<?php
ob_start();
$pageTitle   = 'Import / Export Inventory';
$currentPage = 'import-export';
require_once __DIR__ . '/includes/header.php';

/* ────────────────────────────────────────────────────
   EXPORT
──────────────────────────────────────────────────── */
if (isset($_GET['export'])) {
    $products = db()->fetchAll(
        "SELECT p.*, c.name as category_name FROM products p
         LEFT JOIN categories c ON p.category = c.slug
         ORDER BY p.name ASC"
    );

    $cols = ['product_id','name','description','price','sale_price','cost_price',
             'sku','barcode','category','tags','stock','low_stock_threshold',
             'weight','is_active','is_featured','images'];

    ob_end_clean();
    header('Content-Type: text/csv; charset=UTF-8');
    header('Content-Disposition: attachment; filename="inventory_' . date('Y-m-d') . '.csv"');
    header('Cache-Control: no-cache');
    echo "\xEF\xBB\xBF"; // UTF-8 BOM — makes Excel open correctly
    $out = fopen('php://output', 'w');
    fputcsv($out, $cols);
    foreach ($products as $p) {
        fputcsv($out, array_map(fn($c) => $p[$c] ?? '', $cols));
    }
    fclose($out);
    exit;
}

/* ────────────────────────────────────────────────────
   INLINE FIELD EDIT (AJAX)
──────────────────────────────────────────────────── */
if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'inline_edit') {
    ob_end_clean();
    header('Content-Type: application/json');
    $pid   = $_POST['product_id'] ?? '';
    $field = $_POST['field']      ?? '';
    $val   = $_POST['value']      ?? '';

    $allowed = ['stock','price','sale_price','cost_price','sku','is_active'];
    if (!$pid || !in_array($field, $allowed)) {
        echo json_encode(['error' => 'Invalid']); exit;
    }
    if ($field === 'sale_price' && trim($val) === '') $val = null;

    db()->update('products', [$field => $val === '' ? null : $val],
                 'product_id = :id', ['id' => $pid]);
    echo json_encode(['ok' => true, 'val' => $val]);
    exit;
}

/* ────────────────────────────────────────────────────
   IMPORT  (POST with file)
──────────────────────────────────────────────────── */
if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'import') {
    $mode = $_POST['mode'] ?? 'smart'; // smart | replace

    if (empty($_FILES['csv_file']['tmp_name'])) {
        setFlash('error', 'No file uploaded'); header('Location: /admin/import-export.php'); exit;
    }

    $fh = fopen($_FILES['csv_file']['tmp_name'], 'r');
    // Strip UTF-8 BOM if present
    $bom = fread($fh, 3);
    if ($bom !== "\xEF\xBB\xBF") rewind($fh);

    $headers = fgetcsv($fh);
    if (!$headers) {
        setFlash('error', 'Could not read CSV headers'); header('Location: /admin/import-export.php'); exit;
    }
    $headers = array_map('trim', $headers);

    // Required: name + price
    if (!in_array('name', $headers) || !in_array('price', $headers)) {
        setFlash('error', 'CSV must have at least "name" and "price" columns');
        header('Location: /admin/import-export.php'); exit;
    }

    $rows = [];
    while (($row = fgetcsv($fh)) !== false) {
        if (count($row) < 2) continue;
        $rows[] = array_combine($headers, array_pad($row, count($headers), ''));
    }
    fclose($fh);

    if (empty($rows)) {
        setFlash('error', 'No data rows found in CSV');
        header('Location: /admin/import-export.php'); exit;
    }

    $inserted = $updated = $deleted = 0;

    try {
        // Get current product IDs
        $existing = array_column(db()->fetchAll("SELECT product_id FROM products"), 'product_id');
        $importedIds = array_filter(array_column($rows, 'product_id'));

