<?php
/**
 * EMongoEmbeddedDocument.php
 *
 * PHP version 5.2+
 *
 * @author		Dariusz Górecki <darek.krk@gmail.com>
 * @author		Invenzzia Group, open-source division of CleverIT company http://www.invenzzia.org
 * @copyright	2011 CleverIT http://www.cleverit.com.pl
 * @license		http://www.yiiframework.com/license/ BSD license
 * @version		1.3
 * @category	ext
 * @package		ext.YiiMongoDbSuite
 * @since		v1.0.8
 */

/**
 * @since v1.0.8
 */
abstract class EMongoEmbeddedDocument extends CModel
{
	private static $_attributes=array();

	/**
	 * CMap of embedded documents
	 * @var CMap $_embedded
	 * @since v1.0.8
	 */
	protected $_embedded=null;

	/**
	 * Cacheed values for embeddedDocuments() method vall
	 * @var array $_embeddedConfig
	 * @since v1.3.2
	 */
	protected static $_embeddedConfig = array();

	/**
	 * Hold down owner pointer (if any)
	 *
	 * @var EMongoEmbeddedDocument $_owner
	 * @since v1.0.8
	 */
	protected $_owner=null;

	/**
	 * Constructor.
	 * @param string $scenario name of the scenario that this model is used in.
	 * See {@link CModel::scenario} on how scenario is used by models.
	 * @see getScenario
	 * @since v1.0.8
	 */
	public function __construct($scenario='insert')
	{
		$this->setScenario($scenario);
		$this->init();
		$this->attachBehaviors($this->behaviors());
		$this->afterConstruct();

		$this->initEmbeddedDocuments();
	}

	/**
	 * Initializes this model.
	 * This method is invoked in the constructor right after {@link scenario} is set.
	 * You may override this method to provide code that is needed to initialize the model (e.g. setting
	 * initial property values.)
	 * @since 1.0.8
	 */
	public function init(){}

	/**
	 * @since v1.0.8
	 */
	protected function initEmbeddedDocuments()
	{
		if(!$this->hasEmbeddedDocuments() || !$this->beforeEmbeddedDocsInit())
			return false;

		$this->_embedded = new CMap;
		if(!isset(self::$_embeddedConfig[get_class($this)]))
			self::$_embeddedConfig[get_class($this)] = $this->embeddedDocuments();
		$this->afterEmbeddedDocsInit();
	}

	/**
	 * @since v1.0.8
	 */
	public function onBeforeEmbeddedDocsInit($event)
	{
		$this->raiseEvent('onBeforeEmbeddedDocsInit', $event);
	}

	/**
	 * @since v1.0.8
	 */
	public function onAfterEmbeddedDocsInit($event)
	{
		$this->raiseEvent('onAfterEmbeddedDocsInit', $event);
	}

	/**
	 * @since v1.0.8
	 */
	public function onBeforeToArray($event)
	{
		$this->raiseEvent('onBeforeToArray', $event);
	}

	/**
	 * @since v1.0.8
	 */
	public function onAfterToArray($event)
	{
		$this->raiseEvent('onAfterToArray', $event);
	}

	/**
	 * @since v1.0.8
	 */
	protected function beforeToArray()
	{
		$event = new CModelEvent($this);
		$this->onBeforeToArray($event);
		return $event->isValid;
	}

	/**
	 * @since v1.0.8
	 */
	protected function afterToArray()
	{
		$this->onAfterToArray(new CModelEvent($this));
	}

	/**
	 * @since v1.0.8
	 */
	protected function beforeEmbeddedDocsInit()
	{
		$event=new CModelEvent($this);
		$this->onBeforeEmbeddedDocsInit($event);
		return $event->isValid;
	}

	/**
	 * @since v1.0.8
	 */
	protected function afterEmbeddedDocsInit()
	{
		$this->onAfterEmbeddedDocsInit(new CModelEvent());
	}

	/**
	 * @since v1.0.8
	 */
	public function __get($name)
	{
		if($this->hasEmbeddedDocuments() && isset(self::$_embeddedConfig[get_class($this)][$name])) {
			// Late creation of embedded documents on first access
			if (is_null($this->_embedded->itemAt($name))) {
				$docClassName = self::$_embeddedConfig[get_class($this)][$name];
				$doc = new $docClassName($this->getScenario());
				$doc->setOwner($this);
				$this->_embedded->add($name, $doc);
			}
			return $this->_embedded->itemAt($name);
		}
		else
			return parent::__get($name);
	}

