<?php


/**
 * Thrown when an API call returns an exception.
 *
 * @author Naitik Shah <naitik@facebook.com>
 */
class Cana_Facebook_Exception extends Exception
{
	/**
 	* The result from the API server that represents the exception information.
 	*/
	protected $result;

	/**
 	* Make a new API Exception with the given result.
 	*
 	* @param array $result The result from the API server
 	*/
	public function __construct($result) {
		$this->result = $result;

		$code = isset($result['error_code']) ? $result['error_code'] : 0;

		if (isset($result['error_description'])) {
			// OAuth 2.0 Draft 10 style
			$msg = $result['error_description'];
		} else if (isset($result['error']) && is_array($result['error'])) {
			// OAuth 2.0 Draft 00 style
			$msg = $result['error']['message'];
		} else if (isset($result['error_msg'])) {
			// Rest server style
			$msg = $result['error_msg'];
		} else {
			$msg = 'Unknown Error. Check getResult()';
		}

		parent::__construct($msg, $code);
	}

	/**
 	* Return the associated result object returned by the API server.
 	*
 	* @return array The result from the API server
 	*/
	public function getResult() {
		return $this->result;
	}

	/**
 	* Returns the associated type for the error. This will default to
 	* 'Exception' when a type is not available.
 	*
 	* @return string
 	*/
	public function getType() {
		if (isset($this->result['error'])) {
			$error = $this->result['error'];
			if (is_string($error)) {
				// OAuth 2.0 Draft 10 style
				return $error;
			} else if (is_array($error)) {
				// OAuth 2.0 Draft 00 style
				if (isset($error['type'])) {
					return $error['type'];
				}
			}
		}

		return 'Exception';
	}

	/**
 	* To make debugging easier.
 	*
 	* @return string The string representation of the error
 	*/
	public function __toString() {
		$str = $this->getType() . ': ';
		if ($this->code != 0) {
			$str .= $this->code . ': ';
		}
		return $str . $this->message;
	}
}