const fs = require("fs"),
  path = require("path"),
  crypto = require("crypto");

const site = process.argv[2];
if (!site) {
  console.error("usage: node scripts/publish.js <path-to-jekyll-site>");
  process.exit(1);
}

const dist = path.join(__dirname, "..", "dist");
const dest = path.join(site, "assets", "cm");
const jsFiles = fs
  .readdirSync(dist)
  .filter((f) => f.endsWith(".js"))
  .sort();

// version = hash of the bundle contents, so it only changes when the code does
const h = crypto.createHash("sha1");
for (const f of jsFiles) h.update(fs.readFileSync(path.join(dist, f)));
const v = h.digest("hex").slice(0, 10);

// replace old files so stale chunks don't pile up
fs.rmSync(dest, { recursive: true, force: true });
fs.mkdirSync(dest, { recursive: true });
for (const f of fs.readdirSync(dist))
  fs.copyFileSync(path.join(dist, f), path.join(dest, f));

const entries = {
  "@codemirror/state": "state",
  "@codemirror/view": "view",
  "@codemirror/commands": "commands",
  "@codemirror/language": "language",
  "@uiw/codemirror-theme-github": "theme",
};
const imports = Object.entries(entries)
  .map(
    ([spec, name]) =>
      `      "${spec}": "{{ '/assets/cm/${name}.js' | relative_url }}?v=${v}"`,
  )
  .join(",\n");
const preload = jsFiles
  .filter((f) => f.startsWith("chunk-"))
  .map(
    (f) => `<link
  rel="modulepreload"
  href="{{ '/assets/cm/${f}' | relative_url }}"
/>`,
  )
  .join("\n");

const html = `${preload}\n<script type="importmap">\n  {\n    "imports": {\n${imports}\n    }\n  }\n</script>\n`;
fs.mkdirSync(path.join(site, "_includes"), { recursive: true });
fs.writeFileSync(path.join(site, "_includes", "cm-importmap.html"), html);
console.log("published, version", v);