{% extends "base.html" %}
{% block title %}{{ title }} — ERP WaterSurf{% endblock %}
{% block content %}
<div class="ws-card">
  <h2 class="ws-page-title">{% if object %}Редактировать{% else %}Создать{% endif %} {{ title }}</h2>
  <form method="post" class="ws-form-card">
    {% csrf_token %}
    {% for field in form %}
    <div class="ws-form-group">
      <label for="{{ field.id_for_label }}">{{ field.label }}</label>
      {{ field }}
      {% if field.errors %}<small class="ws-text-danger">{{ field.errors.0 }}</small>{% endif %}
    </div>
    {% endfor %}
    <div class="ws-form-section">
      <h3 class="ws-form-section-title">Товары</h3>
      {{ formset.management_form }}
      <div class="ws-table-wrap">
        <table class="ws-table" id="order-items">
          <thead>
            <tr>
              <th>Товар</th>
              <th>Цена</th>
              <th>Валюта</th>
              <th>Количество</th>
              <th class="ws-num">Стоимость</th>
              <th>Удалить</th>
            </tr>
          </thead>
          <tbody id="order-items-body">
            {% for f in formset %}
            <tr class="item-row">
              <td>{{ f.id }}{{ f.product }}</td>
              <td>{{ f.price }}</td>
              <td>{{ f.currency }}</td>
              <td>{{ f.quantity }}</td>
              <td class="row-amount ws-num">—</td>
              <td>{% if f.DELETE %}{{ f.DELETE }}{% endif %}</td>
            </tr>
            {% endfor %}
          </tbody>
        </table>
      </div>
      <div class="ws-btn-group" style="margin-top: 0.75rem;">
        <button type="button" class="btn btn-ws-secondary" id="add-order-row">+ Добавить строку</button>
      </div>
    </div>
    <div class="ws-btn-group" style="margin-top: 1.25rem;">
      <button type="submit" class="btn btn-ws-primary">Сохранить</button>
      <a href="{% url 'documents:customer_order_list' %}" class="btn btn-ws-secondary">Отмена</a>
    </div>
  </form>
</div>
{% block extra_js %}
<script>
(function() {
  var form = document.querySelector('.ws-form-card');
  var tbody = document.getElementById('order-items-body');
  var totalInput = form.querySelector('input[name$="-TOTAL_FORMS"]');
  if (!totalInput || !tbody) return;

  function getPrefix() {
    var name = totalInput.getAttribute('name');
    return name.replace(/-TOTAL_FORMS$/, '');
  }

  function updateRowAmounts() {
    document.querySelectorAll('#order-items .item-row').forEach(function(row) {
      var price = parseFloat(row.querySelector('input[name$="-price"]')?.value) || 0;
      var qty = parseFloat(row.querySelector('input[name$="-quantity"]')?.value) || 0;
      var el = row.querySelector('.row-amount');
      if (el) el.textContent = (price * qty).toFixed(2);
    });
  }

  form.addEventListener('input', updateRowAmounts);

  document.getElementById('add-order-row').addEventListener('click', function() {
    var rows = tbody.querySelectorAll('.item-row');
    var lastRow = rows[rows.length - 1];
    if (!lastRow) return;
    var prefix = getPrefix();
    var nextIndex = parseInt(totalInput.value, 10);
    var clone = lastRow.cloneNode(true);
    clone.querySelectorAll('input, select').forEach(function(el) {
      var name = el.getAttribute('name');
      if (name && name.indexOf(prefix) === 0) {
        el.setAttribute('name', name.replace(new RegExp('^' + prefix + '\\d+-'), prefix + nextIndex + '-'));
        el.setAttribute('id', (el.getAttribute('id') || '').replace(new RegExp(prefix + '\\d+-'), prefix + nextIndex + '-'));
      }
      if (el.name && el.name.indexOf('-DELETE') !== -1) {
        el.checked = false;
      } else if (el.name && el.name.indexOf('-id') !== -1) {
        el.value = '';
      } else if (el.type !== 'hidden') {
        el.value = '';
      }
    });
    var amountCell = clone.querySelector('.row-amount');
    if (amountCell) amountCell.textContent = '—';
    tbody.appendChild(clone);
    totalInput.value = nextIndex + 1;
  });
})();
</script>
{% endblock %}
{% endblock %}