<?php
declare(strict_types=1);

require_once __DIR__ . '/includes/layout.php'; require_role('admin');

// Helper to validate date
function validate_date($date, $format = 'Y-m-d') {
    $d = DateTime::createFromFormat($format, $date);
    return $d && $d->format($format) === $date;
}

// Params
$reportType = $_GET['type'] ?? 'countries_origin'; // countries_origin, countries_dest, cities_origin, cities_dest, shippers
$startDate = $_GET['start_date'] ?? date('Y-m-01'); // Default to first day of current month
$endDate = $_GET['end_date'] ?? date('Y-m-t');   // Default to last day of current month
$export = $_GET['export'] ?? null;

if (!validate_date($startDate)) $startDate = date('Y-m-01');
if (!validate_date($endDate)) $endDate = date('Y-m-t');

// Build Query
$where = "s.payment_status = 'paid' AND DATE(s.created_at) BETWEEN ? AND ?";
$params = [$startDate, $endDate];

$groupBy = '';
$selectName = '';
$join = '';
$orderBy = 'total_amount DESC';

$pageTitle = t('shipments_by_origin_country');

switch ($reportType) {
    case 'countries_origin':
        $selectName = "COALESCE(co.name_en, 'Unknown') as name";
        $join = "LEFT JOIN cities c ON s.origin_city = c.name_en 
                 LEFT JOIN countries co ON c.country_id = co.id";
        $groupBy = "co.name_en";
        $pageTitle = t('shipments_by_origin_country');
        break;

    case 'countries_dest':
        $selectName = "COALESCE(co.name_en, 'Unknown') as name";
        $join = "LEFT JOIN cities c ON s.destination_city = c.name_en 
                 LEFT JOIN countries co ON c.country_id = co.id";
        $groupBy = "co.name_en";
        $pageTitle = t('shipments_by_dest_country');
        break;

    case 'cities_origin':
        $selectName = "s.origin_city as name";
        $groupBy = "s.origin_city";
        $pageTitle = t('shipments_by_origin_city');
        break;

    case 'cities_dest':
        $selectName = "s.destination_city as name";
        $groupBy = "s.destination_city";
        $pageTitle = t('shipments_by_dest_city');
        break;

    case 'shippers':
        $selectName = "s.shipper_name as name"; // simplified, could join users table
        $groupBy = "s.shipper_name";
        $pageTitle = t('shipments_by_shipper');
        break;
        
    default:
        $reportType = 'countries_origin';
        $selectName = "COALESCE(co.name_en, 'Unknown') as name";
        $join = "LEFT JOIN cities c ON s.origin_city = c.name_en 
                 LEFT JOIN countries co ON c.country_id = co.id";
        $groupBy = "co.name_en";
        $pageTitle = t('shipments_by_origin_country');
        break;
}

$sql = "
    SELECT 
        $selectName,
        COUNT(s.id) as shipment_count,
        SUM(s.total_price) as total_amount,
        SUM(s.platform_fee) as total_profit
    FROM shipments s
    $join
    WHERE $where
    GROUP BY $groupBy
    ORDER BY $orderBy
";

try {
    $stmt = db()->prepare($sql);
    $stmt->execute($params);
    $results = $stmt->fetchAll();
} catch (PDOException $e) {
    $results = [];
    $error = "Database error: " . $e->getMessage();
}

// Calculate totals
$totalShipments = 0;
$grandTotalAmount = 0.0;
$grandTotalProfit = 0.0;

foreach ($results as $row) {
    $totalShipments += $row['shipment_count'];
    $grandTotalAmount += $row['total_amount'];
    $grandTotalProfit += $row['total_profit'];
}

// Handle CSV Export
if ($export === 'csv') {
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="report_' . $reportType . '_' . date('Ymd') . '.csv"');
    
    $out = fopen('php://output', 'w');
    
    // Header
    fputcsv($out, ['Name', 'Shipments', 'Total Amount', 'Profit']);
    
