#include "tagscene.h"

#include <QGraphicsSceneMouseEvent>

void TagScene::setProject(SQLiteSaveFile *proj) {
    if (m_proj)
        disconnect(m_proj, nullptr, this, nullptr);
    m_proj = proj;

    reloadScene();

    connect(m_proj, &SQLiteSaveFile::tagChange, this, &TagScene::tagChanged);
    connect(m_proj, &SQLiteSaveFile::fileReload, this, &TagScene::reloadScene);
    connect(m_proj, &SQLiteSaveFile::imageLoaded, this, &TagScene::reloadPicture);
}

void TagScene::tagChanged(TagChange change, const Tag &tag)
{
    TagItem *it;

    switch(change)
    {
    case TagChange::CREATED:
        addTag(tag);
        break;

    case TagChange::DELETED:
        it = tags.take(tag.id);
        assert(it);
        removeItem(it);
        break;

    case TagChange::CHANGED:
        it = tags[tag.id];
        assert(it);

        it->tagUpdated(tag);
        break;
    }
}

void TagScene::reloadPicture()
{
    if (!m_proj)
        return;

    pix.loadFromData(m_proj->getImage());
    if (pix_it)
        removeItem(pix_it);
    pix_it = new QGraphicsPixmapItem(pix);
    pix_it->setZValue(-1);
    addItem(pix_it);
    QRectF imgBounds = pix_it->boundingRect();
    imgBounds = imgBounds.marginsAdded(QMargins(imgBounds.width() * 0.5, imgBounds.height() * 0.5, imgBounds.width() * 0.5, imgBounds.height() * 0.5));
    setSceneRect(itemsBoundingRect().united(imgBounds));
    qDebug() << "TagScene: reloadPicture()" << pix_it->boundingRect() << pix_it << pix << pix_it->isActive();

    invalidate();
    imageLoaded();
}

void TagScene::addTag(const Tag tag) {
    TagItem *it = new TagItem(tag);
    addItem(it);
    tags[tag.id] = it;
}

void TagScene::reloadScene()
{
    clear();
    for (auto *it : tags.values())
        delete it;
    pix_it = nullptr;

    if (!m_proj)
        return;

    for (const Tag &tag : m_proj->getAllTags())
        addTag(tag);

    reloadPicture(); /* calls invalidate() for us */
}

void TagScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    QGraphicsItem *it = itemAt(event->scenePos(), QTransform());
    if (!it) {
        QGraphicsScene::mouseDoubleClickEvent(event);
        return;
    }

    if (it == pix_it) {
        m_proj->createTagAt(event->scenePos());
        return;
    }

    TagItem *tagitem = qgraphicsitem_cast<TagItem *>(it);
    if (!tagitem) {
        QGraphicsScene::mouseDoubleClickEvent(event);
        return;
    }

    tagDoubleClicked(tagitem->tag());
}