{{ if .Site.Params.custom_js }}
{{ range .Site.Params.custom_js }}
  {{ $custom_template := resources.Get . }}
  {{ if $custom_template }}
    {{ $custom_js := $custom_template | resources.Minify | resources.Fingerprint }}
    <script defer src="{{ $custom_js.RelPermalink }}"></script>
  {{ end }}
{{ end }}
{{ end }}

{{ if $.Param "enableSearch" }}
  {{ $fuse := resources.Get "js/fuse.min.js" | resources.Fingerprint }}
  <script defer src="{{ $fuse.RelPermalink }}"></script>
{{ end }}

{{ $enquire := resources.Get "js/enquire.min.js" | resources.Fingerprint }}
<script src="{{ $enquire.RelPermalink }}"></script>
{{ $lazysizes := resources.Get "js/lazysizes.min.js" | resources.Fingerprint }}
<script defer src="{{ $lazysizes.RelPermalink }}"></script>
{{ $getParents := resources.Get "js/helper/getParents.js" | resources.Minify | resources.Fingerprint }}
<script defer src="{{ $getParents.RelPermalink }}"></script>
{{ $fadeinout := resources.Get "js/helper/fadeinout.js" | resources.Minify | resources.Fingerprint }}
<script defer src="{{ $fadeinout.RelPermalink }}"></script>
{{ $closest := resources.Get "js/helper/closest.js" | resources.Minify }}
<script defer src="{{ $closest.RelPermalink }}"></script>
  
<script>
  "use strict";

  // ========================== poiyfill ==========================
  // forEach
  if (window.NodeList && !NodeList.prototype.forEach) {
    NodeList.prototype.forEach = Array.prototype.forEach;
  }

  // includes
  if (!String.prototype.includes) {
    String.prototype.includes = function (search, start) {
      'use strict';

      if (search instanceof RegExp) {
        throw TypeError('first argument must not be a RegExp');
      }
      if (start === undefined) { start = 0; }
      return this.indexOf(search, start) !== -1;
    };
  }

  // append
  Document.prototype.append = Element.prototype.append = function append() {
    this.appendChild(_mutation(arguments));
  };
  function _mutation(nodes) {
    if (!nodes.length) {
      throw new Error('DOM Exception 8');
    } else if (nodes.length === 1) {
      return typeof nodes[0] === 'string' ? document.createTextNode(nodes[0]) : nodes[0];
    } else {
      var
      fragment = document.createDocumentFragment(),
      length = nodes.length,
      index = -1,
      node;

      while (++index < length) {
        node = nodes[index];

        fragment.appendChild(typeof node === 'string' ? document.createTextNode(node) : node);
      }

      return fragment;
    }
  }

  // startsWith
  if (!String.prototype.startsWith) {
    String.prototype.startsWith = function (searchString, position) {
      position = position || 0;
      return this.indexOf(searchString, position) === position;
    };
  }
  // ===============================================================


  document.addEventListener('DOMContentLoaded', function () {
    // ===================== navbar collapse ======================
    var navCollapseBtn = document.querySelector('.navbar__burger');
    navCollapseBtn ? navCollapseBtn.addEventListener('click', function (e) {
      var navCollapse = document.querySelector('.navbarm__collapse');

      if (navCollapse) {
        var dataOpen = navCollapse.getAttribute('data-open');

        if (dataOpen === 'true') {
          navCollapse.setAttribute('data-open', 'false');
          navCollapse.style.maxHeight = 0;
          navCollapseBtn.classList.remove('is-active');
        } else {
          navCollapse.setAttribute('data-open', 'true');
          navCollapse.style.maxHeight = navCollapse.scrollHeight + "px";
          navCollapseBtn.classList.add('is-active');
        }
      }
    }) : null;
    // ============================================================


    // ======================== markdown table ====================
    var tables = document.querySelectorAll('.single__contents > table');
    for (let i = 0; i < tables.length; i++) {
      var table = tables[i];
      var wrapper = document.createElement('div');
      wrapper.className = 'table-wrapper';
      table.parentElement.replaceChild(wrapper, table);
      wrapper.appendChild(table);
    }
    // ============================================================


    // ========================== foot notes ======================
    var footNoteRefs = document.querySelectorAll('.footnote-ref');
    var footNoteBackRefs = document.querySelectorAll('.footnote-backref');

    footNoteRefs ? 
    footNoteRefs.forEach(function(elem, idx) {
      elem.onmouseenter = function () {
        if (navbar.classList.contains('scrolling')) {
          navbar.classList.remove('scrolling');
        }
      }

      elem.onmouseleave = function () {
        if (!navbar.classList.contains('scrolling')) {
          setTimeout(function () {
            navbar.classList.add('scrolling');
          }, 100);
        }
      }

      elem.onclick = function () {
        if (!navbar.classList.contains('scrolling')) {
          navbar.classList.remove('navbar--show');
          navbar.classList.remove('navbar--hide');
          navbar.classList.add('navbar--hide');
        }
      }
    }) : null;

    footNoteBackRefs ? 
    footNoteBackRefs.forEach(function(elem, idx) {
      elem.onmouseenter = function () {
        if (navbar.classList.contains('scrolling')) {
          navbar.classList.remove('scrolling');
        }
      }

      elem.onmouseleave = function () {
        if (!navbar.classList.contains('scrolling')) {
          setTimeout(function() {
            navbar.classList.add('scrolling');
          }, 100);
        }
      }

      elem.onclick = function () {
        if (!navbar.classList.contains('scrolling')) {
          navbar.classList.remove('navbar--show');
          navbar.classList.remove('navbar--hide');
          navbar.classList.add('navbar--hide');
        }
      }
    }) : null;
    // ============================================================


