{% extends 'base.html' %}
{% block content %}
<h2 style="position:relative;">Theme Catalog <small id="theme-stale-indicator" style="display:none; font-size:12px; color:#b45309;">(Refreshing…)</small></h2>
<div id="theme-picker" class="theme-picker" hx-get="/themes/fragment/list?limit=20&offset=0" hx-trigger="load" hx-target="#theme-results" hx-swap="innerHTML" role="region" aria-label="Theme picker">
  <div class="theme-picker-controls">
    <input type="text" id="theme-search" placeholder="Search themes or synergies" aria-label="Search" 
      hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="debouncedinput change" name="q"
      data-hx-debounce="260" data-hx-debounce-events="input,keyup" data-hx-debounce-flush="blur" data-hx-debounce-group="theme-search" />
    <select id="theme-archetype" name="archetype" hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change">
      <option value="">All Archetypes</option>
      {% if archetypes %}{% for a in archetypes %}<option value="{{ a }}">{{ a }}</option>{% endfor %}{% endif %}
    </select>
    <select id="theme-bucket" name="bucket" hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change">
      <option value="">All Popularity</option>
      <option>Very Common</option>
      <option>Common</option>
      <option>Uncommon</option>
      <option>Niche</option>
      <option>Rare</option>
    </select>
    <select id="theme-limit" name="limit" hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change" title="Themes per page">
      <option value="20" selected>20</option>
      <option value="30">30</option>
      <option value="50">50</option>
      <option value="75">75</option>
      <option value="100">100</option>
    </select>
    <label title="Show full synergy list (diagnostics only)"><input type="checkbox" id="synergy-full" name="synergy_mode" value="full" hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change"/> Full Synergies</label>
    <label title="Search input responsiveness experiment">
      Mode:
      <select id="search-mode">
        <option value="throttle" selected>Throttle 250ms</option>
        <option value="debounce">Debounce 250ms</option>
      </select>
    </label>
    <div class="color-filters" role="group" aria-label="Filter by primary/secondary color">
      {% for c in ['W','U','B','R','G'] %}
      <label><input type="checkbox" name="colors" value="{{ c }}" 
        hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change"/> {{ c }}</label>
      {% endfor %}
    </div>
    {% if theme_picker_diagnostics %}
    <label title="Show diagnostics-only badges"><input type="checkbox" id="diag-toggle" name="diagnostics" value="1" hx-get="/themes/fragment/list" hx-target="#theme-results" hx-trigger="change"/> Diagnostics</label>
    {% endif %}
  </div>
  <div id="filter-chips" class="filter-chips" aria-label="Active filters" style="margin-bottom:.25rem;"></div>
  <div id="theme-results" class="theme-results preload-hide" aria-live="polite" aria-busy="true" role="listbox" aria-label="Loading themes">
    <div class="skeleton-table" aria-hidden="true">
      {% for i in range(6) %}
      <div class="skeleton-row skeleton-align">
        <div class="sk-cell sk-col sk-theme"></div>
        <div class="sk-cell sk-col sk-arch"></div>
        <div class="sk-cell sk-col sk-pop"></div>
        <div class="sk-cell sk-col sk-colors"></div>
        <div class="sk-cell sk-col sk-cnt"></div>
        <div class="sk-cell sk-col sk-synergies"></div>
      </div>
      {% endfor %}
    </div>
  </div>
  <template id="theme-row-template"></template>
  <div class="legend" style="margin-top:1rem; font-size:12px; line-height:1.3;">
    <strong>Legend:</strong>
    <span class="theme-badge badge-enforced" title="Enforced synergy (whitelist governance)">ENF</span>
