#Gocha#

<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/** Configurable Reports
  * A Moodle block for creating customizable reports
  * @package blocks
  * @author: Juan leyva <http://www.twitter.com/jleyvadelgado>
  * @date: 2009
  */

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
}

require_once($CFG->libdir.'/formslib.php');

class conditions_form extends moodleform {
    function definition() {
        global $DB, $USER, $CFG;

$mform =& $this->_form;

$mform->addElement('static', 'help','',get_string('conditionexprhelp','block_configurable_reports'));
        $mform->addElement('text', 'conditionexpr', get_string('conditionexpr','block_configurable_reports'),'size="50"');
        $mform->setType('conditionexpr', PARAM_RAW);
		$mform->addHelpButton('conditionexpr','conditionexpr_conditions', 'block_configurable_reports');

// buttons
        $this->add_action_buttons(true, get_string('update'));

}

function validation($data, $files){
		$errors = parent::validation($data, $files);
		// TODO - this reg expr can be improved
		if(!preg_match("/($*\s*\bc\d{1,2}\b\s*\(*$*\s*($|and|or|not)\s*)+\(*\s*\bc\d{1,2}\b\s*\(*$*\s*$/i",$data['conditionexpr']))
			$errors['conditionexpr'] = get_string('badconditionexpr','block_configurable_reports');

if(substr_count($data['conditionexpr'],'(') != substr_count($data['conditionexpr'],')'))
			$errors['conditionexpr'] = get_string('badconditionexpr','block_configurable_reports');

if(isset($this->_customdata['elements']) && is_array($this->_customdata['elements'])){
			$elements = $this->_customdata['elements'];
			$nel = count($elements);
			if(!empty($elements) && $nel > 1){
				preg_match_all('/(\d+)/',$data['conditionexpr'],$matches,PREG_PATTERN_ORDER);
				foreach($matches[0] as $num){
					if($num > $nel){
						$errors['conditionexpr'] = get_string('badconditionexpr','block_configurable_reports');
						break;
					}
				}
			}
		}

return $errors;
	}
}