// Copyright Carl Philipp Klemm 2026
// SPDX-License-Identifier: GPL-3.0-or-later

#include "elidedlabel.h"

#include <QTextLayout>
#include <QPainter>

ElidedLabel::ElidedLabel(const QString &text, QWidget *parent)
	: QFrame(parent)
	, elided(false)
	, content(text)
{
	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
}

ElidedLabel::ElidedLabel(QWidget *parent)
	: QFrame(parent)
	, elided(false)
	, content("")
{
	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
}

void ElidedLabel::setText(const QString &newText)
{
	content = newText;
	update();
}

void ElidedLabel::paintEvent(QPaintEvent *event)
{
	QFrame::paintEvent(event);

	QPainter painter(this);
	QFontMetrics fontMetrics = painter.fontMetrics();

	bool didElide = false;
	int lineSpacing = fontMetrics.lineSpacing();
	int y = 0;

	QTextLayout textLayout(content, painter.font());
	textLayout.beginLayout();
	forever {
		QTextLine line = textLayout.createLine();

		if (!line.isValid())
			break;

		line.setLineWidth(width());
		int nextLineY = y + lineSpacing;

		if (height() >= nextLineY + lineSpacing) {
			line.draw(&painter, QPoint(0, y));
			y = nextLineY;
			//! [2]
			//! [3]
		} else {
			QString lastLine = content.mid(line.textStart());
			QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
			painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
			line = textLayout.createLine();
			didElide = line.isValid();
			break;
		}
	}
	textLayout.endLayout();

	if (didElide != elided) {
		elided = didElide;
		emit elisionChanged(didElide);
	}
}