<?php
/**
 * @version		$Id: parameter.php 18650 2010-08-26 13:28:49Z ian $
 * @copyright	Copyright (C) 2005 - 2010 Open Source Matters, Inc. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

// No direct access
defined('JPATH_BASE') or die;

jimport('joomla.registry.registry');

// Register the element class with the loader.
JLoader::register('JElement', dirname(__FILE__).'/parameter/element.php');

/**
 * Parameter handler
 *
 * @package		Joomla.Framework
 * @subpackage	Parameter
 * @since		1.5
 */
class JParameter extends JRegistry
{
	/**
	 * The raw params string
	 *
	 * @var		string
	 * @since	1.5
	 */
	protected $_raw = null;

	/**
	 * The xml params element
	 *
	 * @var		object
	 * @since	1.5
	 */
	protected $_xml = null;

	/**
	* loaded elements
	*
	* @var		array
	* @since	1.5
	*/
	protected $_elements = array();

	/**
	* directories, where element types can be stored
	*
	* @var		array
	* @since	1.5
	*/
	protected $_elementPath = array();

	/**
	 * Constructor
	 *
	 * @param	string	The raw parms text.
	 * @param	string	Path to the xml setup file.
	 * @since	1.5
	 */
	public function __construct($data = '', $path = '')
	{
		parent::__construct('_default');

		// Set base path.
		$this->_elementPath[] = dirname(__FILE__).'/parameter/element';

		if ($data = trim($data)) {
			if (strpos($data, '{') === 0) {
				$this->loadJSON($data);
			} else {
				$this->loadINI($data);
			}
		}

		if ($path) {
			$this->loadSetupFile($path);
		}

		$this->_raw = $data;
	}

	/**
	 * Sets a default value if not alreay assigned.
	 *
	 * @param	string	The name of the parameter.
	 * @param	string	An optional value for the parameter.
	 * @param	string	An optional group for the parameter.
	 * @return	string	The value set, or the default if the value was not previously set (or null).
	 * @since	1.5
	 */
	public function def($key, $default = '', $group = '_default')
	{
		$value = $this->get($key, (string) $default, $group);
		return $this->set($key, $value);
	}

	/**
	 * Sets the XML object from custom xml files.
	 *
	 * @param	JSimpleXMLElement	An XML object.
	 * @since	1.5
	 */
	public function setXML(&$xml)
	{
		if (is_object($xml)) {
			if ($group = $xml->attributes('group')) {
				$this->_xml[$group] = $xml;
			} else {
				$this->_xml['_default'] = $xml;
			}

			if ($dir = $xml->attributes('addpath')) {
				$this->addElementPath(JPATH_ROOT . str_replace('/', DS, $dir));
			}
		}
	}

	/**
	 * Bind data to the parameter.
	 *
	 * @param	mixed	An array or object.
	 * @param	string	An optional group that the data should bind to. The default group is used if not supplied.
	 * @return	boolean	True if the data was successfully bound, false otherwise.
	 * @since	1.5
	 */
	public function bind($data, $group = '_default')
	{
		if (is_array($data)) {
			return $this->loadArray($data, $group);
		} elseif (is_object($data)) {
			return $this->loadObject($data, $group);
		} else {
			return $this->loadJSON($data, $group);
		}
	}

	/**
	 * Render the form control.
	 *
	 * @param	string	An optional name of the HTML form control. The default is 'params' if not supplied.
	 * @param	string	An optional group to render.  The default group is used if not supplied.
	 * @return	string	HTML
	 * @since	1.5
	 */
	public function render($name = 'params', $group = '_default')
	{
		if (!isset($this->_xml[$group])) {
			return false;
		}

		$params = $this->getParams($name, $group);
		$html = array ();

		if ($description = $this->_xml[$group]->attributes('description')) {
			// add the params description to the display
			$desc	= JText::_($description);
			$html[]	= '<p class="paramrow_desc">'.$desc.'</p>';
		}

		foreach ($params as $param) {
			if ($param[0]) {
				$html[] = $param[0];
				$html[] = $param[1];
			} else {
				$html[] = $param[1];
			}
		}

		if (count($params) < 1) {
			$html[] = "<p class=\"noparams\">".JText::_('JLIB_HTML_NO_PARAMETERS_FOR_THIS_ITEM')."</p>";
		}

		return implode(PHP_EOL, $html);
	}

	/**
	 * Render all parameters to an array.
	 *
	 * @param	string	An optional name of the HTML form control. The default is 'params' if not supplied.
	 * @param	string	An optional group to render.  The default group is used if not supplied.
	 * @return	array
	 * @since	1.5
	 */
	public function renderToArray($name = 'params', $group = '_default')
	{
		if (!isset($this->_xml[$group])) {
			return false;
		}
		$results = array();
		foreach ($this->_xml[$group]->children() as $param)  {
			$result = $this->getParam($param, $name, $group);
			$results[$result[5]] = $result;
		}
		return $results;
	}

