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

/**
 * List Orders for KDS (Kitchen Display System)
 * POST: { BusinessID: int, ServicePointID?: int, StationID?: int }
 */

$data = readJsonBody();
$BusinessID = (int) ($data['BusinessID'] ?? 0);
$ServicePointID = (int) ($data['ServicePointID'] ?? 0);
$StationID = (int) ($data['StationID'] ?? 0);

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

try {
    // Build WHERE clause
    $whereClauses = ['o.BusinessID = ?'];
    $params = [$BusinessID];

    if ($ServicePointID > 0) {
        $whereClauses[] = 'o.ServicePointID = ?';
        $params[] = $ServicePointID;
    }

    $whereClauses[] = 'o.StatusID >= 1';
    $whereClauses[] = 'o.StatusID < 4';

    $whereSQL = implode(' AND ', $whereClauses);

    if ($StationID > 0) {
        $stationParams = array_merge($params, [$StationID]);
        $qOrders = queryTimed("
            SELECT DISTINCT
                o.ID, o.UUID, o.UserID, o.BusinessID, o.OrderTypeID, o.StatusID,
                o.ServicePointID, o.Remarks,
                DATE_FORMAT(o.SubmittedOn, '%Y-%m-%dT%H:%i:%sZ') AS SubmittedOn,
                DATE_FORMAT(o.LastEditedOn, '%Y-%m-%dT%H:%i:%sZ') AS LastEditedOn,
                sp.Name AS Name,
                u.FirstName, u.LastName
            FROM Orders o
            LEFT JOIN ServicePoints sp ON sp.ID = o.ServicePointID
            LEFT JOIN Users u ON u.ID = o.UserID
            INNER JOIN OrderLineItems oli ON oli.OrderID = o.ID
            INNER JOIN Items i ON i.ID = oli.ItemID
            WHERE {$whereSQL}
              AND (i.StationID = ? OR i.StationID IS NULL)
              AND oli.IsDeleted = 0
            ORDER BY SubmittedOn ASC, o.ID ASC
        ", $stationParams);
    } else {
        $qOrders = queryTimed("
            SELECT
                o.ID, o.UUID, o.UserID, o.BusinessID, o.OrderTypeID, o.StatusID,
                o.ServicePointID, o.Remarks,
                DATE_FORMAT(o.SubmittedOn, '%Y-%m-%dT%H:%i:%sZ') AS SubmittedOn,
                DATE_FORMAT(o.LastEditedOn, '%Y-%m-%dT%H:%i:%sZ') AS LastEditedOn,
                sp.Name AS Name,
                u.FirstName, u.LastName
            FROM Orders o
            LEFT JOIN ServicePoints sp ON sp.ID = o.ServicePointID
            LEFT JOIN Users u ON u.ID = o.UserID
            WHERE {$whereSQL}
            ORDER BY o.SubmittedOn ASC, o.ID ASC
        ", $params);
    }

    $orders = [];
    foreach ($qOrders as $row) {
        // Get line items for this order
        $qLineItems = queryTimed("
            SELECT
                oli.ID, oli.ParentOrderLineItemID, oli.ItemID, oli.Price,
                oli.Quantity, oli.Remark, oli.IsDeleted, oli.StatusID,
                i.Name, i.ParentItemID, i.IsCheckedByDefault, i.StationID,
                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
        ", [(int) $row['ID']]);

        $lineItems = [];
        foreach ($qLineItems as $li) {
            $lineItems[] = [
                'OrderLineItemID'       => (int) $li['ID'],
                'ParentOrderLineItemID' => (int) $li['ParentOrderLineItemID'],
                'ItemID'                => (int) $li['ItemID'],
                'Price'                 => (float) $li['Price'],
                'Quantity'              => (int) $li['Quantity'],
                'Remark'                => $li['Remark'],
                'Name'                  => $li['Name'],
                'ParentItemID'          => (int) $li['ParentItemID'],
                'ItemParentName'        => $li['ItemParentName'],
                'IsCheckedByDefault'    => (int) $li['IsCheckedByDefault'],
                'StationID'             => (int) ($li['StationID'] ?? 0),
                'StatusID'              => (int) $li['StatusID'],
            ];
        }

        $orderTypeName = match ((int) $row['OrderTypeID']) {
            1 => 'Dine-In', 2 => 'Takeaway', 3 => 'Delivery', default => '',
        };

        $orders[] = [
            'OrderID'        => (int) $row['ID'],
            'UUID'           => $row['UUID'],
            'UserID'         => (int) $row['UserID'],
            'BusinessID'     => (int) $row['BusinessID'],
            'OrderTypeID'    => (int) $row['OrderTypeID'],
            'OrderTypeName'  => $orderTypeName,
            'StatusID'       => (int) $row['StatusID'],
            'ServicePointID' => (int) ($row['ServicePointID'] ?? 0),
            'Remarks'        => $row['Remarks'],
            'SubmittedOn'    => $row['SubmittedOn'],
            'LastEditedOn'   => $row['LastEditedOn'],
            'Name'           => $row['Name'],
            'FirstName'      => $row['FirstName'],
            'LastName'       => $row['LastName'],
            'LineItems'      => $lineItems,
        ];
    }

    jsonResponse(['OK' => true, 'ERROR' => '', 'ORDERS' => $orders, 'STATION_FILTER' => $StationID]);

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