<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2025 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 <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace Fisharebest\Webtrees\Http\RequestHandlers;

use Fisharebest\Webtrees\Auth;
use Fisharebest\Webtrees\Date;
use Fisharebest\Webtrees\Elements\PedigreeLinkageType;
use Fisharebest\Webtrees\Fact;
use Fisharebest\Webtrees\Family;
use Fisharebest\Webtrees\Individual;
use Fisharebest\Webtrees\Registry;
use Fisharebest\Webtrees\Validator;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;

use function redirect;

final class LinkChildToFamilyAction implements RequestHandlerInterface
{
    public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $tree       = Validator::attributes($request)->tree();
        $xref       = Validator::attributes($request)->isXref()->string('xref');
        $individual = Registry::individualFactory()->make($xref, $tree);
        $individual = Auth::checkIndividualAccess($individual, true);
        $famid      = Validator::parsedBody($request)->isXref()->string('famid');
        $PEDI       = Validator::parsedBody($request)->string('PEDI');

        $family = Registry::familyFactory()->make($famid, $tree);
        $family = Auth::checkFamilyAccess($family, true);

        // Replace any existing child->family link (we may be changing the PEDI);
        $fact_id = '';
        foreach ($individual->facts(['FAMC']) as $fact) {
            if ($family === $fact->target()) {
                $fact_id = $fact->id();
                break;
            }
        }

        switch ($PEDI) {
            case '':
                $gedcom = "1 FAMC @$famid@";
                break;
            case PedigreeLinkageType::VALUE_ADOPTED:
                $gedcom = "1 FAMC @$famid@\n2 PEDI $PEDI\n1 ADOP\n2 FAMC @$famid@\n3 ADOP BOTH";
                break;
            case PedigreeLinkageType::VALUE_SEALING:
                $gedcom = "1 FAMC @$famid@\n2 PEDI $PEDI\n1 SLGC\n2 FAMC @$famid@";
                break;
            case PedigreeLinkageType::VALUE_FOSTER:
                $gedcom = "1 FAMC @$famid@\n2 PEDI $PEDI\n1 EVEN\n2 TYPE $PEDI";
                break;
            default:
                $gedcom = "1 FAMC @$famid@\n2 PEDI $PEDI";
                break;
        }

        if ($fact_id === '') {
            $individual->createFact($gedcom, true);
        } else {
            $individual->updateFact($fact_id, $gedcom, true);
        }

        // Only set the family->child link if it does not already exist
        $chil_link_exists = false;
        foreach ($family->facts(['CHIL']) as $fact) {
            if ($individual === $fact->target()) {
                $chil_link_exists = true;
                break;
            }
        }

        if (!$chil_link_exists) {
            $before = $this->childFactOfYoungerSibling($family, $individual);
            $family->createFact('1 CHIL @' . $individual->xref() . '@', true, $before);
        }

        return redirect($individual->url());
    }

    private function childFactOfYoungerSibling(Family $family, Individual $child): Fact | null
    {
        $filter = function (Fact $fact) use ($child): bool {
            return $fact->target() instanceof Individual &&
                Date::compare($child->getBirthDate(), $fact->target()->getBirthDate()) < 0;
        };
        return $family
            ->facts(['CHIL'], false, Auth::PRIV_HIDE, true)
            ->first($filter);
    }
}
