// Vars
const IFRAME_SELECTOR = 'iframe[title="Hoofdinhoud"]';
const CELL_SELECTOR =
  'a[title="Sectie uitvouwen Algemene opleidingsonderdelen"]';
const STUDENT_NAME_CELL_SELECTOR = 'span[id="DERIVED_SCC_SUM_PERSON_NAME$5$"]'
const STUDENT_ID_CELL_SELECTOR = 'span[id="SCC_PERS_SA_VW_EMPLID"]'
const STPKT_KEUZE_CELL_SELECTOR = 'a[title="Sectie uitvouwen Keuzeopleidingsonderdelen"]'

/**
 * Extracted function to get the text content of a node.
 * @param {ElementHandle} node - The node to get the text content from.
 * @returns {Promise<string>} The text content of the node.
 */
async function getNodeTextContent(node) {
  return await node.evaluate((node) => node.textContent);
}

/**
 * Extracted function to retrieve the content frame.
 * @param {Page} page - The Puppeteer page object.
 * @returns {Promise<Frame>} The content frame.
 */
async function getContentFrame(page) {
  await page.waitForSelector(IFRAME_SELECTOR);
  const iframe = await page.$(IFRAME_SELECTOR);
  if (!iframe) {
    throw new Error("Could not find iframe on the AA-page");
  }
  console.log("iframe found on AA-page");
  return await iframe.contentFrame();
}

/**
 * Checks if the 'Startpakket' is available by verifying text content in a cell
 * and the `aria-expanded` attribute.
 *
 * @param {Page} page - The Puppeteer page object.
 * @returns {Promise<boolean>} True if the 'Startpakket' is available, false otherwise.
 */
async function isStartPakketAvailable(page) {
  const contentFrame = await getContentFrame(page);
  await contentFrame.waitForSelector(CELL_SELECTOR);
  const cell = await contentFrame.$(CELL_SELECTOR);
  const cell_keuze = await contentFrame.$(STPKT_KEUZE_CELL_SELECTOR)

  if (!cell ) {
    throw new Error(
      "Cell inside function isStartPakketAvailable is not defined"
    );
  }

  //object vars
  const isCollapsed_main = await isAriaExpandedFalse(cell);
  const isCollapsed_keuze = await getIsCollapsedKeuze(cell_keuze);
  const isCollapsed = isCollapsed_main && isCollapsed_keuze;
  const studName = await getStudName(contentFrame);
  const studId = await getStudId(contentFrame);

  return {
    isCollapsed: isCollapsed,
    isCollapsed_main: isCollapsed_main,
    isCollapsed_keuze: isCollapsed_keuze,
    studName: studName,
    studId: studId,
    // more properties here
  };
}

/**
 * Checks if the given cell node has an `aria-expanded` attribute with a value of 'false'.
 *
 * @param {ElementHandle} node - The node to check the `aria-expanded` attribute.
 * @returns {Promise<boolean>} True if the `aria-expanded` attribute is 'false', false otherwise.
 */
async function isAriaExpandedFalse(node) {
  if (!node) {
    throw new Error("Node is not defined");
  }
  return await node.evaluate(
    (element) => element.getAttribute("aria-expanded") === "false"
  );
}

async function getIsCollapsedKeuze(cell_keuze) {
  if (cell_keuze) {
    return await isAriaExpandedFalse(cell_keuze);
  } else {
    return false;
  }
}

async function getStudName(frame) {
  const cell = await frame.$(STUDENT_NAME_CELL_SELECTOR);
  if (!cell) {
    throw new Error("Cell student name is not defined");
  }
  return await getNodeTextContent(cell);
}

async function getStudId(frame) {
  const cell = await frame.$(STUDENT_ID_CELL_SELECTOR);
  if (!cell) {
    throw new Error("Cell student id is not defined");
  }
  return await getNodeTextContent(cell);
}

module.exports = isStartPakketAvailable;