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<?php

/**
 * Service.php.
 *
 * @author Michael Pratt <pratt@hablarmierda.net>
 *
 * @link   http://www.michael-pratt.com/
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Embera\Adapters;

/**
 * This is an abstract class and all Service/Providers should extend it.
 */
abstract class Service
{
    /**
     * @var mixed Instance of \Embera\Url
     *            (Marking this as mixed instead of object because scrutinizer complains about type check on preg_match)
     */
    protected $url;

/** @var object Instance of \Embera\Oembed */
    protected $oembed = null;

/** @var array Associative array with config/parameters to be sent to the oembed provider */
    protected $config = array();

/** @var array Array with all the errors */
    protected $errors = array();

/** @var string The api url for the current service */
    protected $apiUrl = null;

/**
     * Validates that the url belongs to this service.
     * Should be implemented on all children and should
     * return a boolean (preg_match returns 0 or 1 that
     * is why I'm also allowing 'int' as a return type).
     *
     * The current url is made available via $this->url
     *
     * @return bool|int
     */
    abstract protected function validateUrl();

/**
     * Construct.
     *
     * @param string $url
     * @param array  $config
     * @param object $oembed
     *
     * @throws InvalidArgumentException when the given url doesnt match the current service
     */
    public function __construct($url, array $config = array(), \Embera\Oembed $oembed)
    {
        $this->url = new \Embera\Url($url);
        $this->normalizeUrl();

if (!$this->validateUrl()) {
            throw new \InvalidArgumentException('Url '.$this->url.' seems to be invalid for the '.get_class($this).' service');
        }

$this->config = array_replace_recursive(array(
            'params' => array(
                'maxwidth' => 0,
                'maxheight' => 0,
            ),
        ), $config);

$this->oembed = $oembed;
    }

/**
     * Gets the information from an Oembed provider
     * when this fails, it tries to provide a fakeResponse.
     * Returns an associative array with a (common) Oembed response.
     *
     * @return array
     */
    public function getInfo()
    {
        try {
            if ($res = $this->oembed->getResourceInfo($this->config['oembed'], $this->apiUrl, (string) $this->url, $this->config['params'])) {
                return $this->modifyResponse($res);
            }
        } catch (\Exception $e) {
            $this->errors[] = $e->getMessage();
        }

/*
         * Use fakeResponses when the oembed setting is null or false
         * If the oembed config is true, the user strictly wants real responses
         */
        if (!$this->config['oembed'] && $response = $this->fakeResponse()) {
            $fakeResponse = new \Embera\FakeResponse($this->config, $response);

return $this->modifyResponse($fakeResponse->buildResponse());
        }

return array();
    }

/**
     * Appends custom parameters for the oembed request.
     *
     * @param array $params
     */
    public function appendParams(array $params = array())
    {
        $this->config['params'] = array_merge($this->config['params'], $params);
    }

/**
     * Returns the url.
     *
     * @return string
     */
    public function getUrl()
    {
        return (string) $this->url;
    }

/**
     * Returns an array with all the parameters for the oembed request.
     *
     * @return array
     */
    public function getParams()
    {
        return $this->config['params'];
    }

/**
     * Returns an array with found errors.
     *
     * @return array
     */
    public function getErrors()
    {
        return $this->errors;
    }

/**
     * This method fakes a Oembed response.
     *
     * It should be overwritten by the service
     * itself if the service is capable to determine
     * an html embed code based on the url or by other methods.
     *
     * @return array with data that the oembed response should have
     * @codeCoverageIgnore
     */
    public function fakeResponse()
    {
        return array();
    }

/**
     * Normalizes a url.
     * This method should be overwritten by the
     * service itself, if needed.
     *
     * Use the $this->url property to do the job
     */
    protected function normalizeUrl()
    {
    }

/**
     * Gives the ability to modify the response/fake-response array
     * from an oembed provider.
     *
     * It should be overwritten by the service when needed
     *
     * @param array $response
     *
     * @return array
     */
    protected function modifyResponse(array $response = array())
    {
        return $response;
    }
}

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