
{
    if(!m_keyboard){
        m_keyboard = new KeyboardForm;
        connect(m_keyboard, &KeyboardForm::sendKeyToFocusItem, this, &TgtsmlPlatformInputContext::sendKeyToFocusItem);
    }
    if(m_keyboard->isHidden())m_keyboard->show();
    QWidget *widgetTmp = qobject_cast<QWidget*>(m_focusitem);
    if(widgetTmp){
        QPoint widgetGlobalPos = widgetTmp->mapToGlobal(QPoint(0, 0));
        if(widgetGlobalPos.x() < 0){
            widgetGlobalPos.setX(0);
        }
        if(widgetGlobalPos.y() < 0){
            widgetGlobalPos.setY(0);
        }
        if(qApp->desktop()->width() - widgetGlobalPos.x() < m_keyboard->width()){
            widgetGlobalPos.setX(qApp->desktop()->width() - m_keyboard->width());
        }
        if(qApp->desktop()->height() - widgetGlobalPos.y() - 30 < m_keyboard->height()){
            widgetGlobalPos.setY(widgetGlobalPos.y() - m_keyboard->height() - 10);
        }
        else{
             widgetGlobalPos = widgetGlobalPos + QPoint(0,30);
        }
        m_keyboard->move(widgetGlobalPos);
    }
}

void TgtsmlPlatformInputContext::hideInputPanel()
{
    if(!m_keyboard){
        return;
    }
    if(!m_keyboard->isHidden()){
        m_keyboard->hide();
    }
    m_keyboard->clearChineseCache();
}

bool TgtsmlPlatformInputContext::isInputPanelVisible() const
{
    return m_keyboard->isVisible();
}