{% extends "base.html" %}
{% block title %}CRR vs Basel 3.1 — RWA Calculator{% endblock %}

{% block content %}
<h1>CRR vs Basel 3.1 impact</h1>
<p class="muted">Runs the portfolio through both frameworks and decomposes the RWA delta into
regulatory drivers. Takes roughly twice a single run.</p>

{% if error %}<div class="callout error">Comparison failed: {{ error }}</div>{% endif %}

<form class="form" method="post" action="/comparison" data-busy-overlay="Running both frameworks…">
  <div class="field">
    <label for="data_path">Data path</label>
    <input id="data_path" name="data_path" value="{{ default_path }}" placeholder="/path/to/data" required>
  </div>
  <div class="field-row">
    <div class="field">
      <label for="permission_mode">Permission mode</label>
      <select id="permission_mode" name="permission_mode">
        <option value="standardised">Standardised (all SA)</option>
        <option value="irb">IRB (model permissions)</option>
      </select>
    </div>
    <div class="field">
      <label for="data_format">Data format</label>
      <select id="data_format" name="data_format">
        <option value="parquet">parquet</option>
        <option value="csv">csv</option>
      </select>
    </div>
    <div class="field">
      <label for="reporting_date">Reporting date</label>
      <input id="reporting_date" name="reporting_date" type="date" value="{{ default_date }}" required>
    </div>
  </div>
  <button class="btn btn-primary" type="submit">Run comparison</button>
</form>

{% if result %}
<h2>Executive summary</h2>
<div class="stat-row">
  <div class="stat"><div class="stat-num">{{ "{:,.0f}".format(result.summary.crr_rwa) }}</div><div class="stat-lbl">CRR total RWA</div></div>
  <div class="stat"><div class="stat-num">{{ "{:,.0f}".format(result.summary.b31_rwa) }}</div><div class="stat-lbl">Basel 3.1 total RWA</div></div>
  <div class="stat"><div class="stat-num">{{ "{:+,.0f}".format(result.summary.delta_rwa) }} ({{ "%+.1f"|format(result.summary.delta_pct) }}%)</div><div class="stat-lbl">Delta RWA</div></div>
  <div class="stat"><div class="stat-num">{{ "%.1f"|format(result.summary.b31_avg_rw * 100) }}%</div><div class="stat-lbl">Basel 3.1 avg RW</div></div>
</div>

<div class="panel">
  <h3>Capital impact waterfall</h3>
  <p class="muted">Each driver is additive; together they sum to the total RWA delta.</p>
  {{ result.chart_waterfall | safe }}
</div>

<div class="panel">
  <h3>RWA by exposure class — CRR vs Basel 3.1</h3>
  {{ result.chart_by_class | safe }}
</div>

<h2>Download comparison</h2>
<p class="muted">Save the comparison — executive summary, by-class and by-approach deltas, the
capital-impact waterfall, and per-exposure deltas. CSV and Parquet download as a zip of one file
per dataset; Excel downloads as a single multi-sheet workbook.</p>
<div class="btn-row">
  <a class="btn btn-ghost" href="{{ result.export_csv_url }}">CSV</a>
  <a class="btn btn-ghost" href="{{ result.export_parquet_url }}">Parquet</a>
  {% if result.xlsx_available %}
  <a class="btn btn-ghost" href="{{ result.export_excel_url }}">Excel</a>
  {% else %}
  <span class="btn btn-ghost is-disabled" title="Install xlsxwriter to enable Excel export">Excel</span>
  {% endif %}
</div>

<h2>By exposure class</h2>
<div class="table-wrap">
  <table class="data">
    <thead><tr>{% for c in result.class_columns %}<th>{{ c }}</th>{% endfor %}</tr></thead>
    <tbody>
      {% for row in result.class_rows %}
      <tr>{% for c in result.class_columns %}
        {% set v = row[c] %}
        <td>{% if v is number %}{{ "{:,.2f}".format(v) }}{% else %}{{ v if v is not none else "" }}{% endif %}</td>
      {% endfor %}</tr>
      {% endfor %}
    </tbody>
  </table>
</div>
{% endif %}
{% endblock %}