// In-memory synthetic store only; no filesystem or production backend.
import { refuse, validateFixtureCredential } from './execution.mjs';
const stores = new WeakSet();
export const isFixtureStore = store => stores.has(store);
export function createFixtureCredentialStore(initial) {
  const records = new Map(), locks = new Set();
  for (const [ref, value] of Object.entries(initial)) {
    if (!/^[a-z0-9][a-z0-9._-]{0,63}\/[a-z0-9][a-z0-9._-]{0,63}$/.test(ref)) refuse('invalid-account-ref');
    records.set(ref, validateFixtureCredential(value, value?.type ?? 'none'));
  }
  const store = Object.freeze({
    fixtureOnly: true,
    async transaction(refs, callback) {
      const keys = [...new Set(refs)].sort();
      for (const key of keys) {
        if (!records.has(key)) refuse('missing-fixture-credential');
        if (locks.has(key)) refuse('credential-busy');
      }
      keys.forEach(key => locks.add(key));
      try {
        const draft = new Map(keys.map(key => [key, structuredClone(records.get(key))]));
        const result = await callback(draft);
        for (const key of keys) validateFixtureCredential(draft.get(key), records.get(key)?.type ?? 'none');
        keys.forEach(key => records.set(key, structuredClone(draft.get(key))));
        return result;
      } finally { keys.forEach(key => locks.delete(key)); }
    },
  });
  stores.add(store);
  return store;
}