<?php

namespace WPMailSMTP\Vendor\Aws;

use WPMailSMTP\Vendor\Aws\Exception\AwsException;
use WPMailSMTP\Vendor\Aws\Retry\RetryHelperTrait;
use WPMailSMTP\Vendor\GuzzleHttp\Exception\RequestException;
use WPMailSMTP\Vendor\Psr\Http\Message\RequestInterface;
use WPMailSMTP\Vendor\GuzzleHttp\Promise\PromiseInterface;
use WPMailSMTP\Vendor\GuzzleHttp\Promise;
/**
 * Middleware that retries failures. V1 implemention that supports 'legacy' mode.
 *
 * @internal
 */
class RetryMiddleware
{
    use RetryHelperTrait;
    private static $retryStatusCodes = [500 => \true, 502 => \true, 503 => \true, 504 => \true];
    private static $retryCodes = [
        // Throttling error
        'RequestLimitExceeded' => \true,
        'Throttling' => \true,
        'ThrottlingException' => \true,
        'ThrottledException' => \true,
        'ProvisionedThroughputExceededException' => \true,
        'RequestThrottled' => \true,
        'BandwidthLimitExceeded' => \true,
        'RequestThrottledException' => \true,
        'TooManyRequestsException' => \true,
        'IDPCommunicationError' => \true,
        'EC2ThrottledException' => \true,
    ];
    private $decider;
    private $delay;
    private $nextHandler;
    private $collectStats;
    public function __construct(callable $decider, callable $delay, callable $nextHandler, $collectStats = \false)
    {
        $this->decider = $decider;
        $this->delay = $delay;
        $this->nextHandler = $nextHandler;
        $this->collectStats = (bool) $collectStats;
    }
    /**
     * Creates a default AWS retry decider function.
     *
     * The optional $extraConfig parameter is an associative array
     * that specifies additional retry conditions on top of the ones specified
     * by default by the Aws\RetryMiddleware class, with the following keys:
     *
     * - errorCodes: (string[]) An indexed array of AWS exception codes to retry.
     *   Optional.
     * - statusCodes: (int[]) An indexed array of HTTP status codes to retry.
     *   Optional.
     * - curlErrors: (int[]) An indexed array of Curl error codes to retry. Note
     *   these should be valid Curl constants. Optional.
     *
     * @param int $maxRetries
     * @param array $extraConfig
     * @return callable
     */
    public static function createDefaultDecider($maxRetries = 3, $extraConfig = [])
    {
        $retryCurlErrors = [];
        if (\extension_loaded('curl')) {
            $retryCurlErrors[\CURLE_RECV_ERROR] = \true;
        }
        return function ($retries, \WPMailSMTP\Vendor\Aws\CommandInterface $command, \WPMailSMTP\Vendor\Psr\Http\Message\RequestInterface $request, \WPMailSMTP\Vendor\Aws\ResultInterface $result = null, $error = null) use($maxRetries, $retryCurlErrors, $extraConfig) {
            // Allow command-level options to override this value
            $maxRetries = null !== $command['@retries'] ? $command['@retries'] : $maxRetries;
            $isRetryable = self::isRetryable($result, $error, $retryCurlErrors, $extraConfig);
            if ($retries >= $maxRetries) {
                if (!empty($error) && $error instanceof \WPMailSMTP\Vendor\Aws\Exception\AwsException && $isRetryable) {
                    $error->setMaxRetriesExceeded();
                }
                return \false;
            }
            return $isRetryable;
        };
    }
    private static function isRetryable($result, $error, $retryCurlErrors, $extraConfig = [])
    {
        $errorCodes = self::$retryCodes;
        if (!empty($extraConfig['error_codes']) && \is_array($extraConfig['error_codes'])) {
            foreach ($extraConfig['error_codes'] as $code) {
                $errorCodes[$code] = \true;
            }
        }
        $statusCodes = self::$retryStatusCodes;
        if (!empty($extraConfig['status_codes']) && \is_array($extraConfig['status_codes'])) {
            foreach ($extraConfig['status_codes'] as $code) {
                $statusCodes[$code] = \true;
            }
        }
        if (!empty($extraConfig['curl_errors']) && \is_array($extraConfig['curl_errors'])) {
            foreach ($extraConfig['curl_errors'] as $code) {
