<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Messenger\Bridge\Redis\Transport;

use Symfony\Component\Messenger\Exception\InvalidArgumentException;
use Symfony\Component\Messenger\Exception\LogicException;
use Symfony\Component\Messenger\Exception\TransportException;

/**
 * A Redis connection.
 *
 * @author Alexander Schranz <alexander@sulu.io>
 * @author Antoine Bluchet <soyuka@gmail.com>
 * @author Robin Chalas <robin.chalas@gmail.com>
 *
 * @internal
 * @final
 */
class Connection
{
    private const DEFAULT_OPTIONS = [
        'stream' => 'messages',
        'group' => 'symfony',
        'consumer' => 'consumer',
        'auto_setup' => true,
        'delete_after_ack' => false,
        'stream_max_entries' => 0, // any value higher than 0 defines an approximate maximum number of stream entries
        'dbindex' => 0,
        'tls' => false,
        'redeliver_timeout' => 3600, // Timeout before redeliver messages still in pending state (seconds)
        'claim_interval' => 60000, // Interval by which pending/abandoned messages should be checked
    ];

    private $connection;
    private $stream;
    private $queue;
    private $group;
    private $consumer;
    private $autoSetup;
    private $maxEntries;
    private $redeliverTimeout;
    private $nextClaim = 0;
    private $claimInterval;
    private $deleteAfterAck;
    private $couldHavePendingMessages = true;

    public function __construct(array $configuration, array $connectionCredentials = [], array $redisOptions = [], \Redis $redis = null)
    {
        if (version_compare(phpversion('redis'), '4.3.0', '<')) {
            throw new LogicException('The redis transport requires php-redis 4.3.0 or higher.');
        }

        $this->connection = $redis ?: new \Redis();
        $this->connection->connect($connectionCredentials['host'] ?? '127.0.0.1', $connectionCredentials['port'] ?? 6379);
        $this->connection->setOption(\Redis::OPT_SERIALIZER, $redisOptions['serializer'] ?? \Redis::SERIALIZER_PHP);

        $auth = $connectionCredentials['auth'] ?? null;
        if ('' === $auth) {
            $auth = null;
        }

        if (null !== $auth && !$this->connection->auth($auth)) {
            throw new InvalidArgumentException('Redis connection failed: '.$this->connection->getLastError());
        }

        if (($dbIndex = $configuration['dbindex'] ?? self::DEFAULT_OPTIONS['dbindex']) && !$this->connection->select($dbIndex)) {
            throw new InvalidArgumentException('Redis connection failed: '.$this->connection->getLastError());
        }

        foreach (['stream', 'group', 'consumer'] as $key) {
            if (isset($configuration[$key]) && '' === $configuration[$key]) {
                throw new InvalidArgumentException(sprintf('"%s" should be configured, got an empty string.', $key));
            }
        }

        $this->stream = $configuration['stream'] ?? self::DEFAULT_OPTIONS['stream'];
        $this->group = $configuration['group'] ?? self::DEFAULT_OPTIONS['group'];
        $this->consumer = $configuration['consumer'] ?? self::DEFAULT_OPTIONS['consumer'];
        $this->queue = $this->stream.'__queue';
        $this->autoSetup = $configuration['auto_setup'] ?? self::DEFAULT_OPTIONS['auto_setup'];
        $this->maxEntries = $configuration['stream_max_entries'] ?? self::DEFAULT_OPTIONS['stream_max_entries'];
        $this->deleteAfterAck = $configuration['delete_after_ack'] ?? self::DEFAULT_OPTIONS['delete_after_ack'];
        $this->redeliverTimeout = ($configuration['redeliver_timeout'] ?? self::DEFAULT_OPTIONS['redeliver_timeout']) * 1000;
        $this->claimInterval = $configuration['claim_interval'] ?? self::DEFAULT_OPTIONS['claim_interval'];
    }

    public static function fromDsn(string $dsn, array $redisOptions = [], \Redis $redis = null): self
    {
        $url = $dsn;

        if (preg_match('#^redis:///([^:@])+$#', $dsn)) {
            $url = str_replace('redis:', 'file:', $dsn);
        }

        if (false === $parsedUrl = parse_url($url)) {
            throw new InvalidArgumentException(sprintf('The given Redis DSN "%s" is invalid.', $dsn));
        }
        if (isset($parsedUrl['query'])) {
            parse_str($parsedUrl['query'], $redisOptions);
        }

        self::validateOptions($redisOptions);

        $autoSetup = null;
        if (\array_key_exists('auto_setup', $redisOptions)) {
            $autoSetup = filter_var($redisOptions['auto_setup'], \FILTER_VALIDATE_BOOLEAN);
            unset($redisOptions['auto_setup']);
        }

        $maxEntries = null;
        if (\array_key_exists('stream_max_entries', $redisOptions)) {
            $maxEntries = filter_var($redisOptions['stream_max_entries'], \FILTER_VALIDATE_INT);
            unset($redisOptions['stream_max_entries']);
        }

