{% extends "base.html" %}
{% block title %}{{ file }} · {{ name }} · The Booth{% endblock %}
{% block content %}
<div class="viewer">
  <div class="vbar">
    <a class="vbtn vx" href="/b/{{ name_url }}/" title="back to gallery (Esc)">✕</a>
    <span class="vname">{{ file }}</span>
    <span class="vspacer"></span>
    <span class="vtoggle" id="vtoggle" style="display:none">
      <button type="button" class="vseg on" id="btn-fit">Fit</button><button type="button" class="vseg" id="btn-one">1:1</button>
    </span>
    <a class="vbtn" href="{{ file_url }}" download title="download {{ file }}">⬇</a>
  </div>
  <div class="vstage fit" id="vstage"><img id="vimg" src="{{ file_url }}" alt="{{ file }}"></div>
</div>
<script>
  (function () {
    var img = document.getElementById('vimg');
    var stage = document.getElementById('vstage');
    var toggle = document.getElementById('vtoggle');
    var bFit = document.getElementById('btn-fit');
    var bOne = document.getElementById('btn-one');
    var BACK = {{ ('/b/' ~ name_url ~ '/')|tojson }};

    function setMode(mode) {
      var fit = mode === 'fit';
      stage.classList.toggle('fit', fit);
      stage.classList.toggle('one', !fit);
      bFit.classList.toggle('on', fit);
      bOne.classList.toggle('on', !fit);
    }
    // "fits" == the image at natural size already sits inside the stage, so Fit
    // and 1:1 would render identically — in that case we hide the toggle entirely.
    function fits() {
      return img.naturalWidth <= stage.clientWidth && img.naturalHeight <= stage.clientHeight;
    }
    function evaluate() {
      if (!img.naturalWidth) return;
      if (fits()) {
        toggle.style.display = 'none';
        setMode('fit');
      } else {
        toggle.style.display = 'inline-flex';
        if (!stage.classList.contains('one')) setMode('fit');
      }
    }
    bFit.addEventListener('click', function () { setMode('fit'); });
    bOne.addEventListener('click', function () { setMode('one'); });
    img.addEventListener('load', evaluate);
    window.addEventListener('resize', evaluate);
    if (img.complete) evaluate();
    document.addEventListener('keydown', function (e) {
      if (e.key === 'Escape') window.location.href = BACK;
    });
  })();
</script>
{% endblock %}