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Viewing: InventariosController.php

<?php
use PhpOffice\PhpSpreadsheet\IOFactory;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Style\Alignment;
use PhpOffice\PhpSpreadsheet\Style\Border;
use PhpOffice\PhpSpreadsheet\Style\Fill;
use PhpOffice\PhpSpreadsheet\Style\NumberFormat;

class InventariosController
{
    private function ensureCsrf(): string
    {
        if (empty($_SESSION['csrf'])) {
            $_SESSION['csrf'] = bin2hex(random_bytes(32));
        }
        return $_SESSION['csrf'];
    }

    private function collectInventoryFilters(): array
    {
        return [
            'q' => trim($_GET['q'] ?? ''),
            'category_id' => $_GET['category_id'] ?? '',
            'status' => $_GET['status'] ?? '',
        ];
    }

    private function fetchAllItems(array $filters): array
    {
        $res = InventoryItem::paginate($filters, 1, 100000);
        return $res['items'] ?? [];
    }

    private function describeInventoryFilters(array $filters): string
    {
        $parts = [];
        if (!empty($filters['q'])) { $parts[] = 'Búsqueda: "' . $filters['q'] . '"'; }
        if (!empty($filters['category_id'])) { $parts[] = 'Categoría ID: ' . (int)$filters['category_id']; }
        if (!empty($filters['status'])) { $parts[] = 'Estado: ' . $filters['status']; }
        return $parts ? implode(' | ', $parts) : 'Sin filtros';
    }

    public function index(): void
    {
        requireAuth(['ADMIN','CAJERO']);
        // Asegurar categoría "Venta" activa y disponible
        try { InventoryCategory::ensureByName('Venta', 'Artículos para venta'); } catch (Throwable $e) { /* noop */ }
        $csrf = $this->ensureCsrf();
        $filters = $this->collectInventoryFilters();
        $page = max(1, (int)($_GET['page'] ?? 1));
        $perPage = max(1, min(100, (int)($_GET['perPage'] ?? 15)));

        $result = InventoryItem::paginate($filters, $page, $perPage);
        $items = $result['items'];
        $total = $result['total'];
        $lastPage = $result['lastPage'];
        $page = $result['page'];
        $perPage = $result['perPage'];

        $categories = InventoryCategory::active();
        $statuses = ['Activo','Inactivo','Baja'];

        require __DIR__ . '/../views/inventarios/index.php';
    }

    public function create(): void
    {
        requireAuth(['ADMIN']);
        // Asegurar categoría "Venta" para permitir selección inmediata
        try { InventoryCategory::ensureByName('Venta', 'Artículos para venta'); } catch (Throwable $e) { /* noop */ }
        $csrf = $this->ensureCsrf();
        $categories = InventoryCategory::active();
        $statuses = ['Activo','Inactivo','Baja'];
        $item = [
            'category_id' => '',
            'asset_code' => '',
            'name' => '',
            'description' => '',
            'acquisition_date' => date('Y-m-d'),
            'unit' => 'Unidad',
            'current_quantity' => 0,
            'minimum_quantity' => 0,
            'unit_cost' => 0,
            'status' => 'Activo',
            'depreciation_months' => '',
            'location' => '',
        ];
        require __DIR__ . '/../views/inventarios/create.php';
    }

    public function store(): void
    {
        requireAuth(['ADMIN']);
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') { redirect('inventarios.index'); }
        $token = $_POST['csrf'] ?? '';
        if (!$token || !isset($_SESSION['csrf']) || !hash_equals($_SESSION['csrf'], $token)) {
            http_response_code(400);
            echo 'CSRF inválido';
            return;
        }

