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

const PAYMENT_STORAGE_ROOT = process.env.PORTAL_PAYMENT_STORAGE_ROOT || '/data/wifiplatform/storage/payment';
const PUBLIC_PAYMENT_ASSET_PREFIX = '/portal/assets/payment';

function ensureDir(dirPath) {
  fs.mkdirSync(dirPath, { recursive: true });
  return dirPath;
}

function ensurePaymentStorageRoot() {
  return ensureDir(PAYMENT_STORAGE_ROOT);
}

function getDevicePaymentDir(deviceId) {
  return path.join(PAYMENT_STORAGE_ROOT, String(deviceId));
}

function ensureDevicePaymentDir(deviceId) {
  return ensureDir(getDevicePaymentDir(deviceId));
}

function makePaymentAssetUrl(deviceId, fileName) {
  return `${PUBLIC_PAYMENT_ASSET_PREFIX}/${encodeURIComponent(String(deviceId))}/${encodeURIComponent(fileName)}`;
}

function resolvePaymentAssetPath(deviceId, fileName) {
  const safeName = path.basename(String(fileName || ''));
  return path.join(getDevicePaymentDir(deviceId), safeName);
}

module.exports = {
  PAYMENT_STORAGE_ROOT,
  ensurePaymentStorageRoot,
  ensureDevicePaymentDir,
  getDevicePaymentDir,
  makePaymentAssetUrl,
  resolvePaymentAssetPath,
};