    // =================== search-result desktop ==================
    var summaryContainer = document.querySelector('.summary__container');
    var searchResult = document.querySelector('.search-result');
    var searchResultCloseBtn = document.querySelector('.search-result__close');
    searchResultCloseBtn ? searchResultCloseBtn.addEventListener('click', function (e) {
      searchResult.setAttribute('data-display', 'none');
      summaryContainer.setAttribute('data-display', 'block');
    }) : null;
    // =============================================================


    // ============================ tab ============================
    document.querySelectorAll('.tab') ? 
    document.querySelectorAll('.tab').forEach(function(elem, idx) {
      var containerId = elem.getAttribute('id');
      var containerElem = elem;
      var tabLinks = elem.querySelectorAll('.tab__link');
      var tabContents = elem.querySelectorAll('.tab__content');
      var ids = [];

      tabLinks && tabLinks.length > 0 ?
      tabLinks.forEach(function(link, index, self) {
        link.onclick = function(e) {
          for (var i = 0; i < self.length; i++) {
            if (index === parseInt(i, 10)) {
              if (!self[i].classList.contains('active')) {
                self[i].classList.add('active');
                tabContents[i].style.display = 'block';
              }
            } else {
              self[i].classList.remove('active');
              tabContents[i].style.display = 'none';
            }
          }
        }
      }) : null;
    }) : null;
    // =============================================================


    // ========================== codetab ==========================
    document.querySelectorAll('.codetab') ? 
    document.querySelectorAll('.codetab').forEach(function(elem, idx) {
      var containerId = elem.getAttribute('id');
      var containerElem = elem;
      var codetabLinks = elem.querySelectorAll('.codetab__link');
      var codetabContents = elem.querySelectorAll('.codetab__content');
      var ids = [];

      codetabLinks && codetabLinks.length > 0 ?
      codetabLinks.forEach(function(link, index, self) {
        link.onclick = function(e) {
          for (var i = 0; i < self.length; i++) {
            if (index === parseInt(i, 10)) {
              if (!self[i].classList.contains('active')) {
                self[i].classList.add('active');
                codetabContents[i].style.display = 'block';
              }
            } else {
              self[i].classList.remove('active');
              codetabContents[i].style.display = 'none';
            }
          }
        }
      }) : null;
    }) : null;
    // =============================================================


    // ========================= go to top =========================
    var gttBtn = document.getElementById("gtt");
    gttBtn.style.display = "none";
    gttBtn.addEventListener('click', function () {
      if (window.document.documentMode) {
        document.documentElement.scrollTop = 0;
      } else {
        scrollToTop(250);
      }
    });

    function scrollToTop(scrollDuration) {
      var scrollStep = -window.scrollY / (scrollDuration / 15);
      var scrollInterval = setInterval(function () {
        if (window.scrollY != 0) {
          window.scrollBy(0, scrollStep);
        }
        else clearInterval(scrollInterval);
      }, 15);
    }

    var scrollFunction = function () {
      if (document.body.scrollTop > 250 || document.documentElement.scrollTop > 250) {
        gttBtn.style.display = "block";
      } else {
        gttBtn.style.display = "none";
      }
    }
    // ============================================================


    // ========================== expand ==========================
    var expandBtn = document.querySelectorAll('.expand__button');

    for (let i = 0; i < expandBtn.length; i++) {
      expandBtn[i].addEventListener("click", function () {
        var content = this.nextElementSibling;
        if (content.style.maxHeight) {
          content.style.maxHeight = null;
          this.querySelector('svg').classList.add('expand-icon__right');
          this.querySelector('svg').classList.remove('expand-icon__down');
        } else {
          content.style.maxHeight = content.scrollHeight + "px";
          this.querySelector('svg').classList.remove('expand-icon__right');
          this.querySelector('svg').classList.add('expand-icon__down');
        }
      });
    }
    // ============================================================


    // ========================== scroll ==========================
    var lastScrollTop = window.pageYOffset || document.documentElement.scrollTop;
    var tocElem = document.querySelector('.toc');
    var tableOfContentsElem = tocElem ? tocElem.querySelector('#TableOfContents') : null;
    var toggleTocElem = document.getElementById('toggle-toc');
    var singleContentsElem = document.querySelector('.single__contents');
    var navbar = document.querySelector('.navbar');
    var tocFlexbox = document.querySelector('.toc__flexbox');
    var tocFlexboxOuter = document.querySelector('.toc__flexbox--outer');
    var expandContents = document.querySelectorAll('.expand__content');
    var boxContents = document.querySelectorAll('.box');
    var notAllowedTitleIds = null;

    {{ $tocFolding := $.Param "tocFolding" }}
    var tocFolding = JSON.parse({{ $tocFolding | jsonify }});
    {{ $tocLevels := ($.Param "tocLevels") }}
    var tocLevels = JSON.parse({{ $tocLevels | jsonify }});
    
    if (tocLevels) {
      tocLevels = tocLevels.toString();
    } else {
      tocLevels = "h1, h2, h3, h4, h5, h6";
    }

    // tab
    singleContentsElem && singleContentsElem.querySelectorAll(".tab") ?
    singleContentsElem.querySelectorAll(".tab").forEach(function (elem) {
      elem.querySelectorAll(tocLevels).forEach(function (element) {
        notAllowedTitleIds = Array.isArray(notAllowedTitleIds) ?
          notAllowedTitleIds.concat(element.getAttribute('id')) :
          [element.getAttribute('id')];
      });
    }) : null;

    // expand
    expandContents ? expandContents.forEach(function(elem) {
      elem.querySelectorAll(tocLevels).forEach(function (element) {
        notAllowedTitleIds = Array.isArray(notAllowedTitleIds) ?
          notAllowedTitleIds.concat(element.getAttribute('id')) :
          [element.getAttribute('id')];
      });
    }) : null;

