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<?php

namespace SAREhub\Commons\Zmq\RequestReply;

use SAREhub\Commons\Misc\Dsn;

/**
 * Receiving request from ZMQ and sending reply for that.
 */
class RequestReceiver
{

    const WAIT = true;
    const DONT_WAIT = false;

    /**
     * @var Dsn
     */
    protected $dsn = null;

    /**
     * @var \ZMQContext
     */
    protected $context;

    /**
     * @var \ZMQSocket
     */
    protected $socket = null;

    /**
     * @param \ZMQContext $context
     */
    public function __construct(\ZMQContext $context)
    {
        $this->context = $context;
    }

    /**
     * @param \ZMQContext $context
     * @return RequestReceiver
     */
    public static function inContext(\ZMQContext $context)
    {
        return new self($context);
    }

    /**
     * Binds socket to $dsn
     * @param Dsn $dsn
     * @return $this
     * @throws \LogicException When binding second time.
     */
    public function bind(Dsn $dsn)
    {
        if ($this->isBinded()) {
            throw new \LogicException("Can't bind to binded socket");
        }
        $this->dsn = $dsn;
        $this->getSocket()->bind((string)$dsn);
        return $this;
    }

    /**
     * Unbinds socket from current binded dsn
     * @return $this
     */
    public function unbind()
    {
        if ($this->isBinded()) {
            $this->getSocket()->unbind($this->dsn);
            $this->dsn = null;
        }

        return $this;
    }

    /**
     * Getting next request from socket.
     * @param bool $wait If true call will waits for next request.
     * @return string
     * @throws \ZMQSocketException
     */
    public function receiveRequest($wait = self::WAIT)
    {
        return $this->getSocket()->recv(($wait ? 0 : \ZMQ::MODE_DONTWAIT));
    }

    /**
     * Sending reply to ZMQ socket.
     * @param string $reply
     * @param bool $wait If true call will be waits for reply send done.
     * @return $this
     * @throws \ZMQSocketException
     */
    public function sendReply($reply, $wait = self::WAIT)
    {
        $this->getSocket()->send($reply, ($wait ? 0 : \ZMQ::MODE_DONTWAIT));
        return $this;
    }

    /**
     * @return bool
     */
    public function isBinded()
    {
        return $this->getDsn() !== null;
    }

    /**
     * @return Dsn Current binded dsn
     */
    public function getDsn()
    {
        return $this->dsn;
    }

    /**
     * @return \ZMQSocket
     */
    public function getSocket()
    {
        if ($this->socket === null) {
            $this->socket = $this->context->getSocket(\ZMQ::SOCKET_REP, null, null);
        }

        return $this->socket;
    }

    /**
     * @return \ZMQContext
     */
    public function getContext()
    {
        return $this->context;
    }

}