<?php

use GuzzleHttp\Client;
use GuzzleHttp\Exception\ClientException;
use Phly\Http\ServerRequestFactory;
use Phly\Http\ServerRequest;
use Phly\Http\Response;

require __DIR__.'/vendor/autoload.php';

/**
 * Sends an HTTP response.
 *
 * @param Response $response
 */
function sendResponse(Response $response)
{
    http_response_code($response->getStatusCode());

    foreach ($response->getHeaders() as $header => $values) {
        if (strtolower($header) === 'content-type') {
            header(sprintf('%s: %s', $header, implode('; ', $values)));
        }
    }

    $body = $response->getBody();
    echo $body;

    return $body;
}

/**
 * Does a request to the API of Bittrex.
 *
 * @param ServerRequest $request
 * @param Client        $client
 *
 * @return \GuzzleHttp\Psr7\Response
 */
function doRequest(ServerRequest $request, Client $client, $host)
{
    $headers = [];

    foreach ($request->getHeaders() as $name => $value) {
        $headers[$name] = $value[0];
    }

    $serverParams = $request->getServerParams();
    $path = !empty($serverParams['PATH_INFO']) ? $serverParams['PATH_INFO'] : $serverParams['REQUEST_URI'];
    $url = $host.$path;

    unset($headers['host']);

    return $client->request(
        $request->getMethod(),
        $url,
        [
            'headers' => $headers,
            'body' => $request->getBody(),
        ]
    );
}

try {
    $apiResponse = doRequest(
        ServerRequestFactory::fromGlobals(),
        new Client(),
        getenv('PHP_PROXY_REMOTEHOST')
    );
} catch (ClientException $e) {
    $apiResponse = $e->getResponse();
}

return sendResponse(new Response(
    $apiResponse->getBody(),
    $apiResponse->getStatusCode(),
    $apiResponse->getHeaders()
));