    // box
    boxContents ? boxContents.forEach(function(elem) {
      elem.querySelectorAll(tocLevels).forEach(function (element) {
        notAllowedTitleIds = Array.isArray(notAllowedTitleIds) ?
          notAllowedTitleIds.concat(element.getAttribute('id')) :
          [element.getAttribute('id')];
      });
    }) : null;

    
    window.onscroll = function () {
      scrollFunction();
      
      var st = window.pageYOffset || document.documentElement.scrollTop;
      if (st > lastScrollTop) { // scroll down
        if (st < 250) {
          gttBtn.style.display = "none";
        } else {
          gttBtn.style.display = "block";
        }

        if (st < 45) {
          return null;
        }

        if (navbar.classList.contains('scrolling')) {
          if (!navbar.classList.contains('navbar--hide')) {
            navbar.classList.add('navbar--hide');
          } else if (navbar.classList.contains('navbar--show')) {
            navbar.classList.remove('navbar--show');
          }
        }

        if (singleContentsElem) {
          if (singleContentsElem.querySelectorAll(tocLevels).length > 0) {
            singleContentsElem.querySelectorAll(tocLevels).forEach(function (elem) {
              if (toggleTocElem && !toggleTocElem.checked) {
                return null;
              }

              if (notAllowedTitleIds && notAllowedTitleIds.includes(elem.getAttribute('id'))) {
                return null;
              }
              
              if (document.documentElement.scrollTop >= elem.offsetTop) {
                if (tableOfContentsElem) {
                  var id = elem.getAttribute('id');
                  tocElem.querySelectorAll('a').forEach(function (elem) {
                    elem.classList.remove('active');
                  });
                  tocElem.querySelector('a[href="#' + id + '"]') ?
                    tocElem.querySelector('a[href="#' + id + '"]').classList.add('active') : null;

                  if (false === tocFolding) {
                    
                  } else {
                    tableOfContentsElem.querySelectorAll('ul') ?
                      tableOfContentsElem.querySelectorAll('ul').forEach(function (rootUl) {
                        rootUl.querySelectorAll('li').forEach(function (liElem) {
                          liElem.querySelectorAll('ul').forEach(function (ulElem) {
                            ulElem.style.display = 'none';
                          });
                        });
                      }) : null;
                  }

                  var curElem = tableOfContentsElem.querySelector("[href='#" + id + "']");
                  if (curElem && curElem.nextElementSibling) {
                    curElem.nextElementSibling.style.display = 'block';
                  }
                  getParents(curElem, 'ul') ?
                    getParents(curElem, 'ul').forEach(function (elem) {
                      elem.style.display = 'block';
                    }) : null;
                }
              }
            });
          } else {
            if (tocFlexbox) {
              tocFlexbox.setAttribute('data-position', '');
              if (!tocFlexbox.classList.contains('hide')) {
                tocFlexbox.classList.add('hide');
              }
            }
            if (tocFlexboxOuter) {
              tocFlexboxOuter.setAttribute('data-position', '');
              if (!tocFlexboxOuter.classList.contains('hide')) {
                tocFlexboxOuter.classList.add('hide');
              }
            }
          }
        }
      } else { // scroll up
        if (st < 250) {
          gttBtn.style.display = "none";
        }

        if (navbar.classList.contains('scrolling')) {
          if (navbar.classList.contains('navbar--hide')) {
            navbar.classList.remove('navbar--hide');
          } else if (!navbar.classList.contains('navbar--show')) {
            navbar.classList.add('navbar--show');
          }
        }

        if (singleContentsElem) {
          if (singleContentsElem.querySelectorAll(tocLevels).length > 0) {
            singleContentsElem.querySelectorAll(tocLevels).forEach(function (elem) {
              if (toggleTocElem && !toggleTocElem.checked) {
                return null;
              }
              
              if (notAllowedTitleIds && notAllowedTitleIds.includes(elem.getAttribute('id'))) {
                return null;
              }

              if (document.documentElement.scrollTop >= elem.offsetTop) {
                if (tableOfContentsElem) {
                  var id = elem.getAttribute('id');
                  tocElem.querySelectorAll('a').forEach(function (elem) {
                    elem.classList.remove('active');
                  });
                  tocElem.querySelector('a[href="#' + id + '"]') ?
                    tocElem.querySelector('a[href="#' + id + '"]').classList.add('active') : null;

                  if (false === tocFolding) {
                    
                  } else {
                    tableOfContentsElem.querySelectorAll('ul') ?
                      tableOfContentsElem.querySelectorAll('ul').forEach(function (rootUl) {
                        rootUl.querySelectorAll('li').forEach(function (liElem) {
                          liElem.querySelectorAll('ul').forEach(function (ulElem) {
                            ulElem.style.display = 'none';
                          });
                        });
                      }) : null;
                  }

                  var curElem = tableOfContentsElem.querySelector("[href='#" + id + "']");
                  if (curElem && curElem.nextElementSibling) {
                    curElem.nextElementSibling.style.display = 'block';
                  }
                  getParents(curElem, 'ul') ?
                    getParents(curElem, 'ul').forEach(function (elem) {
                      elem.style.display = 'block';
                    }) : null;
                }
              }
            });
          } else {
            if (tocFlexbox && !tocFlexbox.classList.contains('hide')) {
              tocFlexbox.classList.add('hide');
            }
            if (tocFlexboxOuter && !tocFlexboxOuter.classList.contains('hide')) {
              tocFlexboxOuter.classList.add('hide');
            }
          }
          
        }

        if (tableOfContentsElem && document.documentElement.scrollTop < 250) {
          if (false === tocFolding) {