        if ($mode === 'replace') {
            // Wipe and reimport — warn user before this in the UI
            db()->query("DELETE FROM products WHERE product_id IS NOT NULL", []);
            foreach ($rows as $r) {
                $pid = (!empty($r['product_id'])) ? $r['product_id'] : generateId('prod_');
                db()->insert('products', [
                    'product_id'         => $pid,
                    'name'               => $r['name'],
                    'description'        => $r['description'] ?? null,
                    'price'              => floatval($r['price'] ?? 0),
                    'sale_price'         => ($r['sale_price'] ?? '') !== '' ? floatval($r['sale_price']) : null,
                    'cost_price'         => ($r['cost_price'] ?? '') !== '' ? floatval($r['cost_price']) : null,
                    'sku'                => $r['sku']      ?? null,
                    'barcode'            => $r['barcode']   ?? null,
                    'category'           => $r['category']  ?? null,
                    'tags'               => $r['tags']      ?? null,
                    'stock'              => intval($r['stock'] ?? 0),
                    'low_stock_threshold'=> intval($r['low_stock_threshold'] ?? 10),
                    'weight'             => ($r['weight'] ?? '') !== '' ? floatval($r['weight']) : null,
                    'is_active'          => intval($r['is_active'] ?? 1),
                    'is_featured'        => intval($r['is_featured'] ?? 0),
                    'images'             => $r['images'] ?? null,
                ]);
                $inserted++;
            }
        } else {
            // Smart mode: update existing, insert new, delete removed
            foreach ($rows as $r) {
                $pid  = $r['product_id'] ?? '';
                $data = [
                    'name'               => $r['name'],
                    'description'        => $r['description'] ?? null,
                    'price'              => floatval($r['price'] ?? 0),
                    'sale_price'         => ($r['sale_price'] ?? '') !== '' ? floatval($r['sale_price']) : null,
                    'cost_price'         => ($r['cost_price'] ?? '') !== '' ? floatval($r['cost_price']) : null,
                    'sku'                => $r['sku']      ?? null,
                    'barcode'            => $r['barcode']   ?? null,
                    'category'           => $r['category']  ?? null,
                    'tags'               => $r['tags']      ?? null,
                    'stock'              => intval($r['stock'] ?? 0),
                    'low_stock_threshold'=> intval($r['low_stock_threshold'] ?? 10),
                    'weight'             => ($r['weight'] ?? '') !== '' ? floatval($r['weight']) : null,
                    'is_active'          => intval($r['is_active'] ?? 1),
                    'is_featured'        => intval($r['is_featured'] ?? 0),
                    'images'             => $r['images'] ?? null,
                ];

                if ($pid && in_array($pid, $existing)) {
                    db()->update('products', $data, 'product_id = :id', ['id' => $pid]);
                    $updated++;
                } else {
                    $data['product_id'] = $pid ?: generateId('prod_');
                    db()->insert('products', $data);
                    $inserted++;
                }
            }
            // Delete products not in import
            $toDelete = array_diff($existing, $importedIds);
            foreach ($toDelete as $pid) {
                db()->delete('products', 'product_id = :id', ['id' => $pid]);
                $deleted++;
            }
        }

        $msg = "Import complete — {$inserted} added, {$updated} updated";
        if ($deleted) $msg .= ", {$deleted} removed";
        setFlash('success', $msg);

    } catch (Exception $e) {
        setFlash('error', 'Import failed: ' . $e->getMessage());
    }

    header('Location: /admin/import-export.php'); exit;
}

/* ────────────────────────────────────────────────────
   DELETE single product
──────────────────────────────────────────────────── */
if ($_SERVER['REQUEST_METHOD'] === 'POST' && ($_POST['action'] ?? '') === 'delete') {
    db()->delete('products', 'product_id = :id', ['id' => $_POST['product_id'] ?? '']);
    setFlash('success', 'Product deleted');
    header('Location: /admin/import-export.php'); exit;
}

/* ────────────────────────────────────────────────────
   LIST
──────────────────────────────────────────────────── */
$search = trim($_GET['search'] ?? '');
$catFilter = $_GET['category'] ?? '';

$where  = ['1=1'];
$params = [];
if ($search) {
    $where[]           = '(p.name LIKE :q OR p.sku LIKE :q2 OR p.category LIKE :q3)';
    $params['q']  = $params['q2'] = $params['q3'] = "%$search%";
}
if ($catFilter) {
    $where[]               = 'p.category = :cat';
    $params['cat']         = $catFilter;
}
$whereSQL = implode(' AND ', $where);

$products = db()->fetchAll(
    "SELECT p.* FROM products p WHERE $whereSQL ORDER BY p.name ASC",
    $params
);
$categories = db()->fetchAll("SELECT name, slug FROM categories WHERE is_active=1 ORDER BY name");
$totalProducts = db()->count('products');
$totalStock    = db()->fetch("SELECT SUM(stock) as s FROM products")['s'] ?? 0;
$lowStock      = db()->count('products', 'stock <= low_stock_threshold AND is_active = 1');
?>

