#include "HoverInfo.h"

#include "../base/Plot.h"

namespace YSG {
    void HoverInfoRenderState::drawHover(QPainter* painter, AbsAxis* h, AbsAxis* v) {
        QPoint pos = hoverInfoPos;
        if(!renderAble) {
            auto that = dynamic_cast<RenderState*>(this);
            renderAble = dynamic_cast<HoverInfoRenderAbleInterFace*>(that->dPtr->qPtr);
        }
        QVector<QString> lines = renderAble->createHoverString(h, v, pos);
        QFontMetrics fm(hoverInfoFont);
        int width = std::numeric_limits<int>::min();
        for(QString& s : lines) width = qMax(width, fm.horizontalAdvance(s));
        QRect r = QRect(pos.x() + hoverInfoLeft, pos.y() + hoverInfoTop,
        (int)width  + hoverInfoRight + hoverInfoLeft, fm.height() * lines.size() + hoverInfoBottom);
        painter->fillRect(r, hoverInfoBrush);
        painter->setPen(hoverInfoPen);
        painter->setFont(hoverInfoFont);
        int lineHeight = fm.height();
        for (int i = 0; i < lines.size(); ++i) {
            QRect lineRect(r.left(), r.top() + i * lineHeight, r.width(), lineHeight);
            painter->drawText(lineRect, Qt::AlignCenter, lines[i]);
        }
    }

    bool HoverInfoRenderState::hoverOK(RenderAble* able) const {
        auto tmp = dynamic_cast<HoverInfoRenderAbleInterFace*>(able);
        return useHoverInfo && hoverInfoActive && tmp->hoverTest(hoverInfoPos);
    }

    QVector<QString> HoverInfoRenderAbleInterFace::createHoverString(AbsAxis* h, AbsAxis* v, QPoint pos) {
        double tick1 = h->pixelToCoord(pos.x(), SRC::Render);
        double tick2 = v->pixelToCoord(pos.y(), SRC::Render);
        QString line1 = h->getTickLabel(tick1, SRC::Render) + h->unitText();
        QString line2 = v->getTickLabel(tick2, SRC::Render) + v->unitText();
        return {line1, line2};
    }
}