/**
 * SVG -> PNG 批量转换 (resvg, 支持中文系统字体)
 *
 *   npm install          # 首次安装依赖
 *   node tools/svg2png.js            # 转换 docs/assets 下全部 svg
 *   node tools/svg2png.js foo.svg    # 只转换指定文件
 */
const fs = require("fs");
const path = require("path");

let Resvg;
try {
  ({ Resvg } = require("@resvg/resvg-js"));
} catch (e) {
  console.error("缺少依赖 @resvg/resvg-js，请先执行: npm install");
  process.exit(1);
}

const dir = path.join(__dirname, "..", "docs", "assets");
const args = process.argv.slice(2);
const files = args.length
  ? args
  : fs.readdirSync(dir).filter((f) => f.toLowerCase().endsWith(".svg"));

let ok = 0;
for (const f of files) {
  const src = path.join(dir, f);
  const dst = src.replace(/\.svg$/i, ".png");
  const svg = fs.readFileSync(src, "utf8");
  const r = new Resvg(svg, {
    fitTo: { mode: "zoom", value: 2 },
    font: { loadSystemFonts: true },
    background: "#0d1117",
  });
  fs.writeFileSync(dst, r.render().asPng());
  console.log(`  ${f} -> ${path.basename(dst)}`);
  ok++;
}
console.log(`converted ${ok} file(s)`);