    <span class="theme-badge badge-curated" title="Curated synergy (hand authored)">CUR</span>
    <span class="theme-badge badge-inferred" title="Inferred synergy (analytics)">INF</span>
    <span class="theme-badge badge-pop-vc" title="Popularity: Very Common">VC</span>
    <span class="theme-badge badge-pop-c" title="Popularity: Common">C</span>
    <span class="theme-badge badge-pop-u" title="Popularity: Uncommon">U</span>
    <span class="theme-badge badge-pop-n" title="Popularity: Niche">N</span>
    <span class="theme-badge badge-pop-r" title="Popularity: Rare">R</span>
    {% if theme_picker_diagnostics %}
    <span class="theme-badge badge-fallback" title="Generic fallback description">⚠</span>
    <span class="theme-badge badge-quality-draft" title="Editorial quality: draft">D</span>
    <span class="theme-badge badge-quality-reviewed" title="Editorial quality: reviewed">R</span>
    <span class="theme-badge badge-quality-final" title="Editorial quality: final">F</span>
    {% endif %}
  </div>
  <div id="theme-preview-host"></div>
</div>
<style>
.theme-picker-controls { display:flex; flex-wrap:wrap; gap:.5rem; margin-bottom:.75rem; }
.theme-results table { width:100%; border-collapse: collapse; }
.theme-results th, .theme-results td { padding:.35rem .5rem; border-bottom:1px solid var(--border); font-size:13px; }
.theme-results tr:hover { background: var(--hover); cursor:pointer; }
:root { --focus:#6366f1; }
@media (prefers-contrast: more){ :root { --focus:#ff9800; } }
.theme-row.is-active { outline:2px solid var(--focus); outline-offset:-2px; background:var(--hover); }
/* Long theme name truncation */
.theme-results td:first-child { max-width:260px; }
.theme-results td:first-child span.trunc-name { display:inline-block; max-width:240px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; vertical-align:bottom; }
/* Badge wrapping heuristics */
.theme-synergies .theme-badge { max-width:120px; overflow:hidden; text-overflow:ellipsis; }
.theme-synergies { font-size:11px; opacity:.85; display:flex; flex-wrap:wrap; gap:4px; }
.theme-badge { display:inline-block; padding:2px 6px; border-radius:12px; font-size:10px; background: var(--panel-alt); border:1px solid var(--border); letter-spacing:.5px; }
.badge-fallback { background:#7f1d1d; color:#fff; }
.badge-quality-draft { background:#4338ca; color:#fff; }
.badge-quality-reviewed { background:#065f46; color:#fff; }
.badge-quality-final { background:#065f46; color:#fff; font-weight:600; }
.badge-pop-vc { background:#065f46; color:#fff; }
.badge-pop-c { background:#047857; color:#fff; }
.badge-pop-u { background:#0369a1; color:#fff; }
.badge-pop-n { background:#92400e; color:#fff; }
.badge-pop-r { background:#7f1d1d; color:#fff; }
.badge-curated { background:#4f46e5; color:#fff; }
.badge-enforced { background:#334155; color:#fff; }
.badge-inferred { background:#57534e; color:#fff; }
/* Preview modal */
.preview-modal { position:fixed; inset:0; background:rgba(0,0,0,0.55); display:flex; align-items:flex-start; justify-content:center; padding:4vh 2vw; z-index:9000; }
.preview-modal-content { background:var(--panel); padding:1rem; border-radius:8px; max-width:900px; width:100%; max-height:88vh; overflow:auto; box-shadow:0 4px 18px rgba(0,0,0,0.4); }
/* Skeleton */
.skeleton-table { display:flex; flex-direction:column; gap:6px; }
.skeleton-row { display:grid; grid-template-columns:22% 10% 10% 12% 12% 1fr; gap:8px; align-items:center; }
.sk-cell { height:14px; background:linear-gradient(90deg, var(--panel-alt) 25%, var(--hover) 50%, var(--panel-alt) 75%); background-size:200% 100%; animation: sk 1.2s ease-in-out infinite; border-radius:4px; opacity:.7; }
.skeleton-align .sk-col { height:14px; }
.sk-synergies { height:18px; }
/* New UX additions */
.filter-chips { display:flex; gap:6px; flex-wrap:wrap; margin-top:.35rem; }