        $category_id = (int)($_POST['category_id'] ?? 0) ?: null;
        $asset_code = trim($_POST['asset_code'] ?? '');
        $name = trim($_POST['name'] ?? '');
        $description = trim($_POST['description'] ?? '');
        $acquisition_date = $_POST['acquisition_date'] ?? '';
        $unit = trim($_POST['unit'] ?? 'Unidad');
        $initial_qty = (float)($_POST['initial_quantity'] ?? 0);
        $minimum_qty = (float)($_POST['minimum_quantity'] ?? 0);
        $unit_cost = (float)($_POST['unit_cost'] ?? 0);
        $status = trim($_POST['status'] ?? 'Activo');
        $depreciation_months = $_POST['depreciation_months'] !== '' ? (int)$_POST['depreciation_months'] : null;
        $location = trim($_POST['location'] ?? '');

        if ($asset_code === '' || $name === '') {
            setFlashMessage('error', 'Código y nombre son obligatorios.');
            redirect('inventarios.create');
        }

        if ($initial_qty < 0 || $minimum_qty < 0 || $unit_cost < 0) {
            setFlashMessage('error', 'Los valores numéricos no pueden ser negativos.');
            redirect('inventarios.create');
        }

        try {
            $itemId = InventoryItem::create([
                'category_id' => $category_id,
                'asset_code' => $asset_code,
                'name' => $name,
                'description' => $description,
                'acquisition_date' => $acquisition_date ?: null,
                'unit' => $unit !== '' ? $unit : 'Unidad',
                'current_quantity' => 0,
                'minimum_quantity' => $minimum_qty,
                'unit_cost' => $unit_cost,
                'status' => in_array($status, ['Activo','Inactivo','Baja'], true) ? $status : 'Activo',
                'depreciation_months' => $depreciation_months,
                'location' => $location ?: null,
            ]);

            if ($initial_qty > 0) {
                InventoryTransaction::record(
                    $itemId,
                    'Ingreso',
                    $initial_qty,
                    $unit_cost,
                    'Registro inicial',
                    'Stock inicial al crear el activo',
                    (int)($_SESSION['user']['id'] ?? 0)
                );
            }

            setFlashMessage('success', 'Artículo registrado correctamente.');
            header('Location: ' . BASE_URL . '?route=inventarios.show&id=' . $itemId);
            exit;
        } catch (Throwable $e) {
            $msg = $e->getMessage();
            if ($e instanceof PDOException && (int)$e->getCode() === 23000) {
                $msg = 'El código del activo ya está registrado.';
            }
            setFlashMessage('error', 'No se pudo registrar el artículo: ' . $msg);
            redirect('inventarios.create');
        }
    }

    public function show(): void
    {
        requireAuth(['ADMIN','CAJERO']);
        $csrf = $this->ensureCsrf();
        $id = (int)($_GET['id'] ?? 0);
        if ($id <= 0) { http_response_code(400); echo 'ID inválido'; return; }
        $item = InventoryItem::find($id);
        if (!$item) { http_response_code(404); echo 'Artículo no encontrado'; return; }
        $categories = InventoryCategory::active();
        $transactions = InventoryTransaction::recentForItem($id, 25);
        $statuses = ['Activo','Inactivo','Baja'];
        require __DIR__ . '/../views/inventarios/show.php';
    }

    public function edit(): void
    {
        requireAuth(['ADMIN']);
        $csrf = $this->ensureCsrf();
        $id = (int)($_GET['id'] ?? 0);
        if ($id <= 0) { http_response_code(400); echo 'ID inválido'; return; }
        $item = InventoryItem::find($id);
        if (!$item) { http_response_code(404); echo 'Artículo no encontrado'; return; }
        $categories = InventoryCategory::active();
        $statuses = ['Activo','Inactivo','Baja'];
        require __DIR__ . '/../views/inventarios/edit.php';
    }

    public function update(): void
    {
        requireAuth(['ADMIN']);
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') { redirect('inventarios.index'); }
        $token = $_POST['csrf'] ?? '';
        if (!$token || !isset($_SESSION['csrf']) || !hash_equals($_SESSION['csrf'], $token)) {
            http_response_code(400);
            echo 'CSRF inválido';
            return;
        }
        $id = (int)($_POST['id'] ?? 0);
        if ($id <= 0) { redirect('inventarios.index'); }

