<?php
// food/courier/offer_respond.php — قبول/رفض عرض توصيل
// body: order_id, response ('accept'|'reject')
require_once __DIR__ . '/../connect_courier.php';

$orderId  = filterRequest('order_id', 'int');
$response = filterRequest('response');
if (!$orderId || !in_array($response, ['accept', 'reject'], true)) {
    jsonError('order_id and response (accept|reject) are required');
}

$assignSt = $food_con->prepare(
    "SELECT id FROM food_courier_assignments WHERE order_id=? AND courier_id=? AND status='offered'
     ORDER BY offered_at DESC LIMIT 1"
);
$assignSt->execute([$orderId, $food_courier_id]);
$assignment = $assignSt->fetch();
if (!$assignment) jsonError('No pending offer for this order', 404);

if ($response === 'reject') {
    $food_con->prepare("UPDATE food_courier_assignments SET status='rejected', responded_at=NOW() WHERE id=?")
        ->execute([$assignment['id']]);

    // أعد المحاولة على مرشّح آخر — يعيد استخدام نفس منطق ready.php
    $orderSt = $food_con->prepare("SELECT merchant_id FROM food_orders WHERE id=? AND status='ready'");
    $orderSt->execute([$orderId]);
    if ($order = $orderSt->fetch()) {
        $merchantSt = $food_con->prepare("SELECT latitude, longitude FROM food_merchants WHERE id=?");
        $merchantSt->execute([$order['merchant_id']]);
        if ($merchant = $merchantSt->fetch()) {
            $candidates = foodFindNearbyCouriers((float)$merchant['latitude'], (float)$merchant['longitude']);
            $priorSt = $food_con->prepare("SELECT courier_id FROM food_courier_assignments WHERE order_id=?");
            $priorSt->execute([$orderId]);
            $prior = array_column($priorSt->fetchAll(), 'courier_id');
            foreach ($candidates as $candidateId) {
                if (in_array($candidateId, $prior, true)) continue;
                foodOfferOrderToCourier($orderId, $candidateId);
                break;
            }
        }
    }

    jsonSuccess(['order_id' => $orderId, 'response' => 'rejected']);
}

// accept — القفل الذرّي يمنع سباق القبول لو انتهت مهلة سابقة وعُرض على اثنين معاً
if (!foodLockOrderForCourier($orderId, $food_courier_id)) {
    $owner = foodOrderLockOwner($orderId);
    if ($owner !== $food_courier_id) {
        jsonError('Order was already claimed by another courier', 409);
    }
}

// الطلب لم يُسند لأي سائق بعد عند هذه النقطة — لا فحص ملكية هنا، فقط فحص الحالة أدناه
$orderSt = $food_con->prepare("SELECT status FROM food_orders WHERE id=? LIMIT 1");
$orderSt->execute([$orderId]);
$orderRow = $orderSt->fetch();
if (!$orderRow || $orderRow['status'] !== 'ready') {
    jsonError('Order is no longer available for assignment', 409);
}

$food_con->beginTransaction();
try {
    $food_con->prepare("UPDATE food_orders SET courier_id=? WHERE id=?")->execute([$food_courier_id, $orderId]);
    $food_con->prepare("UPDATE food_courier_assignments SET status='accepted', responded_at=NOW() WHERE id=?")
        ->execute([$assignment['id']]);
    $food_con->commit();
} catch (Throwable $e) {
    $food_con->rollBack();
    appLog('[FOOD][COURIER][offer_respond] ' . $e->getMessage(), 'ERROR');
    jsonError('Failed to accept offer', 500);
}

food_transition_status($orderId, 'courier_assigned', 'courier', $food_courier_id);

jsonSuccess(['order_id' => $orderId, 'response' => 'accepted']);