#include "dragimageitem.h"

#include <QCursor>
#include <QGuiApplication>
#include <QMimeData>
#include <QPainter>
#include <QQuickWindow>
#include <QTimer>

DragImageItem::DragImageItem(QQuickItem *parent) : QQuickPaintedItem(parent)
{
    setWidth(64.0);
    setHeight(64.0);
    setZ(10000);
    setVisible(false);
    qGuiApp->installEventFilter(this);
}

QString DragImageItem::imageUrl() const
{
    return m_imageUrl;
}

void DragImageItem::setImageUrl(QString imageUrl)
{
    if (m_imageUrl == imageUrl || imageUrl.isEmpty())
        return;
    m_imageUrl = imageUrl;
    if (m_imageUrl.startsWith("qrc:"))
        m_imageUrl.remove(0, 3);
    m_image.load(m_imageUrl);
    m_image = m_image.scaled(width(), height(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
    emit imageUrlChanged(m_imageUrl);
    update();
}

void DragImageItem::paint(QPainter *p)
{
    p->drawImage(QRectF(0, 0, width(), height()), m_image);
}

bool DragImageItem::eventFilter(QObject *watched, QEvent *event)
{
    if (event->type() == QEvent::DragMove || event->type() == QEvent::MouseMove
        || event->type() == QEvent::Move) {
        setToCursorPos();
    }

    if (event->type() == QEvent::DragEnter) {
        auto *dragEnterEvent = static_cast<QDragEnterEvent *>(event);
        setImageUrl(dragEnterEvent->mimeData()->data("imageSource"));
        setToCursorPos();
        setVisible(true);
    } else if (event->type() == QEvent::DragLeave || event->type() == QEvent::Drop) {
        setVisible(false);
    }

    return QObject::eventFilter(watched, event);
}

void DragImageItem::setToCursorPos()
{
    QPoint globalCursorPos = QCursor::pos();

    QPointF origin(0, 0);
    auto *p = this->parentItem();
    while (p) {
        origin += QPointF(p->x(), p->y());
        p = p->parentItem();
    }

    auto pos = globalCursorPos - QPointF(this->window()->x(), this->window()->y()) - origin;
    setX(pos.x());
    setY(pos.y());
}