// mur.js
// Meaning Unit Registry (MUR) — append-only registry of Meaning Units

const fs = require('fs');
const path = require('path');

const REGISTRY_PATH = path.join(__dirname, 'mur.json');

// Ensure registry exists
function ensureRegistry() {
  if (!fs.existsSync(REGISTRY_PATH)) {
    fs.writeFileSync(REGISTRY_PATH, JSON.stringify({ registryVersion: "v0.1", units: [] }, null, 2));
  }
}

// Add MU to registry
function registerMU(mu) {
  ensureRegistry();

  const registry = JSON.parse(fs.readFileSync(REGISTRY_PATH, 'utf8'));

  // Append-only
  registry.units.push({
    id: mu.id,
    compiledAt: mu.compiledAt,
    length: mu.payload.length,
    type: mu.payload.type
  });

  fs.writeFileSync(REGISTRY_PATH, JSON.stringify(registry, null, 2));

  return registry;
}

module.exports = { registerMU };