{% assign invalid_analytics_dates = false %}{% for row in site.data.dashboards.analytics %}{% assign calendar_date = row.date | date: '%Y-%m-%d' %}{% assign calendar_epoch = row.date | date: '%s' %}{% if calendar_date != row.date or calendar_epoch == row.date %}{% assign invalid_analytics_dates = true %}{% endif %}{% endfor %}
{% if site.data.dashboards.analytics == empty %}
<p role="status" data-analytics-empty>No analytics data is available in this snapshot.</p>
{% elsif invalid_analytics_dates %}
<p role="status" data-analytics-calendar-error>Analytics data unavailable: observation dates must be valid calendar dates.</p>
{% else %}
{% assign initial = site.data.dashboards.analytics | where_exp: 'item', 'item.date >= "2026-10-22" and item.date <= "2026-10-28"' %}
{% assign categories = site.data.dashboards.categories | uniq %}
{% assign expected_dates = '2026-10-22,2026-10-23,2026-10-24,2026-10-25,2026-10-26,2026-10-27,2026-10-28' | split: ',' %}
{% assign missing_initial = 0 %}
{% for date in expected_dates %}{% assign daily_observations = initial | where: 'date', date %}{% for category in categories %}{% assign matching_observations = daily_observations | where: 'category', category %}{% if matching_observations == empty %}{% assign missing_initial = missing_initial | plus: 1 %}{% endif %}{% endfor %}{% endfor %}
{% assign previous = site.data.dashboards.analytics | where_exp: 'item', 'item.date >= "2026-10-15" and item.date <= "2026-10-21"' %}
{% assign previous_dates = '2026-10-15,2026-10-16,2026-10-17,2026-10-18,2026-10-19,2026-10-20,2026-10-21' | split: ',' %}
{% assign missing_previous = 0 %}
{% for date in previous_dates %}{% assign daily_previous = previous | where: 'date', date %}{% for category in categories %}{% assign matching_previous = daily_previous | where: 'category', category %}{% if matching_previous == empty %}{% assign missing_previous = missing_previous | plus: 1 %}{% endif %}{% endfor %}{% endfor %}
{% assign numeric_fields = 'sessions,downloads,completions,duration_seconds' | split: ',' %}
{% assign precision_error = false %}{% assign invalid_numeric = false %}{% assign precision_limit = 9007199254740991 %}
{% for field in numeric_fields %}
  {% assign field_total = 0 %}
  {% for row in initial %}{% assign value = row[field] %}{% assign whole = value | floor %}{% if value == nil or value < 0 or value != whole %}{% assign invalid_numeric = true %}{% elsif value > precision_limit %}{% assign precision_error = true %}{% else %}{% assign field_total = field_total | plus: value %}{% if field_total > precision_limit %}{% assign precision_error = true %}{% endif %}{% endif %}{% endfor %}
  {% if missing_initial == 0 and missing_previous == 0 %}
    {% assign field_total = 0 %}
    {% for row in previous %}{% assign value = row[field] %}{% assign whole = value | floor %}{% if value == nil or value < 0 or value != whole %}{% assign invalid_numeric = true %}{% elsif value > precision_limit %}{% assign precision_error = true %}{% else %}{% assign field_total = field_total | plus: value %}{% if field_total > precision_limit %}{% assign precision_error = true %}{% endif %}{% endif %}{% endfor %}
  {% endif %}
{% endfor %}
{% assign data_error_message = '' %}
{% assign metrics_unavailable = false %}{% if invalid_numeric or precision_error %}{% assign metrics_unavailable = true %}{% endif %}
{% if invalid_numeric %}{% assign data_error_message = 'Analytics observations must be nonnegative whole numbers.' %}{% elsif precision_error %}{% assign data_error_message = 'Analytics totals exceed supported safe integer precision.' %}{% endif %}
<form class="example-form dash-toolbar" id="analytics-filters" novalidate>
  <fieldset disabled data-dashboard-controls><legend>Analytics filters</legend><div class="dash-controls">
    <div><label for="analytics-range">Date range</label><select id="analytics-range" name="range"><option value="7">Last 7 days</option><option value="14">Last 14 days</option><option value="28">Last 28 days</option><option value="custom">Custom range</option></select></div>
