<?php
/**
 * Copyright 2006 - 2012 Eric D. Hough (http://ehough.com)
 *
 * This file is part of TubePress (http://tubepress.org)
 *
 * TubePress 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.
 *
 * TubePress 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 TubePress.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

class_exists('org_tubepress_impl_classloader_ClassLoader') || require(dirname(__FILE__) . '/../classloader/ClassLoader.class.php');
org_tubepress_impl_classloader_ClassLoader::loadClasses(array(
    'org_tubepress_api_const_options_names_Display',
    'org_tubepress_api_const_options_Type',
    'org_tubepress_api_options_OptionDescriptorReference',
    'org_tubepress_impl_ioc_IocContainer',
	'org_tubepress_impl_util_LangUtils',
));

/**
 * Performs validation on option values
 */
class org_tubepress_impl_options_DefaultOptionValidator implements org_tubepress_api_options_OptionValidator
{
    const LOG_PREFIX = 'Option Validator';

    /**
     * Validates an option value.
     *
     * @param string       $optionName The option name
     * @param unknown_type $candidate  The candidate option value
     *
     * @return boolean True if the option name exists and the value supplied is valid. False otherwise.
    */
    public function isValid($optionName, $candidate)
    {
        return $this->getProblemMessage($optionName, $candidate) === null;
    }

    /**
     * Gets the failure message of a name/value pair that has failed validation.
     *
     * @param string       $optionName The option name
     * @param unknown_type $candidate  The candidate option value
     *
     * @return unknown Null if the option passes validation, otherwise a string failure message.
     */
    function getProblemMessage($optionName, $candidate)
    {
        $ioc        = org_tubepress_impl_ioc_IocContainer::getInstance();
        $odr        = $ioc->get(org_tubepress_api_options_OptionDescriptorReference::_);
        $descriptor = $odr->findOneByName($optionName);

        if ($descriptor === null) {

            return sprintf('No option with name %s', $optionName);
        }

        if ($descriptor->hasValidValueRegex()) {

            if (preg_match_all($descriptor->getValidValueRegex(), $candidate, $matches) === 1) {

                return null;
            }

            return sprintf('"%s" must match the regular expression %s. You supplied "%s".', $optionName, $descriptor->getValidValueRegex(), $candidate);
        }

        if ($descriptor->hasDiscreteAcceptableValues()) {

            $acceptableValues = $descriptor->getAcceptableValues();

            if (org_tubepress_impl_util_LangUtils::isAssociativeArray($acceptableValues)) {

                $values = array_keys($descriptor->getAcceptableValues());

            } else {

                $values = array_values($acceptableValues);
            }

            if (in_array($candidate, $values)) {

                return null;
            }

            return sprintf('"%s" must be one of {%s}. You supplied "%s".', $optionName, implode(', ', $values), $candidate);
        }

        if ($descriptor->isBoolean()) {

            if (is_bool($candidate)) {

                return null;
            }

            return sprintf('"%s" can only accept true/false values. You supplied "%s".', $optionName, $candidate);
        }

        return null;
    }
}