          } else {
            tableOfContentsElem.querySelector('ul') ?
              tableOfContentsElem.querySelector('ul').querySelectorAll('li').forEach(function (liElem) {
                liElem.querySelectorAll('ul').forEach(function (ulElem) {
                  ulElem.style.display = 'none';
                });
              }) : null;
          }
        }
      }
      lastScrollTop = st <= 0 ? 0 : st;
    };
  // ============================================================


  // ======================= theme change =======================
    var localTheme = localStorage.getItem('theme');
    var rootEleme = document.getElementById('root');
    var selectThemeElem = document.querySelectorAll('.select-theme');
    var selectThemeItemElem = document.querySelectorAll('.select-theme__item');
    
    {{ $skinDarkCode := (i18n "skin-dark") }}
    var skinDarkCode = JSON.parse({{ $skinDarkCode | jsonify }});
    {{ $skinLightCode := (i18n "skin-light") }}
    var skinLightCode = JSON.parse({{ $skinLightCode | jsonify }});
    {{ $skinHackerCode := (i18n "skin-hacker") }}
    var skinHackerCode = JSON.parse({{ $skinHackerCode | jsonify }});
    {{ $skinSolarizedCode := (i18n "skin-solarized") }}
    var skinSolarizedCode = JSON.parse({{ $skinSolarizedCode | jsonify }});
    {{ $skinKimbieCode := (i18n "skin-kimbie") }}
    var skinKimbieCode = JSON.parse({{ $skinKimbieCode | jsonify }});

    var setMetaColor = function(themeColor) {
      var metaMsapplicationTileColor = document.getElementsByName('msapplication-TileColor')[0];
      var metaThemeColor = document.getElementsByName('theme-color')[0];
      var metaMsapplicationNavbuttonColor = document.getElementsByName('msapplication-navbutton-color')[0];
      var metaAppleMobileWebAappStatusBarStyle = document.getElementsByName('apple-mobile-web-app-status-bar-style')[0];

      if (themeColor.includes('dark')) {
        metaMsapplicationTileColor.setAttribute('content', '#fcfcfa');
        metaThemeColor.setAttribute('content', '#403E41');
        metaMsapplicationNavbuttonColor.setAttribute('content', '#403E41');
        metaAppleMobileWebAappStatusBarStyle.setAttribute('content', '#403E41');
      } else if (themeColor.includes('light')) {
        metaMsapplicationTileColor.setAttribute('content', '#555');
        metaThemeColor.setAttribute('content', '#eee');
        metaMsapplicationNavbuttonColor.setAttribute('content', '#eee');
        metaAppleMobileWebAappStatusBarStyle.setAttribute('content', '#eee');
      } else if (themeColor.includes('hacker')) {
        metaMsapplicationTileColor.setAttribute('content', '#e3cd26');
        metaThemeColor.setAttribute('content', '#252526');
        metaMsapplicationNavbuttonColor.setAttribute('content', '#252526');
        metaAppleMobileWebAappStatusBarStyle.setAttribute('content', '#252526');
      } else if (themeColor.includes('solarized')) {
        metaMsapplicationTileColor.setAttribute('content', '#d3af86');
        metaThemeColor.setAttribute('content', '#51412c');
        metaMsapplicationNavbuttonColor.setAttribute('content', '#51412c');
        metaAppleMobileWebAappStatusBarStyle.setAttribute('content', '#51412c');
      } else if (themeColor.includes('kimbie')) {
        metaMsapplicationTileColor.setAttribute('content', '#586e75');
        metaThemeColor.setAttribute('content', '#eee8d5');
        metaMsapplicationNavbuttonColor.setAttribute('content', '#eee8d5');
        metaAppleMobileWebAappStatusBarStyle.setAttribute('content', '#eee8d5');
      }
    }

    var parseSkinCode = function(themeText) {
      if (themeText === skinDarkCode) {
        return 'dark';
      } else if (themeText === skinLightCode) {
        return 'light';
      } else if (themeText === skinHackerCode) {
        return 'hacker';
      } else if (themeText === skinSolarizedCode) {
        return 'solarized';
      } else if (themeText === skinKimbieCode) {
        return 'kimbie';
      }
    }
    
    if (localTheme) {
      selectThemeItemElem ? 
      selectThemeItemElem.forEach(function (elem) {
        if (elem.text.trim() === localTheme) {
          elem.classList.add('is-active');
        } else {
          elem.classList.remove('is-active');
        }
      }) : null;

      setMetaColor(localTheme);
    } else {
      setMetaColor(rootEleme.className);
    }

    selectThemeItemElem ? 
    selectThemeItemElem.forEach(function (v, i) {
      v.addEventListener('click', function (e) {
        var selectedThemeVariant = parseSkinCode(e.target.text.trim());
        localStorage.setItem('theme', selectedThemeVariant);
        setMetaColor(selectedThemeVariant);

        rootEleme.removeAttribute('class');
        rootEleme.classList.add('theme__' + selectedThemeVariant);
        selectThemeElem.forEach(function(rootElem) {
          rootElem.querySelectorAll('a').forEach(function (elem) {
            if (elem.classList) {
              if (elem.text.trim() === selectedThemeVariant) {
                if (!elem.classList.contains('is-active')) {
                  elem.classList.add('is-active');
                }
              } else {
                if (elem.classList.contains('is-active')) {
                  elem.classList.remove('is-active');
                }
              }
            }
          });
        });

        if (window.mermaid) {
          if (selectedThemeVariant === "dark" || selectedThemeVariant === "hacker") {
            mermaid.initialize({ theme: 'dark' });
            location.reload();
          } else {
            mermaid.initialize({ theme: 'default' });
            location.reload();
          }
        }

        var utterances = document.getElementById('utterances');
        if (utterances) {
          utterances.querySelector('iframe').contentWindow.postMessage({
            type: 'set-theme',
            theme: selectedThemeVariant === "dark" || selectedThemeVariant === "hacker" ? 'photon-dark' : selectedThemeVariant === 'kimbie' ? 'github-dark-orange' : 'github-light',
          }, 'https://utteranc.es');
        }

        var twitterCards = document.querySelectorAll('.twitter-timeline');
        if (twitterCards) {
          window.postMessage({
            type: 'set-twitter-theme',
            theme: selectedThemeVariant === 'light' || selectedThemeVariant === 'solarized' ? 'light' : 'dark',
          });
        }
      });
    }) : null;
  // ============================================================