    <div><label for="analytics-start">Start date</label><input id="analytics-start" name="start" type="date" min="2026-09-03" max="2026-10-28" value="2026-10-22" required></div>
    <div><label for="analytics-end">End date</label><input id="analytics-end" name="end" type="date" min="2026-09-03" max="2026-10-28" value="2026-10-28" required></div>
    <div><label for="analytics-category">Category</label><select id="analytics-category" name="category"><option value="">All categories</option>{% for category in categories %}<option value="{{ category | escape }}">{{ category | escape }}</option>{% endfor %}</select></div>
  </div><button class="{% include examples/button-classes.html %}" type="submit">Apply filters</button><button class="{% include examples/button-classes.html secondary=true %}" type="button" data-export-analytics>Download filtered CSV</button></fieldset>
  <p id="analytics-error" class="dash-error" role="alert" hidden></p>
</form>
<p data-dashboard-fallback>Interactive dashboard controls are unavailable. Reload to try again.</p>
<p class="dash-status" role="status" data-dashboard-status{% if data_error_message != empty %} data-analytics-data-error{% endif %}>{% if data_error_message != empty %}{{ data_error_message }}{% elsif initial == empty %}No observations are available for the selected range and category.{% elsif missing_initial > 0 %}Partial data: {{ missing_initial }} expected observation{% if missing_initial == 1 %} is{% else %}s are{% endif %} missing. Totals use available observations.{% else %}Published source data is shown below.{% endif %}</p>
<dl class="dash-metrics" aria-label="Analytics summary">
  {% include examples/metric.html id='sessions' label='Sessions' unavailable=metrics_unavailable %}
  {% include examples/metric.html id='downloads' label='Downloads' unavailable=metrics_unavailable %}
  {% include examples/metric.html id='conversion' label='Completion rate' unavailable=metrics_unavailable %}
  {% include examples/metric.html id='mean_duration' label='Mean session duration' unavailable=metrics_unavailable %}
</dl>
<div class="dash-grid">
  {% include examples/chart.html id='sessions' title='Session trend' description='Daily sessions across the selected categories.' %}
  {% include examples/chart.html id='downloads' title='Download trend' description='Daily downloads in the selected period.' %}
  {% include examples/chart.html id='categories' title='Category comparison' description='Current sessions versus the preceding period of equal length, when available.' %}
</div>
<section class="dash-panel" aria-labelledby="analytics-source-title"><h2 id="analytics-source-title">Analytics source records</h2><p>Counts are synthetic. Completion rate = completed tasks ÷ sessions; mean duration is weighted by session count.</p>
<div class="example-table-scroll" role="region" aria-label="Analytics source records" tabindex="0"><table id="analytics-source"><caption>Selected source records — dates and categories</caption><thead><tr><th scope="col">Date</th><th scope="col">Category</th><th scope="col">Sessions</th><th scope="col">Downloads</th><th scope="col">Completed tasks</th></tr></thead><tbody>{% assign dates = initial | map: 'date' | uniq | sort %}{% for date in dates %}{% assign daily = initial | where: 'date', date %}{% for category in categories %}{% assign category_rows = daily | where: 'category', category %}{% for row in category_rows %}<tr><th scope="row">{{ row.date | escape }}</th><td>{{ row.category | escape }}</td><td>{{ row.sessions }}</td><td>{{ row.downloads }}</td><td>{{ row.completions }}</td></tr>{% endfor %}{% endfor %}{% for row in daily %}{% unless categories contains row.category %}<tr><th scope="row">{{ row.date | escape }}</th><td>{{ row.category | escape }}</td><td>{{ row.sessions }}</td><td>{{ row.downloads }}</td><td>{{ row.completions }}</td></tr>{% endunless %}{% endfor %}{% endfor %}</tbody></table></div></section>

<noscript><p class="example-notice">{% if data_error_message != empty %}JavaScript is required to choose a different range.{% else %}Interactive filtering and charts require JavaScript. The published data table remains available; controls are disabled.{% endif %}</p></noscript>
{% endif %}