#!/usr/bin/env node
/**
 * v1.4.43 — write the active package.json version into
 * `public/sw-version.js`. The Service Worker (`public/sw.js`) loads
 * this file via `importScripts('/sw-version.js')` and reads
 * `self.__APP_VERSION__` to key its `CACHE_VERSION`.
 *
 * Pre-fix the SW carried a hand-bumped literal that drifted four
 * releases stale; the `activate`-step's old-cache eviction became
 * a no-op for every deploy in v1.4.38.4 → v1.4.42. Running this
 * script as a `prebuild` step re-anchors the version on every build,
 * so the eviction now fires reliably.
 *
 * Idempotent: writes the file unconditionally. Safe to commit the
 * generated file or `.gitignore` it — either way `pnpm build` reruns
 * the generator.
 */
import { readFileSync, writeFileSync } from "node:fs";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const repoRoot = join(__dirname, "..");
const pkgPath = join(repoRoot, "package.json");
const outPath = join(repoRoot, "public", "sw-version.js");
const swPath = join(repoRoot, "public", "sw.js");

const pkg = JSON.parse(readFileSync(pkgPath, "utf8"));
const version = `v${pkg.version}`;

const banner =
  "// AUTO-GENERATED by scripts/generate-sw-version.mjs — do not edit.\n";
const body = `self.__APP_VERSION__ = ${JSON.stringify(version)};\n`;

writeFileSync(outPath, banner + body, "utf8");

// Also re-anchor the in-`sw.js` fallback literal to the current version, so
// the literal used when `/sw-version.js` is missing (dev, or a 404 on the
// generated file) can never drift stale — it bit v1.4.38.4 → v1.4.42. The
// `/* @sw-version-fallback */` marker is the rewrite anchor; the literal that
// follows it is replaced in place. If the marker is gone the SW source has
// been restructured and the build must surface that rather than silently skip
// the re-anchor.
const sw = readFileSync(swPath, "utf8");
const fallbackPattern = /(\/\* @sw-version-fallback \*\/\s*)"v[^"]*"/;
if (!fallbackPattern.test(sw)) {
  process.stderr.write(
    "generate-sw-version: @sw-version-fallback marker not found in public/sw.js\n",
  );
  process.exit(1);
}
const rewritten = sw.replace(fallbackPattern, `$1${JSON.stringify(version)}`);
if (rewritten !== sw) writeFileSync(swPath, rewritten, "utf8");

// One-line log so the build output shows the version we baked in.
process.stdout.write(
  `sw-version.js → ${version} (sw.js fallback re-anchored)\n`,
);