<?php
/**
 * @brief		ActiveRecord IteratorIterator
 * @since		21 Nov 2013
 */

namespace IPS\Patterns;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
	exit;
}

/**
 * ActiveRecord IteratorIterator
 */
class _ActiveRecordIterator extends \IteratorIterator implements \Countable
{
	/**
	 * @brief	Classname
	 */
	public $classname;

	/**
	 * @brief	Parent classname
	 */
	public $parentClassname = NULL;
		
	/**
	 * Constructor
	 *
	 * @param	\Traversable	$iterator			The iterator
	 * @param	string			$classname			The classname
	 * @param	string|NULL		$parentClass		Parent classname, if the parent data is also available (e.g. joined in a query)
	 * @return	void
	 */
	public function __construct( \Traversable $iterator, $classname, $parentClassname = NULL )
	{
		$this->classname		= $classname;
		$this->parentClassname	= $parentClassname;

		return parent::__construct( $iterator );
	}
	
	/**
	 * Get current
	 *
	 * @return	\IPS\Patterns\ActiveRecord
	 */
	public function current()
	{
		$current = parent::current();

		/* This is here purely to prime caches to prevent queries later. If we've already joined (or otherwise have) the data for another class, then we can construct
			an active record object of it in memory to prevent calls to load() against that class resulting in separate queries later. */
		if( $this->parentClassname !== NULL )
		{
			$parentClass = $this->parentClassname;

			/* We need to make sure we actually have the data first though */
			$idColumn = $parentClass::$databasePrefix . $parentClass::$databaseColumnId;

			if( isset( $current[ $idColumn ] ) )
			{
				$parentClass::constructFromData( $current );
			}
		}

		$classname = $this->classname;
		return $classname::constructFromData( $current );
	}
	
	/**
	 * Get count
	 *
	 * @return	int
	 */
	public function count()
	{
		return (int) $this->getInnerIterator()->count();
	}
}