#!/usr/bin/env node
// Generates the website download manifest (manifest.json) from a directory of
// downloaded release assets. Consumed by ccswitch.io/download. The manifest
// schema is mirrored in cc-switch-website/src/lib/downloads.ts — keep both in
// sync when changing fields or classification rules.
//
// Usage: node scripts/generate-download-manifest.mjs <assets-dir> <tag> <base-url> [output]

import { readdirSync, statSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';

const [assetsDir, tag, baseUrl, output = 'manifest.json'] = process.argv.slice(2);

if (!assetsDir || !tag || !baseUrl) {
  console.error('Usage: node scripts/generate-download-manifest.mjs <assets-dir> <tag> <base-url> [output]');
  process.exit(1);
}

// Longer suffixes must come before their shorter counterparts
// (e.g. -Windows-arm64.msi before -Windows.msi).
const RULES = [
  { suffix: '-macOS.dmg', platform: 'macos', kind: 'dmg', arch: 'universal' },
  { suffix: '-macOS.zip', platform: 'macos', kind: 'zip', arch: 'universal' },
  { suffix: '-Windows-arm64-Portable.zip', platform: 'windows', kind: 'portable', arch: 'arm64' },
  { suffix: '-Windows-Portable.zip', platform: 'windows', kind: 'portable', arch: 'x64' },
  { suffix: '-Windows-arm64.msi', platform: 'windows', kind: 'msi', arch: 'arm64' },
  { suffix: '-Windows.msi', platform: 'windows', kind: 'msi', arch: 'x64' },
  { suffix: '-Linux-arm64.AppImage', platform: 'linux', kind: 'appimage', arch: 'arm64' },
  { suffix: '-Linux-x86_64.AppImage', platform: 'linux', kind: 'appimage', arch: 'x64' },
  { suffix: '-Linux-arm64.deb', platform: 'linux', kind: 'deb', arch: 'arm64' },
  { suffix: '-Linux-x86_64.deb', platform: 'linux', kind: 'deb', arch: 'x64' },
  { suffix: '-Linux-arm64.rpm', platform: 'linux', kind: 'rpm', arch: 'arm64' },
  { suffix: '-Linux-x86_64.rpm', platform: 'linux', kind: 'rpm', arch: 'x64' },
];

const normalizedBase = baseUrl.replace(/\/+$/, '');
const files = [];

for (const name of readdirSync(assetsDir).sort()) {
  // Unmatched files (.sig, .tar.gz updater artifacts, latest.json) are
  // deliberately skipped — they are not user-facing downloads.
  const rule = RULES.find((entry) => name.endsWith(entry.suffix));
  if (!rule) continue;
  files.push({
    platform: rule.platform,
    kind: rule.kind,
    arch: rule.arch,
    name,
    size: statSync(join(assetsDir, name)).size,
    url: `${normalizedBase}/${tag}/${encodeURIComponent(name)}`,
  });
}

if (files.length === 0) {
  console.error(`No release assets matched in ${assetsDir}`);
  process.exit(1);
}

const manifest = {
  version: tag.replace(/^v/, ''),
  tag,
  pubDate: new Date().toISOString(),
  files,
};

writeFileSync(output, `${JSON.stringify(manifest, null, 2)}\n`);
console.log(`Wrote ${output} with ${files.length} files for ${tag}`);