        $deleteAfterAck = null;
        if (\array_key_exists('delete_after_ack', $redisOptions)) {
            $deleteAfterAck = filter_var($redisOptions['delete_after_ack'], \FILTER_VALIDATE_BOOLEAN);
            unset($redisOptions['delete_after_ack']);
        }

        $dbIndex = null;
        if (\array_key_exists('dbindex', $redisOptions)) {
            $dbIndex = filter_var($redisOptions['dbindex'], \FILTER_VALIDATE_INT);
            unset($redisOptions['dbindex']);
        }

        $tls = false;
        if (\array_key_exists('tls', $redisOptions)) {
            $tls = filter_var($redisOptions['tls'], \FILTER_VALIDATE_BOOLEAN);
            unset($redisOptions['tls']);
        }

        $redeliverTimeout = null;
        if (\array_key_exists('redeliver_timeout', $redisOptions)) {
            $redeliverTimeout = filter_var($redisOptions['redeliver_timeout'], \FILTER_VALIDATE_INT);
            unset($redisOptions['redeliver_timeout']);
        }

        $claimInterval = null;
        if (\array_key_exists('claim_interval', $redisOptions)) {
            $claimInterval = filter_var($redisOptions['claim_interval'], \FILTER_VALIDATE_INT);
            unset($redisOptions['claim_interval']);
        }

        $configuration = [
            'stream' => $redisOptions['stream'] ?? null,
            'group' => $redisOptions['group'] ?? null,
            'consumer' => $redisOptions['consumer'] ?? null,
            'auto_setup' => $autoSetup,
            'stream_max_entries' => $maxEntries,
            'delete_after_ack' => $deleteAfterAck,
            'dbindex' => $dbIndex,
            'redeliver_timeout' => $redeliverTimeout,
            'claim_interval' => $claimInterval,
        ];

        if (isset($parsedUrl['host'])) {
            $connectionCredentials = [
                'host' => $parsedUrl['host'] ?? '127.0.0.1',
                'port' => $parsedUrl['port'] ?? 6379,
                'auth' => $parsedUrl['pass'] ?? $parsedUrl['user'] ?? null,
            ];

            $pathParts = explode('/', rtrim($parsedUrl['path'] ?? '', '/'));

            $configuration['stream'] = $pathParts[1] ?? $configuration['stream'];
            $configuration['group'] = $pathParts[2] ?? $configuration['group'];
            $configuration['consumer'] = $pathParts[3] ?? $configuration['consumer'];
            if ($tls) {
                $connectionCredentials['host'] = 'tls://'.$connectionCredentials['host'];
            }
        } else {
            $connectionCredentials = [
                'host' => $parsedUrl['path'],
                'port' => 0,
            ];
        }

        return new self($configuration, $connectionCredentials, $redisOptions, $redis);
    }

    private static function validateOptions(array $options): void
    {
        $availableOptions = array_keys(self::DEFAULT_OPTIONS);
        $availableOptions[] = 'serializer';

        if (0 < \count($invalidOptions = array_diff(array_keys($options), $availableOptions))) {
            trigger_deprecation('symfony/messenger', '5.1', 'Invalid option(s) "%s" passed to the Redis Messenger transport. Passing invalid options is deprecated.', implode('", "', $invalidOptions));
        }
    }

    private function claimOldPendingMessages()
    {
        try {
            // This could soon be optimized with https://github.com/antirez/redis/issues/5212 or
            // https://github.com/antirez/redis/issues/6256
            $pendingMessages = $this->connection->xpending($this->stream, $this->group, '-', '+', 1);
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        $claimableIds = [];
        foreach ($pendingMessages as $pendingMessage) {
            if ($pendingMessage[1] === $this->consumer) {
                $this->couldHavePendingMessages = true;

                return;
            }

            if ($pendingMessage[2] >= $this->redeliverTimeout) {
                $claimableIds[] = $pendingMessage[0];
            }
        }

        if (\count($claimableIds) > 0) {
            try {
                $this->connection->xclaim(
                    $this->stream,
                    $this->group,
                    $this->consumer,
                    $this->redeliverTimeout,
                    $claimableIds,
                    ['JUSTID']
                );

                $this->couldHavePendingMessages = true;
            } catch (\RedisException $e) {
                throw new TransportException($e->getMessage(), 0, $e);
            }
        }

        $this->nextClaim = $this->getCurrentTimeInMilliseconds() + $this->claimInterval;
    }

    public function get(): ?array
    {
        if ($this->autoSetup) {
            $this->setup();
        }

        try {
            $queuedMessageCount = $this->connection->zcount($this->queue, 0, $this->getCurrentTimeInMilliseconds());
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        if ($queuedMessageCount) {
            for ($i = 0; $i < $queuedMessageCount; ++$i) {
                try {
                    $queuedMessages = $this->connection->zpopmin($this->queue, 1);
                } catch (\RedisException $e) {
                    throw new TransportException($e->getMessage(), 0, $e);
                }

                foreach ($queuedMessages as $queuedMessage => $time) {
                    $queuedMessage = json_decode($queuedMessage, true);
                    // if a futured placed message is actually popped because of a race condition with
                    // another running message consumer, the message is readded to the queue by add function
                    // else its just added stream and will be available for all stream consumers
                    $this->add(
                        $queuedMessage['body'],
                        $queuedMessage['headers'],
                        $time - $this->getCurrentTimeInMilliseconds()
                    );
                }
            }
        }

        if (!$this->couldHavePendingMessages && $this->nextClaim <= $this->getCurrentTimeInMilliseconds()) {
            $this->claimOldPendingMessages();
        }

