<?php

namespace Bastion\ScheduledTasks;

use GuzzleHttp\Exception\GuzzleException;
use Acme\ECommerceFramework\Cache\CacheInterface;
use Acme\ECommerceFramework\Config\Settings;
use Acme\ECommerceFramework\Scheduler\TaskInterface;
use Acme\ECommerceFramework\AcmeShopPulse\AcmeShopEvent;
use Acme\ECommerceFramework\AcmeShopPulse\AcmeShopPulseEventsSender;
use Psr\Log\LoggerInterface;
use Throwable;

class AcmeShopPulseSendEventsTask implements TaskInterface
{
    private AcmeShopEvent $eventModel;
    private AcmeShopPulseEventsSender $eventsSender;
    private LoggerInterface $logger;
    private CacheInterface $cache;
    private Settings $settings;
    private int $maxAttempts;
    private int $batchSize;

    public function __construct(
        Settings $settings,
        AcmeShopEvent $eventModel,
        AcmeShopPulseEventsSender $eventsSender,
        LoggerInterface $logger,
        CacheInterface $cache
    ) {
        $this->settings = $settings;
        $this->eventModel = $eventModel;
        $this->eventsSender = $eventsSender;
        $this->logger = $logger;
        $this->cache = $cache;

        // Получаем конфигурацию из настроек пользователя
        $this->maxAttempts = (int) $this->settings->get('pulse.max_attempts', env('PULSE_MAX_ATTEMPTS', 3));
        $this->batchSize = (int) $this->settings->get('pulse.batch_size', env('PULSE_BATCH_SIZE', 50));
    }

    public function execute(): void
    {
        try {
            // Получаем события со статусом pending
            $events = $this->eventModel->findPending($this->batchSize);

            if (empty($events)) {
                $this->logger->debug('No pending events to send');
                return;
            }

            $count = count($events);
            $this->logger->info("Processing pending events: $count", [
                'count' => $count,
            ]);

            $processed = 0;
            $succeeded = 0;
            $failed = 0;

            foreach ($events as $event) {
                try {
                    $result = $this->processEvent($event);
                    $result ? $succeeded++ : $failed++;
                } catch (Throwable $e) {
                    $this->logger->error("Failed to process event {$event['id']}: " . $e->getMessage(), [
                        'event_id' => $event['id'],
                        'event' => $event['event'] ?? null,
                        'payload' => $event['payload'] ?? null,
                        'exception' => $e,
                    ]);
                    $failed++;
                } finally {
                    $processed++;
                }
            }

            $this->logger->info("Events processing completed", [
                'processed' => $processed,
                'succeeded' => $succeeded,
                'failed' => $failed,
            ]);
        } catch (Throwable $e) {
            $this->logger->error("AcmeShopPulseSendEventsTask failed: " . $e->getMessage(), [
                'exception' => $e,
            ]);
        } finally {
            // Сбрасываем кеш статистики после каждого прогона
            $this->clearStatsCache();
        }
    }

    /**
     * Обработать одно событие
     *
     * @param array $event Данные события из БД
     * @return bool true если событие успешно отправлено, false если требуется повторная попытка
     * @throws Throwable
     */
    private function processEvent(array $event): bool
    {
        $eventId = (int) $event['id'];
        $attemptsCount = (int) $event['attempts_count'];

        try {
            // Пытаемся отправить событие
            $success = $this->eventsSender->sendEvent($event);

            if ($success) {
                // Успешная отправка
                $this->eventModel->updateStatus($eventId, 'sent');
                $this->logger->debug("Event {$eventId} sent successfully", [
                    'event_id' => $eventId,
                    'event' => $event['event'],
                ]);
                return true;
            }

            // AcmeShop Pulse не вернул подтверждение
            $errorReason = 'No confirmation received from AcmeShop Pulse';
            $this->handleFailedAttempt($eventId, $attemptsCount, $errorReason);
        } catch (GuzzleException $e) {
            // Ошибка HTTP запроса
            $errorReason = 'HTTP error: ' . $e->getMessage();
            $this->handleFailedAttempt($eventId, $attemptsCount, $errorReason);
        } catch (Throwable $e) {
            // Другие ошибки (валидация, подпись и т.д.)
            $errorReason = 'Error: ' . $e->getMessage();
            $this->handleFailedAttempt($eventId, $attemptsCount, $errorReason);
        }

        return false;
    }

    /**
     * Обработать неудачную попытку отправки
     *
     * @param int $eventId ID события
     * @param int $currentAttempts Текущее количество попыток
     * @param string $errorReason Причина ошибки
     */
    private function handleFailedAttempt(int $eventId, int $currentAttempts, string $errorReason): void
    {
        $newAttempts = $currentAttempts + 1;

        if ($newAttempts >= $this->maxAttempts) {
            // Превышен лимит попыток - переводим в failed
            $this->eventModel->updateStatus($eventId, 'failed', $errorReason);
            $this->logger->warning("Event {$eventId} marked as failed after {$newAttempts} attempts", [
                'event_id' => $eventId,
                'attempts' => $newAttempts,
                'error' => $errorReason,
            ]);
            return;
        }

        // Увеличиваем счетчик попыток, оставляем статус pending
        $this->eventModel->incrementAttempts($eventId);
        $this->logger->debug("Event {$eventId} attempt failed, will retry", [
            'event_id' => $eventId,
            'attempts' => $newAttempts,
            'max_attempts' => $this->maxAttempts,
            'error' => $errorReason,
        ]);
    }

    /**
     * Сбросить кеш статистики
     */
    private function clearStatsCache(): void
    {
        $this->cache->delete('acmeshop_pulse_stats');
    }
}