<?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;

/**
 * @author Samuel Roze <samuel.roze@gmail.com>
 */
class TraceableMessageBus implements MessageBusInterface
{
    private $decoratedBus;
    private $dispatchedMessages = array();

    public function __construct(MessageBusInterface $decoratedBus)
    {
        $this->decoratedBus = $decoratedBus;
    }

    /**
     * {@inheritdoc}
     */
    public function dispatch($message)
    {
        $caller = $this->getCaller();
        $callTime = microtime(true);
        $messageToTrace = $message instanceof Envelope ? $message->getMessage() : $message;
        $envelopeItems = $message instanceof Envelope ? array_values($message->all()) : null;

        try {
            $result = $this->decoratedBus->dispatch($message);

            $this->dispatchedMessages[] = array(
                'envelopeItems' => $envelopeItems,
                'message' => $messageToTrace,
                'result' => $result,
                'callTime' => $callTime,
                'caller' => $caller,
            );

            return $result;
        } catch (\Throwable $e) {
            $this->dispatchedMessages[] = array(
                'envelopeItems' => $envelopeItems,
                'message' => $messageToTrace,
                'exception' => $e,
                'callTime' => $callTime,
                'caller' => $caller,
            );

            throw $e;
        }
    }

    public function getDispatchedMessages(): array
    {
        return $this->dispatchedMessages;
    }

    public function reset()
    {
        $this->dispatchedMessages = array();
    }

    private function getCaller(): array
    {
        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 8);

        $file = $trace[1]['file'];
        $line = $trace[1]['line'];

        for ($i = 2; $i < 8; ++$i) {
            if (isset($trace[$i]['class'], $trace[$i]['function'])
                && 'dispatch' === $trace[$i]['function']
                && is_a($trace[$i]['class'], MessageBusInterface::class, true)
            ) {
                $file = $trace[$i]['file'];
                $line = $trace[$i]['line'];

                while (++$i < 8) {
                    if (isset($trace[$i]['function'], $trace[$i]['file']) && empty($trace[$i]['class']) && 0 !== strpos(
                            $trace[$i]['function'],
                            'call_user_func'
                        )) {
                        $file = $trace[$i]['file'];
                        $line = $trace[$i]['line'];

                        break;
                    }
                }
                break;
            }
        }

        $name = str_replace('\\', '/', $file);
        $name = substr($name, strrpos($name, '/') + 1);

        return compact('name', 'file', 'line');
    }
}