        $messageId = '>'; // will receive new messages

        if ($this->couldHavePendingMessages) {
            $messageId = '0'; // will receive consumers pending messages
        }

        try {
            $messages = $this->connection->xreadgroup(
                $this->group,
                $this->consumer,
                [$this->stream => $messageId],
                1
            );
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        if (false === $messages) {
            if ($error = $this->connection->getLastError() ?: null) {
                $this->connection->clearLastError();
            }

            throw new TransportException($error ?? 'Could not read messages from the redis stream.');
        }

        if ($this->couldHavePendingMessages && empty($messages[$this->stream])) {
            $this->couldHavePendingMessages = false;

            // No pending messages so get a new one
            return $this->get();
        }

        foreach ($messages[$this->stream] ?? [] as $key => $message) {
            $redisEnvelope = json_decode($message['message'], true);

            return [
                'id' => $key,
                'body' => $redisEnvelope['body'],
                'headers' => $redisEnvelope['headers'],
            ];
        }

        return null;
    }

    public function ack(string $id): void
    {
        try {
            $acknowledged = $this->connection->xack($this->stream, $this->group, [$id]);
            if ($this->deleteAfterAck) {
                $acknowledged = $this->connection->xdel($this->stream, [$id]);
            }
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        if (!$acknowledged) {
            if ($error = $this->connection->getLastError() ?: null) {
                $this->connection->clearLastError();
            }
            throw new TransportException($error ?? sprintf('Could not acknowledge redis message "%s".', $id));
        }
    }

    public function reject(string $id): void
    {
        try {
            $deleted = $this->connection->xack($this->stream, $this->group, [$id]);
            $deleted = $this->connection->xdel($this->stream, [$id]) && $deleted;
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        if (!$deleted) {
            if ($error = $this->connection->getLastError() ?: null) {
                $this->connection->clearLastError();
            }
            throw new TransportException($error ?? sprintf('Could not delete message "%s" from the redis stream.', $id));
        }
    }

    public function add(string $body, array $headers, int $delayInMs = 0): void
    {
        if ($this->autoSetup) {
            $this->setup();
        }

        try {
            if ($delayInMs > 0) { // the delay could be smaller 0 in a queued message
                $message = json_encode([
                    'body' => $body,
                    'headers' => $headers,
                    // Entry need to be unique in the sorted set else it would only be added once to the delayed messages queue
                    'uniqid' => uniqid('', true),
                ]);

                if (false === $message) {
                    throw new TransportException(json_last_error_msg());
                }

                $score = (int) ($this->getCurrentTimeInMilliseconds() + $delayInMs);
                $added = $this->connection->zadd($this->queue, ['NX'], $score, $message);
            } else {
                $message = json_encode([
                    'body' => $body,
                    'headers' => $headers,
                ]);

                if (false === $message) {
                    throw new TransportException(json_last_error_msg());
                }

                if ($this->maxEntries) {
                    $added = $this->connection->xadd($this->stream, '*', ['message' => $message], $this->maxEntries, true);
                } else {
                    $added = $this->connection->xadd($this->stream, '*', ['message' => $message]);
                }
            }
        } catch (\RedisException $e) {
            if ($error = $this->connection->getLastError() ?: null) {
                $this->connection->clearLastError();
            }
            throw new TransportException($error ?? $e->getMessage(), 0, $e);
        }

        if (!$added) {
            if ($error = $this->connection->getLastError() ?: null) {
                $this->connection->clearLastError();
            }
            throw new TransportException($error ?? 'Could not add a message to the redis stream.');
        }
    }

    public function setup(): void
    {
        try {
            $this->connection->xgroup('CREATE', $this->stream, $this->group, 0, true);
        } catch (\RedisException $e) {
            throw new TransportException($e->getMessage(), 0, $e);
        }

        // group might already exist, ignore
        if ($this->connection->getLastError()) {
            $this->connection->clearLastError();
        }

        if ($this->deleteAfterAck) {
            $groups = $this->connection->xinfo('GROUPS', $this->stream);
            if (
                // support for Redis extension version 5+
                (\is_array($groups) && 1 < \count($groups))
                // support for Redis extension version 4.x
                || (\is_string($groups) && substr_count($groups, '"name"'))
            ) {
                throw new LogicException(sprintf('More than one group exists for stream "%s", delete_after_ack can not be enabled as it risks deleting messages before all groups could consume them.', $this->stream));
            }
        }

        $this->autoSetup = false;
    }

    private function getCurrentTimeInMilliseconds(): int
    {
        return (int) (microtime(true) * 1000);
    }

    public function cleanup(): void
    {
        $this->connection->del($this->stream);
        $this->connection->del($this->queue);
    }
}
class_alias(Connection::class, \Symfony\Component\Messenger\Transport\RedisExt\Connection::class);
