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<?php

namespace React\Socket;

use React\Dns\Resolver\ResolverInterface;
use React\EventLoop\Loop;
use React\EventLoop\LoopInterface;
use React\Promise;

final class HappyEyeBallsConnector implements ConnectorInterface
{
    private $loop;
    private $connector;
    private $resolver;

    /**
     * @param ?LoopInterface $loop
     * @param ConnectorInterface $connector
     * @param ResolverInterface $resolver
     */
    public function __construct($loop = null, $connector = null, $resolver = null)
    {
        // $connector and $resolver arguments are actually required, marked
        // optional for technical reasons only. Nullable $loop without default
        // requires PHP 7.1, null default is also supported in legacy PHP
        // versions, but required parameters are not allowed after arguments
        // with null default. Mark all parameters optional and check accordingly.
        if ($loop !== null && !$loop instanceof LoopInterface) { // manual type check to support legacy PHP < 7.1
            throw new \InvalidArgumentException('Argument #1 ($loop) expected null|React\EventLoop\LoopInterface');
        }
        if (!$connector instanceof ConnectorInterface) { // manual type check to support legacy PHP < 7.1
            throw new \InvalidArgumentException('Argument #2 ($connector) expected React\Socket\ConnectorInterface');
        }
        if (!$resolver instanceof ResolverInterface) { // manual type check to support legacy PHP < 7.1
            throw new \InvalidArgumentException('Argument #3 ($resolver) expected React\Dns\Resolver\ResolverInterface');
        }

        $this->loop = $loop ?: Loop::get();
        $this->connector = $connector;
        $this->resolver = $resolver;
    }

    public function connect($uri)
    {
        $original = $uri;
        if (\strpos($uri, '://') === false) {
            $uri = 'tcp://' . $uri;
            $parts = \parse_url($uri);
            if (isset($parts['scheme'])) {
                unset($parts['scheme']);
            }
        } else {
            $parts = \parse_url($uri);
        }

        if (!$parts || !isset($parts['host'])) {
            return Promise\reject(new \InvalidArgumentException(
                'Given URI "' . $original . '" is invalid (EINVAL)',
                \defined('SOCKET_EINVAL') ? \SOCKET_EINVAL : (\defined('PCNTL_EINVAL') ? \PCNTL_EINVAL : 22)
            ));
        }

        $host = \trim($parts['host'], '[]');

        // skip DNS lookup / URI manipulation if this URI already contains an IP
        if (@\inet_pton($host) !== false) {
            return $this->connector->connect($original);
        }

        $builder = new HappyEyeBallsConnectionBuilder(
            $this->loop,
            $this->connector,
            $this->resolver,
            $uri,
            $host,
            $parts
        );
        return $builder->connect();
    }
}