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

/**
 * Order History
 * GET: ?limit=20&offset=0
 * Returns completed/submitted orders for the authenticated user
 */

global $userId;

if ($userId <= 0) {
    apiAbort(['OK' => false, 'ERROR' => 'not_logged_in', 'MESSAGE' => 'Authentication required']);
}

$limit = (int) ($_GET['limit'] ?? 20);
$offset = (int) ($_GET['offset'] ?? 0);
if ($limit < 1) $limit = 20;
if ($limit > 100) $limit = 100;
if ($offset < 0) $offset = 0;

try {
    $qOrders = queryTimed("
        SELECT
            o.ID, o.UUID, o.BusinessID, o.StatusID, o.OrderTypeID,
            o.AddedOn, o.LastEditedOn,
            b.Name AS BusinessName,
            CASE o.OrderTypeID
                WHEN 0 THEN 'Undecided'
                WHEN 1 THEN 'Dine-In'
                WHEN 2 THEN 'Takeaway'
                WHEN 3 THEN 'Delivery'
                ELSE 'Unknown'
            END AS OrderTypeName
        FROM Orders o
        LEFT JOIN Businesses b ON b.ID = o.BusinessID
        WHERE o.UserID = ? AND o.StatusID > 0
        ORDER BY o.AddedOn DESC
        LIMIT ? OFFSET ?
    ", [$userId, $limit, $offset]);

    $qCount = queryOne("
        SELECT COUNT(*) AS TotalCount
        FROM Orders
        WHERE UserID = ? AND StatusID > 0
    ", [$userId]);

    $orders = [];
    foreach ($qOrders as $row) {
        $qItems = queryOne("
            SELECT COUNT(*) AS ItemCount, SUM(Quantity * Price) AS Subtotal
            FROM OrderLineItems
            WHERE OrderID = ? AND ParentOrderLineItemID = 0 AND (IsDeleted = 0 OR IsDeleted IS NULL)
        ", [(int) $row['ID']]);

        $itemCount = (int) ($qItems['ItemCount'] ?? 0);
        $subtotal = (float) ($qItems['Subtotal'] ?? 0);
        $tax = $subtotal * 0.0875;
        $total = $subtotal + $tax;

        $statusText = match ((int) $row['StatusID']) {
            1 => 'Submitted', 2 => 'In Progress', 3 => 'Ready',
            4 => 'Completed', 5 => 'Cancelled', default => 'Unknown',
        };

        $createdAt = '';
        if (!empty($row['AddedOn'])) {
            $createdAt = toISO8601($row['AddedOn']);
        }

        $completedAt = '';
        if ((int) $row['StatusID'] >= 4 && !empty($row['LastEditedOn'])) {
            $completedAt = toISO8601($row['LastEditedOn']);
        }

        $orders[] = [
            'OrderID'       => (int) $row['ID'],
            'OrderUUID'     => $row['UUID'] ?? '',
            'BusinessID'    => (int) $row['BusinessID'],
            'BusinessName'  => $row['BusinessName'] ?? 'Unknown',
            'OrderTotal'    => round($total * 100) / 100,
            'OrderStatusID' => (int) $row['StatusID'],
            'StatusName'    => $statusText,
            'OrderTypeID'   => (int) $row['OrderTypeID'],
            'TypeName'      => $row['OrderTypeName'] ?? 'Unknown',
            'ItemCount'     => $itemCount,
            'CreatedAt'     => $createdAt,
            'CompletedAt'   => $completedAt,
        ];
    }

    jsonResponse([
        'OK'          => true,
        'ORDERS'      => $orders,
        'TOTAL_COUNT' => (int) ($qCount['TotalCount'] ?? 0),
    ]);

} catch (Exception $e) {
    jsonResponse([
        'OK'      => false,
        'ERROR'   => 'server_error',
        'MESSAGE' => 'Failed to load order history',
        'DETAIL'  => $e->getMessage(),
    ]);
}