{{ $js := .Site.Data.lib.js }}
{{ $css := .Site.Data.lib.css }}

{{ if in .Params.Libraries "mermaid" }}
  {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"mermaid\"></script>" $js.mermaid.url $js.mermaid.sri | safeHTML }}
  <script>
    {{ $themeVariant := (index .Site.Params.themeOptions 0) }}
    var themeVariant = localStorage.getItem('theme') || JSON.parse({{ $themeVariant | jsonify }});

    if (themeVariant === "dark" || themeVariant === "hacker") {
      mermaid.initialize({ theme: 'dark' });
    } else {
      mermaid.initialize({ theme: 'default' });
    }   

    // mermaid Fix Mermaid.js clash with Highlight.js.  
    let mermaids = [];
    [].push.apply(mermaids, document.getElementsByClassName('language-mermaid'));
    for (i = 0; i < mermaids.length; i++) {
      $(mermaids[i]).unwrap('pre');  // Remove <pre> wrapper.
      $(mermaids[i]).replaceWith(function () {
        // Convert <code> block to <div> and add `mermaid` class so that Mermaid will parse it.
        return $("<div />").append($(this).contents()).addClass('mermaid');
      });
    }
</script>
{{ end }}

{{ if in .Params.Libraries "katex" }}
  {{ printf "<link rel=\"stylesheet\" href=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\">" $css.katex.url $css.katex.sri | safeHTML }}
  {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"katex\"></script>" $js.katex.url $js.katex.sri | safeHTML }}
  {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"katex\"></script>" $js.katex_auto_render.url $js.katex_auto_render.sri | safeHTML }}
  <script>
    var mathElements = document.getElementsByClassName('math');
    var options = [
      { left: "$$", right: "$$", display: true },
      { left: "\\(", right: "\\)", display: false },
      { left: "\\[", right: "\\]", display: true }
    ];

    renderMathInElement(document.getElementsByClassName('single__contents')[0], options);
  </script>
{{ end }}

{{ if in .Params.Libraries "flowchartjs" }}
  {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"raphael\"></script>" $js.raphael.url $js.raphael.sri | safeHTML }}
  {{ printf "<script src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"flowchartjs\"></script>" $js.flowchartjs.url $js.flowchartjs.sri | safeHTML }}  
  
  <script>        
    {{ $flowchartjs := .Site.Data.flowchartjs }}
    var options = JSON.parse({{ $flowchartjs | jsonify }});

    $('.diagram').each(function() {
      var diagramContent = $(this).text(); 
      $(this).text('');

      var diagram = flowchart.parse(diagramContent);
      diagram.drawSVG('diagram', options);
    });    

  </script>
{{ end }}

{{ if in .Params.Libraries "mathjax" }}
{{ printf "<script async src=\"%s\" integrity=\"%s\" crossorigin=\"anonymous\" title=\"mathjax\"></script>" $js.mathjax.url $js.mathjax.sri | safeHTML }}
<script>
  window.MathJax = {
    tex: {
      inlineMath: [['$', '$'], ['\\(', '\\)']],
      displayMath: [['$$', '$$'], ['\\[', '\\]']],
      processEscapes: false,
      packages: { '[+]': ['noerrors'] }
    },
    loader: {
      load: ['[tex]/noerrors']
    },
  };
</script>
{{ end }}