const XOR_KEY = "BofangKey";
const PREFIX = "#02";

function encryptXOR(text, key) {
  let encrypted = "";
  for (let i = 0; i < text.length; i++) {
    encrypted += String.fromCharCode(text.charCodeAt(i) ^ key.charCodeAt(i % key.length));
  }
  return encrypted;
}

function encryptSQL(sql) {
  return PREFIX + encryptXOR(encodeURIComponent(sql), XOR_KEY);
}

function getSessionToken() {
  const Parse = getApp().Parse;
  const currentUser = Parse && Parse.User && Parse.User.current();
  if (!currentUser) return "";
  if (typeof currentUser.getSessionToken == "function") {
    return currentUser.getSessionToken();
  }
  return currentUser.get && currentUser.get("sessionToken") || "";
}

function buildNovaQLData(sql, params) {
  const data = {
    sql: encryptSQL(sql),
    token: getSessionToken(),
  };
  if (Array.isArray(params) && params.length > 0) {
    data.params = JSON.stringify(params);
  }
  return data;
}

module.exports = {
  encryptSQL,
  buildNovaQLData,
};