<?php

App::uses('AppModel', 'Model');

/**
 * Regexp Model
 *
 */
class Regexp extends AppModel {

	public $actsAs = array(
			'SysLogLogable.SysLogLogable' => array(	// TODO Audit, logable
					'roleModel' => 'Role',
					'roleKey' => 'role_id',
					'change' => 'full'
			),
	);

	public $validate = array(
			'regexp' => array(
					'rule'    => 'checkRegexp',
					'message' => 'This is not a valid regular expression. Don\'t forget the delimiters!'
			)
	);

/**
 * Use table
 *
 * @var mixed False or table name
 */
	public $useTable = 'regexp';

	public function beforeValidate($options = array()) {
		$this->sanitizeModifiers($this->data['Regexp']['regexp']);
	}
	
	public function sanitizeModifiers(&$regex) {
		preg_match('/[a-zA-Z]*$/i', $regex, $modifiers);
		if (!empty($modifiers[0])) {
			$modifier_length = strlen($modifiers[0]);
			$regex = substr($regex, 0, -$modifier_length);
			$modifiers[0] = str_ireplace('e', '', $modifiers[0]);
			$regex .= $modifiers[0];
		}
	}
	
	public function checkRegexp() {
		if (@preg_replace($this->data['Regexp']['regexp'], 'success', $this->data['Regexp']['regexp']) != null) return true;
		return false;
	}

	// find all the similar Regular expressions and return them. If $delete is true, delete them instead of returning them.
	public function find_similar ($id, $delete = false) {
		$allRegexp = $this->find('all');
		$original = null;
		$finalArray = array();
		// Let's find and read the original so we know what to look for:
		foreach ($allRegexp as $k => $v) {
			if ($v['Regexp']['id'] == $id) {
				$original = $v;
			}
		}
		// if we found the original, let's try to find all of the regexp values that match the original in the regexp and replacement fields.
		// We should get a list of all the IDs (and their respective types) of regular expression entries that are duplicates created for various types.
		// ip-src /127.0.0.1/ -> '' and ip-dst /127.0.0.1/ -> '' (entries that blacklists the ip-source and ip-destination addresses 127.0.0.1) will be returned when editing
		// ip-src /127.0.0.1/ -> '', but other /127.0.0.1/ -> 'localhost' will not
		if ($original != null) {
			foreach ($allRegexp as $k => $v) {
				if ($original['Regexp']['regexp'] === $v['Regexp']['regexp'] && $original['Regexp']['replacement'] === $v['Regexp']['replacement']) {
					if ($delete) {
						// if the delete parameter is set to true, delete the regular expression. This is used for edits
						$this->delete($v['Regexp']['id']);
					} else {
						$finalArray[] = array($v['Regexp']['id'], $v['Regexp']['type']);
					}
				}
			}
		}
		return $finalArray;
	}

	public function replaceSpecific($string, $allRegexp = null, $type) {
		$orig = $string;
		foreach ($allRegexp as $regexp) {
			if (strlen($regexp['Regexp']['replacement']) && strlen($regexp['Regexp']['regexp']) && ($regexp['Regexp']['type'] === 'ALL' || $regexp['Regexp']['type'] === $type)) {
				$string = preg_replace($regexp['Regexp']['regexp'], $regexp['Regexp']['replacement'], $string);
			}
			if (!strlen($regexp['Regexp']['replacement']) && preg_match($regexp['Regexp']['regexp'], $string) && ($regexp['Regexp']['type'] === 'ALL' || $regexp['Regexp']['type'] === $type)) {
				return 0;
			}
		}
		if ($orig === $string) return 2;
		return 1;
	}
}