import { readFile, writeFile, mkdir, copyFile, rename, rm } from 'node:fs/promises';
import { createHash } from 'node:crypto';
import { parseArgs } from 'node:util';
import path from 'node:path';
import { root, output } from './suite.mjs';
import { appendRelease, artifactPath } from './release-catalog.mjs';

const { values } = parseArgs({ options: {
  'base-url': { type: 'string' },
  catalog: { type: 'string', default: 'source' },
} });
if (!values['base-url']) throw new Error('Usage: pnpm run release:prepare --base-url https://downloads.example/source/');
const base = new URL(values['base-url']);
if (base.protocol !== 'https:' || base.username || base.password || base.search || base.hash) {
  throw new Error('Publication base must be an HTTPS directory URL without credentials, query or fragment');
}
if (!base.pathname.endsWith('/')) base.pathname += '/';
const catalogDirectory = path.resolve(root, values.catalog);
const publishDirectory = path.join(output, 'release');
const timestamp = new Date().toISOString();
const specifications = [
  { file: 'index.json', id: 'trove-official', name: 'Trove 官方软件源' },
];
const catalogs = new Map();
for (const spec of specifications) {
  let index;
  try { index = JSON.parse(await readFile(path.join(catalogDirectory, spec.file), 'utf8')); }
  catch (error) {
    if (error.code !== 'ENOENT') throw error;
    index = { schemaVersion: 1, id: spec.id, name: spec.name, generatedAt: timestamp, curios: [] };
  }
  if (index.id !== spec.id || index.schemaVersion !== 1 || !Array.isArray(index.curios)) throw new Error(`Unexpected catalog identity: ${spec.file}`);
  catalogs.set(spec.file, index);
}
const entries = JSON.parse(await readFile(path.join(output, 'suite.json'), 'utf8'));
const files = [];
// Validate every proposed addition before changing any catalog or copying artifacts.
for (const entry of entries) {
  if (entry.fault) continue;
  const bytes = await readFile(entry.file);
  const sha256 = createHash('sha256').update(bytes).digest('hex');
  if (sha256 !== entry.artifact.sha256 || bytes.length !== entry.artifact.size) throw new Error(`Build metadata doesn't match ${entry.file}; run pack again`);
  const relative = artifactPath(entry.manifest, entry.artifact.target);
  const url = new URL(relative.split('/').map(encodeURIComponent).join('/'), base).href;
  const spec = specifications[0];
  const artifact = { ...entry.artifact, url };
  catalogs.set(spec.file, appendRelease(catalogs.get(spec.file), entry.manifest, artifact, timestamp));
  files.push({ from: entry.file, relative, sha256, size: bytes.length, url });
}
// Only the current approved publication plan belongs in the generated upload directory.
await rm(publishDirectory, { recursive: true, force: true });
for (const file of files) {
  const destination = path.join(publishDirectory, file.relative);
  await mkdir(path.dirname(destination), { recursive: true });
  await copyFile(file.from, destination);
}
await mkdir(catalogDirectory, { recursive: true });
await mkdir(publishDirectory, { recursive: true });
for (const [file, index] of catalogs) {
  const text = JSON.stringify(index, null, 2) + '\n';
  await writeFile(path.join(publishDirectory, file), text);
  const temporary = path.join(catalogDirectory, `${file}.tmp`);
  await writeFile(temporary, text);
  await rename(temporary, path.join(catalogDirectory, file));
}
await writeFile(path.join(publishDirectory, 'upload-plan.json'), JSON.stringify({ baseUrl: base.href, files }, null, 2) + '\n');
console.log(`Prepared ${files.length} immutable artifacts in ${publishDirectory}`);
console.log(`Catalog history: ${catalogDirectory}`);
console.log('Next: upload package files without overwrite, verify remote bytes, then atomically publish index.json.');