<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2022 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\CommonMark;

use Fisharebest\Webtrees\Gedcom;
use Fisharebest\Webtrees\GedcomRecord;
use Fisharebest\Webtrees\Registry;
use Fisharebest\Webtrees\Tree;
use League\CommonMark\Parser\Inline\InlineParserInterface;
use League\CommonMark\Parser\Inline\InlineParserMatch;
use League\CommonMark\Parser\InlineParserContext;

/**
 * Convert XREFs within markdown text to links
 */
class XrefParser implements InlineParserInterface
{
    private Tree $tree;

    /**
     * MarkdownXrefParser constructor.
     *
     * @param Tree $tree Match XREFs in this tree
     */
    public function __construct(Tree $tree)
    {
        $this->tree = $tree;
    }

    /**
     * We are only interested in text that begins with '@'.
     *
     * @return InlineParserMatch
     */
    public function getMatchDefinition(): InlineParserMatch
    {
        return InlineParserMatch::regex('@(' . Gedcom::REGEX_XREF . ')@');
    }

    /**
     * @param InlineParserContext $inlineContext
     *
     * @return bool
     */
    public function parse(InlineParserContext $inlineContext): bool
    {
        $cursor = $inlineContext->getCursor();
        [$xref] = $inlineContext->getSubMatches();
        $record = Registry::gedcomRecordFactory()->make($xref, $this->tree);

        if ($record instanceof GedcomRecord) {
            $cursor->advanceBy($inlineContext->getFullMatchLength());

            $inlineContext->getContainer()->appendChild(new XrefNode($record));

            return true;
        }

        return false;
    }
}