<?= $this->extend('layout/management_layout') ?>
<?= $this->section('content') ?>

<div class="container-fluid px-0 mt-3">
  <div class="d-flex justify-content-between align-items-center mb-3 px-3">
    <h3 class="mb-0">Books</h3>
    <div class="btn-group">
      <a class="btn btn-primary" href="<?= site_url('inventory/create/book') ?>">Add Book</a>
      <button class="btn btn-outline-secondary" data-bs-toggle="modal" data-bs-target="#addCategoryModal">Add Category</button>
    </div>
  </div>

  <?= view('partials/flash_messages') ?>
  <div class="px-3 mb-2"><?= $this->include('partials/academic_filter') ?></div>

  <?php
  // Helper to render a compact grade label from a category row
  $gradeLabel = function (?array $cat): string {
      if (!$cat) return '—';
      $gmin = $cat['grade_min'] ?? null;
      $gmax = $cat['grade_max'] ?? null;
      if ($gmin === null && $gmax === null) return '—';
      if ($gmin !== null && $gmax !== null) return 'G' . (int)$gmin . '–G' . (int)$gmax;
      if ($gmin !== null) return 'G' . (int)$gmin . '+';
      return '≤G' . (int)$gmax;
  };
  ?>

  <div class="card mb-4">
    <div class="card-header d-flex justify-content-between align-items-center">
      <span>Books</span>
      <select class="form-select form-select-sm" id="categoryFilter" style="min-width:260px">
        <option value="">All Categories</option>
        <?php foreach ($categories as $c): ?>
          <?php
            $label = $c['name'] ?? '';
            $gl    = $gradeLabel($c);
            if ($gl !== '—') $label .= ' (' . $gl . ')';
          ?>
          <option value="<?= esc($c['id']) ?>"><?= esc($label) ?></option>
        <?php endforeach; ?>
      </select>
    </div>
    <div class="card-body table-responsive">
      <table class="table table-striped align-middle" id="inventoryTable" data-no-mgmt-sticky="1">
        <thead>
          <tr>
            <th>Name</th><th>ISBN</th><th>Edition</th>
            <th>Category</th>
            <th>Grade Range</th> <!-- NEW -->
            <th>Qty</th><th>Unit</th>
            <th>Updated By</th><th>Updated Date</th>
            <th>SKU</th><th style="width:110px">Actions</th>
          </tr>
        </thead>
        <tbody>
        <?php foreach ($items as $i): ?>
          <?php
            $cat = array_values(array_filter($categories, fn($c)=>($c['id']??null)==($i['category_id']??null)))[0] ?? null;
            $catName   = $cat['name'] ?? '—';
            $catGrades = $gradeLabel($cat);
          ?>
          <tr data-category="<?= esc($i['category_id'] ?? '') ?>">
            <td><?= esc($i['name']) ?></td>
            <td><?= esc($i['isbn']) ?></td>
            <td><?= esc($i['edition']) ?></td>
            <td><?= esc($catName) ?></td>
            <td><?= esc($catGrades) ?></td> <!-- NEW -->
            <td><?= esc($i['quantity']) ?></td>
            <td><?= esc($i['unit']) ?></td>
            <td><?= esc($userNames[(int)($i['updated_by'] ?? 0)] ?? '—') ?></td>
            <td><?= esc($i['updated_at'] ? local_datetime($i['updated_at'], 'm-d-Y H:i') : '—') ?></td>
            <td><?= esc($i['sku']) ?></td>
            <td>
              <a class="btn btn-sm btn-outline-primary" href="<?= site_url('inventory/edit/'.$i['id']) ?>">Edit</a>
              <form action="<?= site_url('inventory/delete/'.$i['id']) ?>" method="post" class="d-inline">
                <?= csrf_field() ?>
                <button class="btn btn-sm btn-outline-danger" onclick="return confirm('Delete this item?')">Del</button>
              </form>
            </td>
          </tr>
        <?php endforeach; ?>
        </tbody>
      </table>
    </div>
  </div>
</div>

<!-- Add Category Modal -->
<div class="modal fade" id="addCategoryModal" tabindex="-1" aria-hidden="true">
  <div class="modal-dialog">
    <form class="modal-content" method="post" action="<?= site_url('inventory/category/save') ?>">
      <?= csrf_field() ?>
      <input type="hidden" name="type" value="book">
      <div class="modal-header">
        <h5 class="modal-title">Add Category (Books)</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
      </div>
      <div class="modal-body">
        <div class="mb-3">
          <label class="form-label">Name</label>
          <input type="text" name="name" class="form-control" required>
        </div>

        <!-- NEW: Grade range -->
        <div class="row g-2 mb-3">
          <div class="col-6">
            <label class="form-label">Grade Min</label>
            <input type="number" name="grade_min" class="form-control" min="0" max="13" placeholder="e.g., 1">
          </div>
          <div class="col-6">
            <label class="form-label">Grade Max</label>
            <input type="number" name="grade_max" class="form-control" min="0" max="13" placeholder="e.g., 3">
          </div>
          <div class="col-12">
            <small class="text-muted">Optional. Only used for Book categories.</small>
          </div>
        </div>

        <div class="mb-0">
          <label class="form-label">Description (optional)</label>
          <textarea name="description" class="form-control" rows="2"></textarea>
        </div>
      </div>
      <div class="modal-footer"><button class="btn btn-primary">Save Category</button></div>
    </form>
  </div>
</div>

<script>
document.getElementById('categoryFilter')?.addEventListener('change', function() {
  const val = this.value;
  document.querySelectorAll('#inventoryTable tbody tr').forEach(tr => {
    tr.style.display = (!val || tr.getAttribute('data-category') === val) ? '' : 'none';
  });
});
</script>

<?= $this->endSection() ?>
