app.js

if ("serviceWorker" in navigator) {
  window.addEventListener("load", function() {
      navigator.serviceWorker
          .register("./serviceWorker.js")
          .then(res => console.log("service worker registered"))
          .catch(err => console.log("service worker not registered", err));
  });
}

document.addEventListener('DOMContentLoaded', function() {
  const basePath = window.location.pathname.includes('timetable_csea') ? '/timetable_csea' : '';
  const section = localStorage.getItem('section');
  const currentPath = window.location.pathname;

  if (section && section !== 'a') {
      const targetPath = `${basePath}/sections/cse${section}.html`;
      if (currentPath !== targetPath) {
          window.location.pathname = targetPath;
      }
  }

  if (section) {
      const classSelect = document.getElementById('class');
      if (classSelect) {
          classSelect.value = section;
      }
  }

  document.getElementById('class').addEventListener('change', () => {
          const section = document.getElementById('class').value;
          localStorage.setItem('section', section);
          let redirectPath = '';

          switch (section) {
              case 'a':
                  redirectPath = `${basePath}/index.html`;
                  break;
              case 'b':
                  redirectPath = `${basePath}/sections/cseb.html`;
                  break;
              case 'c':
                  redirectPath = `${basePath}/sections/csec.html`;
                  break;
              case 'd':
                  redirectPath = `${basePath}/sections/csed.html`;
                  break;
              case 'e':
                  redirectPath = `${basePath}/sections/csee.html`;
                  break;
              case 'f':
                  redirectPath = `${basePath}/sections/csef.html`;
                  break;
              default:
                  break;
          }

          if (redirectPath) {
              window.location.href = redirectPath;
          }
  });

  const classForm = document.getElementById('class-form');
  if (classForm) {
      classForm.addEventListener('submit', function(event) {
          event.preventDefault();

          //console.log('submitted');

          const section = document.getElementById('class').value;
          localStorage.setItem('section', section);
          let redirectPath = '';

          switch (section) {
              case 'a':
                  redirectPath = `${basePath}/index.html`;
                  break;
              case 'b':
                  redirectPath = `${basePath}/sections/cseb.html`;
                  break;
              case 'c':
                  redirectPath = `${basePath}/sections/csec.html`;
                  break;
              case 'd':
                  redirectPath = `${basePath}/sections/csed.html`;
                  break;
              case 'e':
                  redirectPath = `${basePath}/sections/csee.html`;
                  break;
              case 'f':
                  redirectPath = `${basePath}/sections/csef.html`;
                  break;
              default:
                  break;
          }

          if (redirectPath) {
              window.location.href = redirectPath;
          }
      });
  }
});