/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { execFileSync } from 'node:child_process';
import { createHash } from 'node:crypto';
import { readdirSync, readFileSync, writeFileSync } from 'node:fs';
import { dirname, join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';

const repoRoot = dirname(dirname(fileURLToPath(import.meta.url)));
const manifestPath = join(repoRoot, 'experiments', 'windows-sandbox', 'launcher', 'Cargo.toml');
const lockPath = join(repoRoot, 'experiments', 'windows-sandbox', 'launcher', 'Cargo.lock');
const outputPath = join(
  repoRoot,
  'apps',
  'desktop',
  'resources',
  'licenses',
  'cargo',
  'THIRD_PARTY_NOTICES.txt',
);
const check = process.argv.includes('--check');

const metadata = JSON.parse(
  execFileSync(
    process.env.CARGO ?? 'cargo',
    ['metadata', '--manifest-path', manifestPath, '--locked', '--format-version', '1'],
    { cwd: repoRoot, encoding: 'utf8' },
  ),
);

const packages = metadata.packages
  .filter((pkg) => pkg.name !== 'maka-windows-sandbox-spike')
  .sort((left, right) =>
    Buffer.compare(
      Buffer.from(`${left.name}@${left.version}`, 'utf8'),
      Buffer.from(`${right.name}@${right.version}`, 'utf8'),
    ),
  );

const sections = packages.map((pkg) => {
  if (!pkg.license) throw new Error(`${pkg.name}@${pkg.version}: missing SPDX license metadata`);
  const directory = dirname(pkg.manifest_path);
  const licenseFiles = readdirSync(directory, { withFileTypes: true })
    .filter(
      (entry) => entry.isFile() && /^(licen[cs]e|copying|notice)(?:[._-].*)?$/iu.test(entry.name),
    )
    .map((entry) => entry.name)
    .sort();
  if (licenseFiles.length === 0) {
    throw new Error(`${pkg.name}@${pkg.version}: packaged crate has no license or notice text`);
  }
  const source = pkg.repository ?? pkg.homepage ?? pkg.source ?? 'unknown';
  const heading = `${pkg.name} ${pkg.version}`;
  return [
    heading,
    '-'.repeat(heading.length),
    `SPDX license: ${pkg.license}`,
    `Source: ${source}`,
    ...licenseFiles.flatMap((name) => [
      '',
      `--- ${name} ---`,
      readFileSync(join(directory, name), 'utf8').replace(/\r\n?/gu, '\n').trimEnd(),
    ]),
  ].join('\n');
});

const lockDigest = createHash('sha256').update(readFileSync(lockPath)).digest('hex');
const output = `Maka Windows sandbox Cargo dependency notices
================================================

Generated by scripts/generate-windows-cargo-notices.mjs from the exact
Cargo.lock dependency graph. Do not edit this file by hand.

Manifest: ${relative(repoRoot, manifestPath).replaceAll('\\', '/')}
Cargo.lock SHA-256: ${lockDigest}

${sections.join('\n\n')}
`;

if (check) {
  const existing = readFileSync(outputPath, 'utf8');
  if (existing !== output) {
    throw new Error(
      'Windows Cargo dependency notices are stale. Run npm run generate:windows-cargo-notices.',
    );
  }
  console.log('[windows-cargo-notices] OK — Cargo dependency inventory is current.');
} else {
  writeFileSync(outputPath, output);
  console.log(`[windows-cargo-notices] wrote ${outputPath}`);
}