/*************************************************
 *  Academic: the personal website framework for Hugo.
 *  https://github.com/gcushen/hugo-academic
 **************************************************/

(function($){

  /* ---------------------------------------------------------------------------
   * Responsive scrolling for URL hashes.
   * --------------------------------------------------------------------------- */

  // Dynamically get responsive navigation bar offset.
  let $navbar = $('.navbar-header');
  let navbar_offset = $navbar.innerHeight();

  /**
   * Responsive hash scrolling.
   * Check for a URL hash as an anchor.
   * If it exists on current page, scroll to it responsively.
   * If `target` argument omitted (e.g. after event), assume it's the window's hash.
   */
  function scrollToAnchor(target) {
    // If `target` is undefined or HashChangeEvent object, set it to window's hash.
    target = (typeof target === 'undefined' || typeof target === 'object') ? window.location.hash : target;
    // Escape colons from IDs, such as those found in Markdown footnote links.
    target = target.replace(/:/g, '\\:');

    // If target element exists, scroll to it taking into account fixed navigation bar offset.
    if($(target).length) {
      $('body').addClass('scrolling');
      $('html, body').animate({
        scrollTop: $(target).offset().top - navbar_offset
      }, 600, function () {
        $('body').removeClass('scrolling');
      });
    }
  }

  // Make Scrollspy responsive.
  function fixScrollspy() {
    let $body = $('body');
    let data = $body.data('bs.scrollspy');
    if (data) {
      data.options.offset = navbar_offset;
      $body.data('bs.scrollspy', data);
      $body.scrollspy('refresh');
    }
  }

  // Check for hash change event and fix responsive offset for hash links (e.g. Markdown footnotes).
  window.addEventListener("hashchange", scrollToAnchor);

  /* ---------------------------------------------------------------------------
   * Add smooth scrolling to all links inside the main navbar.
   * --------------------------------------------------------------------------- */

  $('#navbar-main li.nav-item a').on('click', function(event) {
    // Store requested URL hash.
    let hash = this.hash;

    // If we are on the homepage and the navigation bar link is to a homepage section.
    if ( hash && $(hash).length && ($("#homepage").length > 0)) {
      // Prevent default click behavior.
      event.preventDefault();

      // Use jQuery's animate() method for smooth page scrolling.
      // The numerical parameter specifies the time (ms) taken to scroll to the specified hash.
      $('html, body').animate({
        scrollTop: $(hash).offset().top - navbar_offset
      }, 800);
    }
  });

  /* ---------------------------------------------------------------------------
   * Smooth scrolling for Back To Top link.
   * --------------------------------------------------------------------------- */

  $('#back_to_top').on('click', function(event) {
    event.preventDefault();
    $('html, body').animate({
      'scrollTop': 0
    }, 800, function() {
      window.location.hash = "";
    });
  });

  /* ---------------------------------------------------------------------------
   * Hide mobile collapsable menu on clicking a link.
   * --------------------------------------------------------------------------- */

  $(document).on('click', '.navbar-collapse.in', function(e) {
    if ( $(e.target).is('a') && $(e.target).attr('class') != 'dropdown-toggle' ) {
      $(this).collapse('hide');
    }
  });

  /* ---------------------------------------------------------------------------
   * Filter projects.
   * --------------------------------------------------------------------------- */

  let $grid_projects = $('#container-projects');
  $grid_projects.imagesLoaded(function () {
    // Initialize Isotope after all images have loaded.
    $grid_projects.isotope({
      itemSelector: '.isotope-item',
      layoutMode: 'masonry'
    });

    // Filter items when filter link is clicked.
    $('#filters a').click(function () {
      let selector = $(this).attr('data-filter');
      $grid_projects.isotope({filter: selector});
      $(this).removeClass('active').addClass('active').siblings().removeClass('active all');
      return false;
    });
  });

  /* ---------------------------------------------------------------------------
   * Filter publications.
   * --------------------------------------------------------------------------- */

  let $grid_pubs = $('#container-publications');
  $grid_pubs.isotope({
    itemSelector: '.isotope-item',
    percentPosition: true,
    masonry: {
      // Use Bootstrap compatible grid layout.
      columnWidth: '.grid-sizer'
    }
  });

  // Bind publication filter on dropdown change.
  $('.pub-filters-select').on('change', function() {
    // Get filter value from option value.
    let filterValue = this.value;
    // Apply filter to Isotope.
    $grid_pubs.isotope({ filter: filterValue });

    // Set hash URL to current filter.
    let url = $(this).val();
    if (url.substr(0, 9) == '.pubtype-') {
      window.location.hash = url.substr(9);
    } else {
      window.location.hash = '';
    }
  });

  // Filter publications according to hash in URL.
  function filter_publications() {
    let urlHash = window.location.hash.replace('#','');
    let filterValue = '*';

    // Check if hash is numeric.
    if (urlHash != '' && !isNaN(urlHash)) {
      filterValue = '.pubtype-' + urlHash;
    }

    $('.pub-filters-select').val(filterValue);
    $grid_pubs.isotope({ filter: filterValue });
  }

  /* ---------------------------------------------------------------------------
   * On window load.
   * --------------------------------------------------------------------------- */

  $(window).on('load', function() {

    if (window.location.hash) {
      // When accessing homepage from another page and `#top` hash is set, show top of page (no hash).
      if (window.location.hash == "#top") {
        window.location.hash = ""
      } else {
        // If URL contains a hash, scroll to target ID taking into account responsive offset.
        scrollToAnchor();
      }
    }

    // Initialize Scrollspy.
    let $body = $('body');
    $body.scrollspy({offset: navbar_offset });

    // Call `fixScrollspy` when window is resized.
    let resizeTimer;
    $(window).resize(function() {
      clearTimeout(resizeTimer);
      resizeTimer = setTimeout(fixScrollspy, 200);
    });

    // Enable publication filter for publication index page.
    if ($('.pub-filters-select')) {
      filter_publications();
      // Useful for changing hash manually (e.g. in development):
      // window.addEventListener('hashchange', filter_publications, false);
    }

  });

})(jQuery);