<?php
/**
 * _Type_IndexedList object contains a list of objects (_Type_Object) that can be accessed through predefined indexes. 
 * @copyright	Copyright (c) 2012, PWF
 * @license		http://phpwebframework.com/License 
 * @version PWF_0.3.0
 */

class _Type_IndexedList
{

	private $list;

	private $map = array();

	private $indexForObject = 1;
	private $indexForSublist = 0;
	private $mapTypes = array(1,0);

	private $indexes = array();

	/**
	 * Adds an objec to the list 
	 * @param _Type_Object $object
	 */
	public function add(_Type_Object $object)
	{
		$this->list[] = $object;
		$this->mapObjectIndexes(count($this->list)-1, $object);
	}	
	
	/**
	 * If sets an object of the list depending to its consequence position 
	 * @param integer $i The consequence position of the object to the list 
	 * @param _Type_Object $object
	 */
	public function set($i,_Type_Object $object)
	{
		$this->list[$i] = $object;
		$this->mapObjectIndexes($i, $object);
	}
	
	/**
	 * It returns an object of the list depending to its consequence position 
	 * @param integer $i The consequence position of the object to the list 
	 */
	public function get($i)
	{
		return $this->list[$i];
	}

	/**
	 * It appends a second _Type_ObjectsList to the current 
	 * @param _Type_ObjectsList $list The list to be appended 
	 */
	public function appendList(_Type_ObjectsList $list)
	{
		if($list->size()>0)
		{
			foreach($list->objects() as $object)
			{
				$this->list[] = $object;
				$this->mapObjectIndexes(count($this->list)-1, $object);
			}
		}
	}

	/**
	 * It returns the number of objects in the list 
	 * @return number
	 */
	public function size()
	{
		return count($this->list);
	}


	/**
	 * It returns the objects of the list (array) 
	 * @return array of _Type_Object
	 */
	public function objects()
	{
		return $this->list;
	}


	/**
	 * Sets an index (property name) for retrieving object from the list based to given value
	 * This means that the index has a relationship one to one to list objects 
	 * (For example a unique id property)
	 * @param string $index The property 
	 */
	public function setIndexForObjects($index)
	{
		$this->indexes[$index] = $this->indexForObject;
		if(isset($this->list))
		{
			$this->appendIndexToList($key, $keyType);
		}
	}

	/**
	 * Sets an index (property name) for retrieving a sub list from the list based to given value 
	 * This means that the index may have a relationship one to many to list objects 
	 * @param string $index The property name 
	 */
	public function setIndexForSublists($index)
	{
		$this->indexes[$index] = $this->indexForSublist;
		if(isset($this->list))
		{
			$this->appendIndexToList($key, $keyType);
		}
	}

	/**
	 * Gets a sub list from the list based to the value of a predefined index by setIndexForSublists
	 * Even if there is only one object that correspond that value of the index a _Type_ObjectsList will 
   * be returned   
   * @param string $index The index predefined by setIndexForSublists
   * @param string $value The value of the property to generate the sub list
	 * @return _Type_ObjectsList
	 */
	public function getIndexedSublist($index,$value,$preserveIndexes = false)
	{
		$list = new _Type_ObjectsList();
		if(isset($this->map[$index][$value]))
		{
			if($preserveIndexes)
			{
				foreach($this->indexes as $index => $indexType)
				{
					if($indexType == $this->indexForObject)
					{
						$this->setIndexForObject($index);
					}
					else 
					{
						$this->setIndexForSublist($index);
					}
				}
			}
			foreach($this->map[$index][$value] as $o)
			{
				$list->add($o);
			}
		}
		return $list;
	}

	/**
	 * Gets an object from the list based to the value of a prefefiend index by setIndexForObjects
	 * @param string $index The index predefined by setIndexForObjects
	 * @param string $value The value of the property to get the object
	 */
	public function getIndexedObject($index,$value)
	{
		if(isset($this->map[$index][$value]))
		{
			return $this->list[$this->map[$index][$value]];
		}
		else 
		{
		  return null; 
		}
	}

	// TODO αν είναι αντικείμενο  και αν είναι λίστα; 
	/**
	 * Removes all objects from the list that fetch a specific index and a value 
	 * no matter what type of index is it (unique or sub list) 
	 * @param $index
	 * @param  $value
	 */
	public function removeByIndex($index,$value)
	{
		if(isset($this->map[$index][$value]))
		{
			unset($this->list[$this->map[$index][$value]]);
			unset($this->map[$index][$value]);
		}
	}

	/**
	 * Check if the list contains a indexed sublist based to the index property name and the value of it 
	 * The index should has been first seted with setIndexForSublists
	 * @param string $index
	 * @param string $value
	 * @return boolean
	 */
	public function containsIndexedSublist($index,$value)
	{
		return isset($this->map[$index][$value]) && is_array($this->map[$index][$value]);
	}

	/**
	 * Check if the list contains a indexed object based to the index property name and the value of it 
	 * @param string $index
	 * @param string $value
	 * @return boolean
	 */
	public function containsIndexedObject($index,$value)
	{
		return isset($this->map[$index][$value]) && !is_array($this->map[$index][$value]);
	}

	/**
	 * Maps the indexes properties based on their name to an object of the list 
	 * @param unknown_type $i
	 * @param _Type_Object $object
	 */
	private function mapObjectIndexes($i,_Type_Object $object)
	{
		$a = $object->toArray();
		foreach ($this->indexes as $index=>$indexType)
		{
			if(isset($a[$index]))
			{
				if($indexType==$this->indexForObject)
				{
					$this->map[$index][$a[$index]] = $i;
				}
				else
				{
					$this->map[$index][$a[$index]][] = $i;
				}
			}
		}
	}

	/**
	 * Adds an index to the list when the list in not empty 
	 * @param unknown_type $index
	 * @param unknown_type $indexType
	 */
	private function appendIndexToList($index,$indexType)
	{
		for($i=0; $i<_Array::size($this->list); $i++)
		{
			$o = $this->get($i);
			$a = $o->toArray();
			if(_Array::containsKey($a, $index))
			{
				if($indexType==$this->indexForObject)
				{
					$this->map[$index][$a[$index]] = $i;
				}
				else
				{
					$this->map[$index][$a[$index]][] = $i;
				}
			}
		}
	}
	

}
?>