<div class="page-header" style="flex-wrap:wrap;gap:.75rem">
    <h1 class="page-title">Import / Export Inventory</h1>
    <div style="display:flex;gap:.75rem;flex-wrap:wrap">
        <a href="/admin/import-export.php?export=1" class="btn btn-success">
            <i class="fas fa-file-download"></i> Export CSV
        </a>
        <button class="btn btn-primary" onclick="document.getElementById('importPanel').classList.toggle('hidden')">
            <i class="fas fa-file-upload"></i> Import CSV
        </button>
        <a href="/admin/product-edit.php" class="btn btn-secondary">
            <i class="fas fa-plus"></i> Add Product
        </a>
    </div>
</div>

<?php if (hasFlash('success')): ?>
    <div class="alert alert-success"><i class="fas fa-check-circle"></i> <?= getFlash('success') ?></div>
<?php endif; ?>
<?php if (hasFlash('error')): ?>
    <div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> <?= getFlash('error') ?></div>
<?php endif; ?>

<!-- Stats -->
<div class="stats-grid" style="margin-bottom:1.5rem">
    <div class="stat-card">
        <div class="stat-card-icon primary"><i class="fas fa-box"></i></div>
        <div><div class="stat-card-value"><?= $totalProducts ?></div><div class="stat-card-label">Total Products</div></div>
    </div>
    <div class="stat-card">
        <div class="stat-card-icon success"><i class="fas fa-cubes"></i></div>
        <div><div class="stat-card-value"><?= number_format($totalStock) ?></div><div class="stat-card-label">Total Units in Stock</div></div>
    </div>
    <div class="stat-card">
        <div class="stat-card-icon <?= $lowStock > 0 ? 'warning' : 'success' ?>"><i class="fas fa-exclamation-triangle"></i></div>
        <div><div class="stat-card-value"><?= $lowStock ?></div><div class="stat-card-label">Low Stock Alerts</div></div>
    </div>
</div>

<!-- Import Panel (hidden by default) -->
<div id="importPanel" class="hidden admin-card" style="margin-bottom:1.5rem;border:2px solid var(--admin-primary)">
    <div class="admin-card-header" style="background:rgba(255,94,26,.06)">
        <h3><i class="fas fa-file-upload"></i> Import Inventory from CSV</h3>
    </div>
    <div class="admin-card-body">
        <div style="display:grid;grid-template-columns:1fr 1fr;gap:2rem">

            <!-- Mode selector -->
            <div>
                <h4 style="margin:0 0 .75rem">Import Mode</h4>
                <label id="modeSmart" style="display:flex;align-items:flex-start;gap:.75rem;padding:1rem;border:2px solid var(--admin-primary);border-radius:var(--radius-md);cursor:pointer;margin-bottom:.75rem;background:rgba(255,94,26,.04)">
                    <input type="radio" name="importMode" value="smart" checked onchange="setMode(this)" style="margin-top:.15rem;flex-shrink:0">
                    <div>
                        <strong>Smart Update</strong> <span class="badge badge-success" style="margin-left:.25rem">Recommended</span><br>
                        <span class="text-muted" style="font-size:.85rem">Updates existing products, adds new ones, removes products not in the file. <strong>Preserves order history.</strong></span>
                    </div>
                </label>
                <label id="modeReplace" style="display:flex;align-items:flex-start;gap:.75rem;padding:1rem;border:2px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer">
                    <input type="radio" name="importMode" value="replace" onchange="setMode(this)" style="margin-top:.15rem;flex-shrink:0">
                    <div>
                        <strong style="color:var(--color-error)"><i class="fas fa-exclamation-triangle"></i> Full Replace</strong><br>
                        <span class="text-muted" style="font-size:.85rem">Deletes ALL existing products first, then imports. Use only if you want a clean slate.</span>
                    </div>
                </label>
            </div>

            <!-- Upload form -->
            <div>
                <h4 style="margin:0 0 .75rem">Upload File</h4>
                <form method="POST" enctype="multipart/form-data" id="importForm" onsubmit="return confirmImport()">
                    <input type="hidden" name="action" value="import">
                    <input type="hidden" name="mode" id="importModeField" value="smart">

                    <div id="csvDrop" style="border:2px dashed var(--color-border);border-radius:var(--radius-md);padding:2rem;text-align:center;cursor:pointer;transition:all .2s;position:relative;margin-bottom:1rem">
                        <i class="fas fa-file-csv" style="font-size:2.5rem;color:var(--admin-text-muted);display:block;margin-bottom:.5rem"></i>
                        <div style="font-size:.9rem;color:var(--admin-text-muted)">Drop CSV here or <span style="color:var(--admin-primary);font-weight:600">browse</span></div>
                        <div id="csvFileName" style="margin-top:.5rem;font-weight:600;color:var(--admin-primary)"></div>
                        <input type="file" name="csv_file" id="csvFile" accept=".csv,text/csv" required
                               style="position:absolute;inset:0;opacity:0;cursor:pointer" onchange="showFileName(this)">
                    </div>

