<?php declare(strict_types = 0);
/*
** Copyright (C) 2001-2024 Zabbix SIA
**
** 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, version 3.
**
** 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/>.
**/


/**
 * A class for accessing once loaded parameters of Housekeeping API object.
 */
class CHousekeepingHelper {

	public const COMPRESS_OLDER = 'compress_older';
	public const COMPRESSION_STATUS = 'compression_status';
	public const DB_EXTENSION = 'db_extension';
	public const HK_AUDIT = 'hk_audit';
	public const HK_AUDIT_MODE = 'hk_audit_mode';
	public const HK_EVENTS_AUTOREG = 'hk_events_autoreg';
	public const HK_EVENTS_DISCOVERY = 'hk_events_discovery';
	public const HK_EVENTS_INTERNAL = 'hk_events_internal';
	public const HK_EVENTS_MODE = 'hk_events_mode';
	public const HK_EVENTS_TRIGGER = 'hk_events_trigger';
	public const HK_EVENTS_SERVICE = 'hk_events_service';
	public const HK_HISTORY = 'hk_history';
	public const HK_HISTORY_GLOBAL = 'hk_history_global';
	public const HK_HISTORY_MODE = 'hk_history_mode';
	public const HK_SERVICES = 'hk_services';
	public const HK_SERVICES_MODE = 'hk_services_mode';
	public const HK_SESSIONS = 'hk_sessions';
	public const HK_SESSIONS_MODE = 'hk_sessions_mode';
	public const HK_TRENDS = 'hk_trends';
	public const HK_TRENDS_GLOBAL = 'hk_trends_global';
	public const HK_TRENDS_MODE = 'hk_trends_mode';

	public const OVERRIDE_NEEDED_HISTORY =	'hk_needs_override_history';
	public const OVERRIDE_NEEDED_TRENDS =	'hk_needs_override_trends';

	private const DBVERSION_COMPRESSED_CHUNKS_HISTORY = 'compressed_chunks_history';
	private const DBVERSION_COMPRESSED_CHUNKS_TRENDS = 'compressed_chunks_trends';

	protected static $params = [];

	/**
	 * Get the value of the given Housekeeping API object's field.
	 *
	 * @param string $field
	 *
	 * @throws Exception
	 *
	 * @return string
	 */
	public static function get(string $field): string {
		if (!self::$params) {
			self::$params = API::Housekeeping()->get([
				'output' => [
					'hk_events_mode', 'hk_events_trigger', 'hk_events_service', 'hk_events_internal',
					'hk_events_discovery', 'hk_events_autoreg', 'hk_services_mode', 'hk_services', 'hk_audit_mode',
					'hk_audit', 'hk_sessions_mode', 'hk_sessions', 'hk_history_mode', 'hk_history_global', 'hk_history',
					'hk_trends_mode', 'hk_trends_global', 'hk_trends', 'db_extension', 'compression_status',
					'compress_older'
				]
			]);

			if (self::$params === false) {
				throw new Exception(_('Unable to load housekeeping API parameters.'));
			}
		}

		return self::$params[$field];
	}

	/**
	 * @return array
	 */
	public static function getWarnings(): array {
		$warnings = [];

		foreach (CSettingsHelper::getDbVersionStatus() as $dbversion) {
			if ($dbversion['database'] === ZBX_DB_EXTENSION_TIMESCALEDB) {
				$compression_available = array_key_exists('compression_availability', $dbversion)
					&& $dbversion['compression_availability'];

				if ($compression_available) {
					$warnings[self::OVERRIDE_NEEDED_HISTORY] =
						array_key_exists(self::DBVERSION_COMPRESSED_CHUNKS_HISTORY, $dbversion)
							&& $dbversion[self::DBVERSION_COMPRESSED_CHUNKS_HISTORY] == 1;

					$warnings[self::OVERRIDE_NEEDED_TRENDS] =
						array_key_exists(self::DBVERSION_COMPRESSED_CHUNKS_TRENDS, $dbversion)
							&& $dbversion[self::DBVERSION_COMPRESSED_CHUNKS_TRENDS] == 1;
				}

				break;
			}
		}

		return array_filter($warnings);
	}
}
