<?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.
**/


namespace Zabbix\Widgets\Fields;

use Zabbix\Widgets\CWidgetField;

class CWidgetFieldNavTree extends CWidgetField {

	public const DEFAULT_VALUE = [];

	public function __construct(string $name, string $label = null) {
		parent::__construct($name, $label);

		$this
			->setDefault(self::DEFAULT_VALUE)
			->setSaveType(ZBX_WIDGET_FIELD_TYPE_STR)
			->setValidationRules(['type' => API_OBJECTS, 'flags' => API_PRESERVE_KEYS, 'fields' => [
				'name'		=> ['type' => API_STRING_UTF8, 'flags' => API_REQUIRED | API_NOT_EMPTY, 'length' => 255],
				'order'		=> ['type' => API_INT32, 'in' => '1:'.ZBX_MAX_INT32, 'default' => 1],
				'parent'	=> ['type' => API_INT32, 'in' => '0:'.ZBX_MAX_INT32, 'default' => 0],
				'sysmapid'	=> ['type' => API_ID, 'default' => '0']
			]]);
	}

	public function setValue($value): self {
		$this->value = (array) $value;

		return $this;
	}

	public function validate(bool $strict = false): array {
		$errors = parent::validate($strict);

		if (!$errors) {
			$this->setValue(self::validateNavTree($this->getValue(), $errors));
		}

		return $errors;
	}

	public function toApi(array &$widget_fields = []): void {
		$value = $this->getValue();

		foreach ($value as $index => $val) {
			$widget_fields[] = [
				'type' => $this->save_type,
				'name' => $this->name.'.name.'.$index,
				'value' => $val['name']
			];

			// Add default values to avoid check of key existence.
			$val = array_merge([
				'order' => 1,
				'parent' => 0,
				'sysmapid' => 0
			], $val);

			if ($val['order'] != 1) {
				$widget_fields[] = [
					'type' => ZBX_WIDGET_FIELD_TYPE_INT32,
					'name' => $this->name.'.order.'.$index,
					'value' => $val['order']
				];
			}
			if ($val['parent'] != 0) {
				$widget_fields[] = [
					'type' => ZBX_WIDGET_FIELD_TYPE_INT32,
					'name' => $this->name.'.parent.'.$index,
					'value' => $val['parent']
				];
			}
			if ($val['sysmapid'] != 0) {
				$widget_fields[] = [
					'type' => ZBX_WIDGET_FIELD_TYPE_MAP,
					'name' => $this->name.'.sysmapid.'.$index,
					'value' => $val['sysmapid']
				];
			}
		}
	}

	/**
	 * Check and fix the tree of the maps.
	 */
	private static function validateNavTree(array $navtree_items, array &$errors): array {
		// Check for incorrect parent IDs.
		foreach ($navtree_items as $fieldid => &$navtree_item) {
			if ($navtree_item['parent'] != 0 && !array_key_exists($navtree_item['parent'], $navtree_items)) {
				$errors[] = _s('Incorrect value for field "%1$s": %2$s.',
					'navtree.parent.'.$fieldid, _('reference to a non-existent tree element')
				);
				$navtree_item['parent'] = 0;
			}
		}
		unset($navtree_item);

		// Find and fix circular dependencies.
		foreach ($navtree_items as $navtree_item) {
			$parentid = $navtree_item['parent'];
			$parentids = [$parentid => true];

			while ($parentid != 0) {
				if (array_key_exists($navtree_items[$parentid]['parent'], $parentids)) {
					$errors[] = _s('Incorrect value for field "%1$s": %2$s.',
						'navtree.parent.'.$parentid, _('circular dependency is not allowed')
					);
					$navtree_items[$parentid]['parent'] = 0;
				}

				$parentid = $navtree_items[$parentid]['parent'];
			}
		}

		return $navtree_items;
	}
}