                $retryCurlErrors[$code] = \true;
            }
        }
        if (!$error) {
            if (!isset($result['@metadata']['statusCode'])) {
                return \false;
            }
            return isset($statusCodes[$result['@metadata']['statusCode']]);
        }
        if (!$error instanceof \WPMailSMTP\Vendor\Aws\Exception\AwsException) {
            return \false;
        }
        if ($error->isConnectionError()) {
            return \true;
        }
        if (isset($errorCodes[$error->getAwsErrorCode()])) {
            return \true;
        }
        if (isset($statusCodes[$error->getStatusCode()])) {
            return \true;
        }
        if (\count($retryCurlErrors) && ($previous = $error->getPrevious()) && $previous instanceof \WPMailSMTP\Vendor\GuzzleHttp\Exception\RequestException) {
            if (\method_exists($previous, 'getHandlerContext')) {
                $context = $previous->getHandlerContext();
                return !empty($context['errno']) && isset($retryCurlErrors[$context['errno']]);
            }
            $message = $previous->getMessage();
            foreach (\array_keys($retryCurlErrors) as $curlError) {
                if (\strpos($message, 'cURL error ' . $curlError . ':') === 0) {
                    return \true;
                }
            }
        }
        return \false;
    }
    /**
     * Delay function that calculates an exponential delay.
     *
     * Exponential backoff with jitter, 100ms base, 20 sec ceiling
     *
     * @param $retries - The number of retries that have already been attempted
     *
     * @return int
     *
     * @link https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
     */
    public static function exponentialDelay($retries)
    {
        return \mt_rand(0, (int) \min(20000, (int) \pow(2, $retries) * 100));
    }
    /**
     * @param CommandInterface $command
     * @param RequestInterface $request
     *
     * @return PromiseInterface
     */
    public function __invoke(\WPMailSMTP\Vendor\Aws\CommandInterface $command, \WPMailSMTP\Vendor\Psr\Http\Message\RequestInterface $request = null)
    {
        $retries = 0;
        $requestStats = [];
        $monitoringEvents = [];
        $handler = $this->nextHandler;
        $decider = $this->decider;
        $delay = $this->delay;
        $request = $this->addRetryHeader($request, 0, 0);
        $g = function ($value) use($handler, $decider, $delay, $command, $request, &$retries, &$requestStats, &$monitoringEvents, &$g) {
            $this->updateHttpStats($value, $requestStats);
            if ($value instanceof \WPMailSMTP\Vendor\Aws\MonitoringEventsInterface) {
                $reversedEvents = \array_reverse($monitoringEvents);
                $monitoringEvents = \array_merge($monitoringEvents, $value->getMonitoringEvents());
                foreach ($reversedEvents as $event) {
                    $value->prependMonitoringEvent($event);
                }
            }
            if ($value instanceof \Exception || $value instanceof \Throwable) {
                if (!$decider($retries, $command, $request, null, $value)) {
                    return \WPMailSMTP\Vendor\GuzzleHttp\Promise\rejection_for($this->bindStatsToReturn($value, $requestStats));
                }
            } elseif ($value instanceof \WPMailSMTP\Vendor\Aws\ResultInterface && !$decider($retries, $command, $request, $value, null)) {
                return $this->bindStatsToReturn($value, $requestStats);
            }
            // Delay fn is called with 0, 1, ... so increment after the call.
            $delayBy = $delay($retries++);
            $command['@http']['delay'] = $delayBy;
            if ($this->collectStats) {
                $this->updateStats($retries, $delayBy, $requestStats);
            }
            // Update retry header with retry count and delayBy
            $request = $this->addRetryHeader($request, $retries, $delayBy);
            return $handler($command, $request)->then($g, $g);
        };
        return $handler($command, $request)->then($g, $g);
    }
}