        $item = InventoryItem::find($id);
        if (!$item) {
            setFlashMessage('error', 'Artículo no encontrado.');
            redirect('inventarios.index');
        }

        $category_id = (int)($_POST['category_id'] ?? 0) ?: null;
        $asset_code = trim($_POST['asset_code'] ?? '');
        $name = trim($_POST['name'] ?? '');
        $description = trim($_POST['description'] ?? '');
        $acquisition_date = $_POST['acquisition_date'] ?? '';
        $unit = trim($_POST['unit'] ?? 'Unidad');
        $minimum_qty = (float)($_POST['minimum_quantity'] ?? 0);
        $unit_cost = (float)($_POST['unit_cost'] ?? $item['unit_cost']);
        $status = trim($_POST['status'] ?? 'Activo');
        $depreciation_months = $_POST['depreciation_months'] !== '' ? (int)$_POST['depreciation_months'] : null;
        $location = trim($_POST['location'] ?? '');

        if ($asset_code === '' || $name === '') {
            setFlashMessage('error', 'Código y nombre son obligatorios.');
            header('Location: ' . BASE_URL . '?route=inventarios.edit&id=' . $id);
            exit;
        }
        if ($minimum_qty < 0 || $unit_cost < 0) {
            setFlashMessage('error', 'Los valores numéricos no pueden ser negativos.');
            header('Location: ' . BASE_URL . '?route=inventarios.edit&id=' . $id);
            exit;
        }

        try {
            InventoryItem::update($id, [
                'category_id' => $category_id,
                'asset_code' => $asset_code,
                'name' => $name,
                'description' => $description,
                'acquisition_date' => $acquisition_date ?: null,
                'unit' => $unit !== '' ? $unit : 'Unidad',
                'current_quantity' => $item['current_quantity'],
                'minimum_quantity' => $minimum_qty,
                'unit_cost' => $unit_cost,
                'status' => in_array($status, ['Activo','Inactivo','Baja'], true) ? $status : 'Activo',
                'depreciation_months' => $depreciation_months,
                'location' => $location ?: null,
            ]);
            setFlashMessage('success', 'Artículo actualizado correctamente.');
            header('Location: ' . BASE_URL . '?route=inventarios.show&id=' . $id);
            exit;
        } catch (Throwable $e) {
            $msg = $e->getMessage();
            if ($e instanceof PDOException && (int)$e->getCode() === 23000) {
                $msg = 'El código del activo ya está registrado.';
            }
            setFlashMessage('error', 'No se pudo actualizar el artículo: ' . $msg);
            header('Location: ' . BASE_URL . '?route=inventarios.edit&id=' . $id);
            exit;
        }
    }

    public function delete(): void
    {
        requireAuth(['ADMIN']);
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') { redirect('inventarios.index'); }
        $token = $_POST['csrf'] ?? '';
        if (!$token || !isset($_SESSION['csrf']) || !hash_equals($_SESSION['csrf'], $token)) {
            http_response_code(400);
            echo 'CSRF inválido';
            return;
        }
        $id = (int)($_POST['id'] ?? 0);
        if ($id <= 0) { redirect('inventarios.index'); }

        try {
            $ok = InventoryItem::delete($id);
            if ($ok) {
                setFlashMessage('success', 'Artículo eliminado.');
            } else {
                setFlashMessage('error', 'No se pudo eliminar el artículo.');
            }
        } catch (Throwable $e) {
            setFlashMessage('error', 'Error al eliminar el artículo: ' . $e->getMessage());
        }
        redirect('inventarios.index');
    }

    public function storeTransaction(): void
    {
        requireAuth(['ADMIN','CAJERO']);
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') { redirect('inventarios.index'); }
        $token = $_POST['csrf'] ?? '';
        if (!$token || !isset($_SESSION['csrf']) || !hash_equals($_SESSION['csrf'], $token)) {
            http_response_code(400);
            echo 'CSRF inválido';
            return;
        }
        $itemId = (int)($_POST['item_id'] ?? 0);
        if ($itemId <= 0) { redirect('inventarios.index'); }
        $item = InventoryItem::find($itemId);
        if (!$item) {
            setFlashMessage('error', 'Artículo no encontrado.');
            redirect('inventarios.index');
        }

