// #1873 proxy setup: host facts that `mosaic proxy` and the Console page share. Never reads a
// key, proxy setting or bus record; labels only, never an absolute path.
import net from 'node:net';
import { hostStatus } from './host.mjs';
import { socketPath, orgPaths } from './config.mjs';
import { devOwnerInstance } from './dev-local-owner.mjs';
import { listOrgs } from '../../organization/src/org-registry.mjs';

// A socket that accepts a connection, or fails other than "absent"/"refused", counts as running.
function socketLive(file, timeout = 1000) {
  return new Promise(resolve => {
    const socket = net.connect(file);
    const done = value => { socket.destroy(); resolve(value); };
    socket.setTimeout(timeout, () => done(true));
    socket.once('connect', () => done(true));
    socket.once('error', error => done(!['ENOENT', 'ECONNREFUSED'].includes(error.code)));
  });
}

async function rootRunning(root, socket) {
  try {
    const status = hostStatus(root);
    if (status.host?.live || status.writerLock?.live) return true;
  } catch { return true; }
  return socketLive(socket);
}

// The init-lock README condition "the bus is stopped", proved for the instance's own bus and
// every registered organization's bus. Anything that cannot be examined counts as running.
// `listOrgsFn` and `running` are for tests.
export async function busesStopped({ dataRoot, configDir, listOrgsFn = listOrgs, running = rootRunning }) {
  const out = [];
  if (await running(dataRoot, socketPath(dataRoot))) out.push('the instance bus');
  let orgs;
  try { orgs = await listOrgsFn({ configDir }); }
  catch { return { stopped: false, running: [...out, 'organization registry unreadable'] }; }
  for (const org of orgs) {
    const label = `organization ${typeof org?.id === 'string' ? org.id : '?'}`;
    let paths;
    try { paths = orgPaths(org.root); } catch { out.push(label); continue; }
    if (await running(org.root, paths.socket)) out.push(label);
  }
  return { stopped: out.length === 0, running: out };
}

// The named instance MOSAIC_CONFIG selects, or null for the default (dev) instance.
export function instanceFromConfig(env = process.env) {
  try { return devOwnerInstance(env); } catch { return null; }
}