  // ========================== search ==========================
    {{ $baseurl := $.Site.BaseURL }}
    var baseurl = JSON.parse({{ $baseurl | jsonify }});
    {{ $permalink := .Permalink }}
    var permalink = JSON.parse({{ $permalink | jsonify }});
    {{ $langprefix := $.Site.LanguagePrefix }}
    var langprefix = JSON.parse({{ $langprefix | jsonify }});
    var searchResults = null;
    var searchMenu = null;
    var searchText = null;
    
    {{ $enableSearch := ($.Param "enableSearch") }}
    var enableSearch = JSON.parse({{ $enableSearch | jsonify }});
    {{ $enableSearchHighlight := ($.Param "enableSearchHighlight") }}
    var enableSearchHighlight = JSON.parse({{ $enableSearchHighlight | jsonify }});
    {{ $searchResultPosition := ($.Param "searchResultPosition") }}
    var searchResultPosition = JSON.parse({{ $searchResultPosition | jsonify }});
    {{ $sectionType := .Type }}
    var sectionType = JSON.parse({{ $sectionType | jsonify }});
    {{ $kind := .Kind }}
    var kind = JSON.parse({{ $kind | jsonify }});
    
    var fuse = null;

    if (enableSearch) {
      (function initFuse() {
        var xhr = new XMLHttpRequest();
        if (sectionType === "publication" && kind !== "page") {
          xhr.open('GET', permalink + "index.json");
        } else {
          xhr.open('GET', baseurl + langprefix + "/index.json");
        }
        
        xhr.setRequestHeader('Content-Type', 'application/json; charset=utf-8');
        xhr.onload = function () {
          if (xhr.status === 200) {
            fuse = new Fuse(JSON.parse(xhr.response.toString('utf-8')), {
              keys: sectionType.includes('publication') ? ['title', 'abstract'] : ['title', 'description', 'content'],
              includeMatches: enableSearchHighlight,
              shouldSort: true, // default: true
              threshold: 0.4, // default: 0.6 (0.0 requires a perfect match)
              location: 0, // default: 0
              distance: 100, // default: 100
              maxPatternLength: 32,
              minMatchCharLength: 1,
              isCaseSensitive: false, // defualt: false
              findAllMatches: false, // default: false
              useExtendedSearch: false, // default: false
            });
            window.fuse = fuse;
          }
          else {
            console.error('[' + xhr.status + ']Error:', xhr.statusText);
          }
        };
        xhr.send();
      })();
    }

    function makeLi(ulElem, obj) {
      var li = document.createElement('li');
      li.className = 'search-result__item';
      
      var a = document.createElement('a');
      a.innerHTML = obj.item.title;
      a.setAttribute('class', 'search-result__item--title');
      a.setAttribute('href', obj.item.permalink);

      var descDiv = document.createElement('div');
      descDiv.setAttribute('class', 'search-result__item--desc');
      if (obj.item.description) {
        descDiv.innerHTML = obj.item.description;
      } else if (obj.item.content) {
        descDiv.innerHTML = obj.item.content.substring(0, 225);
      }
      
      li.appendChild(a);
      li.appendChild(descDiv);
      ulElem.appendChild(li);
    }

    function makeHighlightLi(ulElem, obj) {
      var li = document.createElement('li');
      li.className = 'search-result__item';
      var descDiv = null;

      var a = document.createElement('a');
      a.innerHTML = obj.item.title;
      a.setAttribute('class', 'search-result__item--title');
      a.setAttribute('href', obj.item.uri);

      if (obj.matches && obj.matches.length) {
        for (var i = 0; i < obj.matches.length; i++) {
          if ('title' === obj.matches[i].key) {
            a = document.createElement('a');
            a.innerHTML = generateHighlightedText(obj.matches[i].value, obj.matches[i].indices);
            a.setAttribute('class', 'search-result__item--title');
            a.setAttribute('href', obj.item.uri);
          }
          
          if ('description' === obj.matches[i].key) {
            descDiv = document.createElement('div');
            descDiv.setAttribute('class', 'search-result__item--desc');
            descDiv.innerHTML = generateHighlightedText(obj.item.description, obj.matches[i].indices);
          } else if ('content' === obj.matches[i].key) {
            if (!descDiv) {
              descDiv = document.createElement('div');
              descDiv.setAttribute('class', 'search-result__item--desc');
              descDiv.innerHTML = generateHighlightedText(obj.item.content.substring(0, 150), obj.matches[i].indices);
            }
          } else {
            if (obj.item.description) {
              descDiv = document.createElement('div');
              descDiv.setAttribute('class', 'search-result__item--desc');
              descDiv.innerHTML = obj.item.description;
            } else {
              descDiv = document.createElement('div');
              descDiv.setAttribute('class', 'search-result__item--desc');
              descDiv.innerHTML = obj.item.content.substring(0, 150);
            }
          }
        }

        li.appendChild(a);
        if (descDiv) {
          li.appendChild(descDiv);
        }
        if (li) {
          ulElem.appendChild(li);
        }
      }
    }