                    <div id="replaceWarning" style="display:none;background:#FEF2F2;border:1px solid #FCA5A5;border-radius:var(--radius-md);padding:.75rem 1rem;margin-bottom:1rem;font-size:.875rem;color:#991B1B">
                        <i class="fas fa-exclamation-triangle"></i>
                        <strong>Warning:</strong> Full Replace will permanently delete all existing products before importing. This cannot be undone.
                    </div>

                    <div style="display:flex;gap:.75rem;align-items:center">
                        <button type="submit" class="btn btn-primary" style="flex:1">
                            <i class="fas fa-upload"></i> Import Now
                        </button>
                        <a href="/admin/import-export.php?export=1" class="btn btn-secondary" title="Download a template first">
                            <i class="fas fa-download"></i> Get Template
                        </a>
                    </div>
                    <p class="text-muted" style="font-size:.8rem;margin:.5rem 0 0">Tip: Export first to get the correct column format, edit in Excel, then import.</p>
                </form>
            </div>
        </div>
    </div>
</div>

<!-- Search + Filter -->
<div class="admin-card" style="margin-bottom:1rem">
    <div class="admin-card-body">
        <form method="GET" style="display:flex;gap:1rem;flex-wrap:wrap;align-items:flex-end">
            <div class="form-group mb-0" style="flex:1;min-width:200px">
                <label class="form-label">Search</label>
                <input type="text" name="search" class="form-input" placeholder="Name, SKU, category…"
                       value="<?= htmlspecialchars($search) ?>">
            </div>
            <div class="form-group mb-0">
                <label class="form-label">Category</label>
                <select name="category" class="form-select">
                    <option value="">All</option>
                    <?php foreach ($categories as $cat): ?>
                        <option value="<?= htmlspecialchars($cat['slug']) ?>"
                            <?= $catFilter === $cat['slug'] ? 'selected' : '' ?>>
                            <?= htmlspecialchars($cat['name']) ?>
                        </option>
                    <?php endforeach; ?>
                </select>
            </div>
            <button type="submit" class="btn btn-secondary"><i class="fas fa-filter"></i> Filter</button>
            <?php if ($search || $catFilter): ?>
                <a href="/admin/import-export.php" class="btn btn-secondary">Clear</a>
            <?php endif; ?>
            <span class="text-muted" style="line-height:2.5rem;font-size:.875rem"><?= count($products) ?> product<?= count($products) !== 1 ? 's' : '' ?></span>
        </form>
    </div>
</div>