.filter-chip { background:var(--panel-alt); border:1px solid var(--border); padding:2px 8px; border-radius:14px; font-size:11px; cursor:pointer; display:inline-flex; align-items:center; gap:4px; }
.filter-chip button { background:none; border:none; color:inherit; cursor:pointer; font-size:11px; padding:0; line-height:1; }
mark { background:#fde68a; color:inherit; padding:0 2px; border-radius:2px; }
@keyframes sk {0%{background-position:0 0;}100%{background-position:-200% 0;}}
</style>
<script>
(function(){
  function serializeFilters(container){
    var params = [];
    var qs = container.querySelector('#theme-search');
    if(qs && qs.value.trim()){ params.push('q='+encodeURIComponent(qs.value.trim())); }
    var as = container.querySelector('#theme-archetype');
    if(as && as.value) params.push('archetype='+encodeURIComponent(as.value));
    var bs = container.querySelector('#theme-bucket');
    if(bs && bs.value) params.push('bucket='+encodeURIComponent(bs.value));
    var lim = container.querySelector('#theme-limit');
    if(lim && lim.value) params.push('limit='+encodeURIComponent(lim.value));
    var diag = container.querySelector('#diag-toggle');
    if(diag && diag.checked) params.push('diagnostics=1');
    var syFull = container.querySelector('#synergy-full');
    if(syFull && syFull.checked) params.push('synergy_mode=full');
    var colorChecks = container.querySelectorAll('input[name="colors"]:checked');
    if(colorChecks.length){
       var vals = Array.prototype.map.call(colorChecks, c=>c.value).join(',');
       params.push('colors='+encodeURIComponent(vals));
    }
    return params.join('&');
  }
  var perfMarks={}; function mark(n){ perfMarks[n]=performance.now(); }
  function fetchList(){
    saveScroll();
    var container = document.getElementById('theme-picker');
    if(!container) return;
    var target = document.getElementById('theme-results');
    if(!target) return;
    // Abort any in-flight request (resilience: rapid search)
    if(window.__themeListAbort){ try { window.__themeListAbort.abort(); } catch(_e){} }
    var controller = new AbortController();
    window.__themeListAbort = controller;
    target.setAttribute('aria-busy','true');
    target.setAttribute('aria-label','Loading themes');
    mark('list_render_start');
    var base = serializeFilters(container);
    if(base.indexOf('offset=') === -1){ base += (base ? '&' : '') + 'offset=0'; }
    toggleRefreshBtn(true);
    fetch('/themes/fragment/list?'+base, {cache:'no-store', signal: controller.signal})
      .then(r=>r.text())
      .then(html=>{
        if(controller.signal.aborted) return;
        target.innerHTML = html;
        if(window.htmx && typeof window.htmx.process==='function'){
          window.htmx.process(target);
        }
        target.removeAttribute('aria-busy');
        target.classList.remove('preload-hide');
        listRenderComplete();
        toggleRefreshBtn(false);
      })
      .catch(err=>{ if(controller.signal.aborted) return; target.innerHTML = '<div class="error" role="alert">Failed loading themes. <button id="retry-fetch" class="btn btn-ghost">Retry</button></div>'; target.removeAttribute('aria-busy'); target.classList.remove('preload-hide'); attachRetry(); structuredLog('list_fetch_error'); announceResultCount(); toggleRefreshBtn(false); });
  }
  function attachRetry(){ var b=document.getElementById('retry-fetch'); if(!b) return; b.addEventListener('click', function(){ fetchList(); }); }
  function listRenderComplete(){ mark('list_ready'); announceResultCount(); if(window.THEME_DIAG_ENABLED){ try { var dur=perfMarks.list_ready - perfMarks.list_render_start; if(navigator.sendBeacon){ navigator.sendBeacon('/themes/metrics/client', new Blob([JSON.stringify({events:[{name:'list_render', duration_ms:Math.round(dur)}]})], {type:'application/json'})); } } catch(_e){} } }
  function injectPrefetchLinks(){
    try {
