import { createHash } from 'node:crypto';
import { mkdirSync, writeFileSync, readFileSync, readdirSync } from 'node:fs';
import { execFileSync } from 'node:child_process';
import { createRequire } from 'node:module';
import { patchClient } from './patch-chat-manager.mjs';

const root = '/usr/local/lib/dsh-mgr';
const version = '1.5.20';
const patchedVersion = '1.5.20-dsh-mgr.1';
const hostManifest = '/usr/local/lib/node_modules/@deepseek-ai/dsh/package.json';
const destination = '/usr/local/lib/node_modules/@deepseek-ai/dsh/node_modules/dsh-chat-manager';
const packages = [
  ['dsh-chat-manager', version, 'https://registry.npmjs.org/dsh-chat-manager/-/dsh-chat-manager-1.5.20.tgz', 'V/7N48lJioxBr2h+hmVnNoZB5jjoT/EGC6Pk8pSbNJveQoHye+zBj3tUX1Xf520YyopVk5fSVpt+aeCkBBVxdA=='],
  ['clsx', '2.1.1', 'https://registry.npmjs.org/clsx/-/clsx-2.1.1.tgz', 'eYm0QWBtUrBWZWG0d386OGAw16Z995PiOVo2B7bjWSbHedGl5e0ZWaq65kOGgUSNesEIDkB9ISbTg/JK9dhCZA=='],
];
mkdirSync(root, { recursive: true });
for (const [name, release, url, integrity] of packages) {
  const response = await fetch(url, { signal: AbortSignal.timeout(120000) });
  if (!response.ok) throw new Error('download failed: ' + name);
  const data = Buffer.from(await response.arrayBuffer());
  if (createHash('sha512').update(data).digest('base64') !== integrity) throw new Error('integrity mismatch: ' + name);
  writeFileSync(`${root}/${name}-${release}.tgz`, data, { mode: 0o644 });
}
mkdirSync(destination, { recursive: true });
execFileSync('tar', ['-xzf', `${root}/dsh-chat-manager-${version}.tgz`, '--strip-components=1', '--no-same-owner', '-C', destination]);
const pkg = JSON.parse(readFileSync(destination + '/package.json'));
if (pkg.name !== 'dsh-chat-manager' || pkg.version !== version || pkg.license !== 'MIT' || JSON.stringify(pkg.dependencies) !== JSON.stringify({ clsx: '^2.0.0' })) throw new Error('unexpected chat-manager metadata');
if (!readFileSync(destination + '/LICENSE', 'utf8').includes('MIT License')) throw new Error('missing chat-manager MIT license');
const require = createRequire(hostManifest);
const host = JSON.parse(readFileSync(hostManifest));
const semver = createRequire('/usr/local/lib/node_modules/npm/package.json')('semver');
for (const [name, range] of Object.entries(pkg.peerDependencies || {})) {
  // 1.5.20 retains this optional legacy peer but its runtime no longer imports it.
  if (name === '@deepseek-ai/dsh-invariants' && pkg.peerDependenciesMeta?.[name]?.optional) {
    for (const file of ['src/index.js', 'src/host/archive-manager.mjs', 'src/host/delete-session.mjs', 'lib/client.js']) {
      if (readFileSync(destination + '/' + file, 'utf8').includes(name)) throw new Error('legacy invariants peer is used again');
    }
    continue;
  }
  if (name === 'react') {
    if (host.version !== '0.2.1-rc.5') throw new Error('unverified browser React host: ' + host.version);
    continue;
  }
  // New web hosts bundle this pure UI module in the browser bootstrap.
  if (['@deepseek-ai/dsh-client-ui-primitives', '@deepseek-ai/dsh-client-ui-slots'].includes(name) && host.version === '0.2.1-rc.5') {
    const frontend = require.resolve('@deepseek-ai/dsh-web-frontend/package.json');
    const assets = frontend.slice(0, -'package.json'.length) + 'dist/assets';
    const frontendVersion = JSON.parse(readFileSync(frontend)).version;
    if (frontendVersion !== host.version || !semver.satisfies(frontendVersion, range) || !readdirSync(assets).filter(file => /^index-.*\.js$/.test(file)).some(file => readFileSync(assets + '/' + file, 'utf8').includes(JSON.stringify(name) + ':'))) throw new Error('missing browser UI provider');
    continue;
  }
  const peer = require(name + '/package.json');
  if (!semver.satisfies(peer.version, range)) throw new Error('incompatible chat-manager host dependency: ' + name + '@' + peer.version);
}
const client = destination + '/lib/client.js';
writeFileSync(client, patchClient(readFileSync(client, 'utf8'), version));
pkg.version = patchedVersion;
writeFileSync(destination + '/package.json', JSON.stringify(pkg, null, 2));
execFileSync('chmod', ['-R', 'a+rX', destination]);
execFileSync('tar', ['-czf', `${root}/dsh-chat-manager-${patchedVersion}.tgz`, '--transform=s,^dsh-chat-manager,package,', '-C', destination + '/..', 'dsh-chat-manager']);
execFileSync('chmod', ['644', `${root}/dsh-chat-manager-${patchedVersion}.tgz`]);
const clsx = destination + '/node_modules/clsx';
mkdirSync(clsx, { recursive: true });
execFileSync('tar', ['-xzf', `${root}/clsx-2.1.1.tgz`, '--strip-components=1', '--no-same-owner', '-C', clsx]);
execFileSync('chmod', ['-R', 'a+rX', clsx]);
host.dependencies = { ...host.dependencies, 'dsh-chat-manager': patchedVersion };
writeFileSync(hostManifest, JSON.stringify(host, null, 2));
console.log('Installed dsh-chat-manager@' + patchedVersion + ' and clsx@2.1.1 (SHA-512 verified; no lifecycle scripts; MIT retained)');