	/**
	 * Return the number of parameters in a group.
	 *
	 * @param	string	An optional group.  The default group is used if not supplied.
	 * @return	mixed	False if no params exist or integer number of parameters that exist.
	 * @since	1.5
	 */
	public function getNumParams($group = '_default')
	{
		if (!isset($this->_xml[$group]) || !count($this->_xml[$group]->children())) {
			return false;
		} else {
			return count($this->_xml[$group]->children());
		}
	}

	/**
	 * Get the number of params in each group.
	 *
	 * @return	array	Array of all group names as key and parameters count as value.
	 * @since	1.5
	 */
	public function getGroups()
	{
		if (!is_array($this->_xml)) {
			return false;
		}

		$results = array();
		foreach ($this->_xml as $name => $group)  {
			$results[$name] = $this->getNumParams($name);
		}
		return $results;
	}

	/**
	 * Render all parameters.
	 *
	 * @param	string	An optional name of the HTML form control. The default is 'params' if not supplied.
	 * @param	string	An optional group to render.  The default group is used if not supplied.
	 * @return	array	An array of all parameters, each as array of the label, the form element and the tooltip.
	 * @since	1.5
	 */
	public function getParams($name = 'params', $group = '_default')
	{
		if (!isset($this->_xml[$group])) {
			return false;
		}

		$results = array();
		foreach ($this->_xml[$group]->children() as $param)  {
			$results[] = $this->getParam($param, $name, $group);
		}
		return $results;
	}

	/**
	 * Render a parameter type.
	 *
	 * @param	object	A parameter XML element.
	 * @param	string	An optional name of the HTML form control. The default is 'params' if not supplied.
	 * @param	string	An optional group to render.  The default group is used if not supplied.
	 * @return	array	Any array of the label, the form element and the tooltip.
	 * @since	1.5
	 */
	public function getParam(&$node, $control_name = 'params', $group = '_default')
	{
		// Get the type of the parameter.
		$type = $node->attributes('type');

		$element = $this->loadElement($type);

		// Check for an error.
		if ($element === false) {
			$result = array();
			$result[0] = $node->attributes('name');
			$result[1] = JText::_('Element not defined for type').' = '.$type;
			$result[5] = $result[0];
			return $result;
		}

		// Get value.
		$value = $this->get($node->attributes('name'), $node->attributes('default'), $group);

		return $element->render($node, $value, $control_name);
	}

	/**
	 * Loads an xml setup file and parses it.
	 *
	 * @param	string	A path to the XML setup file.
	 * @return	object
	 * @since	1.5
	 */
	public function loadSetupFile($path)
	{
		$result = false;

		if ($path) {
			$xml = JFactory::getXMLParser('Simple');

			if ($xml->loadFile($path)) {
				if ($params = $xml->document->params) {
					foreach ($params as $param) {
						$this->setXML($param);
						$result = true;
					}
				}
			}
		} else {
			$result = true;
		}

		return $result;
	}

	/**
	 * Loads an element type.
	 *
	 * @param	string	The element type.
	 * @param	boolean	False (default) to reuse parameter elements; true to load the parameter element type again.
	 * @return	object
	 * @since	1.5
	 */
	public function loadElement($type, $new = false)
	{
		$signature = md5($type);

		if ((isset($this->_elements[$signature]) && !($this->_elements[$signature] instanceof __PHP_Incomplete_Class))  && $new === false) {
			return	$this->_elements[$signature];
		}

		$elementClass	=	'JElement'.$type;
		if (!class_exists($elementClass)) {
			if (isset($this->_elementPath)) {
				$dirs = $this->_elementPath;
			} else {
				$dirs = array();
			}

			$file = JFilterInput::getInstance()->clean(str_replace('_', DS, $type).'.php', 'path');

			jimport('joomla.filesystem.path');
			if ($elementFile = JPath::find($dirs, $file)) {
				include_once $elementFile;
			} else {
				$false = false;
				return $false;
			}
		}

		if (!class_exists($elementClass)) {
			$false = false;
			return $false;
		}

		$this->_elements[$signature] = new $elementClass($this);

		return $this->_elements[$signature];
	}

	/**
	 * Add a directory where JParameter should search for element types.
	 *
	 * You may either pass a string or an array of directories.
	 *
	 * JParameter will be searching for a element type in the same
	 * order you added them. If the parameter type cannot be found in
	 * the custom folders, it will look in
	 * JParameter/types.
	 *
	 * @param	string|array	Directory or directories to search.
	 * @since	1.5
	 */
	public function addElementPath($path)
	{
		// Just force path to array.
		settype($path, 'array');

		// Loop through the path directories.
		foreach ($path as $dir) {
			// No surrounding spaces allowed!
			$dir = trim($dir);

			// Add trailing separators as needed.
			if (substr($dir, -1) != DIRECTORY_SEPARATOR) {
				// Directory
				$dir .= DIRECTORY_SEPARATOR;
			}

			// Add to the top of the search dirs.
			array_unshift($this->_elementPath, $dir);
		}
	}
}