/**
 * Ejemplo didáctico de Alberto Lara Hernández, 11-09-2026.
 * Ejecutar: node ejemplo-identidad.mjs (Node.js 22 o posterior).
 * Datos ficticios. Sin red ni persistencia: no es un conector Moodle.
 * Supone un emisor único y autorizado con revisiones crecientes por identidad.
 * No implementa autenticación, concurrencia, sesiones ni conciliación.
 */
import assert from 'node:assert/strict';

const identities = new Map();
const received = new Set();

function receive(event) {
  assert.ok(event.id && event.subject);
  assert.ok(Number.isSafeInteger(event.revision) && event.revision > 0);
  assert.ok(['active', 'suspended'].includes(event.status));
  if (received.has(event.id)) return 'duplicate';
  const current = identities.get(event.subject);
  if (current && event.revision <= current.revision) return 'outdated';
  identities.set(event.subject, { revision: event.revision, status: event.status });
  received.add(event.id);
  return 'applied';
}

const creation = { id: 'event-1', subject: 'example:person-1', revision: 1, status: 'active' };
const suspension = { id: 'event-2', subject: 'example:person-1', revision: 2, status: 'suspended' };
assert.equal(receive(creation), 'applied');
assert.equal(identities.get(creation.subject).status, 'active');
assert.equal(receive(suspension), 'applied');
assert.equal(receive(suspension), 'duplicate');
assert.equal(receive({ ...creation, id: 'delayed-event' }), 'outdated');
assert.deepEqual(identities.get(creation.subject), { revision: 2, status: 'suspended' });
console.log('Alta, baja, duplicado y evento antiguo comprobados. Estado final: suspended.');