<?php

abstract class CAS_Request_AbstractRequest implements CAS_Request_RequestInterface
{
	protected $url = null;
	protected $cookies = array();
	protected $headers = array();
	protected $isPost = false;
	protected $postBody = null;
	protected $caCertPath = null;
	protected $validateCN = true;
	private $_sent = false;
	private $_responseHeaders = array();
	private $_responseBody = null;
	private $_errorMessage = '';


	/**
	 * Set the URL of the Request
	 *
	 * @param string $url Url to set
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function setUrl($url)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->url = $url;
	}


	/**
	 * Add a cookie to the request.
	 *
	 * @param string $name  Name of entry
	 * @param string $value value of entry
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function addCookie($name, $value)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->cookies[$name] = $value;
	}


	/**
	 * Add an array of cookies to the request.
	 * The cookie array is of the form
	 *     array('cookie_name' => 'cookie_value', 'cookie_name2' => cookie_value2')
	 *
	 * @param array $cookies cookies to add
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function addCookies(array $cookies)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->cookies = array_merge($this->cookies, $cookies);
	}


	/**
	 * Add a header string to the request.
	 *
	 * @param string $header Header to add
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function addHeader($header)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->headers[] = $header;
	}


	/**
	 * Add an array of header strings to the request.
	 *
	 * @param array $headers headers to add
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function addHeaders(array $headers)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->headers = array_merge($this->headers, $headers);
	}


	/**
	 * Make the request a POST request rather than the default GET request.
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function makePost()
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}

		$this->isPost = true;
	}


	/**
	 * Add a POST body to the request
	 *
	 * @param string $body body to add
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function setPostBody($body)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}
		if (!$this->isPost) {
		    throw new CAS_OutOfSequenceException(
		        'Cannot add a POST body to a GET request, use makePost() first.'
		    );
		}

		$this->postBody = $body;
	}


	/**
	 * Specify the path to an SSL CA certificate to validate the server with.
	 *
	 * @param string $caCertPath  path to cert
	 * @param bool   $validate_cn valdiate CN of certificate
	 *
	 * @return void
	 * @throws CAS_OutOfSequenceException If called after the Request has been sent.
	 */
	public function setSslCaCert($caCertPath, $validate_cn = true)
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot '.__METHOD__
		    );
		}
		$this->caCertPath = $caCertPath;
		$this->validateCN = $validate_cn;
	}


	/**
	 * Perform the request.
	 *
	 * @return bool TRUE on success, FALSE on failure.
	 * @throws CAS_OutOfSequenceException If called multiple times.
	 */
	public function send()
	{
		if ($this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has already been sent cannot send again.'
		    );
		}
		if (is_null($this->url) || !$this->url) {
		    throw new CAS_OutOfSequenceException(
		        'A url must be specified via setUrl() before the request can be sent.'
		    );
		}
		$this->_sent = true;
		return $this->sendRequest();
	}


	/**
	 * Send the request and store the results.
	 *
	 * @return bool TRUE on success, FALSE on failure.
	 */
	abstract protected function sendRequest();


	/**
	 * Store the response headers.
	 *
	 * @param array $headers headers to store
	 *
	 * @return void
	 */
	protected function storeResponseHeaders(array $headers)
	{
		$this->_responseHeaders = array_merge($this->_responseHeaders, $headers);
	}


	/**
	 * Store a single response header to our array.
	 *
	 * @param string $header header to store
	 *
	 * @return void
	 */
	protected function storeResponseHeader($header)
	{
		$this->_responseHeaders[] = $header;
	}


	/**
	 * Store the response body.
	 *
	 * @param string $body body to store
	 *
	 * @return void
	 */
	protected function storeResponseBody($body)
	{
		$this->_responseBody = $body;
	}


	/**
	 * Add a string to our error message.
	 *
	 * @param string $message message to add
	 *
	 * @return void
	 */
	protected function storeErrorMessage($message)
	{
		$this->_errorMessage .= $message;
	}


	/**
	 * Answer the headers of the response.
	 *
	 * @return array An array of header strings.
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getResponseHeaders()
	{
		if (!$this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has not been sent yet. Cannot '.__METHOD__
		    );
		}
		return $this->_responseHeaders;
	}


	/**
	 * Answer HTTP status code of the response
	 *
	 * @return int
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 * @throws CAS_Request_Exception if the response did not contain a status code
	 */
	public function getResponseStatusCode()
	{
		if (!$this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has not been sent yet. Cannot '.__METHOD__
		    );
		}

		if (!preg_match(
		    '/HTTP\/[0-9.]+\s+([0-9]+)\s*(.*)/',
		    $this->_responseHeaders[0], $matches
		)
		) {
		    throw new CAS_Request_Exception(
		        'Bad response, no status code was found in the first line.'
		    );
		}

		return intval($matches[1]);
	}


	/**
	 * Answer the body of response.
	 *
	 * @return string
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getResponseBody()
	{
		if (!$this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has not been sent yet. Cannot '.__METHOD__
		    );
		}

		return $this->_responseBody;
	}


	/**
	 * Answer a message describing any errors if the request failed.
	 *
	 * @return string
	 * @throws CAS_OutOfSequenceException If called before the Request has been sent.
	 */
	public function getErrorMessage()
	{
		if (!$this->_sent) {
		    throw new CAS_OutOfSequenceException(
		        'Request has not been sent yet. Cannot '.__METHOD__
		    );
		}
		return $this->_errorMessage;
	}
}
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