<?php

namespace Drupal\Tests;

use GuzzleHttp\Client;
use GuzzleHttp\ClientInterface;
use GuzzleHttp\Cookie\CookieJar;
use GuzzleHttp\Exception\RequestException;
use Psr\Http\Message\ResponseInterface;
use Symfony\Component\BrowserKit\AbstractBrowser;
use Symfony\Component\BrowserKit\Response;

/**
 * Enables a BrowserKitDriver mink driver to use a Guzzle client.
 *
 * This code is heavily based on the following projects:
 * - https://github.com/FriendsOfPHP/Goutte
 * - https://github.com/minkphp/MinkGoutteDriver
 */
class DrupalTestBrowser extends AbstractBrowser {

  /**
   * The Guzzle client.
   *
   * @var \GuzzleHttp\ClientInterface
   */
  protected $client;

  /**
   * Sets the Guzzle client.
   *
   * @param \GuzzleHttp\ClientInterface $client
   *   The Guzzle client.
   *
   * @return $this
   */
  public function setClient(ClientInterface $client) {
    $this->client = $client;

    if ($this->getServerParameter('HTTP_HOST', NULL) !== NULL || $base_uri = $client->getConfig('base_uri') === NULL) {
      return $this;
    }

    $path = $base_uri->getPath();
    if ($path !== '' && $path !== '/') {
      throw new \InvalidArgumentException('Setting a path in the Guzzle "base_uri" config option is not supported by DrupalTestBrowser.');
    }

    if ($this->getServerParameter('HTTPS', NULL) === NULL && $base_uri->getScheme() === 'https') {
      $this->setServerParameter('HTTPS', 'on');
    }

    $host = $base_uri->getHost();
    if (($port = $base_uri->getPort()) !== NULL) {
      $host .= ":$port";
    }

    $this->setServerParameter('HTTP_HOST', $host);

    return $this;
  }

  /**
   * Gets the Guzzle client.
   *
   * @return \GuzzleHttp\ClientInterface
   *   The Guzzle client.
   */
  public function getClient() {
    if (!$this->client) {
      $this->client = new Client([
        'allow_redirects' => FALSE,
        'cookies' => TRUE,
      ]);
    }

    return $this->client;
  }

  /**
   * {@inheritdoc}
   */
  protected function doRequest($request): object {
    $headers = [];
    foreach ($request->getServer() as $key => $val) {
      $key = strtolower(str_replace('_', '-', $key));
      $content_headers = [
        'content-length' => TRUE,
        'content-md5' => TRUE,
        'content-type' => TRUE,
      ];
      if (strpos($key, 'http-') === 0) {
        $headers[substr($key, 5)] = $val;
      }
      // CONTENT_* are not prefixed with HTTP_
      elseif (isset($content_headers[$key])) {
        $headers[$key] = $val;
      }
    }

    $cookies = CookieJar::fromArray(
      $this->getCookieJar()->allRawValues($request->getUri()),
      parse_url($request->getUri(), PHP_URL_HOST)
    );

    $request_options = [
      'cookies' => $cookies,
      'allow_redirects' => FALSE,
    ];

    if (!\in_array($request->getMethod(), ['GET', 'HEAD'], TRUE)) {
      if (NULL !== $content = $request->getContent()) {
        $request_options['body'] = $content;
      }
      else {
        if ($files = $request->getFiles()) {
          $request_options['multipart'] = [];

          $this->addPostFields($request->getParameters(), $request_options['multipart']);
          $this->addPostFiles($files, $request_options['multipart']);
        }
        else {
          $request_options['form_params'] = $request->getParameters();
        }
      }
    }

    if (!empty($headers)) {
      $request_options['headers'] = $headers;
    }

    $method = $request->getMethod();
    $uri = $request->getUri();

    // Let BrowserKit handle redirects
    try {
      $response = $this->getClient()->request($method, $uri, $request_options);
    }
    // Catch RequestException rather than TransferException because we want
    // to re-throw the exception whenever the response is NULL, and
    // ConnectException always has a NULL response.
    catch (RequestException $e) {
      if (!$e->hasResponse()) {
        throw $e;
      }
      $response = $e->getResponse();
    }

    return $this->createResponse($response);
  }

  /**
   * Adds files to the $multipart array.
   *
   * @param array $files
   *   The files.
   * @param array $multipart
   *   A reference to the multipart array to add the files to.
   * @param string $array_name
   *   Internal parameter used by recursive calls.
   */
  protected function addPostFiles(array $files, array &$multipart, $array_name = '') {
    if (empty($files)) {
      return;
    }

    foreach ($files as $name => $info) {
      if (!empty($array_name)) {
        $name = $array_name . '[' . $name . ']';
      }

      $file = [
        'name' => $name,
      ];

      if (\is_array($info)) {
        if (isset($info['tmp_name'])) {
          if ($info['tmp_name'] !== '') {
            $file['contents'] = fopen($info['tmp_name'], 'r');
            if (isset($info['name'])) {
              $file['filename'] = $info['name'];
            }
          }
          else {
            continue;
          }
        }
        else {
          $this->addPostFiles($info, $multipart, $name);
          continue;
        }
      }
      else {
        $file['contents'] = fopen($info, 'r');
      }

      $multipart[] = $file;
    }
  }

  /**
   * Adds form parameters to the $multipart array.
   *
   * @param array $formParams
   *   The form parameters.
   * @param array $multipart
   *   A reference to the multipart array to add the form parameters to.
   * @param string $array_name
   *   Internal parameter used by recursive calls.
   */
  public function addPostFields(array $formParams, array &$multipart, $array_name = '') {
    foreach ($formParams as $name => $value) {
      if (!empty($array_name)) {
        $name = $array_name . '[' . $name . ']';
      }

      if (\is_array($value)) {
        $this->addPostFields($value, $multipart, $name);
      }
      else {
        $multipart[] = [
          'name' => $name,
          'contents' => $value,
        ];
      }
    }
  }

  /**
   * Converts a Guzzle response to a BrowserKit response.
   *
   * @param \Psr\Http\Message\ResponseInterface $response
   *   The Guzzle response.
   *
   * @return \Symfony\Component\BrowserKit\Response
   *   A BrowserKit Response instance.
   */
  protected function createResponse(ResponseInterface $response) {
    return new Response((string) $response->getBody(), $response->getStatusCode(), $response->getHeaders());
  }

}