<!-- Inventory Table -->
<div class="admin-card">
    <div class="admin-card-header">
        <span style="font-size:.85rem;color:var(--admin-text-muted)">
            <i class="fas fa-info-circle"></i> Click any price or stock cell to edit inline. Changes save instantly.
        </span>
    </div>
    <div class="admin-card-body" style="padding:0;overflow-x:auto">
        <?php if (empty($products)): ?>
            <div class="text-center text-muted" style="padding:3rem">No products found.</div>
        <?php else: ?>
        <table class="admin-table" style="min-width:900px">
            <thead>
                <tr>
                    <th>Product</th>
                    <th>SKU</th>
                    <th>Category</th>
                    <th style="text-align:right">Price</th>
                    <th style="text-align:right">Sale</th>
                    <th style="text-align:right">Cost</th>
                    <th style="text-align:center">Stock</th>
                    <th style="text-align:center">Active</th>
                    <th style="text-align:center">Actions</th>
                </tr>
            </thead>
            <tbody>
            <?php foreach ($products as $p):
                $isLow = $p['stock'] <= $p['low_stock_threshold'] && $p['is_active'];
            ?>
                <tr class="<?= !$p['is_active'] ? 'row-inactive' : '' ?>">
                    <td>
                        <strong><?= htmlspecialchars($p['name']) ?></strong>
                        <?php if ($isLow): ?>
                            <span class="badge badge-warning" style="margin-left:.4rem;font-size:.7rem">Low Stock</span>
                        <?php endif; ?>
                        <div style="font-size:.75rem;color:var(--admin-text-muted)"><?= htmlspecialchars($p['product_id']) ?></div>
                    </td>
                    <td class="editable-cell" data-field="sku" data-id="<?= $p['product_id'] ?>">
                        <span class="cell-display"><?= htmlspecialchars($p['sku'] ?? '—') ?></span>
                        <input class="cell-input form-input" style="display:none;width:90px;padding:.2rem .4rem;font-size:.85rem" value="<?= htmlspecialchars($p['sku'] ?? '') ?>">
                    </td>
                    <td><?= htmlspecialchars($p['category'] ?? '—') ?></td>
                    <td class="editable-cell" data-field="price" data-id="<?= $p['product_id'] ?>" style="text-align:right">
                        <span class="cell-display">$<?= number_format($p['price'], 2) ?></span>
                        <input class="cell-input form-input" style="display:none;width:80px;padding:.2rem .4rem;font-size:.85rem;text-align:right" value="<?= $p['price'] ?>">
                    </td>
                    <td class="editable-cell" data-field="sale_price" data-id="<?= $p['product_id'] ?>" style="text-align:right">
                        <span class="cell-display"><?= $p['sale_price'] ? '$'.number_format($p['sale_price'],2) : '<span style="color:var(--admin-text-muted)">—</span>' ?></span>
                        <input class="cell-input form-input" style="display:none;width:80px;padding:.2rem .4rem;font-size:.85rem;text-align:right" value="<?= $p['sale_price'] ?? '' ?>" placeholder="none">
                    </td>
                    <td class="editable-cell" data-field="cost_price" data-id="<?= $p['product_id'] ?>" style="text-align:right">
                        <span class="cell-display"><?= $p['cost_price'] ? '$'.number_format($p['cost_price'],2) : '<span style="color:var(--admin-text-muted)">—</span>' ?></span>
                        <input class="cell-input form-input" style="display:none;width:80px;padding:.2rem .4rem;font-size:.85rem;text-align:right" value="<?= $p['cost_price'] ?? '' ?>" placeholder="none">
                    </td>
                    <td class="editable-cell" data-field="stock" data-id="<?= $p['product_id'] ?>" style="text-align:center">
                        <span class="cell-display" style="font-weight:600;color:<?= $isLow ? 'var(--color-warning)' : 'inherit' ?>"><?= $p['stock'] ?></span>
                        <input class="cell-input form-input" style="display:none;width:70px;padding:.2rem .4rem;font-size:.85rem;text-align:center" value="<?= $p['stock'] ?>">
                    </td>
                    <td style="text-align:center">
                        <label class="toggle-switch" title="Toggle active">
                            <input type="checkbox" class="active-toggle"
                                   data-id="<?= $p['product_id'] ?>"
                                   <?= $p['is_active'] ? 'checked' : '' ?>>
                            <span class="toggle-slider"></span>
                        </label>
                    </td>
                    <td style="text-align:center;white-space:nowrap">
                        <a href="/admin/product-edit.php?id=<?= $p['product_id'] ?>" class="btn btn-sm btn-secondary" title="Full Edit">
                            <i class="fas fa-edit"></i>
                        </a>
                        <form method="POST" style="display:inline">
                            <input type="hidden" name="action" value="delete">
                            <input type="hidden" name="product_id" value="<?= $p['product_id'] ?>">
                            <button type="submit" class="btn btn-sm btn-danger" data-confirm="Delete <?= htmlspecialchars(addslashes($p['name'])) ?>?">
                                <i class="fas fa-trash"></i>
                            </button>
                        </form>
                    </td>
                </tr>
            <?php endforeach; ?>
            </tbody>
        </table>
        <?php endif; ?>
    </div>
</div>

<style>
.hidden { display: none !important; }

.row-inactive td { opacity: .5; }

.editable-cell {
    cursor: pointer;
    position: relative;
}
.editable-cell:hover .cell-display {
    background: rgba(255,94,26,.08);
    border-radius: 4px;
    padding: 2px 6px;
    outline: 1px dashed var(--admin-primary);
}
.editable-cell.editing .cell-display { display: none; }
.editable-cell.editing .cell-input   { display: inline-block !important; }
.editable-cell .saving-dot {
    display: none;
    color: var(--admin-primary);
    font-size: .75rem;
    margin-left: .3rem;
}

