// // tokenStore.js
// const fs = require('fs');
// const path = require('path');

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

// // ensure data directory and file exist
// if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir);
// 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) {
//   const store = readStore();
//   store[shop] = { accessToken, scope, savedAt: new Date().toISOString() };
//   saveStore(store);
// }

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

// module.exports = { saveToken, getToken };


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

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

// // Ensure data directory and file exist
// if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir);
// 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');
// }

// /**
//  * Save token data, and optionally fulfillment service details.
//  * @param {string} shop - Shopify store domain.
//  * @param {string} accessToken - Access token.
//  * @param {string} scope - Granted scope.
//  * @param {object} [fulfillmentService] - Optional fulfillment service details.
//  */
// function saveToken(shop, accessToken, scope, fulfillmentService = null) {
//   const store = readStore();
//   store[shop] = {
//     accessToken,
//     scope,
//     savedAt: new Date().toISOString(),
//     fulfillmentService: fulfillmentService || null
//   };
//   saveStore(store);
// }

// /**
//  * Retrieve stored token (and fulfillment service info if available).
//  * @param {string} shop - Shopify store domain.
//  * @returns {object|null} Stored token and data.
//  */
// function getToken(shop) {
//   const store = readStore();
//   return store[shop] || null;
// }

// module.exports = { saveToken, getToken };


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

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

// Ensure data directory and file exist
if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir);
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');
}

/**
 * Save token data, and optionally fulfillment service details.
 * Will skip update if token params are null or undefined.
 * @param {string} shop - Shopify store domain.
 * @param {string|null} accessToken - Access token.
 * @param {string|null} scope - Granted scope.
 * @param {object|null} fulfillmentService - Optional fulfillment service details.
 */
function saveToken(shop, accessToken, scope, fulfillmentService = null,locationId = null) {
  if (!shop) return; // Shop is required

  const store = readStore();

  // If accessToken or scope is null/undefined, do nothing
  if (accessToken == null || scope == null) {
    return; // Skip update
  }

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

  saveStore(store);
}

/**
 * Retrieve stored token (and fulfillment service info if available).
 * @param {string} shop - Shopify store domain.
 * @returns {object|null} Stored token and data.
 */
function getToken(shop) {
  const store = readStore();
  return store[shop] || null;
}

module.exports = { saveToken, getToken };