<?php

namespace App\BusProNet;

use App\BusProNet\Exception\ApiClientException;

trait ApiClientTrait
{
    /**
     * @throws ApiClientException
     */
    private function connect(string $host, int $port, int $maxRetries = 25)
    {
        $tries = 1;
        $errNo = $errStr = '';
        $errorCodesForRetry = [
            SOCKET_ECONNREFUSED,
            SOCKET_EBADF,
        ];

        $openSocket = function (&$errNo, &$errStr) use ($host, $port) {
            return @fsockopen(
                $host,
                $port,
                $errNo,
                $errStr,
                10
            );
        };

        $socket = $openSocket($errNo, $errStr);

        while (false === $socket && true === in_array($errNo, $errorCodesForRetry) && $maxRetries > $tries) {
            $this->logger->warning('Could not connect to socket, retrying', [
                'error_message' => $errStr,
                'error_number' => $errNo,
            ]);
            ++$tries;
            sleep(1);
            $socket = $openSocket($errNo, $errStr);
        }

        if (false !== $socket) {
            stream_set_timeout($socket, 60);
        } else {
            $this->logger->error('Unable to open socket', [
                'error_message' => $errStr,
                'error_number' => $errNo,
            ]);
            throw new ApiClientException('Unable to open socket');
        }

        return $socket;
    }

    private function send($socket, string $data): void
    {
        // message length is prepended to actual message
        $send = sprintf('%010s', strlen($data)) . $data;
        fwrite($socket, $send);
    }

    private function receive($socket): string
    {
        $response = '';

        while (false === feof($socket)) {
            $response .= fread($socket, 4096);
        }

        return $response;
    }

    private function disconnect($socket): void
    {
        @fclose($socket);
    }
}