#include "UnitDelegate.h"
#include <QPainter>

BasicUnitDelegate::BasicUnitDelegate(QObject* parent /*= nullptr*/)
	:UnitPresentDelegate(parent) {
}

int BasicUnitDelegate::unitType() const
{
	return 0;
}

void BasicUnitDelegate::paint(QPainter* p, const PresentOption& option)
{
	p->setRenderHint(QPainter::Antialiasing, true);

	auto rect = option.outline;
	auto center = rect.center();
	auto alen = rect.width() / 2;
	const float xspan = alen * sqrt(3) / 2;

	QRadialGradient brush(center, alen);
	brush.setColorAt(0, Qt::gray);
	brush.setColorAt(1, Qt::white);
	p->setBrush(brush);
	p->drawRect(rect);

	if (_hot_index == option.index) {
		auto pen = p->pen();
		pen.setColor(Qt::red);
		pen.setWidth(10);
		p->setPen(pen);
		auto pathx = clipPathGet(rect);
		p->drawPath(pathx);
	}

	auto ft = p->font();
	ft.setPixelSize(alen * 0.3);
	p->setFont(ft);

	p->setPen(Qt::black);
	auto text_rect = QRectF(center.x() - xspan, center.y() - alen / 2, xspan * 2, alen);
	auto text_str = QString("(%1,%2)").arg(option.index.row).arg(option.index.col);
	p->drawText(text_rect, Qt::AlignCenter, text_str);
}

QPainterPath BasicUnitDelegate::clipPathGet(const QRectF& rect)
{
	auto center = rect.center();
	auto alen = rect.width() / 2;
	const float xspan = alen * sqrt(3) / 2;

	QList<QPointF> points;
	points << QPointF(center.x() - xspan, center.y() - alen / 2);
	points << QPointF(center.x(), 0);
	points << QPointF(center.x() + xspan, center.y() - alen / 2);
	points << QPointF(center.x() + xspan, center.y() + alen / 2);
	points << QPointF(center.x(), rect.height());
	points << QPointF(center.x() - xspan, center.y() + alen / 2);
	points << QPointF(center.x() - xspan, center.y() - alen / 2);

	QPainterPath clicp_path;
	clicp_path.moveTo(points.first());
	for (auto idx = 0; idx < points.size(); ++idx) {
		clicp_path.lineTo(points[idx]);
	}
	return clicp_path;
}

void BasicUnitDelegate::hotClear()
{
	auto prev_idx = _hot_index;
	_hot_index = PresentIndex();

	emit this->updateRequest({ prev_idx });
}

void BasicUnitDelegate::hotIndexSet(const PresentIndex& idx)
{
	if (_hot_index != idx) {
		auto prev_idx = _hot_index;
		_hot_index = idx;

		emit this->updateRequest({ prev_idx });
		emit this->updateRequest({ idx });
	}
}