(function (root, factory) {
  if (typeof module === 'object' && module.exports) {
    module.exports = factory();
  } else {
    root.ISMIStools = Object.assign(root.ISMIStools || {}, factory());
  }
})(typeof self !== 'undefined' ? self : this, function () {
  'use strict';

  function cleanText(s) {
    return String(s == null ? '' : s)
      .replace(/<[^>]+>/g, ' ')
      .replace(/&nbsp;/gi, ' ')
      .replace(/\s+/g, ' ')
      .trim();
  }

  function extractRows(html) {
    const rows = [];
    const trRe = /<tr[^>]*>([\s\S]*?)<\/tr>/gi;
    let trMatch;
    while ((trMatch = trRe.exec(html)) !== null) {
      const rowHtml = trMatch[1];
      if (/<th/i.test(rowHtml)) continue;
      const tds = [];
      const tdRe = /<td[^>]*>([\s\S]*?)<\/td>/gi;
      let tdMatch;
      while ((tdMatch = tdRe.exec(rowHtml)) !== null) {
        tds.push(cleanText(tdMatch[1]));
      }
      rows.push(tds);
    }
    return rows;
  }

  function parseStudyLoadTable(html) {
    return extractRows(html)
      .filter((tds) => tds.length >= 6)
      .map((tds) => ({
        group: tds[0],
        courseCode: tds[1],
        schedule: tds[2],
        faculty: tds[3],
        units: tds[4],
        status: tds[5]
      }));
  }

  function parseProfilePage(html) {
    const result = {};
    const h3Match = /<h3[^>]*>([\s\S]*?)<\/h3>/i.exec(html);
    const bMatch = (h3Match && /<b>([\s\S]*?)<\/b>/i.exec(h3Match[1])) ||
      /<b>([\s\S]*?)<\/b>/i.exec(html);
    if (bMatch) result.program = cleanText(bMatch[1]);

    const smallMatch = /<small>([\s\S]*?)<\/small>/i.exec(html);
    if (smallMatch) {
      const lines = smallMatch[1].split(/<br\s*\/?>/i).map(cleanText).filter(Boolean);
      result.semester = lines[lines.length - 1] || '';
    }

    const kvRe = /<td[^>]*>([\s\S]*?)<\/td>\s*<td[^>]*class=["'][^"']*\bbold\b[^"']*["'][^>]*>([\s\S]*?)<\/td>/gi;
    let m;
    while ((m = kvRe.exec(html)) !== null) {
      const key = cleanText(m[1]);
      const val = cleanText(m[2]);
      if (/full name/i.test(key)) result.fullName = val;
      else if (/student id/i.test(key)) result.studentId = val;
      else if (/year level/i.test(key)) result.yearLevel = val;
      else if (/student type/i.test(key)) result.studentType = val;
    }
    return result;
  }

  function parseOfferedCourses(html) {
    return extractRows(html)
      .filter((tds) => tds.length >= 2)
      .map((tds) => ({
        courseCode: tds[0].split('-')[0].trim(),
        description: tds[1]
      }));
  }

  return { parseStudyLoadTable, parseProfilePage, parseOfferedCourses };
});