        $type = trim($_POST['transaction_type'] ?? '');
        $quantity = (float)($_POST['quantity'] ?? 0);
        $unit_cost = ($_POST['unit_cost'] ?? '') !== '' ? (float)$_POST['unit_cost'] : null;
        $reference = trim($_POST['reference'] ?? '');
        $notes = trim($_POST['notes'] ?? '');
        $transacted_at = $_POST['transacted_at'] ?? date('Y-m-d H:i:s');

        if ($quantity <= 0) {
            setFlashMessage('error', 'La cantidad debe ser mayor a 0.');
            header('Location: ' . BASE_URL . '?route=inventarios.show&id=' . $itemId);
            exit;
        }

        try {
            InventoryTransaction::record(
                $itemId,
                $type,
                $quantity,
                $unit_cost,
                $reference ?: null,
                $notes ?: null,
                (int)($_SESSION['user']['id'] ?? 0),
                $transacted_at ?: null
            );
            setFlashMessage('success', 'Movimiento registrado.');
        } catch (Throwable $e) {
            setFlashMessage('error', 'No se pudo registrar el movimiento: ' . $e->getMessage());
        }
        header('Location: ' . BASE_URL . '?route=inventarios.show&id=' . $itemId);
        exit;
    }

    public function exportPdf(): void
    {
        requireAuth(['ADMIN','CAJERO']);
        $filters = $this->collectInventoryFilters();
        $rows = $this->fetchAllItems($filters);

        // Totales
        $totalValue = 0.0; $lowStock = 0;
        foreach ($rows as $r) {
            $qty = (float)($r['current_quantity'] ?? 0);
            $cost = (float)($r['unit_cost'] ?? 0);
            $min = (float)($r['minimum_quantity'] ?? 0);
            $totalValue += ($qty * $cost);
            if ($min > 0 && $qty < $min) { $lowStock++; }
        }

        // Intentar cargar Dompdf si existe
        $autoload = __DIR__ . '/../vendor/autoload.php';
        if (is_file($autoload)) { @require_once $autoload; }

        $html = $this->renderInventoryReportHtml($rows, $filters, $totalValue, $lowStock);

        if (class_exists('Dompdf\\Dompdf')) {
            $dompdf = new Dompdf\Dompdf();
            $dompdf->loadHtml($html);
            $dompdf->setPaper('A4', 'landscape');
            $dompdf->render();
            $filename = 'Inventario_' . date('Ymd_His') . '.pdf';
            $dompdf->stream($filename, ['Attachment' => true]);
            return;
        }

        // Fallback HTML imprimible
        header('Content-Type: text/html; charset=UTF-8');
        echo $html;
        echo '<script>window.addEventListener("load",()=>setTimeout(()=>window.print(),200));</script>';
    }

    public function exportExcel(): void
    {
        requireAuth(['ADMIN','CAJERO']);
        $filters = $this->collectInventoryFilters();
        $rows = $this->fetchAllItems($filters);

        $totalValue = 0.0; $lowStock = 0;
        foreach ($rows as $r) {
            $qty = (float)($r['current_quantity'] ?? 0);
            $cost = (float)($r['unit_cost'] ?? 0);
            $min = (float)($r['minimum_quantity'] ?? 0);
            $totalValue += ($qty * $cost);
            if ($min > 0 && $qty < $min) { $lowStock++; }
        }

        $autoload = __DIR__ . '/../vendor/autoload.php';
        if (is_file($autoload)) { @require_once $autoload; }
        if (!class_exists(Spreadsheet::class)) {
            http_response_code(500);
            echo 'PhpSpreadsheet no está disponible.';
            return;
        }

        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();
        $sheet->setTitle('Inventario');