      var head=document.head; if(!head) return;
      // Remove old dynamic prefetch links
      Array.from(head.querySelectorAll('link[data-dynamic-prefetch]')).forEach(l=>l.remove());
      // Choose top 5 rows (skip currently selected to bias exploration)
      var rows = document.querySelectorAll('#theme-results tr.theme-row[data-theme-id]');
      var current = new URL(window.location.href).searchParams.get('theme');
      var picked=[]; rows.forEach(r=>{ var id=r.getAttribute('data-theme-id'); if(!id) return; if(id===current) return; if(picked.length<5) picked.push(id); });
      picked.forEach(function(id){ var link=document.createElement('link'); link.rel='prefetch'; link.href='/themes/fragment/detail/'+id; link.as='fetch'; link.setAttribute('data-dynamic-prefetch','1'); head.appendChild(link); });
    } catch(e) {}
  }
  function structuredLog(ev){ if(!window.THEME_DIAG_ENABLED) return; try { fetch('/themes/log',{method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({event:ev, ts:Date.now()})}); } catch(_e){} }
  document.addEventListener('htmx:afterOnLoad', function(ev){
    if(ev.target && ev.target.id==='theme-results'){
      var rows = ev.target.querySelectorAll('tr.theme-row[data-theme-id]');
      rows.forEach(function(r){
        var id = r.getAttribute('data-theme-id');
        if(!id) return;
        r.addEventListener('click', function(){
          var url = new URL(window.location.href);
            url.searchParams.set('theme', id);
            var filters = serializeFilters(document.getElementById('theme-picker'));
            if(filters){ url.searchParams.set('filters', filters); }
            history.pushState({ theme:id, filters: filters }, '', url.toString()); window._lastThemeFocusId=id;
        }, { once:false });
        var prefetchTimer;
        r.addEventListener('mouseenter', function(){
          clearTimeout(prefetchTimer);
          prefetchTimer = setTimeout(function(){
            fetch('/themes/fragment/detail/'+id+'?'+(document.getElementById('diag-toggle')?.checked?'diagnostics=1':''), {cache:'force-cache'}).then(function(resp){ structuredLog('prefetch_success'); return resp.text(); }).then(function(_html){ }).catch(function(){ structuredLog('prefetch_error'); });
          }, 180);
        });
        r.addEventListener('mouseleave', function(){ clearTimeout(prefetchTimer); });
      });
      var current = new URL(window.location.href).searchParams.get('theme');
      if(current && !document.getElementById('theme-detail')?.dataset?.loaded){
        htmx.ajax('GET', '/themes/fragment/detail/'+current, '#theme-detail');
      }
      // Restore focus to previously active row if available
      if(window._lastThemeFocusId){
        var targetRow = ev.target.querySelector('tr.theme-row[data-theme-id="'+window._lastThemeFocusId+'"]');
        if(targetRow){ targetRow.focus({preventScroll:false}); }
      }
      buildFilterChips();
      injectPrefetchLinks();
      restoreScroll();
      enableKeyboardNav();
    }
  });
  window.addEventListener('popstate', function(ev){
    var state = ev.state || {};
    if(state.filters){
      var params = new URLSearchParams(state.filters);
      var container = document.getElementById('theme-picker');
      if(container){
        if(params.get('q')) container.querySelector('#theme-search').value = decodeURIComponent(params.get('q'));
        if(params.get('archetype')) container.querySelector('#theme-archetype').value = decodeURIComponent(params.get('archetype'));
        if(params.get('bucket')) container.querySelector('#theme-bucket').value = decodeURIComponent(params.get('bucket'));
        if(params.get('limit')) container.querySelector('#theme-limit').value = decodeURIComponent(params.get('limit'));
        var colorStr = params.get('colors');
        if(colorStr){
          var set = new Set(colorStr.split(','));