/* Toggle switch */
.toggle-switch {
    position: relative; display: inline-block;
    width: 36px; height: 20px; cursor: pointer;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute; inset: 0;
    background: var(--color-border); border-radius: 20px;
    transition: .2s;
}
.toggle-slider::before {
    content: ''; position: absolute;
    width: 14px; height: 14px; left: 3px; bottom: 3px;
    background: white; border-radius: 50%; transition: .2s;
}
.toggle-switch input:checked + .toggle-slider { background: var(--admin-primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(16px); }

#csvDrop.drag-active { border-color: var(--admin-primary); background: rgba(255,94,26,.04); }
</style>

<script>
/* ── Import panel mode ───────────────────────────── */
function setMode(radio) {
    document.getElementById('importModeField').value = radio.value;
    document.getElementById('replaceWarning').style.display = radio.value === 'replace' ? '' : 'none';
    document.getElementById('modeSmart').style.borderColor  = radio.value === 'smart'   ? 'var(--admin-primary)' : 'var(--color-border)';
    document.getElementById('modeReplace').style.borderColor = radio.value === 'replace' ? 'var(--color-error)'   : 'var(--color-border)';
}

function showFileName(input) {
    if (input.files[0]) {
        document.getElementById('csvFileName').textContent = input.files[0].name;
    }
}

function confirmImport() {
    var mode = document.getElementById('importModeField').value;
    if (mode === 'replace') {
        return confirm('WARNING: Full Replace will DELETE all existing products and reimport from the CSV.\n\nThis cannot be undone. Are you sure?');
    }
    var file = document.getElementById('csvFile').files[0];
    if (!file) { alert('Please select a CSV file.'); return false; }
    return confirm('Import ' + file.name + '?\n\nSmart Update will update existing products and add/remove to match the file.');
}

/* ── CSV drag & drop ─────────────────────────────── */
var drop = document.getElementById('csvDrop');
['dragenter','dragover'].forEach(function(e) {
    drop.addEventListener(e, function(ev) { ev.preventDefault(); drop.classList.add('drag-active'); });
});
['dragleave','drop'].forEach(function(e) {
    drop.addEventListener(e, function(ev) { ev.preventDefault(); drop.classList.remove('drag-active'); });
});
drop.addEventListener('drop', function(ev) {
    var f = ev.dataTransfer.files[0];
    if (f) {
        var dt = new DataTransfer();
        dt.items.add(f);
        document.getElementById('csvFile').files = dt.files;
        document.getElementById('csvFileName').textContent = f.name;
    }
});

/* ── Inline cell editing ─────────────────────────── */
document.querySelectorAll('.editable-cell').forEach(function(cell) {
    var display = cell.querySelector('.cell-display');
    var input   = cell.querySelector('.cell-input');
    var pid     = cell.dataset.id;
    var field   = cell.dataset.field;

    cell.addEventListener('click', function(e) {
        if (cell.classList.contains('editing')) return;
        cell.classList.add('editing');
        input.style.display = 'inline-block';
        input.focus();
        input.select();
    });

    function save() {
        cell.classList.remove('editing');
        var val = input.value;
        var fd = new FormData();
        fd.append('action', 'inline_edit');
        fd.append('product_id', pid);
        fd.append('field', field);
        fd.append('value', val);

        fetch('/admin/import-export.php', { method: 'POST', body: fd })
            .then(function(r) { return r.json(); })
            .then(function(data) {
                if (data.ok) {
                    // Refresh display text
                    if (field === 'sku') {
                        display.textContent = val || '—';
                    } else if (field === 'stock') {
                        display.textContent = val;
                    } else {
                        display.innerHTML = val !== '' ? '$' + parseFloat(val).toFixed(2) : '<span style="color:var(--admin-text-muted)">—</span>';
                    }
                }
            });
    }

    input.addEventListener('blur',  save);
    input.addEventListener('keydown', function(e) {
        if (e.key === 'Enter')  { e.preventDefault(); save(); }
        if (e.key === 'Escape') { cell.classList.remove('editing'); input.value = input.defaultValue; }
    });
});

/* ── Active toggle ───────────────────────────────── */
document.querySelectorAll('.active-toggle').forEach(function(cb) {
    cb.addEventListener('change', function() {
        var fd = new FormData();
        fd.append('action', 'inline_edit');
        fd.append('product_id', this.dataset.id);
        fd.append('field', 'is_active');
        fd.append('value', this.checked ? 1 : 0);
        fetch('/admin/import-export.php', { method: 'POST', body: fd });
        var row = this.closest('tr');
        if (row) row.classList.toggle('row-inactive', !this.checked);
    });
});
</script>

<?php require_once __DIR__ . '/includes/footer.php'; ?>