        $headerColor = '173e62';
        $row = 1;
        $sheet->mergeCells("A{$row}:K{$row}");
        $sheet->setCellValue("A{$row}", 'SISCAPS - Reporte de Inventario');
        $sheet->getStyle("A{$row}")->getFont()->setBold(true)->setSize(15);
        $sheet->getStyle("A{$row}")->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);

        $row++;
        $sheet->mergeCells("A{$row}:K{$row}");
        $sheet->setCellValue("A{$row}", 'Generado: ' . date('d/m/Y'));

        $row++;
        $sheet->mergeCells("A{$row}:K{$row}");
        $sheet->setCellValue("A{$row}", 'Filtros: ' . $this->describeInventoryFilters($filters));

        $row++;
        $sheet->mergeCells("A{$row}:K{$row}");
        $sheet->setCellValue("A{$row}", 'Valor total del stock: ' . format_currency($totalValue) . ' | Bajo mínimo: ' . $lowStock);

        $row += 2;
        $headerRow = $row;
        $headers = [
            'Código',
            'Artículo',
            'Categoría',
            'Unidad',
            'Cantidad',
            'Mínimo',
            'Costo unitario',
            'Valor total',
            'Estado',
            'Ubicación',
            'Actualizado',
        ];
        $sheet->fromArray($headers, null, "A{$headerRow}");
        $sheet->getStyle("A{$headerRow}:K{$headerRow}")->applyFromArray([
            'font' => ['bold' => true, 'color' => ['rgb' => 'FFFFFF']],
            'fill' => [
                'fillType' => Fill::FILL_SOLID,
                'startColor' => ['rgb' => strtoupper($headerColor)],
            ],
            'alignment' => [
                'horizontal' => Alignment::HORIZONTAL_CENTER,
                'vertical' => Alignment::VERTICAL_CENTER,
            ],
            'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
        ]);

        $row = $headerRow + 1;
        foreach ($rows as $item) {
            $qty = (float)($item['current_quantity'] ?? 0);
            $min = (float)($item['minimum_quantity'] ?? 0);
            $unitCost = (float)($item['unit_cost'] ?? 0);
            $sheet->fromArray([
                $item['asset_code'] ?? '',
                $item['name'] ?? '',
                $item['category_name'] ?? '',
                $item['unit'] ?? 'Unidad',
                $qty,
                $min,
                $unitCost,
                $qty * $unitCost,
                $item['status'] ?? '',
                $item['location'] ?? '',
                format_datetime($item['updated_at'] ?? ''),
            ], null, "A{$row}");
            $row++;
        }

        $dataEndRow = $row - 1;
        if ($dataEndRow >= $headerRow + 1) {
            $sheet->getStyle("A" . ($headerRow + 1) . ":K{$dataEndRow}")->applyFromArray([
                'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_HAIR]],
                'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
            ]);
            $sheet->getStyle("E" . ($headerRow + 1) . ":H{$dataEndRow}")
                ->getNumberFormat()->setFormatCode(NumberFormat::FORMAT_NUMBER_COMMA_SEPARATED1);
            $sheet->setAutoFilter("A{$headerRow}:K{$dataEndRow}");
        }

        $sheet->mergeCells("A{$row}:G{$row}");
        $sheet->setCellValue("A{$row}", 'Totales');
        $sheet->setCellValue("H{$row}", $totalValue);
        $sheet->getStyle("A{$row}:K{$row}")->applyFromArray([
            'font' => ['bold' => true],
            'borders' => ['top' => ['borderStyle' => Border::BORDER_THIN]],
        ]);
        $sheet->getStyle("H{$row}")
            ->getNumberFormat()->setFormatCode(NumberFormat::FORMAT_NUMBER_COMMA_SEPARATED1);
        $row++;

        foreach (range('A', 'K') as $col) {
            $sheet->getColumnDimension($col)->setAutoSize(true);
        }
        $sheet->freezePane('A' . ($headerRow + 1));

