{% extends "base.html" %}
{% block title %}Add Batteries — Battery Tracker{% endblock %}

{% block content %}
<h1>Add Batteries</h1>

<div class="card">
  <form method="post" action="{{ url_for('battery_add') }}">

    <div class="form-grid-2col" style="display:grid;grid-template-columns:1fr 1fr;gap:0 1rem;">

      <div class="form-group" style="grid-column:1/-1;">
        <label for="brand-select">Brand <span class="text-danger">*</span></label>
        <select id="brand-select" onchange="metaSelectChanged(this, 'brand')">
          <option value="">— select a brand —</option>
          {% for b in brands|default([]) %}
          <option value="{{ b }}">{{ b }}</option>
          {% endfor %}
          <option value="__new__">➕ New brand…</option>
        </select>
        <input type="text" id="brand" name="brand" value="{{ form_brand|default('') }}"
               placeholder="Type new brand name" required
               style="display:none;margin-top:0.4rem;">
      </div>

      <div class="form-group">
        <label for="count">Quantity</label>
        <input type="number" id="count" name="count" value="{{ form_count|default(1) }}" min="1" max="50">
        <small class="text-muted">Labels are auto-generated (e.g. Eneloop 001, Eneloop 002)</small>
        <div id="label-preview" style="font-size:0.85rem;color:var(--link);margin-top:0.3rem;font-weight:500;min-height:1.2em;"></div>
      </div>

      <div class="form-group">
        <label for="capacity_mah">Capacity (mAh)</label>
        <input type="number" id="capacity_mah" name="capacity_mah" min="0"
               value="" placeholder="e.g. 2000 — optional">
      </div>

      <div class="form-group">
        <label>Size</label>
        <select id="size-select" onchange="metaSelectChanged(this,'size')">
          <option value="">— none —</option>
          {% for opt in ['AA','AAA','C','D','9V','18650','21700','14500','26650','CR2032','CR123A'] %}
          <option value="{{ opt }}">{{ opt }}</option>
          {% endfor %}
          <option value="__new__">Other…</option>
        </select>
        <input type="text" id="size" name="size" value=""
               placeholder="Enter size" style="display:none;margin-top:0.4rem;">
      </div>

      <div class="form-group">
        <label>Chemistry</label>
        <select id="chemistry-select" onchange="metaSelectChanged(this,'chemistry')">
          <option value="">— none —</option>
          {% for opt in ['NiMH','Alkaline','Li-ion','LiFePO4','NiCd','Zinc-Carbon','Li-MnO2'] %}
          <option value="{{ opt }}">{{ opt }}</option>
          {% endfor %}
          <option value="__new__">Other…</option>
        </select>
        <input type="text" id="chemistry" name="chemistry" value=""
               placeholder="Enter chemistry" style="display:none;margin-top:0.4rem;">
      </div>

      <div class="form-group">
        <label for="purchase_date">Purchase Date</label>
        <input type="date" id="purchase_date" name="purchase_date" value="">
      </div>

    </div>

    <div class="form-group">
      <label>Storage Location</label>
      <select id="storage-select" onchange="metaSelectChanged(this,'storage_location')">
        <option value="">— none —</option>
        {% for loc in storage_locations|default([]) %}
        <option value="{{ loc }}">{{ loc }}</option>
        {% endfor %}
        <option value="__new__">➕ New location…</option>
      </select>
      <input type="text" id="storage_location" name="storage_location" value=""
             placeholder="e.g. Drawer 2, Toolbox, Shelf A"
             style="display:none;margin-top:0.4rem;">
    </div>

    <div class="form-group">
      <label for="notes">Notes</label>
      <textarea id="notes" name="notes"
                placeholder="Optional notes applied to all batteries…">{{ form_notes|default('') }}</textarea>
    </div>

    <div class="form-actions">
      <button class="btn btn-primary" type="submit">Add Batteries</button>
      <a class="btn btn-secondary" href="{{ url_for('dashboard') }}">Cancel</a>
    </div>
  </form>
</div>

<script>
var brandCounts = {{ brand_counts|default({})|tojson }};

function metaSelectChanged(sel, inputId) {
  var input = document.getElementById(inputId);
  if (sel.value === '__new__') {
    input.style.display = '';
    input.value = '';
    input.focus();
  } else {
    input.style.display = 'none';
    input.value = sel.value;
  }
  if (inputId === 'brand') updateLabelPreview();
}

function updateLabelPreview() {
  var brand = document.getElementById('brand').value.trim();
  var count = parseInt(document.getElementById('count').value, 10) || 1;
  var preview = document.getElementById('label-preview');
  if (!brand) { preview.textContent = ''; return; }
  var existing = brandCounts[brand] !== undefined ? brandCounts[brand] : 0;
  var first = existing + 1;
  var last  = existing + count;
  var pad = function(n) { return n.toString().padStart(3, '0'); };
  preview.textContent = count === 1
    ? 'Will create: ' + brand + ' ' + pad(first)
    : 'Will create: ' + brand + ' ' + pad(first) + ' \u2192 ' + brand + ' ' + pad(last);
}

document.getElementById('count').addEventListener('input', updateLabelPreview);
document.getElementById('brand').addEventListener('input', updateLabelPreview);

// Restore brand state on error re-render
(function () {
  var input = document.getElementById('brand');
  var sel = document.getElementById('brand-select');
  if (!input.value) return;
  for (var i = 0; i < sel.options.length; i++) {
    if (sel.options[i].value === input.value) {
      sel.value = input.value;
      input.style.display = 'none';
      return;
    }
  }
  sel.value = '__new__';
  input.style.display = '';
}());
</script>
{% endblock %}