#!/usr/bin/env node
/**
 * Replace the __BUILD_VERSION__ placeholder in the built sw.js with a
 * deterministic version string : the short git SHA + the build timestamp.
 *
 * Why : the service worker uses CACHE_VERSION to namespace caches and
 * prune stale ones at activate. If __BUILD_VERSION__ stays literal,
 * every deploy ships the same `veza-platform-__BUILD_VERSION__` cache
 * name and pre-existing browser caches never get invalidated.
 *
 * v1.0.9 W4 Day 16.
 */

import { readFile, writeFile } from 'node:fs/promises';
import { execSync } from 'node:child_process';
import { resolve } from 'node:path';

async function main() {
  const target = process.env.SW_PATH || resolve(process.cwd(), 'dist/sw.js');

  let sha = 'dev';
  try {
    sha = execSync('git rev-parse --short HEAD', { stdio: ['pipe', 'pipe', 'ignore'] })
      .toString()
      .trim();
  } catch {
    // Not a git checkout (e.g. CI building a tarball) — fall back to env var.
    sha = process.env.GITHUB_SHA?.slice(0, 7) || process.env.CI_COMMIT_SHA?.slice(0, 7) || 'dev';
  }

  const ts = new Date().toISOString().replace(/[-:.TZ]/g, '').slice(0, 12); // YYYYMMDDHHMM
  const version = `${ts}-${sha}`;

  let content;
  try {
    content = await readFile(target, 'utf8');
  } catch (err) {
    if (err.code === 'ENOENT') {
      console.warn(`[stamp-sw-version] ${target} not found — skipping (run vite build first).`);
      return;
    }
    throw err;
  }

  if (!content.includes('__BUILD_VERSION__')) {
    console.warn(
      `[stamp-sw-version] no __BUILD_VERSION__ placeholder in ${target} — already stamped or sw.js was rewritten without one.`,
    );
    return;
  }

  const stamped = content.replaceAll('__BUILD_VERSION__', version);
  await writeFile(target, stamped, 'utf8');
  console.log(`[stamp-sw-version] sw.js stamped with ${version}`);
}

main().catch((err) => {
  console.error('[stamp-sw-version] failed:', err);
  process.exit(1);
});