{% extends 'ops/base_ops.html' %}
{% block title %}Intake lineage - {{ batch.batch_reference }} - IXG Operations{% endblock %}
{% block content %}

{% if messages %}
  {% for m in messages %}<div class="alert alert-{{ m.tags }} py-2">{{ m }}</div>{% endfor %}
{% endif %}

<div class="page-header d-flex justify-content-between align-items-center">
  <h2>Intake lineage: {{ batch.batch_reference }}</h2>
  <a href="{% url 'ops:batch_detail' batch.pk %}" class="btn btn-sm btn-outline-secondary"><i class="bi bi-arrow-left"></i> Back to the batch</a>
</div>

<div class="row g-3">
  <div class="col-md-8">
    <div class="stat-card">
      <form method="post" novalidate>
        {% csrf_token %}
        {{ formset.management_form }}

        {% if formset.non_form_errors %}
          {% for e in formset.non_form_errors %}<div class="alert alert-danger py-2">{{ e }}</div>{% endfor %}
        {% endif %}

        <!-- table-layout: fixed, or the intake dropdown's intrinsic width (a native
             select sizes to its longest option) pushes the weight field and the
             Remove box off the card. -->
        <table class="table table-sm align-middle mb-3" style="table-layout: fixed;">
          <thead>
            <tr>
              <th>Harvest intake</th>
              <th style="width: 10rem;">Allocated (kg)</th>
              <th style="width: 6rem;">Remove</th>
            </tr>
          </thead>
          <tbody>
            {% for f in formset.forms %}
            <tr>
              {% for hidden in f.hidden_fields %}{{ hidden }}{% endfor %}
              <td>
                {{ f.harvest_intake }}
                {% for e in f.harvest_intake.errors %}<div class="text-danger small">{{ e }}</div>{% endfor %}
              </td>
              <td>
                {{ f.weight_allocated_kg }}
                {% for e in f.weight_allocated_kg.errors %}<div class="text-danger small">{{ e }}</div>{% endfor %}
              </td>
              <td>
                {% if f.instance.pk %}{{ f.DELETE }}{% endif %}
              </td>
            </tr>
            {% endfor %}
          </tbody>
        </table>

        <button type="submit" class="btn btn-primary">Save lineage</button>
        <a href="{% url 'ops:batch_detail' batch.pk %}" class="btn btn-outline-secondary">Cancel</a>
      </form>
    </div>
  </div>

  <div class="col-md-4">
    <div class="stat-card mb-3">
      <h6 class="mb-3"><i class="bi bi-calculator"></i> Weights</h6>
      <table class="table table-sm mb-0">
        <tr><td class="text-secondary">Allocated to this batch</td><td>{{ total_allocated }} kg</td></tr>
        <tr><td class="text-secondary">Batch weight</td><td>{{ batch.weight_kg|default:'-' }} kg</td></tr>
        {% if difference is not None %}
        <tr>
          <td class="text-secondary">Difference</td>
          <td>{{ difference }} kg</td>
        </tr>
        {% endif %}
      </table>
      <p class="small text-secondary mt-2 mb-0">
        The platform shows these two figures side by side; it does not reconcile
        them. A difference where the batch is heavier means part of the batch is
        not traced to an intake; allocations above the batch weight are the usual
        processing loss.
      </p>
    </div>

    <div class="stat-card mb-3">
      <h6 class="mb-3"><i class="bi bi-shield-check"></i> What this feeds</h6>
      <ul class="small mb-2 ps-3">
        <li><strong>Lineage</strong> &mdash; the batch needs at least one intake</li>
        <li><strong>Geolocation</strong> &mdash; every linked intake must point at a
          <em>verified</em> origin zone</li>
        <li><strong>Intake data</strong> &mdash; every linked intake needs a date and
          a weight</li>
      </ul>
      <p class="small mb-0">
        This table is what the due-diligence case for {{ batch.batch_reference }}
        reads, and what a buyer or an auditor traces the batch back through.
      </p>
    </div>

    <div class="stat-card">
      <h6 class="mb-3"><i class="bi bi-exclamation-triangle"></i> One intake, limited weight</h6>
      <p class="small mb-2">
        An intake received a finite weight of shea, and what is allocated out of it
        is counted across <strong>every</strong> batch. An allocation that would
        take more than the intake received is refused, whether the excess is over
        the intake's own weight or over what other batches have already taken.
      </p>
      <p class="small mb-0">
        Removing a row here deletes the link only &mdash; the intake record itself
        is untouched.
      </p>
    </div>
  </div>
</div>

{% endblock %}