<?php declare(strict_types = 0);
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** 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 2 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, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/


class CItemHelper extends CItemGeneralHelper {

	/**
	 * @param string $src_templateid
	 * @param string $dst_templateid
	 *
	 * @return bool
	 */
	public static function cloneTemplateItems(string $src_templateid, string $dst_templateid): bool {
		$src_options = [
			'templateids' => $src_templateid,
			'inherited' => false
		];

		$dst_options = ['templateids' => [$dst_templateid]];

		return self::copy($src_options, $dst_options);
	}

	/**
	 * @param string $src_hostid
	 * @param string $dst_hostid
	 *
	 * @return bool
	 */
	public static function cloneHostItems(string $src_hostid, string $dst_hostid): bool {
		$src_options = [
			'hostids' => $src_hostid,
			'inherited' => false,
			'filter' => ['flags' => ZBX_FLAG_DISCOVERY_NORMAL]
		];

		$dst_options = ['hostids' => [$dst_hostid]];

		return self::copy($src_options, $dst_options);
	}

	/**
	 * @param array $src_options
	 * @param array $dst_options
	 *
	 * @return bool
	 */
	public static function copy(array $src_options, array $dst_options): bool {
		$src_items = self::getSourceItems($src_options);

		if (!$src_items) {
			return true;
		}

		$dst_hostids = reset($dst_options);

		$dst_valuemapids = self::getDestinationValueMaps($src_items, $dst_hostids);

		try {
			$dst_interfaceids = self::getDestinationHostInterfaces($src_items, $dst_options);
		}
		catch (Exception $e) {
			return false;
		}

		$src_itemids = array_fill_keys(array_keys($src_items), true);
		$src_dep_items = [];

		foreach ($src_items as $src_item) {
			if (array_key_exists($src_item['master_itemid'], $src_itemids)) {
				$src_dep_items[$src_item['master_itemid']][] = $src_item;

				unset($src_items[$src_item['itemid']]);
			}
		}

		try {
			$dst_master_itemids = self::getDestinationMasterItems($src_items, $dst_options);
		}
		catch (Exception $e) {
			return false;
		}

		do {
			$dst_items = [];

			foreach ($dst_hostids as $dst_hostid) {
				foreach ($src_items as $src_item) {
					$dst_item = ['hostid' => $dst_hostid] + array_diff_key($src_item, array_flip(['itemid', 'hosts']));

					if (array_key_exists($src_item['itemid'], $dst_valuemapids)) {
						$dst_item['valuemapid'] = $dst_valuemapids[$src_item['itemid']][$dst_hostid];
					}

					if (array_key_exists($src_item['itemid'], $dst_interfaceids)) {
						$dst_item['interfaceid'] = $dst_interfaceids[$src_item['itemid']][$dst_hostid];
					}

					if (array_key_exists($src_item['itemid'], $dst_master_itemids)) {
						$dst_item['master_itemid'] = $dst_master_itemids[$src_item['itemid']][$dst_hostid];
					}

					$dst_items[] = $dst_item;
				}
			}

			$response = API::Item()->create($dst_items);

			if ($response === false) {
				return false;
			}

			$_src_items = [];

			if ($src_dep_items) {
				foreach ($dst_hostids as $dst_hostid) {
					foreach ($src_items as $src_item) {
						$dst_itemid = array_shift($response['itemids']);

						if (array_key_exists($src_item['itemid'], $src_dep_items)) {
							foreach ($src_dep_items[$src_item['itemid']] as $src_dep_item) {
								$dst_master_itemids[$src_dep_item['itemid']][$dst_hostid] = $dst_itemid;
							}

							$_src_items = array_merge($_src_items, $src_dep_items[$src_item['itemid']]);
							unset($src_dep_items[$src_item['itemid']]);
						}
					}
				}
			}

			$src_items = $_src_items;
		} while ($src_items);

		return true;
	}

	/**
	 * @param array  $src_options
	 *
	 * @return array
	 */
	private static function getSourceItems(array $src_options): array {
		return API::Item()->get([
			'output' => ['itemid', 'name', 'type', 'key_', 'value_type', 'units', 'history', 'trends',
				'valuemapid', 'inventory_link', 'logtimefmt', 'description', 'status',

				// Type fields.
				// The fields used for multiple item types.
				'interfaceid', 'authtype', 'username', 'password', 'params', 'timeout', 'delay', 'trapper_hosts',

				// Dependent item type specific fields.
				'master_itemid',

				// HTTP Agent item type specific fields.
				'url', 'query_fields', 'request_method', 'post_type', 'posts',
				'headers', 'status_codes', 'follow_redirects', 'retrieve_mode', 'output_format', 'http_proxy',
				'verify_peer', 'verify_host', 'ssl_cert_file', 'ssl_key_file', 'ssl_key_password', 'allow_traps',

				// IPMI item type specific fields.
				'ipmi_sensor',

				// JMX item type specific fields.
				'jmx_endpoint',

				// Script item type specific fields.
				'parameters',

				// SNMP item type specific fields.
				'snmp_oid',

				// SSH item type specific fields.
				'publickey', 'privatekey'
			],
			'selectPreprocessing' => ['type', 'params', 'error_handler', 'error_handler_params'],
			'selectTags' => ['tag', 'value'],
			'selectHosts' => ['status'],
			'preservekeys' => true
		] + $src_options);
	}
}