import { minerPreference } from './miner.js';
import { LocalChain } from './adapters/chain.js';
import { TestWallet, NETWORK } from './adapters/wallet.js';
export const STORAGE_KEY = 'super-testnet:lab:v1';
export function decodeLab(raw) {
  if (!raw) return { wallet: null, chain: new LocalChain(), miner: minerPreference() };
  const data = JSON.parse(raw);
  if (data.kind !== 'test-lab' || data.network !== NETWORK || data.version !== 1) throw new Error('Unsupported lab backup.');
  return { wallet: data.wallet ? TestWallet.load(data.wallet) : null, chain: new LocalChain(data.chain), miner: minerPreference(data.miner) };
}
export const encodeLab = lab => JSON.stringify({
  kind: 'test-lab', network: NETWORK, version: 1,
  wallet: lab.wallet?.backup() ?? null, chain: lab.chain.snapshot(), miner: minerPreference(lab.miner),
});
export const readLab = () => decodeLab(localStorage.getItem(STORAGE_KEY));
export function saveLab(lab) {
  try { localStorage.setItem(STORAGE_KEY, encodeLab(lab)); }
  catch { throw new Error('Browser storage is full or unavailable. No changes were saved. Export a lab backup before clearing storage.'); }
}

// Shared by manual mining, auto mining, and all other lab mutations.
export async function mutateLab(action, { locks = navigator.locks, read = readLab, save = saveLab } = {}) {
  if (!locks) throw new Error('This app needs a secure-context browser with Web Locks. Use localhost or HTTPS.');
  return locks.request(STORAGE_KEY, async () => {
    const candidate = read();
    const changed = await action(candidate);
    if (changed !== false) save(candidate);
    return { lab: candidate, changed: changed !== false };
  });
}