const fs = require("node:fs");
const path = require("node:path");

const dataFile = path.resolve(__dirname, "data", "tokens.json");
const dataDir = path.dirname(dataFile);

if (!fs.existsSync(dataDir)) {
  fs.mkdirSync(dataDir, { recursive: true });
}

if (!fs.existsSync(dataFile)) {
  fs.writeFileSync(dataFile, "{}", "utf8");
}

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

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

function saveToken(shop, accessToken, scope, fulfillmentService = null, locationId = null) {
  if (!shop || accessToken == null || scope == null) {
    return;
  }

  const store = readStore();
  store[shop] = {
    accessToken,
    scope,
    savedAt: new Date().toISOString(),
    locationId: locationId || store[shop]?.locationId || null,
    fulfillmentService: fulfillmentService || store[shop]?.fulfillmentService || null,
  };
  saveStore(store);
}

function getToken(shop) {
  const store = readStore();
  return store[shop] || null;
}

function deleteToken(shop) {
  if (!shop) {
    return;
  }

  const store = readStore();
  delete store[shop];
  saveStore(store);
}

function listTokens() {
  return readStore();
}

module.exports = {
  saveToken,
  getToken,
  deleteToken,
  listTokens,
};