<?php

namespace app\common\mq;

class ReferenceCheckMqPublisher
{
  public function publishArticleStart($pArticleId, $batchId, $trigger = 'enqueue')
  {
    if (!class_exists('\\PhpAmqpLib\\Connection\\AMQPStreamConnection')) {
      throw new \RuntimeException('php-amqplib not installed. Run: php composer.phar require php-amqplib/php-amqplib:^2.12');
    }

    $pArticleId = intval($pArticleId);
    $batchId = intval($batchId);
    if ($pArticleId <= 0 || $batchId <= 0) {
      throw new \InvalidArgumentException('invalid p_article_id or batch_id');
    }

    $body = json_encode([
      'p_article_id' => $pArticleId,
      'batch_id'     => $batchId,
      'trigger'      => (string)$trigger,
      'ts'           => time(),
    ], JSON_UNESCAPED_UNICODE);

    $rc = RabbitMqConfig::referenceCheck();
    $exchange = isset($rc['exchange']) ? $rc['exchange'] : 'reference_check';
    $routeKey = isset($rc['route_key']) ? $rc['route_key'] : 'article.start';

    $conn = $this->connect();
    try {
      $ch = $conn->channel();
      $this->declareTopology($ch, $rc);
      $msg = new \PhpAmqpLib\Message\AMQPMessage($body, [
        'content_type'  => 'application/json',
        'delivery_mode' => \PhpAmqpLib\Message\AMQPMessage::DELIVERY_MODE_PERSISTENT,
      ]);
      $ch->basic_publish($msg, $exchange, $routeKey);
      $ch->close();
    } finally {
      $conn->close();
    }

    return true;
  }

  private function connect()
  {
    return new \PhpAmqpLib\Connection\AMQPStreamConnection(
      RabbitMqConfig::get('host', '127.0.0.1'),
      intval(RabbitMqConfig::get('port', 5672)),
      RabbitMqConfig::get('user', 'guest'),
      RabbitMqConfig::get('password', 'guest'),
      RabbitMqConfig::get('vhost', '/')
    );
  }

  private function declareTopology($ch, array $rc)
  {
    $exchange = isset($rc['exchange']) ? $rc['exchange'] : 'reference_check';
    $queue = isset($rc['queue']) ? $rc['queue'] : 'ref_check.article';
    $dlq = isset($rc['dlq']) ? $rc['dlq'] : 'ref_check.article.dlq';
    $routeKey = isset($rc['route_key']) ? $rc['route_key'] : 'article.start';

    $ch->exchange_declare($exchange, 'direct', false, true, false);
    $ch->queue_declare($dlq, false, true, false, false);
    $ch->queue_declare($queue, false, true, false, false, false, new \PhpAmqpLib\Wire\AMQPTable([
      'x-dead-letter-exchange'    => '',
      'x-dead-letter-routing-key' => $dlq,
    ]));
    $ch->queue_bind($queue, $exchange, $routeKey);
  }
}