    function renderSearchResultsSide(searchText, results) {
      searchResults = document.getElementById('search-results');
      searchMenu = document.getElementById('search-menu');
      searchResults.setAttribute('class', 'dropdown is-active');
      
      var ul = document.createElement('ul');
      ul.setAttribute('class', 'dropdown-content search-content');

      if (results.length) {
        results.forEach(function (result) {
          var li = document.createElement('li');
          var a = document.createElement('a');
          a.setAttribute('href', result.uri);
          a.setAttribute('class', 'dropdown-item');
          a.appendChild(li);

          var titleDiv = document.createElement('div');
          titleDiv.innerHTML = result.title;
          titleDiv.setAttribute('class', 'menu-item__title');

          var descDiv = document.createElement('div');
          descDiv.setAttribute('class', 'menu-item__desc');
          if (result.description) {
            descDiv.innerHTML = result.description;
          } else if (result.content) {
            descDiv.innerHTML = result.content.substring(0, 150);
          }

          li.appendChild(titleDiv);
          li.appendChild(descDiv);
          ul.appendChild(a);
        });
      } else {
        var li = document.createElement('li');
        li.setAttribute('class', 'dropdown-item');
        li.innerText = 'No results found';
        ul.appendChild(li);
      }

      while (searchMenu.hasChildNodes()) {
        searchMenu.removeChild(
          searchMenu.lastChild
        );
      }
      
      searchMenu.appendChild(ul);
    }

    function renderSearchHighlightResultsSide(searchText, results) {
      searchResults = document.getElementById('search-results');
      searchMenu = document.getElementById('search-menu');
      searchResults.setAttribute('class', 'dropdown is-active');

      var ul = document.createElement('ul');
      ul.setAttribute('class', 'dropdown-content search-content');

      if (results.length) {
        results.forEach(function (result) {
          var li = document.createElement('li');
          var a = document.createElement('a');
          var descDiv = null;

          a.setAttribute('href', result.item.uri);
          a.setAttribute('class', 'dropdown-item');
          a.appendChild(li);

          var titleDiv = document.createElement('div');
          titleDiv.innerHTML = result.item.title;
          titleDiv.setAttribute('class', 'menu-item__title');
          
          if (result.matches && result.matches.length) {
            for (var i = 0; i < result.matches.length; i++) {
              if ('title' === result.matches[i].key) {
                titleDiv.innerHTML = generateHighlightedText(result.matches[i].value, result.matches[i].indices);
              }

              if ('description' === result.matches[i].key) {
                descDiv = document.createElement('div');
                descDiv.setAttribute('class', 'menu-item__desc');
                descDiv.innerHTML = generateHighlightedText(result.item.description, result.matches[i].indices);
              } else if ('content' === result.matches[i].key) {
                if (!descDiv) {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'menu-item__desc');
                  descDiv.innerHTML = generateHighlightedText(result.item.content.substring(0, 150), result.matches[i].indices);
                }
              } else {
                if (result.item.description) {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'menu-item__desc');
                  descDiv.innerHTML = result.item.description;
                } else {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'menu-item__desc');
                  descDiv.innerHTML = result.item.content.substring(0, 150);
                }
              }
            }
            
            li.appendChild(titleDiv);
            if (descDiv) {
              li.appendChild(descDiv);
            }
            ul.appendChild(a);
          }
        });
      } else {
        var li = document.createElement('li');
        li.setAttribute('class', 'dropdown-item');
        li.innerText = 'No results found';
        ul.appendChild(li);
      }

      while (searchMenu.hasChildNodes()) {
        searchMenu.removeChild(
          searchMenu.lastChild
        );
      }
      searchMenu.appendChild(ul);
    }

    function renderSearchResultsMobile(searchText, results) {
      searchResults = document.getElementById('search-mobile-results');

      var content = document.createElement('div');
      content.setAttribute('class', 'mobile-search__content');

      if (results.length > 0) {
        results.forEach(function (result) {
          var item = document.createElement('a');
          item.setAttribute('href', result.uri);
          item.innerHTML = '<div class="mobile-search__item"><div class="mobile-search__item--title">📄 ' + result.title + '</div><div class="mobile-search__item--desc">' + (result.description ? result.description : result.content) + '</div></div>';
          content.appendChild(item);
        });
      } else {
        var item = document.createElement('span');
        content.appendChild(item);
      }

      let wrap = document.getElementById('search-mobile-results');
      while (wrap.firstChild) {
        wrap.removeChild(wrap.firstChild)
      }
      searchResults.appendChild(content);      
    }

    function renderSearchHighlightResultsMobile(searchText, results) {
      searchResults = document.getElementById('search-mobile-results');

      var ul = document.createElement('div');
      ul.setAttribute('class', 'mobile-search__content');

      if (results.length) {
        results.forEach(function (result) {
          var li = document.createElement('li');
          var a = document.createElement('a');
          var descDiv = null;

          a.setAttribute('href', result.item.uri);
          a.appendChild(li);
          li.setAttribute('class', 'mobile-search__item');

          var titleDiv = document.createElement('div');
          titleDiv.innerHTML = result.item.title;
          titleDiv.setAttribute('class', 'mobile-search__item--title');
          
          if (result.matches && result.matches.length) {
            for (var i = 0; i < result.matches.length; i++) {
              if ('title' === result.matches[i].key) {
                titleDiv.innerHTML = generateHighlightedText(result.matches[i].value, result.matches[i].indices);
              }