          container.querySelectorAll('input[name="colors"]').forEach(function(cb){ cb.checked = set.has(cb.value); });
        }
        if(params.get('diagnostics')==='1'){ var diag=container.querySelector('#diag-toggle'); if(diag){ diag.checked=true; } }
        fetchList();
      }
    }
    if(state.theme){
      htmx.ajax('GET', '/themes/fragment/detail/'+state.theme, '#theme-detail');
    }
  });
  window.addEventListener('load', function(){
    var url = new URL(window.location.href);
    var filters = url.searchParams.get('filters');
    if(filters){
      var params = new URLSearchParams(filters);
      var container = document.getElementById('theme-picker');
      if(container){
        if(params.get('q')) container.querySelector('#theme-search').value = decodeURIComponent(params.get('q'));
        if(params.get('archetype')) container.querySelector('#theme-archetype').value = decodeURIComponent(params.get('archetype'));
        if(params.get('bucket')) container.querySelector('#theme-bucket').value = decodeURIComponent(params.get('bucket'));
        if(params.get('limit')) container.querySelector('#theme-limit').value = decodeURIComponent(params.get('limit'));
        var colorStr = params.get('colors');
        if(colorStr){
          var set = new Set(colorStr.split(','));
          container.querySelectorAll('input[name="colors"]').forEach(function(cb){ cb.checked = set.has(cb.value); });
        }
        if(params.get('diagnostics')==='1'){ var diag=container.querySelector('#diag-toggle'); if(diag){ diag.checked=true; } }
      }
    }
    var theme = url.searchParams.get('theme');
    if(theme){ htmx.ajax('GET','/themes/fragment/detail/'+theme,'#theme-detail'); }
    window.THEME_DIAG_ENABLED = !!document.getElementById('diag-toggle');
  }, { once:true });
  var lastScroll = 0;
  function saveScroll(){ lastScroll = window.scrollY || document.documentElement.scrollTop; }
  function restoreScroll(){ if(typeof lastScroll === 'number'){ window.scrollTo(0, lastScroll); } }
  function buildFilterChips(){
    var host = document.getElementById('filter-chips');
    if(!host) return;
    host.innerHTML='';
    var container = document.getElementById('theme-picker');
    if(!container) return;
    var q = container.querySelector('#theme-search').value.trim();
    var archetype = container.querySelector('#theme-archetype').value;
    var bucket = container.querySelector('#theme-bucket').value;
    var colors = Array.from(container.querySelectorAll('input[name="colors"]:checked')).map(c=>c.value).join(',');
    var diag = container.querySelector('#diag-toggle')?.checked;
    function addChip(label, key){
      var chip = document.createElement('span');
      chip.className='filter-chip';
      chip.innerHTML = '<span>'+label+'</span><button aria-label="Remove '+key+'">×</button>';
      chip.querySelector('button').addEventListener('click', function(){
        if(key==='q'){ container.querySelector('#theme-search').value=''; }
        if(key==='archetype'){ container.querySelector('#theme-archetype').value=''; }
        if(key==='bucket'){ container.querySelector('#theme-bucket').value=''; }
        if(key==='colors'){ container.querySelectorAll('input[name="colors"]').forEach(cb=>cb.checked=false); }
        if(key==='diagnostics'){ var d=container.querySelector('#diag-toggle'); if(d) d.checked=false; }
        fetchList();
      });
      host.appendChild(chip);
    }
    if(q) addChip('Search: '+q, 'q');
    if(archetype) addChip('Archetype: '+archetype, 'archetype');
    if(bucket) addChip('Popularity: '+bucket, 'bucket');
    if(colors) addChip('Colors: '+colors, 'colors');
    if(diag) addChip('Diagnostics', 'diagnostics');
    var syFull = container.querySelector('#synergy-full')?.checked; if(syFull) addChip('Full Synergies','synergy_mode');
  }
  function enableKeyboardNav(){
