import { logout } from '../oauth.js';
import { readConfig, mutateConfig, resolveUser, userLabel } from '../config.js';

// tangy logout [-u user] — log out one user; any other users stay logged in.
export async function logoutCommand(opts = {}) {
  const config = await readConfig();
  if (Object.keys(config.users).length === 0) {
    console.log('Not logged in.');
    return;
  }
  const user = resolveUser(config, opts.user);

  await logout(user.did);

  let nextDefault = null;
  let leftWithoutDefault = false;
  await mutateConfig((c) => {
    delete c.users[user.did];
    if (!c.users[c.defaultUser]) {
      // The default user went away: promote a sole remaining user, otherwise
      // leave the choice to the user.
      const remaining = Object.keys(c.users);
      c.defaultUser = remaining.length === 1 ? remaining[0] : null;
      nextDefault = c.defaultUser
        ? c.users[c.defaultUser].handle || c.defaultUser
        : null;
      leftWithoutDefault = !c.defaultUser && remaining.length > 0;
    }
  });

  console.log(`✓ Logged out ${userLabel(user)}.`);
  if (nextDefault) console.log(`  Default user is now ${nextDefault}.`);
  if (leftWithoutDefault) {
    console.log(
      '  No default user set — pass -u <user> or run `tangy user default <user>`.',
    );
  }
}