              if ('description' === result.matches[i].key) {
                descDiv = document.createElement('div');
                descDiv.setAttribute('class', 'mobile-search__item--desc');
                descDiv.innerHTML = generateHighlightedText(result.item.description, result.matches[i].indices);
              } else if ('content' === result.matches[i].key) {
                if (!descDiv) {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'mobile-search__item--desc');
                  descDiv.innerHTML = generateHighlightedText(result.item.content.substring(0, 150), result.matches[i].indices);
                }
              } else {
                if (result.item.description) {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'mobile-search__item--desc');
                  descDiv.innerHTML = result.item.description;
                } else {
                  descDiv = document.createElement('div');
                  descDiv.setAttribute('class', 'mobile-search__item--desc');
                  descDiv.innerHTML = result.item.content.substring(0, 150);
                }
              }
            }
            
            li.appendChild(titleDiv);
            if (descDiv) {
              li.appendChild(descDiv);
            }
            ul.appendChild(a);
          }
        });
      } else {
        var item = document.createElement('span');
        ul.appendChild(item);
      }

      let wrap = document.getElementById('search-mobile-results');
      while (wrap.firstChild) {
        wrap.removeChild(wrap.firstChild)
      }
      searchResults.appendChild(ul);
    }

    function generateHighlightedText(text, regions) {
      if (!regions) {
        return text;
      }

      var content = '', nextUnhighlightedRegionStartingIndex = 0;

      regions.forEach(function(region) {
        if (region[0] === region[1]) {
          return null;
        }
        
        content += '' +
          text.substring(nextUnhighlightedRegionStartingIndex, region[0]) +
          '<span class="search__highlight">' +
            text.substring(region[0], region[1] + 1) +
          '</span>' +
        '';
        nextUnhighlightedRegionStartingIndex = region[1] + 1;
      });

      content += text.substring(nextUnhighlightedRegionStartingIndex);

      return content;
    };

    var searchElem = document.getElementById('search');
    var searchMobile = document.getElementById('search-mobile');
    var searchResultsContainer = document.getElementById('search-results');

    searchElem ?
    searchElem.addEventListener('input', function(e) {
      if (!e.target.value | window.innerWidth < 770) {
        searchResultsContainer ? searchResultsContainer.setAttribute('class', 'dropdown') : null;
        searchResult ? searchResult.setAttribute('data-display', 'none') : null;
        summaryContainer ? summaryContainer.setAttribute('data-display', 'block') : null;
        return null;
      }

      searchText = e.target.value;
      var results = fuse.search(e.target.value);
      
      if (searchResultPosition === "main") {
        if (enableSearchHighlight) {
          renderSearchHighlightResultsMain(searchText, results);
        } else {
          renderSearchResultsMain(searchText, results);
        }
      } else {
        if (enableSearchHighlight) {
          renderSearchHighlightResultsSide(searchText, results);
        } else {
          renderSearchResultsSide(searchText, results);
        }
        
        var dropdownItems = searchResultsContainer.querySelectorAll('.dropdown-item');
        dropdownItems ? dropdownItems.forEach(function(item) {
          item.addEventListener('mousedown', function(e) {
            e.target.click();
          });
        }) : null;
      }
    }) : null;

    searchElem ? 
    searchElem.addEventListener('blur', function() {
      if (window.innerWidth < 770) {
        return null;
      }
      searchResultsContainer ? searchResultsContainer.setAttribute('class', 'dropdown') : null;
    }) : null;

    searchElem ? 
    searchElem.addEventListener('click', function(e) {
      if (window.innerWidth < 770) {
        return null;
      }
      if (!e.target.value) {
        searchResultsContainer ? searchResultsContainer.setAttribute('class', 'dropdown') : null;
        return null;
      }

      searchText = e.target.value;
      var results = fuse.search(e.target.value);

      if (searchResultPosition === "main") {
        if (enableSearchHighlight) {
          renderSearchHighlightResultsMain(searchText, results);
        } else {
          renderSearchResultsMain(searchText, results);
        }
      } else{
        if (enableSearchHighlight) {
          renderSearchHighlightResultsSide(searchText, results);
        } else {
          renderSearchResultsSide(searchText, results);
        }

        var dropdownItems = searchResultsContainer.querySelectorAll('.dropdown-item');
        dropdownItems ? dropdownItems.forEach(function (item) {
          item.addEventListener('mousedown', function (e) {
            e.target.click();
          });
        }) : null;
      }
    }) : null;

    var searchMenuElem = document.getElementById("search-menu");
    var activeItem = document.querySelector('#search-menu .dropdown-item.is-active');
    var activeIndex = null;
    var items = null;
    var searchContainerMaxHeight = 350;

    searchElem ? 
    searchElem.addEventListener('keydown', function(e) {
      if (window.innerWidth < 770) {
        return null;
      }

      if (e.key === 'Escape') {
        searchResult ? searchResult.setAttribute('data-display', 'none') : null;
        summaryContainer ? summaryContainer.setAttribute('data-display', 'block') : null;
      }

      var items = document.querySelectorAll('#search-menu .dropdown-item');
      var keyCode = e.which || e.keyCode;

      if (!items || !items.length) {
        return null;
      }
      
      if (e.key === 'ArrowDown' || keyCode === 40) {
        if (activeIndex === null) {
          activeIndex = 0;
          items[activeIndex].classList.remove('is-active');
        } else {
          items[activeIndex].classList.remove('is-active');
          activeIndex = activeIndex === items.length - 1 ? 0 : activeIndex + 1;
        }
        items[activeIndex].classList.add('is-active');

        let overflowedPixel = items[activeIndex].offsetTop + items[activeIndex].clientHeight - searchContainerMaxHeight;
        if (overflowedPixel > 0) {
          document.querySelector(".search-content").scrollTop += items[activeIndex].getBoundingClientRect().height;
        } else if (activeIndex === 0) {
          document.querySelector(".search-content").scrollTop = 0;
        }
      } else if (e.key === 'ArrowUp' || keyCode === 38) {
        if (activeIndex === null) {
          activeIndex = items.length - 1;
          items[activeIndex].classList.remove('is-active');
        } else {
          items[activeIndex].classList.remove('is-active');
          activeIndex = activeIndex === 0 ? items.length - 1 : activeIndex - 1;
        }
        items[activeIndex].classList.add('is-active');
        
