// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "parallelitem.h"
#include "scxmldocument.h"
#include "scxmltagutils.h"
#include <QPainter>

using namespace ScxmlEditor::PluginInterface;

ParallelItem::ParallelItem(const QPointF &pos, BaseItem *parent)
    : StateItem(pos, parent)
{
    m_pixmap = QPixmap(":/scxmleditor/images/parallel_icon.png");
    updatePolygon();
}

void ParallelItem::updatePolygon()
{
    StateItem::updatePolygon();
    int cap = m_titleRect.height() * 0.2;
    m_pixmapRect = m_titleRect.adjusted(m_titleRect.width() - m_titleRect.height(), cap, -cap, -cap).toRect();
}

void ParallelItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    StateItem::paint(painter, option, widget);

    painter->save();
    painter->setRenderHint(QPainter::Antialiasing, true);
    painter->setOpacity(getOpacity());

    painter->drawPixmap(m_pixmapRect, m_pixmap);
    painter->restore();
}

void ParallelItem::doLayout(int d)
{
    if (depth() != d)
        return;

    // 1. Find children items
    QVector<StateItem*> children;
    const QList<QGraphicsItem *> items = childItems();
    for (QGraphicsItem *it : items) {
        if (it->type() >= StateType) {
            auto itt = qgraphicsitem_cast<StateItem*>(it);
            if (itt)
                children << itt;
        }
    }

    // 2. Adjust sizes
    for (StateItem *itt : std::as_const(children))
        itt->shrink();

    qreal maxw = 0;
    for (StateItem *itt : std::as_const(children)) {
        QRectF rr = itt->boundingRect();
        maxw = qMax(rr.width(), maxw);
    }

    for (StateItem *itt : std::as_const(children)) {
        QRectF rr = itt->boundingRect();
        if (!qFuzzyCompare(rr.width(), maxw))
            rr.setWidth(maxw);
        itt->setItemBoundingRect(rr);
    }

    // 3. Relocate children-states
    // a) sort list
    QVector<StateItem*> sortedList;
    while (!children.isEmpty()) {
        qreal minTop = children.first()->boundingRect().top();
        int minTopIndex = 0;
        for (int i = 1; i < children.count(); ++i) {
            qreal top = children[i]->boundingRect().top();
            if (top < minTop) {
                minTop = top;
                minTopIndex = i;
            }
        }
        sortedList << children.takeAt(minTopIndex);
    }

    // b) relocate items
    for (int i = 1; i < sortedList.count(); ++i) {
        QRectF br1 = sortedList[i - 1]->sceneBoundingRect();
        QRectF br2 = sortedList[i]->sceneBoundingRect();
        sortedList[i]->moveStateBy(br1.left() - br2.left(), br1.bottom() + 10 - br2.top());
    }

    // 4. Shrink parallel-state
    shrink();
}