<?php

declare(strict_types=1);

/**
 * @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
 *
 * @author 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author 2023 Richard Steinmetz <richard@steinmetz.cloud>
 *
 * @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 <http://www.gnu.org/licenses/>.
 */

namespace OCA\Mail\Service\Classification\FeatureExtraction;

use OCA\Mail\Account;
use OCA\Mail\Db\Mailbox;
use OCA\Mail\Db\Message;

interface IExtractor {
	/**
	 * Initialize any data that is used for all messages and return whether the
	 * extractor is applicable for this account
	 *
	 * @param Account $account
	 * @param Mailbox[] $incomingMailboxes
	 * @param Mailbox[] $outgoingMailboxes
	 * @param Message[] $messages
	 */
	public function prepare(Account $account,
		array $incomingMailboxes,
		array $outgoingMailboxes,
		array $messages): void;

	/**
	 * Return the feature value for the given message
	 *
	 * @param Message $message
	 *
	 * @return float[]
	 */
	public function extract(Message $message): array;
}