        $filename = 'Inventario_' . date('Ymd_His') . '.xlsx';
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Cache-Control: max-age=0');

        $writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
        $writer->save('php://output');
        exit;
    }

    private function renderInventoryReportHtml(array $rows, array $filters, float $totalValue, int $lowStock): string
    {
        $generatedAt = date('d/m/Y H:i');
        $filtersDesc = $this->describeInventoryFilters($filters);

        $systemData = SystemData::get();
        $committeeName = trim((string)($systemData['committee_name'] ?? ''));
        if ($committeeName === '') {
            $committeeName = 'Comité de Agua Potable y Saneamiento';
        }
        $providerReg = trim((string)($systemData['provider_registration_number'] ?? ''));
        $ruc = trim((string)($systemData['ruc_number'] ?? ''));
        $municipality = trim((string)($systemData['municipality'] ?? ''));
        $department = trim((string)($systemData['department'] ?? ''));
        $physicalAddress = trim((string)($systemData['physical_address'] ?? ''));
        $phone = trim((string)($systemData['phone'] ?? ''));

        if ($physicalAddress !== '') {
            $maxAddr = 110;
            if (mb_strlen($physicalAddress) > $maxAddr) {
                $physicalAddress = rtrim(mb_substr($physicalAddress, 0, $maxAddr)) . '...';
            }
        }

        $locationLine = trim(implode(' - ', array_filter([$municipality, $department])));
        $regRucLine = trim(implode(' | ', array_filter([
            $providerReg !== '' ? ('Reg. prestador: ' . $providerReg) : '',
            $ruc !== '' ? ('RUC: ' . $ruc) : '',
        ])));
        $contactLine = trim(implode(' | ', array_filter([
            $physicalAddress !== '' ? ('Dir.: ' . $physicalAddress) : '',
            $phone !== '' ? ('Tel.: ' . $phone) : '',
        ])));

        $logoDataUri = null;
        $logoRel = trim((string)($systemData['logo_path'] ?? ''));
        if ($logoRel !== '') {
            $logoAbs = dirname(__DIR__) . '/public/' . ltrim($logoRel, '/');
            if (is_file($logoAbs)) {
                $ext = strtolower(pathinfo($logoAbs, PATHINFO_EXTENSION));
                $mimeMap = [
                    'png' => 'image/png',
                    'jpg' => 'image/jpeg',
                    'jpeg' => 'image/jpeg',
                    'webp' => 'image/webp',
                    'gif' => 'image/gif',
                ];
                $mime = $mimeMap[$ext] ?? 'application/octet-stream';
                $bin = @file_get_contents($logoAbs);
                if ($bin !== false) {
                    $logoDataUri = 'data:' . $mime . ';base64,' . base64_encode($bin);
                }
            }
        }

