#!/usr/bin/env node
// For each npm package, prints its four newest major lines: first release,
// latest version and when that latest version was published. A line with no
// release for a long time has probably stopped receiving patches.
//
// Backs the version table in docs/GO-LIVE-PLAN.md §4. Re-run it before acting
// on that table — the numbers there are only true for the day they were taken.
//
//   node scripts/check-majors.mjs                # the packages the plan tracks
//   node scripts/check-majors.mjs vite pinia     # any packages
//
// Goes through the npm CLI rather than fetch() so the machine's registry or
// mirror settings (.npmrc) apply.
import { execSync } from 'node:child_process';

const TRACKED = [
  'vue', 'vite', '@vitejs/plugin-vue', 'vite-plugin-pwa', 'vue-router', 'pinia',
  'typescript', 'vue-tsc', 'tailwindcss', 'ant-design-vue', 'vant', '@vueuse/core',
  '@nestjs/core', 'prisma',
];
// Package names only — they are interpolated into a shell command.
const PACKAGE_NAME = /^(@[a-z0-9][\w.-]*\/)?[a-z0-9][\w.-]*$/i;
const STALE_AFTER_DAYS = 180;

const pkgs = process.argv.length > 2 ? process.argv.slice(2) : TRACKED;
const now = Date.now();

for (const pkg of pkgs) {
  if (!PACKAGE_NAME.test(pkg)) {
    console.log(`\n${pkg}: not a package name, skipped`);
    continue;
  }

  let published;
  try {
    published = JSON.parse(
      execSync(`npm view ${pkg} time --json`, {
        encoding: 'utf8',
        timeout: 60_000,
        stdio: ['ignore', 'pipe', 'ignore'],
      }),
    );
  } catch {
    console.log(`\n${pkg}: npm view failed`);
    continue;
  }

  const lines = new Map();
  for (const [version, date] of Object.entries(published)) {
    // Stable releases only; this also drops the `created` / `modified` keys.
    if (!/^\d+\.\d+\.\d+$/.test(version)) continue;
    const major = Number(version.split('.')[0]);
    const line = lines.get(major) ?? { firstVersion: version, first: date, lastVersion: version, last: date };
    if (date < line.first) Object.assign(line, { firstVersion: version, first: date });
    if (date > line.last) Object.assign(line, { lastVersion: version, last: date });
    lines.set(major, line);
  }

  console.log(`\n${pkg}`);
  const newestFirst = [...lines].sort(([a], [b]) => b - a).slice(0, 4);
  for (const [major, line] of newestFirst) {
    const idleDays = Math.floor((now - Date.parse(line.last)) / 86_400_000);
    const stale = idleDays > STALE_AFTER_DAYS ? `   <- no release for ${idleDays} days` : '';
    console.log(
      `  v${String(major).padEnd(3)} first ${line.firstVersion.padEnd(9)} ${line.first.slice(0, 10)}` +
        `   latest ${line.lastVersion.padEnd(9)} ${line.last.slice(0, 10)}${stale}`,
    );
  }
}