import { readFileSync, writeFileSync } from 'node:fs';
import { join, resolve } from 'node:path';
import { pathToFileURL } from 'node:url';

export const target = 'const persistence = ctx.remote.$host.isLoopback ? "host" : "memory";';
const replacement = 'const persistence = "host"; /* dsh-mgr: authenticated remote settings */';

// Deliberately scoped to the settings UI, not connection.isLoopback or auth.
// Fail closed on upstream changes instead of silently shipping a broken UI.
export function patchSettings(source, version) {
  if (version !== '0.2.0-rc.2') throw new Error('unsupported DSH version for host settings patch');
  if (source.split(target).length !== 2 || source.includes(replacement)) {
    throw new Error('expected exactly one unpatched settings persistence selector');
  }
  return source.replace(target, replacement);
}

export function install(root = '/usr/local/lib/node_modules/@deepseek-ai/dsh') {
  const { version } = JSON.parse(readFileSync(join(root, 'package.json'), 'utf8'));
  const file = join(root, 'node_modules/@deepseek-ai/dsh-client-ui-settings/lib/client.js');
  const source = readFileSync(file, 'utf8');
  writeFileSync(file, patchSettings(source, version));
}

if (process.argv[1] && import.meta.url === pathToFileURL(resolve(process.argv[1])).href) {
  install();
}