<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2018 webtrees development team
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 * 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, see <http://www.gnu.org/licenses/>.
 */

namespace Fisharebest\Webtrees\Census;

use Fisharebest\Webtrees\Date;
use Fisharebest\Webtrees\Individual;

/**
 * The number of children who are still living.
 */
class CensusColumnChildrenLiving extends AbstractCensusColumn implements CensusColumnInterface
{
    /**
     * Generate the likely value of this census column, based on available information.
     *
     * @param Individual $individual
     * @param Individual $head
     *
     * @return string
     */
    public function generate(Individual $individual, Individual $head): string
    {
        if ($individual->getSex() !== 'F') {
            return '';
        }

        $count = 0;
        foreach ($individual->getSpouseFamilies() as $family) {
            foreach ($family->getChildren() as $child) {
                if (
                    $child->getBirthDate()->isOK() &&
                    Date::compare($child->getBirthDate(), $this->date()) < 0 &&
                    $child->getBirthDate() != $child->getDeathDate() &&
                    (!$child->getDeathDate()->isOK() || Date::compare($child->getDeathDate(), $this->date()) > 0)
                ) {
                    $count++;
                }
            }
        }

        return (string) $count;
    }
}