<?php
/**
 * @copyright Copyright (C) 2020, Friendica
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

namespace Friendica\Model;

use Friendica\Core\Logger;
use Friendica\Database\DBA;
use Friendica\Content\Text\BBCode;

/**
 * Class Tag
 *
 * This Model class handles tag table interactions.
 * This tables stores relevant tags related to posts, like hashtags and mentions.
 */
class Tag
{
    const UNKNOWN           = 0;
    const HASHTAG           = 1;
    const MENTION           = 2;
    const CATEGORY          = 3;
    const FILE              = 5;
	/**
	 * An implicit mention is a mention in a comment body that is redundant with the threading information.
	 */
    const IMPLICIT_MENTION  = 8;
	/**
	 * An exclusive mention transfers the ownership of the post to the target account, usually a forum.
	 */
    const EXCLUSIVE_MENTION = 9;

    const TAG_CHARACTER = [
    	self::HASHTAG           => '#',
    	self::MENTION           => '@',
    	self::IMPLICIT_MENTION  => '%',
    	self::EXCLUSIVE_MENTION => '!',
    ];

	/**
	 * Store tags from the body
	 *
	 * @param integer $uriid
	 * @param string $body
	 */
	public static function storeFromBody(int $uriid, string $body)
	{
		$tags = BBCode::getTags($body);
		if (empty($tags)) {
			return;
		}

		foreach ($tags as $tag) {
			if ((substr($tag, 0, 1) != self::TAG_CHARACTER[self::HASHTAG]) || (strlen($tag) <= 1)) {
				Logger::info('Skip tag', ['uriid' => $uriid, 'tag' => $tag]);
				continue;
			}

			$fields = ['uri-id' => $uriid, 'name' => substr($tag, 1, 64), 'type' => self::HASHTAG];
			DBA::insert('tag', $fields, true);
			Logger::info('Stored tag', ['uriid' => $uriid, 'tag' => $tag, 'fields' => $fields]);
		}
	}
}