const HEADER_LINES = new Set([
  "OVERVIEW",
  "PRE-SCREENING",
  "WORK TERM RATINGS",
  "JOB POSTING INFORMATION",
  "APPLICATION INFORMATION",
  "COMPANY INFORMATION",
  "SERVICE TEAM"
]);

function sanitizePostingText(text) {
  let cleaned = text.replaceAll("fiber_manual_record", "");
  const lines = cleaned.split(/\r?\n/);
  const filtered = lines.filter((line) => {
    const trimmed = line.trim();
    if (!trimmed) return true;
    return !HEADER_LINES.has(trimmed.toUpperCase());
  });

  cleaned = filtered.join("\n");
  cleaned = cleaned.replace(/[ \t]+/g, " ");
  cleaned = cleaned.replace(/\n{3,}/g, "\n\n");
  return cleaned.trim();
}

function extractPostingText() {
  const contents = [...document.getElementsByClassName("modal__content")];
  if (!contents.length) {
    return { ok: false, error: "No modal content found on this page." };
  }

  // WaterlooWorks renders multiple modal containers; choose the longest visible text block.
  const el = contents.reduce((best, cur) =>
    cur.innerText.length > best.innerText.length ? cur : best
  );

  const rawText = el.innerText;
  const sanitized = sanitizePostingText(rawText);

  return { ok: true, rawText, sanitized };
}

chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
  if (message?.type !== "EXTRACT_POSTING") return;

  const result = extractPostingText();
  sendResponse(result);
});