    // Rows
    foreach ($results as $row) {
        fputcsv($out, [
            $row['name'],
            $row['shipment_count'],
            number_format((float)$row['total_amount'], 2, '.', ''),
            number_format((float)$row['total_profit'], 2, '.', '')
        ]);
    }
    
    // Footer
    fputcsv($out, ['Total', $totalShipments, number_format($grandTotalAmount, 2, '.', ''), number_format($grandTotalProfit, 2, '.', '')]);
    
    fclose($out);
    exit;
}

render_header(t('summary_report'), 'reports_summary', true);
?>

<div class="row g-0">
    <div class="col-md-2 bg-white border-end min-vh-100 d-print-none">
        <?php render_admin_sidebar('reports_summary'); ?>
    </div>
    <div class="col-md-10 p-4">
        
        <!-- Print Header -->
        <div class="d-none d-print-block mb-4">
            <div class="row align-items-center mb-4">
                <div class="col-6">
                    <?php 
                    $logoPath = get_setting('logo_path');
                    if ($logoPath): ?>
                        <img src="<?= e($logoPath) ?>" alt="Company Logo" style="max-height: 80px; width: auto;">
                    <?php else: ?>
                        <h2 class="fw-bold mb-0 text-dark"><?= e(get_setting('company_name', 'CargoLink')) ?></h2>
                    <?php endif; ?>
                </div>
                <div class="col-6 text-end">
                    <h3 class="mb-1 text-dark fw-bold"><?= e(t('summary_report')) ?></h3>
                    <p class="mb-0 text-muted small">
                        <?= e(get_setting('company_address')) ?><br>
                        <?= e(get_setting('company_email')) ?> | <?= e(get_setting('company_phone')) ?>
                    </p>
                    <p class="mb-0 text-muted small mt-2">
                        <?= e(t('generated')) ?>: <?= date('d M Y, H:i') ?>
                    </p>
                </div>
            </div>
            <div class="row mb-4">
                <div class="col-12">
                    <div class="border p-3 rounded bg-light">
                        <div class="row">
                            <div class="col-6">
                                <strong class="text-muted d-block small text-uppercase"><?= e(t('report_type')) ?></strong>
                                <span class="fs-5 fw-bold text-dark"><?= e($pageTitle) ?></span>
                            </div>
                            <div class="col-6 text-end">
                                <strong class="text-muted d-block small text-uppercase"><?= e(t('period')) ?></strong>
                                <span class="fs-5 fw-bold text-dark"><?= e($startDate) ?> &mdash; <?= e($endDate) ?></span>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <div class="d-flex justify-content-between align-items-center mb-4 d-print-none">
            <div>
                <h1 class="section-title mb-1"><?= e(t('summary_report')) ?></h1>
                <p class="muted mb-0"><?= e(t('analyze_performance')) ?></p>
            </div>
            <div>
                 <a href="?type=<?= e($reportType) ?>&start_date=<?= e($startDate) ?>&end_date=<?= e($endDate) ?>&export=csv" class="btn btn-outline-primary btn-sm me-2">
                    <i class="bi bi-download me-2"></i><?= e(t('export_csv')) ?>
                 </a>
                 <button class="btn btn-outline-secondary btn-sm" onclick="window.print()">
                    <i class="bi bi-printer me-2"></i><?= e(t('print')) ?>
                 </button>
            </div>
        </div>

