<?php

declare(strict_types=1);

namespace App\Service;

use App\Model\PurchaseFlow;
use Symfony\Component\HttpFoundation\Request;

/**
 * Tells the login page which purchase flow, if any, it is the entry to.
 *
 * Both a booking and a voucher purchase can be pending in the same session, e.g. when they were
 * started in two tabs. The one started last wins, which is what the visitor just clicked.
 */
class PurchaseFlowResolver
{
    public const string LAST_STARTED_KEY = 'purchase_flow_last_started';

    public function markStarted(Request $request, PurchaseFlow $flow): void
    {
        $request->getSession()->set(self::LAST_STARTED_KEY, $flow->value);
    }

    public function resolvePending(Request $request): ?PurchaseFlow
    {
        $session = $request->getSession();
        $hasBooking = $session->has(BookingSessionManager::BOOKING_CREATE_KEY);
        $hasVoucher = $session->has(VoucherPurchaseSessionManager::SESSION_KEY);

        if (true === $hasBooking && true === $hasVoucher) {
            return PurchaseFlow::tryFrom((string) $session->get(self::LAST_STARTED_KEY)) ?? PurchaseFlow::Booking;
        }

        return match (true) {
            $hasBooking => PurchaseFlow::Booking,
            $hasVoucher => PurchaseFlow::Voucher,
            default => null,
        };
    }
}