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

/**
 * Get Order Detail
 * GET: ?OrderID=123
 * POST: { OrderID: 123 }
 */

function getStatusText(int $status): string {
    return match ($status) {
        0 => 'Cart', 1 => 'Submitted', 2 => 'In Progress', 3 => 'Ready',
        4 => 'On the Way', 5 => 'Complete', 6 => 'Cancelled', 7 => 'Deleted',
        default => 'Unknown',
    };
}

function getOrderTypeName(int $orderType): string {
    return match ($orderType) {
        1 => 'Dine-in', 2 => 'Takeaway', 3 => 'Delivery', default => 'Unknown',
    };
}

$response = ['OK' => false];

try {
    // Get OrderID from GET or POST
    $orderID = (int) ($_GET['OrderID'] ?? 0);
    if ($orderID === 0) {
        $data = readJsonBody();
        $orderID = (int) ($data['OrderID'] ?? 0);
    }

    if ($orderID === 0) {
        $response['ERROR'] = 'missing_order_id';
        $response['MESSAGE'] = 'OrderID is required';
        jsonResponse($response);
    }

    $qOrder = queryOne("
        SELECT
            o.ID, o.UUID, o.BusinessID, o.UserID, o.ServicePointID,
            o.StatusID, o.OrderTypeID, o.Remarks, o.AddedOn, o.LastEditedOn,
            o.SubmittedOn, o.TipAmount, o.PlatformFee,
            u.FirstName, u.LastName, u.ContactNumber, u.EmailAddress,
            sp.Name AS Name, sp.TypeID AS TypeID,
            b.Name AS BizName, b.TaxRate
        FROM Orders o
        LEFT JOIN Users u ON u.ID = o.UserID
        LEFT JOIN ServicePoints sp ON sp.ID = o.ServicePointID
        LEFT JOIN Businesses b ON b.ID = o.BusinessID
        WHERE o.ID = ?
    ", [$orderID]);

    if (!$qOrder) {
        $response['ERROR'] = 'order_not_found';
        $response['MESSAGE'] = 'Order not found';
        jsonResponse($response);
    }

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

    // Build hierarchy
    $itemsById = [];
    foreach ($qItems as $row) {
        $itemsById[(int) $row['ID']] = [
            'LineItemID'     => (int) $row['ID'],
            'ItemID'         => (int) $row['ItemID'],
            'ParentLineItemID' => (int) $row['ParentOrderLineItemID'],
            'Name'           => $row['Name'] ?? '',
            'Quantity'       => (int) $row['Quantity'],
            'UnitPrice'      => (float) $row['Price'],
            'Remarks'        => $row['Remark'] ?? '',
            'IsDefault'      => ((int) $row['IsCheckedByDefault'] === 1),
            'Modifiers'      => [],
        ];
    }

    $lineItems = [];
    foreach ($qItems as $row) {
        $id = (int) $row['ID'];
        $parentID = (int) $row['ParentOrderLineItemID'];
        if ($parentID > 0 && isset($itemsById[$parentID])) {
            $itemsById[$parentID]['Modifiers'][] = &$itemsById[$id];
        } else {
            $lineItems[] = &$itemsById[$id];
        }
    }
    unset($id); // break reference

    // Calculate subtotal
    $subtotal = 0;
    foreach ($lineItems as $item) {
        $itemTotal = $item['UnitPrice'] * $item['Quantity'];
        foreach ($item['Modifiers'] as $mod) {
            $itemTotal += $mod['UnitPrice'] * $mod['Quantity'];
        }
        $subtotal += $itemTotal;
    }

    $taxRate = (is_numeric($qOrder['TaxRate']) && (float) $qOrder['TaxRate'] > 0) ? (float) $qOrder['TaxRate'] : 0;
    $tax = $subtotal * $taxRate;
    $tip = is_numeric($qOrder['TipAmount']) ? (float) $qOrder['TipAmount'] : 0;
    $platformFee = is_numeric($qOrder['PlatformFee']) ? (float) $qOrder['PlatformFee'] : 0;
    $total = $subtotal + $tax + $tip + $platformFee;

    // Get staff who worked on this order
    $qStaff = queryTimed("
        SELECT DISTINCT u.ID, u.FirstName,
               (SELECT r.AccessToken
                FROM TaskRatings r
                INNER JOIN Tasks t2 ON t2.ID = r.TaskID
                WHERE t2.OrderID = ?
                  AND r.ForUserID = u.ID
                  AND r.Direction = 'customer_rates_worker'
                  AND r.CompletedOn IS NULL
                  AND r.ExpiresOn > NOW()
                LIMIT 1) AS RatingToken
        FROM Tasks t
        INNER JOIN Users u ON u.ID = t.ClaimedByUserID
        WHERE t.OrderID = ? AND t.ClaimedByUserID > 0
    ", [$orderID, $orderID]);

    $staff = [];
    foreach ($qStaff as $row) {
        $staff[] = [
            'UserID'      => (int) $row['ID'],
            'FirstName'   => $row['FirstName'],
            'AvatarUrl'   => baseUrl() . '/uploads/users/' . $row['ID'] . '.jpg',
            'RatingToken' => $row['RatingToken'] ?? '',
        ];
    }

    $statusID = (int) $qOrder['StatusID'];
    $orderTypeID = (int) ($qOrder['OrderTypeID'] ?? 0);

    $response['OK'] = true;
    $response['ORDER'] = [
        'OrderID'       => (int) $qOrder['ID'],
        'UUID'          => $qOrder['UUID'] ?? '',
        'BusinessID'    => (int) $qOrder['BusinessID'],
        'Name'          => $qOrder['BizName'] ?? '',
        'Status'        => $statusID,
        'StatusText'    => getStatusText($statusID),
        'OrderTypeID'   => $orderTypeID,
        'OrderTypeName' => getOrderTypeName($orderTypeID),
        'Subtotal'      => $subtotal,
        'Tax'           => $tax,
        'Tip'           => $tip,
        'PlatformFee'   => $platformFee,
        'Total'         => $total,
        'Notes'         => $qOrder['Remarks'],
        'CreatedOn'     => toISO8601($qOrder['AddedOn']),
        'SubmittedOn'   => !empty($qOrder['SubmittedOn']) ? toISO8601($qOrder['SubmittedOn']) : '',
        'UpdatedOn'     => !empty($qOrder['LastEditedOn']) ? toISO8601($qOrder['LastEditedOn']) : '',
        'Customer'      => [
            'UserID'    => (int) $qOrder['UserID'],
            'FirstName' => $qOrder['FirstName'],
            'LastName'  => $qOrder['LastName'],
            'Phone'     => $qOrder['ContactNumber'],
            'Email'     => $qOrder['EmailAddress'],
        ],
        'ServicePoint'  => [
            'ServicePointID' => (int) ($qOrder['ServicePointID'] ?? 0),
            'Name'           => $qOrder['Name'] ?? '',
            'TypeID'         => (int) ($qOrder['TypeID'] ?? 0),
        ],
        'LineItems'     => $lineItems,
        'Staff'         => $staff,
    ];

} catch (Exception $e) {
    $response['ERROR'] = 'server_error';
    $response['MESSAGE'] = $e->getMessage();
}

jsonResponse($response);