<?php

namespace Beehive\GuzzleHttp\Ring\Client;

/**
 * Provides basic middleware wrappers.
 *
 * If a middleware is more complex than a few lines of code, then it should
 * be implemented in a class rather than a static method.
 */
class Middleware
{
    /**
     * Sends future requests to a future compatible handler while sending all
     * other requests to a default handler.
     *
     * When the "future" option is not provided on a request, any future responses
     * are automatically converted to synchronous responses and block.
     *
     * @param callable $default Handler used for non-streaming responses
     * @param callable $future  Handler used for future responses
     *
     * @return callable Returns the composed handler.
     */
    public static function wrapFuture(callable $default, callable $future)
    {
        return function (array $request) use($default, $future) {
            return empty($request['client']['future']) ? $default($request) : $future($request);
        };
    }
    /**
     * Sends streaming requests to a streaming compatible handler while sendin
     * all other requests to a default handler.
     *
     * This, for example, could be useful for taking advantage of the
     * performance benefits of curl while still supporting true streaming
     * through the StreamHandler.
     *
     * @param callable $default   Handler used for non-streaming responses
     * @param callable $streaming Handler used for streaming responses
     *
     * @return callable Returns the composed handler.
     */
    public static function wrapStreaming(callable $default, callable $streaming)
    {
        return function (array $request) use($default, $streaming) {
            return empty($request['client']['stream']) ? $default($request) : $streaming($request);
        };
    }
}