        ob_start();
        ?>
        <!doctype html>
        <html lang="es">
        <head>
            <meta charset="utf-8">
            <title>Informe de Inventario</title>
            <style>
                * { box-sizing: border-box; }
                body { font-family: Arial, Helvetica, sans-serif; font-size: 10px; color:#222; margin: 12px; }
                .membrete { border-bottom: 1px solid #ddd; padding-bottom: 6px; margin-bottom: 8px; }
                .membrete-table { width: 100%; border-collapse: collapse; table-layout: auto; }
                .membrete-logo { width: 64px; vertical-align: top; padding-right: 8px; }
                .membrete-logo img { width: 64px; height: 64px; object-fit: contain; }
                .membrete-info { vertical-align: top; }
                .membrete-right { width: 280px; vertical-align: top; text-align: right; }
                .membrete-title { font-size: 12px; font-weight: bold; margin: 0; line-height: 1.2; }
                .membrete-line { font-size: 9px; margin: 0; line-height: 1.2; color: #333; }
                .membrete-meta { font-size: 9px; color: #555; word-break: break-word; }
                table { width:100%; border-collapse: collapse; table-layout: fixed; }
                th, td { padding:5px 6px; border-bottom:1px solid #eee; text-align:left; font-size: 9px; vertical-align: top; word-wrap: break-word; }
                thead th { background:#f8f9fa; border-bottom:1px solid #ddd; }
                .right { text-align:right; }
                .danger { color:#b42318; font-weight:bold; }
            </style>
        </head>
        <body>
            <div class="membrete">
                <table class="membrete-table">
                    <tr>
                        <td class="membrete-logo">
                            <?php if (!empty($logoDataUri)): ?>
                                <img src="<?= htmlspecialchars($logoDataUri) ?>" alt="Logo">
                            <?php endif; ?>
                        </td>
                        <td class="membrete-info">
                            <p class="membrete-title"><?= htmlspecialchars($committeeName) ?></p>
                            <?php if ($regRucLine !== ''): ?>
                                <p class="membrete-line"><?= htmlspecialchars($regRucLine) ?></p>
                            <?php endif; ?>
                            <?php if ($locationLine !== ''): ?>
                                <p class="membrete-line"><?= htmlspecialchars($locationLine) ?></p>
                            <?php endif; ?>
                            <?php if ($contactLine !== ''): ?>
                                <p class="membrete-line"><?= htmlspecialchars($contactLine) ?></p>
                            <?php endif; ?>
                        </td>
                        <td class="membrete-right">
                            <p class="membrete-title">Inventario</p>
                            <div class="membrete-meta"><strong>Total artículos:</strong> <?= count($rows) ?></div>
                            <div class="membrete-meta"><strong>Valor stock:</strong> <?= format_currency($totalValue) ?></div>
                            <div class="membrete-meta"><strong>Bajo mínimo:</strong> <?= (int)$lowStock ?></div>
                            <div class="membrete-meta"><strong>Generado:</strong> <?= htmlspecialchars($generatedAt) ?></div>
                            <div class="membrete-meta"><strong>Filtro:</strong> <?= htmlspecialchars($filtersDesc) ?></div>
                        </td>
                    </tr>
                </table>
            </div>

            <table>
                <thead>
                    <tr>
                        <th style="width:12%">Código</th>
                        <th>Artículo</th>
                        <th style="width:14%">Categoría</th>
                        <th style="width:12%" class="right">Cantidad</th>
                        <th style="width:12%" class="right">Mínimo</th>
                        <th style="width:12%" class="right">Costo unitario</th>
                        <th style="width:12%" class="right">Valor stock</th>
                        <th style="width:10%">Estado</th>
                    </tr>
                </thead>
                <tbody>
                <?php if ($rows): foreach ($rows as $r):
                    $qty = (float)($r['current_quantity'] ?? 0);
                    $min = (float)($r['minimum_quantity'] ?? 0);
                    $cost = (float)($r['unit_cost'] ?? 0);
                    $value = $qty * $cost;
                    $isLow = ($min > 0 && $qty < $min);
                ?>
                    <tr>
                        <td><?= htmlspecialchars($r['asset_code'] ?? '') ?></td>
                        <td><?= htmlspecialchars($r['name'] ?? '') ?></td>
                        <td><?= htmlspecialchars($r['category_name'] ?? 'Sin categoría') ?></td>
                        <td class="right<?= $isLow ? ' danger' : '' ?>"><?= format_num($qty, 2) ?> <?= htmlspecialchars($r['unit'] ?? '') ?></td>
                        <td class="right"><?= format_num($min, 2) ?> <?= htmlspecialchars($r['unit'] ?? '') ?></td>
                        <td class="right"><?= format_currency($cost) ?></td>
                        <td class="right"><strong><?= format_currency($value) ?></strong></td>
                        <td><?= htmlspecialchars($r['status'] ?? '') ?></td>
                    </tr>
                <?php endforeach; else: ?>
                    <tr><td colspan="8" class="muted">No hay artículos para los filtros seleccionados.</td></tr>
                <?php endif; ?>
                </tbody>
            </table>
        </body>
        </html>
        <?php
        return (string)ob_get_clean();
    }
}
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