    var tbody = document.querySelector('#theme-results tbody');
    if(!tbody) return; 
    var rows = Array.from(tbody.querySelectorAll('tr.theme-row'));
    if(!rows.length) return;
    var activeIndex = -1;
    function setActive(i){ rows.forEach(r=>r.classList.remove('is-active')); if(i>=0 && rows[i]){ rows[i].classList.add('is-active'); rows[i].focus({preventScroll:true}); activeIndex=i; } }
    document.addEventListener('keydown', function(e){
      if(['ArrowDown','ArrowUp','Enter','Escape'].indexOf(e.key)===-1) return;
      if(e.key==='ArrowDown'){ e.preventDefault(); setActive(Math.min(activeIndex+1, rows.length-1)); }
      else if(e.key==='ArrowUp'){ e.preventDefault(); setActive(Math.max(activeIndex-1, 0)); }
      else if(e.key==='Enter'){ if(activeIndex>=0){ rows[activeIndex].click(); } }
      else if(e.key==='Escape'){ setActive(-1); var detail=document.getElementById('theme-detail'); if(detail){ detail.innerHTML='Selection cleared.'; detail.setAttribute('aria-live','polite'); } }
    }, { once:false });
    document.addEventListener('keydown', function(e){
      if(e.key==='Enter' && e.shiftKey){ var cb=document.getElementById('synergy-full'); if(cb){ cb.checked=!cb.checked; fetchList(); } }
    });
  }
  var searchInput = document.getElementById('theme-search');
  var searchModeSel = document.getElementById('search-mode');
  var lastExec = 0; var pendingTimer = null; var BASE_DELAY = 250;
  function performSearch(){ fetchList(); }
  function throttledHandler(){ var now=Date.now(); if(now - lastExec > BASE_DELAY){ lastExec = now; performSearch(); } }
  function debouncedHandler(){ clearTimeout(pendingTimer); pendingTimer = setTimeout(performSearch, BASE_DELAY); }
  function attachSearchHandler(){
    if(!searchInput) return;
    searchInput.removeEventListener('keyup', throttledHandler);
    searchInput.removeEventListener('keyup', debouncedHandler);
    if(searchModeSel && searchModeSel.value==='debounce'){
      searchInput.addEventListener('keyup', debouncedHandler);
    } else {
      searchInput.addEventListener('keyup', throttledHandler);
    }
  }
  if(searchModeSel){ searchModeSel.addEventListener('change', attachSearchHandler); }
  attachSearchHandler();
  function toggleRefreshBtn(dis){ var btn=document.getElementById('catalog-refresh-btn'); if(btn){ if(dis){ btn.setAttribute('disabled','disabled'); btn.setAttribute('aria-busy','true'); } else { btn.removeAttribute('disabled'); btn.removeAttribute('aria-busy'); } } }
  function checkStatus(){
    fetch('/themes/status',{cache:'no-store'}).then(r=>r.json()).then(js=>{
      if(js.stale){
        var ind=document.getElementById('theme-stale-indicator'); if(ind){ ind.style.display='inline'; }
        toggleRefreshBtn(true);
        fetch('/themes/refresh',{method:'POST'}).then(()=>{
          var attempts=0; var max=20; var iv=setInterval(()=>{
            fetch('/themes/status',{cache:'no-store'}).then(r=>r.json()).then(s2=>{
              if(!s2.stale){ clearInterval(iv); if(ind) ind.style.display='none'; fetchList(); }
            }).catch(()=>{});
            attempts++; if(attempts>max){ clearInterval(iv); }
          },1500);
        }).finally(()=>{ toggleRefreshBtn(false); });
      }
    }).catch(()=>{});
  }
  function announceResultCount(){ var tbody=document.querySelector('#theme-results tbody'); if(!tbody) return; var count=tbody.querySelectorAll('tr.theme-row').length; var host=document.getElementById('theme-results'); if(host){ host.setAttribute('aria-label', count+' themes'); } }
  window.addEventListener('load', checkStatus, {once:true});
})();
// Preview modal retry/backoff & logging
(function(){
  document.addEventListener('click', function(e){ var btn=e.target.closest('button[data-preview-btn]'); if(!btn) return; var theme=btn.getAttribute('data-theme-id'); if(!theme) return; setTimeout(function(){ attach(theme); }, 40); });