        <div class="panel p-4 mb-4 d-print-none">
            <form method="get" class="row g-3 align-items-end">
                <div class="col-md-3">
                    <label class="form-label small text-muted"><?= e(t('report_type')) ?></label>
                    <select name="type" class="form-select" onchange="this.form.submit()">
                        <option value="countries_origin" <?= $reportType === 'countries_origin' ? 'selected' : '' ?>><?= e(t('shipments_by_origin_country')) ?></option>
                        <option value="countries_dest" <?= $reportType === 'countries_dest' ? 'selected' : '' ?>><?= e(t('shipments_by_dest_country')) ?></option>
                        <option value="cities_origin" <?= $reportType === 'cities_origin' ? 'selected' : '' ?>><?= e(t('shipments_by_origin_city')) ?></option>
                        <option value="cities_dest" <?= $reportType === 'cities_dest' ? 'selected' : '' ?>><?= e(t('shipments_by_dest_city')) ?></option>
                        <option value="shippers" <?= $reportType === 'shippers' ? 'selected' : '' ?>><?= e(t('shipments_by_shipper')) ?></option>
                    </select>
                </div>
                <div class="col-md-3">
                    <label class="form-label small text-muted"><?= e(t('start_date')) ?></label>
                    <input type="date" name="start_date" class="form-control" value="<?= e($startDate) ?>">
                </div>
                <div class="col-md-3">
                    <label class="form-label small text-muted"><?= e(t('end_date')) ?></label>
                    <input type="date" name="end_date" class="form-control" value="<?= e($endDate) ?>">
                </div>
                <div class="col-md-2">
                    <button type="submit" class="btn btn-primary w-100"><?= e(t('apply_filter')) ?></button>
                </div>
            </form>
        </div>

        <div class="panel p-0 print-no-shadow">
            <div class="p-3 border-bottom bg-light d-flex justify-content-between align-items-center d-print-none">
                <h5 class="mb-0 fw-bold"><?= e($pageTitle) ?></h5>
                <span class="badge bg-secondary"><?= e($startDate) ?> to <?= e($endDate) ?></span>
            </div>
            
            <?php if (empty($results)): ?>
                <div class="p-5 text-center text-muted">
                    <i class="bi bi-bar-chart fs-1 mb-3 d-block"></i>
                    <p class="mb-0"><?= e(t('no_paid_shipments')) ?></p>
                </div>
            <?php else: ?>
                <div class="table-responsive">
                    <table class="table table-hover mb-0 align-middle">
                        <thead>
                            <tr>
                                <th class="ps-4"><?= e(t('name')) ?></th>
                                <th class="text-center"><?= e(t('stats_shipments')) ?></th>
                                <th class="text-end"><?= e(t('total_amount')) ?></th>
                                <th class="text-end pe-4"><?= e(t('profit')) ?></th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php foreach ($results as $row): ?>
                                <tr>
                                    <td class="ps-4 fw-medium"><?= e($row['name']) ?></td>
                                    <td class="text-center"><?= number_format((int)$row['shipment_count']) ?></td>
                                    <td class="text-end text-dark"><?= format_currency((float)$row['total_amount']) ?></td>
                                    <td class="text-end pe-4 text-success fw-bold"><?= format_currency((float)$row['total_profit']) ?></td>
                                </tr>
                            <?php endforeach; ?>
                        </tbody>
                        <tfoot class="table-light fw-bold border-top">
                            <tr>
                                <td class="ps-4"><?= e(t('total_label')) ?></td>
                                <td class="text-center"><?= number_format($totalShipments) ?></td>
                                <td class="text-end"><?= format_currency($grandTotalAmount) ?></td>
                                <td class="text-end pe-4 text-success"><?= format_currency($grandTotalProfit) ?></td>
                            </tr>
                        </tfoot>
                    </table>
                </div>
            <?php endif; ?>
            
            <!-- Print Footer -->
             <div class="d-none d-print-block print-footer border-top pt-2">
                <div class="row text-muted small">
                    <div class="col-6">
                        <?= e(t('printed_by')) ?>: <?= e($_SESSION['user_name'] ?? 'Admin') ?>
                    </div>
                    <div class="col-6 text-end">
                        <?= e(t('generated')) ?>: <?= date('d M Y H:i') ?>
                    </div>
                </div>
             </div>
        </div>
    </div>
</div>

<?php render_footer(); ?>