<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

/**
 * Get Cart (order details with line items and calculations)
 * POST: { OrderID: int }
 */

$data = readJsonBody();
$OrderID = (int) ($data['OrderID'] ?? 0);

if ($OrderID <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_orderid', 'MESSAGE' => 'OrderID is required.']);
}

try {
    $qOrder = queryOne("
        SELECT
            o.ID, o.UUID, o.UserID, o.BusinessID, o.DeliveryMultiplier,
            o.OrderTypeID, o.DeliveryFee, o.StatusID, o.AddressID, o.PaymentID,
            o.PaymentStatus, o.Remarks, o.AddedOn, o.LastEditedOn, o.SubmittedOn,
            o.ServicePointID,
            sp.Name AS ServicePointName
        FROM Orders o
        LEFT JOIN ServicePoints sp ON sp.ID = o.ServicePointID
        WHERE o.ID = ?
        LIMIT 1
    ", [$OrderID]);

    if (!$qOrder) {
        apiAbort(['OK' => false, 'ERROR' => 'not_found', 'MESSAGE' => 'Order not found.']);
    }

    // Get business info
    $qBusiness = queryOne(
        "SELECT DeliveryFlatFee, OrderTypes, TaxRate, PayfritFee FROM Businesses WHERE ID = ? LIMIT 1",
        [(int) $qOrder['BusinessID']]
    );

    $businessDeliveryFee = $qBusiness ? (float) $qBusiness['DeliveryFlatFee'] : 0;
    $businessTaxRate = ($qBusiness && is_numeric($qBusiness['TaxRate'])) ? (float) $qBusiness['TaxRate'] : 0;
    $businessPayfritFee = ($qBusiness && is_numeric($qBusiness['PayfritFee'])) ? (float) $qBusiness['PayfritFee'] : 0.05;
    $businessOrderTypes = ($qBusiness && trim($qBusiness['OrderTypes'] ?? '') !== '') ? $qBusiness['OrderTypes'] : '1,2,3';
    $businessOrderTypesArray = explode(',', $businessOrderTypes);

    // Get line items
    $qLI = queryTimed("
        SELECT
            oli.ID, oli.ParentOrderLineItemID, oli.OrderID, oli.ItemID,
            oli.StatusID, oli.Price, oli.Quantity, oli.Remark, oli.IsDeleted, oli.AddedOn,
            i.Name, i.ParentItemID, i.IsCheckedByDefault,
            parent.Name AS ItemParentName
        FROM OrderLineItems oli
        INNER JOIN Items i ON i.ID = oli.ItemID
        LEFT JOIN Items parent ON parent.ID = i.ParentItemID
        WHERE oli.OrderID = ? AND oli.IsDeleted = 0
        ORDER BY oli.ID
    ", [$OrderID]);

    $rows = [];
    $subtotal = 0;
    foreach ($qLI as $r) {
        $rows[] = [
            'OrderLineItemID'       => (int) $r['ID'],
            'ParentOrderLineItemID' => (int) $r['ParentOrderLineItemID'],
            'OrderID'               => (int) $r['OrderID'],
            'ItemID'                => (int) $r['ItemID'],
            'StatusID'              => (int) $r['StatusID'],
            'Price'                 => (float) $r['Price'],
            'Quantity'              => (int) $r['Quantity'],
            'Remark'                => $r['Remark'] ?? '',
            'IsDeleted'             => (int) $r['IsDeleted'],
            'AddedOn'               => $r['AddedOn'],
            'Name'                  => $r['Name'] ?? '',
            'ParentItemID'          => (int) $r['ParentItemID'],
            'ItemParentName'        => $r['ItemParentName'] ?? '',
            'IsCheckedByDefault'    => (int) $r['IsCheckedByDefault'],
        ];
        // Subtotal from root items only
        if ((int) $r['ParentOrderLineItemID'] === 0) {
            $subtotal += (float) $r['Price'] * (int) $r['Quantity'];
        }
    }

    $taxAmount = $subtotal * $businessTaxRate;
    $deliveryFee = ((int) $qOrder['OrderTypeID'] === 3) ? (float) $qOrder['DeliveryFee'] : 0;
    $total = $subtotal + $taxAmount + $deliveryFee;

    jsonResponse([
        'OK'    => true,
        'ERROR' => '',
        'ORDER' => [
            'OrderID'             => (int) $qOrder['ID'],
            'UUID'                => $qOrder['UUID'] ?? '',
            'UserID'              => (int) $qOrder['UserID'],
            'BusinessID'          => (int) $qOrder['BusinessID'],
            'DeliveryMultiplier'  => (float) $qOrder['DeliveryMultiplier'],
            'OrderTypeID'         => (int) $qOrder['OrderTypeID'],
            'DeliveryFee'         => $deliveryFee,
            'BusinessDeliveryFee' => $businessDeliveryFee,
            'TaxRate'             => $businessTaxRate,
            'PayfritFee'          => $businessPayfritFee,
            'Subtotal'            => $subtotal,
            'Tax'                 => $taxAmount,
            'Total'               => $total,
            'OrderTypes'          => $businessOrderTypesArray,
            'StatusID'            => (int) $qOrder['StatusID'],
            'AddressID'           => (int) ($qOrder['AddressID'] ?? 0),
            'PaymentID'           => (int) ($qOrder['PaymentID'] ?? 0),
            'PaymentStatus'       => $qOrder['PaymentStatus'] ?? '',
            'Remarks'             => $qOrder['Remarks'] ?? '',
            'AddedOn'             => $qOrder['AddedOn'],
            'LastEditedOn'        => $qOrder['LastEditedOn'],
            'SubmittedOn'         => $qOrder['SubmittedOn'],
            'ServicePointID'      => (int) ($qOrder['ServicePointID'] ?? 0),
            'ServicePointName'    => $qOrder['ServicePointName'] ?? '',
        ],
        'ORDERLINEITEMS' => $rows,
    ]);

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => 'server_error', 'MESSAGE' => 'DB error loading cart', 'DETAIL' => $e->getMessage()]);
}