  function attach(theme){
    var modal=document.getElementById('theme-preview-modal'); if(!modal) return;
    var cacheKey='preview:'+theme;
    var tStart = performance.now();
    // Stale-While-Revalidate: show cached HTML immediately if present
    try {
      var cached=sessionStorage.getItem(cacheKey);
      if(cached){ modal.innerHTML=cached; modal.setAttribute('data-swr','stale'); }
    } catch(_e){}
    var attempts=0,max=3,back=350; function run(){ attempts++; fetch('/themes/fragment/preview/'+theme,{cache:'no-store'}).then(function(r){ if(r.status===200) return r.text(); if(r.status===304) return ''; throw new Error('bad'); }).then(function(html){ if(!html) return; modal.innerHTML=html; structuredLog('preview_fetch_success'); try { sessionStorage.setItem(cacheKey, html); } catch(_e){} try { recordPreviewLatency(performance.now()-tStart); } catch(_e){} }).catch(function(){ structuredLog('preview_fetch_error'); try { recordPreviewLatency(performance.now()-tStart, true); } catch(_e){} if(attempts<max){ setTimeout(run, back); back*=2; } else { modal.innerHTML='<div class="preview-modal-content"><div role="alert" style="font-size:13px;">Failed to load preview.<br/><button id="retry-preview" class="btn">Retry</button></div></div>'; var rp=document.getElementById('retry-preview'); if(rp){ rp.addEventListener('click', function(){ attempts=0; back=350; run(); }); } } }); }
    if(/Loading/.test(modal.textContent||'') || modal.getAttribute('data-swr')==='stale') run();
    // Inject export buttons (single insertion guard)
    setTimeout(function(){
      try {
        if(!modal.querySelector('.preview-export-bar') && modal.querySelector('.preview-header')){
          var bar = document.createElement('div');
          bar.className='preview-export-bar';
          bar.style.cssText='margin:.5rem 0 .25rem; display:flex; gap:.5rem; flex-wrap:wrap; align-items:center; font-size:11px;';
          bar.innerHTML = '<button class="btn btn-ghost" style="font-size:11px;padding:2px 8px;" data-exp-json>Export JSON</button>'+
                          '<button class="btn btn-ghost" style="font-size:11px;padding:2px 8px;" data-exp-csv>Export CSV</button>'+
                          '<span style="opacity:.6;">(Respects curated toggle)</span>';
          var header = modal.querySelector('.preview-header');
          header.parentNode.insertBefore(bar, header.nextSibling);
          function curatedOnly(){ try { return localStorage.getItem('mtg:preview.curatedOnly')==='1'; } catch(_){ return false; } }
          bar.querySelector('[data-exp-json]').addEventListener('click', function(){ window.open('/themes/preview/'+encodeURIComponent(theme)+'/export.json?curated_only='+(curatedOnly()?'1':'0'),'_blank'); });
          bar.querySelector('[data-exp-csv]').addEventListener('click', function(){ window.open('/themes/preview/'+encodeURIComponent(theme)+'/export.csv?curated_only='+(curatedOnly()?'1':'0'),'_blank'); });
        }
      } catch(_e){}
    }, 120);
  }
})();
</script>
<style>
  #theme-results.preload-hide { visibility:hidden; }
  #catalog-refresh-btn[disabled]{ opacity:.55; cursor:progress; }
</style>
<script>
// Batch preview latency beacons every 20 events
(function(){
  var latSamples=[]; var errSamples=0; var BATCH=20; window.recordPreviewLatency=function(ms, isErr){ try { latSamples.push(ms); if(isErr) errSamples++; if(latSamples.length>=BATCH && window.THEME_DIAG_ENABLED){ var avg=Math.round(latSamples.reduce((a,b)=>a+b,0)/latSamples.length); var payload={events:[{name:'preview_load_batch', count:latSamples.length, avg_ms:avg, err:errSamples}]}; if(navigator.sendBeacon){ navigator.sendBeacon('/themes/metrics/client', new Blob([JSON.stringify(payload)],{type:'application/json'})); } latSamples=[]; errSamples=0; } } catch(_e){} };
})();
</script>
{% endblock %}