        let overflowedPixel = items[activeIndex].offsetTop + items[activeIndex].clientHeight - searchContainerMaxHeight;
        if (overflowedPixel < 0) {
          document.querySelector(".search-content").scrollTop -= items[activeIndex].getBoundingClientRect().height;
        } else {
          document.querySelector(".search-content").scrollTop = overflowedPixel + items[activeIndex].getBoundingClientRect().height;
        }
      } else if (e.key === 'Enter' || keyCode === 13) {
        if (items[activeIndex] && items[activeIndex].getAttribute('href')) {
          location.href = items[activeIndex].getAttribute('href');
        }
      } else if (e.key === 'Escape' || keyCode === 27) {
        e.target.value = null;
        if (searchResults) {
          searchResults.classList.remove('is-active');
        }
      }
    }) : null;

    searchMobile ? 
    searchMobile.addEventListener('input', function(e) {
      if (!e.target.value) {
        let wrap = document.getElementById('search-mobile-results');
        while (wrap.firstChild) {
          wrap.removeChild(wrap.firstChild);
        }
        return null;
      }

      searchText = e.target.value;
      var results = fuse.search(e.target.value);
      renderSearchResultsMobile(searchText, results);
      if (enableSearchHighlight) {
        renderSearchHighlightResultsMobile(searchText, results);
      } else {
        renderSearchResultsMobile(searchText, results);
      }
    }) : null;
  // ============================================================


  // ====================== mobile search =======================
    var mobileSearchInputElem = document.querySelector('#search-mobile');
    var mobileSearchClassElem = document.querySelector('.mobile-search');
    var mobileSearchBtnElems = document.querySelectorAll('.navbar-search');
    var mobileSearchCloseBtnElem = document.querySelector('#search-mobile-close');
    var mobileSearchContainer = document.querySelector('#search-mobile-container');
    var mobileSearchResultsElem = document.querySelector('#search-mobile-results');
    var htmlElem = document.querySelector('html');

    if (mobileSearchClassElem) {
      mobileSearchClassElem.style.display = 'none';
    }

    mobileSearchBtnElems ? 
    mobileSearchBtnElems.forEach(function (elem, idx) {
      elem.addEventListener('click', function () {
        if (mobileSearchContainer) {
          mobileSearchContainer.style.display = 'block';
        }

        if (mobileSearchInputElem) {
          mobileSearchInputElem.focus();
        }

        if (htmlElem) {
          htmlElem.style.overflowY = 'hidden';
        }
      });
    }) : null;

    mobileSearchCloseBtnElem ? 
    mobileSearchCloseBtnElem.addEventListener('click', function() {
      if (mobileSearchContainer) {
        mobileSearchContainer.style.display = 'none';
      }

      if (mobileSearchInputElem) {
        mobileSearchInputElem.value = '';
      }
      
      if (mobileSearchResultsElem) {
        while (mobileSearchResultsElem.firstChild) {
          mobileSearchResultsElem.removeChild(mobileSearchResultsElem.firstChild);
        }
      }

      if (htmlElem) {
        htmlElem.style.overflowY = 'visible';
      }
    }) : null;

    mobileSearchInputElem ?
    mobileSearchInputElem.addEventListener('keydown', function(e) {
      var keyCode = e.which || e.keyCode;
      if (e.key === 'Escape' || keyCode === 27) {
        if (mobileSearchContainer) {
          mobileSearchContainer.style.display = 'none';
        }
        
        if (mobileSearchInputElem) {
          mobileSearchInputElem.value = '';
        }

        if (mobileSearchResultsElem) {
          while (mobileSearchResultsElem.firstChild) {
            mobileSearchResultsElem.removeChild(mobileSearchResultsElem.firstChild);
          }
        }
        if (htmlElem) {
          htmlElem.style.overflowY = 'visible';
        }
      }
    }) : null;
  // ============================================================


  // =================== search-result desktop ==================
    function renderSearchResultsMain(searchText, results) {
      var searchBody = document.querySelector('.search-result__body');
      var originUl = searchBody.querySelector('ul');
      var ul = document.createElement('ul');
      
      if (!searchText) {
        searchResult ? searchResult.setAttribute('data-display', 'none') : null;
        summaryContainer ? summaryContainer.setAttribute('data-display', 'block') : null;
      } else if (results) {
        if (results && results.length) {
          results.forEach(function (result) {
            makeLi(ul, result);
          });

          searchResult ? searchResult.setAttribute('data-display', 'block') : null;
          summaryContainer ? summaryContainer.setAttribute('data-display', 'none') : null;
        }
      }

      originUl.parentNode.replaceChild(ul, originUl);
    }

    function renderSearchHighlightResultsMain(searchText, results) {
      var searchBody = document.querySelector('.search-result__body');
      var originUl = searchBody.querySelector('ul');
      var ul = document.createElement('ul');

      if (!searchText) {
        searchResult ? searchResult.setAttribute('data-display', 'none') : null;
        summaryContainer ? summaryContainer.setAttribute('data-display', 'block') : null;
      } else if (results) {
        if (results && results.length) {
          results.forEach(function (result) {
            makeHighlightLi(ul, result);
          });

          searchResult ? searchResult.setAttribute('data-display', 'block') : null;
          summaryContainer ? summaryContainer.setAttribute('data-display', 'none') : null;
        }
      }

      originUl.parentNode.replaceChild(ul, originUl);
    }
  // ============================================================
  });
</script>