<?php
/**
 * This program 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; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2008-2010 (original work) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
 *               2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *
 */

/**
 * Short description of class tao_helpers_form_validators_DateTime
 *
 * @access public
 * @author Joel Bout, <joel.bout@tudor.lu>
 * @package tao

 */
class tao_helpers_form_validators_DateTime extends tao_helpers_form_Validator
{
    /**
     * (non-PHPdoc)
     * @see tao_helpers_form_Validator::evaluate()
     */
    public function evaluate($values)
    {
        $returnValue = (bool) false;

        
        $value = trim($values);
        
        try {
            $dateTime = new DateTime($value);
            
            // if no date given no need to go further. To check if not empty, use the NotEmpty validator
            if (!empty($value) && !empty($this->getOption('comparator')) && $this->getOption('datetime2_ref') instanceof tao_helpers_form_FormElement) {
                //try comparison:
                try {
                    $dateTime2 = new DateTime($this->getOption('datetime2_ref')->getRawValue());
                } catch (Exception $e) {
                }
                
                if ($dateTime2 instanceof DateTimeInterface) {
                    switch ($this->getOption('comparator')) {
                        case 'after':
                        case 'later':
                        case 'sup':
                        case '>':{
                            if ($dateTime > $dateTime2) {
                                    $returnValue = true;
                            } else {
                                $this->setMessage(__('Invalid date range (must be after: %s)', $dateTime2->format('Y-m-d')));
                            }
                            break;
                        }
                        case '>=':{
                            if ($dateTime >= $dateTime2) {
                                $returnValue = true;
                            } else {
                                $this->setMessage(__('Invalid date range (must be after or the same as: %s)', $dateTime2->format('Y-m-d')));
                            }
                            break;
                        }
                        case 'before':
                        case 'earlier':
                        case 'inf':
                        case '<':{
                            if ($dateTime < $dateTime2) {
                                $returnValue = true;
                            } else {
                                $this->setMessage(__('Invalid date range (must be before: %s)', $dateTime2->format('Y-m-d')));
                            }
                            break;
                        }
                        case '<=':{
                            if ($dateTime <= $dateTime2) {
                                $returnValue = true;
                            } else {
                                $this->setMessage(__('Invalid date range (must be before or the same as: %s)', $dateTime2->format('Y-m-d')));
                            }
                            break;
                        }
                        default:
                            throw new common_Exception('Usuported comparator in DateTime Validator: ' . $this->getOption('comparator'));
                    }
                }
            } else {
                $returnValue = true;
            }
        } catch (Exception $e) {
            $this->setMessage(__('The value of this field must be a valide date format, e.g. YYYY-MM-DD'));
            $returnValue = false;
        }
        
        

        return (bool) $returnValue;
    }
}