<?php defined('SYSPATH') OR die('No direct script access.');

/**
 * LDAP database result.   See [Results](/database/results) for usage and examples.
 *
 * @package    Kohana/Database
 * @category   Query/Result
 * @author     Deon George
 * @copyright  (c) 2013 phpLDAPadmin Development Team
 * @license    http://dev.phpldapadmin.org/license.html
 */
abstract class Kohana_Database_LDAP_Result extends Database_Result {
	private $_current_entry = NULL;

	/** SeekableIterator **/

	/**
	 * Implements [Iterator::current], returns the current LDAP Leaf Entry.
	 *
	 * @return mixed LDAP leaf array of values
	 */
	public function current() {
		if (! $this->_current_entry)
			return array();

		// Return an array of the row
		// @todo We could probably cache this for optimisation
		$attrs = $vals = array();
		array_push($attrs,ldap_first_attribute($this->_result['l'],$this->_current_entry));

		while ($x = ldap_next_attribute($this->_result['l'],$this->_current_entry))
			array_push($attrs,$x);

		foreach ($attrs as $attr) {
			$vals[strtolower($attr)] = ldap_get_values($this->_result['l'],$this->_current_entry,$attr);

			// We dont need the count entry
			unset($vals[strtolower($attr)]['count']);
		}

		$vals['dn'] = $this->key();

		if ($this->_as_object === TRUE) {
			// Return an stdClass
			throw HTTP_Exception::factory(501,'Not implemented',array(':method'=>__METHOD__));

		} elseif (is_string($this->_as_object)) {
			$x = new $this->_as_object;

			return $x->result_load_values($vals);

		} else {
			return $vals;
		}
	}

	/**
	 * Implements [Iterator::key], returns the dn.
	 *
	 * echo key($result);
	 *
	 * @return string LDAP Distringuised Name
	 */
	public function key() {
		return ldap_get_dn($this->_result['l'],$this->_current_entry);
	}

	/**
	 * Implements [Iterator::next], moves to the next row.
	 *
	 * next($result);
	 *
	 * @return $this
	 */
	public function next() {
		$this->_current_entry = ldap_next_entry($this->_result['l'],$this->_current_entry);
		++$this->_current_row;

		return $this;
	}

	/**
	 * @override We cant go backwards!
	 */
	public function prev() {
		throw new Kohana_Exception('Cant go backwards');
	}

	/**
	 * Implements [Iterator::rewind], moves to the first entry.
	 *
	 * reset($result);
	 *
	 * @return void
	 */
	public function rewind() {
		if ($this->_total_rows)
			$this->_current_entry = ldap_first_entry($this->_result['l'],$this->_result['r']);

		$this->_current_row = 0;
	}

	/**
	 * Implements [SeekableIterator::seek], to seek to an entry.
	 *
	 * [!!] This method is only used internally.
	 *
	 * @return boolean
	 */
	public function seek($dn) {
		$this->_current_entry = ldap_first_entry($this->_result['l'],$this->_result['r']);

		do {
			if ($dn == $this->key())
				return TRUE;

			// Increment internal row for optimization assuming rows are fetched in order
			$this->_current_entry = ldap_next_entry($this->_result['l'],$this->_current_entry);

		} while ($this->_current_entry);

		// We didnt find it
		return FALSE;
	}

	/**
	 * Implements [Iterator::valid], checks if the current row exists.
	 *
	 * [!!] This method is only used internally.
	 *
	 * @return boolean
	 */
	public function valid() {
		return (boolean)$this->_current_entry;
	}

	/** ArrayAccess **/

	public function offsetExists($offset) {
		return $this->valid();
	}

	/** Custom Methods **/

	public function __construct($result, $sql, $as_object = FALSE, array $params = NULL) {
		parent::__construct($result, $sql, $as_object, $params);

		// Find the number of rows in the result
		$this->_total_rows = ldap_count_entries($result['l'],$result['r']);
		$this->_current_entry = ldap_first_entry($result['l'],$result['r']);

		if (! $this->_total_rows)
			$this->__destruct();
	}

	public function __destruct() {
		if (is_resource($this->_result['r']))
			ldap_free_result($this->_result['r']);
	}

	public function as_array($key=NULL,$value=NULL) {
		$result = array();

		if ($key === NULL AND $value === NULL) {
			// Indexed rows
			foreach ($this as $dn => $row)
				$result[$dn] = $row;

		} elseif ($key === NULL) {
			throw HTTP_Exception::factory(501,'Not implemented :method',array(':method'=>__METHOD__));

			// Indexed columns

		} elseif ($value === NULL) {
			throw HTTP_Exception::factory(501,'Not implemented :method',array(':method'=>__METHOD__));

			// Associative rows

		} else {
			throw HTTP_Exception::factory(501,'Not implemented :method',array(':method'=>__METHOD__));

			// Associative columns
		}

		return $result;
	}
} // End Database_LDAP_Result
?>