const fs = require('fs');
const path = require('path');

const badgePath = path.join(__dirname, '..', 'assets', 'spine-badge.png');
let cachedDataUrl = null;

function dataUrl() {
	if (!cachedDataUrl) {
		cachedDataUrl = 'data:image/png;base64,' + fs.readFileSync(badgePath).toString('base64');
	}
	return cachedDataUrl;
}

function drawVersion(ctx, width, height, version) {
	version = String(version || '');
	if (version.length > 40 || !/^\d+\.\d+(?:\.\d+)?(?:[-+][a-z0-9][a-z0-9.-]*)?$/i.test(version)) return;
	const fontSize = Math.max(12, Math.round(Math.min(width, height) * 0.055));
	const margin = Math.max(10, Math.round(Math.min(width, height) * 0.03));
	ctx.save();
	try {
		ctx.font = '600 ' + fontSize + 'px sans-serif';
		ctx.textAlign = 'left'; ctx.textBaseline = 'middle';
		const boxHeight = fontSize + 12;
		const y = height - margin - boxHeight;
		ctx.fillStyle = 'rgba(0,0,0,0.65)';
		ctx.fillRect(margin, y, ctx.measureText(version).width + 16, boxHeight);
		ctx.fillStyle = '#ffffff'; ctx.fillText(version, margin + 8, y + boxHeight / 2);
	} finally { ctx.restore(); }
}

module.exports = { path: badgePath, dataUrl, drawVersion };