// freeAccessStore.js — persistent whitelist of shops granted free access
const fs   = require('fs');
const path = require('path');

const dataFile = path.resolve(__dirname, 'data', 'freeAccess.json');
const dataDir  = path.dirname(dataFile);

if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir, { recursive: true });
if (!fs.existsSync(dataFile)) {
  // seed with the shop that was previously hardcoded
  fs.writeFileSync(dataFile, JSON.stringify({
    "racewerksengg.myshopify.com": {
      grantedAt: new Date().toISOString(),
      expiresAt: null,
      note: "Internal test shop (migrated from hardcode)"
    }
  }, null, 2), 'utf8');
}

function readStore() {
  try { return JSON.parse(fs.readFileSync(dataFile, 'utf8')); }
  catch { return {}; }
}

function saveStore(store) {
  fs.writeFileSync(dataFile, JSON.stringify(store, null, 2), 'utf8');
}

function isShopAllowed(shop) {
  if (!shop) return false;
  const store = readStore();
  const entry = store[shop.toLowerCase().trim()];
  if (!entry) return false;
  if (!entry.expiresAt) return true;          // permanent grant
  return new Date(entry.expiresAt) > new Date();
}

function addShop(shop, expiresAt, note = '') {
  const store = readStore();
  const key = shop.toLowerCase().trim();
  store[key] = {
    grantedAt: new Date().toISOString(),
    expiresAt: expiresAt || null,
    note: note || '',
  };
  saveStore(store);
  return store[key];
}

function removeShop(shop) {
  const store = readStore();
  const key = shop.toLowerCase().trim();
  delete store[key];
  saveStore(store);
}

function listShops() {
  const store = readStore();
  const now = new Date();
  return Object.entries(store).map(([shop, entry]) => ({
    shop,
    grantedAt: entry.grantedAt,
    expiresAt: entry.expiresAt,
    note: entry.note || '',
    expired: entry.expiresAt ? new Date(entry.expiresAt) <= now : false,
    permanent: !entry.expiresAt,
  }));
}

module.exports = { isShopAllowed, addShop, removeShop, listShops };