	/**
	 * @since v1.0.8
	 */
	public function __set($name, $value)
	{
		if($this->hasEmbeddedDocuments() && isset(self::$_embeddedConfig[get_class($this)][$name]))
		{
			if(is_array($value)) {
				// Late creation of embedded documents on first access
				if (is_null($this->_embedded->itemAt($name))) {
					$docClassName = self::$_embeddedConfig[get_class($this)][$name];
					$doc = new $docClassName($this->getScenario());
					$doc->setOwner($this);
					$this->_embedded->add($name, $doc);
				}
				return $this->_embedded->itemAt($name)->attributes=$value;
			}
			else if($value instanceof EMongoEmbeddedDocument)
				return $this->_embedded->add($name, $value);
		}
		else
			parent::__set($name, $value);
	}

	/**
	 * @since v1.3.2
	 * @see CComponent::__isset()
	 */
	public function __isset($name) {
		if($this->hasEmbeddedDocuments() && isset(self::$_embeddedConfig[get_class($this)][$name]))
		{
			return isset($this->_embedded[$name]);
		}
		else
			return parent::__isset($name);
	}

	/**
	 * @since v1.0.8
	 */
	public function afterValidate()
	{
		if($this->hasEmbeddedDocuments())
			foreach($this->_embedded as $doc)
			{
				if(!$doc->validate())
				{
					$this->addErrors($doc->getErrors());
				}
			}
		$this->onAfterValidate(new CEvent($this));
	}

	/**
	 * @since v1.0.8
	 */
	public function embeddedDocuments()
	{
		return array();
	}

	/**
	 * @since v1.0.8
	 */
	public function hasEmbeddedDocuments()
	{
		if(isset(self::$_embeddedConfig[get_class($this)]))
			return true;
		return count($this->embeddedDocuments()) > 0;
	}

	/**
	 * Returns the list of attribute names.
	 * By default, this method returns all public properties of the class.
	 * You may override this method to change the default.
	 * @return array list of attribute names. Defaults to all public properties of the class.
	 * @since v1.0.8
	 */
	public function attributeNames()
	{
		$className=get_class($this);
		if(!isset(self::$_attributes[$className]))
		{
			$class=new ReflectionClass(get_class($this));
			$names=array();
			foreach($class->getProperties() as $property)
			{
				$name=$property->getName();
				if($property->isPublic() && !$property->isStatic())
					$names[]=$name;
			}
			if($this->hasEmbeddedDocuments())
			{
				$names = array_merge($names, array_keys(self::$_embeddedConfig[get_class($this)]));
			}
			return self::$_attributes[$className]=$names;
		}
		else
			return self::$_attributes[$className];
	}

	/**
	 * Returns the given object as an associative array
	 * Fires beforeToArray and afterToArray events
	 * @return array an associative array of the contents of this object
	 * @since v1.0.8
	 */
	public function toArray()
	{
		if($this->beforeToArray())
		{
			$arr = $this->_toArray();
			$this->afterToArray();
			return $arr;
		}
		else
			return array();
	}

	/**
	 * This method does the actual convertion to an array
	 * Does not fire any events
	 * @return array an associative array of the contents of this object
	 * @since v1.3.4
	 */
	protected function _toArray()
	{
		$arr = array();
		$class=new ReflectionClass(get_class($this));
		foreach($class->getProperties() as $property)
		{
			$name=$property->getName();
			if($property->isPublic() && !$property->isStatic())
				$arr[$name] = $this->$name;
		}
		if($this->hasEmbeddedDocuments())
			foreach($this->_embedded as $key=>$value)
				$arr[$key]=$value->toArray();

		return $arr;
	}

	/**
	 * Return owner of this document
	 * @return EMongoEmbeddedDocument
	 * @since v1.0.8
	 */
	public function getOwner()
	{
		if($this->_owner!==null)
			return $this->_owner;
		else
			return null;
	}

	/**
	 * Set owner of this document
	 * @param EMongoEmbeddedDocument $owner
	 * @since v1.0.8
	 */
	public function setOwner(EMongoEmbeddedDocument $owner)
	{
		$this->_owner = $owner;
	}

	/**
	 * Override default seScenario method for populating to embedded records
	 * @see CModel::setScenario()
	 * @since v1.0.8
	 */
	public function setScenario($value)
	{
		if($this->hasEmbeddedDocuments() && $this->_embedded !== null)
		{
			foreach($this->_embedded as $doc)
				$doc->setScenario($value);
		}
		parent::setScenario($value);
	}
}