rval' => $this->checkPeriod * 3600,
				'display' => sprintf('Every %d hours', $this->checkPeriod),
			);
		}
		return $schedules;
	}
}

class Wslm_LicenseManagerApi {
	private $apiUrl;

	public function __construct($apiUrl) {
		$this->apiUrl = $apiUrl;
	}

	public function getLicense($product, $key, $siteUrl = null) {
		$params = ($siteUrl !== null) ? array('site_url' => $siteUrl) : array();
		return $this->get($this->endpoint($product, $key), $params);
	}

	public function licenseSite($product, $key, $siteUrl) {
		$params = array('site_url' => $siteUrl);
 		return $this->post($this->endpoint($product, $key, null, 'license_site'), $params);
	}

	public function unlicenseSite($product, $key, $siteUrl) {
		$params = array('site_url' => $siteUrl);
		return $this->post($this->endpoint($product, $key, null, 'unlicense_site'), $params);
	}

	public function getLicenseByToken($product, $token, $siteUrl = null) {
		$params = ($siteUrl !== null) ? array('site_url' => $siteUrl) : array();
		return $this->get($this->endpoint($product, null, $token), $params);
	}

	public function unlicenseSiteByToken($product, $token, $siteUrl) {
		$params = array('site_url' => $siteUrl);
 		return $this->post($this->endpoint($product, null, $token, 'unlicense_site'), $params);
	}

	public function get($endpoint, $params = array()) {
		return $this->request('get', $endpoint, $params);
	}

	public function post($endpoint, $params = array()) {
		return $this->request('post', $endpoint, $params);
	}

	private function endpoint($product, $license = null, $token = null, $action = null) {
		$endpoint = '/products/' . urlencode($product) . '/licenses/';
		$endpoint .= ($token !== null) ? 'bytoken/' . urlencode($token) : urlencode($license);
		if ( $action !== null ) {
			$endpoint .= '/' . $action;
		}
		return $endpoint;
	}

	/**
	 * Send an API request.
	 *
	 * @param string $method
	 * @param string $endpoint
	 * @param array $params
	 * @return Wslm_LicenseManagerApiResponse
	 */
	public function request($method, $endpoint, $params = array()) {
		$url = $this->getApiUrl($endpoint);
		$method = strtoupper($method);
		$args = array('method' => $method, 'timeout' => 30);

		if ( !empty($params) ) {
			if ( ($method === 'POST') || ($method === 'PUT') ) {
				$args['body'] = $params;
			} else {
				$url .= '?' . http_build_query($params, '', '&');
			}
		}

		$response = wp_remote_request($url, $args);
		return new Wslm_LicenseManagerApiResponse($response);
	}

	private function getApiUrl($endpoint) {
		return rtrim($this->apiUrl, '/') . '/' . ltrim($endpoint, '/');
	}
}

class Wslm_LicenseManagerApiResponse {
    public $response = null;
    public $httpCode;
    public $httpResponse;

	private $error = null;

	/**
	 * @param array|WP_Error $httpResponse
	 */
	public function __construct($httpResponse) {
		$this->httpResponse = $httpResponse;
		$this->httpCode = intval(wp_remote_retrieve_response_code($httpResponse));

		if ( is_wp_error($httpResponse) ) {
			$this->error = new WP_Error('api_request_failed', $httpResponse->get_error_message(), $this);
			$this->response = null;
		} else {
			//Attempt to parse the API response. Expect a JSON document.
			$data = json_decode(wp_remote_retrieve_body($httpResponse));
			if ( $data === null ) {
				$this->error = new WP_Error(
					'api_request_failed',
					'Failed to parse the response returned by the licensing API (expected JSON).',
					$this
				);
			}
			$this->response = $data;
		}
    }

	public function success() {
		return empty($this->error) && ($this->httpCode >= 200 && $this->httpCode < 400);
	}

	public function asWpError() {
		if ( $this->success() ) {
			return null;
		}

		if ( !empty($this->error) ) {
			return $this->error;
		} else if ( isset($this->response->error) ) {
			return new WP_Error($this->response->error->code, $this->response->error->message, $this);
		} else {
			return new WP_Error('http_' . $this->httpCode, 'HTTP error ' . $this->httpCode, $this);
		}
	}
}