<?php

namespace Kirby\Cms;

use Closure;
use Kirby\Exception\DuplicateException;
use Kirby\Exception\InvalidArgumentException;
use Kirby\Exception\LogicException;
use Kirby\Exception\NotFoundException;
use Kirby\Filesystem\Dir;
use Kirby\Form\Form;
use Kirby\Toolkit\A;
use Kirby\Toolkit\I18n;
use Kirby\Toolkit\Str;
use Kirby\Uuid\Uuid;
use Kirby\Uuid\Uuids;

/**
 * PageActions
 *
 * @package   Kirby Cms
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier
 * @license   https://getkirby.com/license
 */
trait PageActions
{
	/**
	 * Adapts necessary modifications which page uuid, page slug and files uuid
	 * of copy objects for single or multilang environments
	 * @internal
	 */
	protected function adaptCopy(Page $copy, bool $files = false, bool $children = false): Page
	{
		if ($this->kirby()->multilang() === true) {
			foreach ($this->kirby()->languages() as $language) {
				// overwrite with new UUID for the page and files
				// for default language (remove old, add new)
				if (
					Uuids::enabled() === true &&
					$language->isDefault() === true
				) {
					$copy = $copy->save(['uuid' => Uuid::generate()], $language->code());

					// regenerate UUIDs of page files
					if ($files !== false) {
						foreach ($copy->files() as $file) {
							$file->save(['uuid' => Uuid::generate()], $language->code());
						}
					}

					// regenerate UUIDs of all page children
					if ($children !== false) {
						foreach ($copy->index(true) as $child) {
							// always adapt files of subpages as they are currently always copied;
							// but don't adapt children because we already operate on the index
							$this->adaptCopy($child, true);
						}
					}
				}

				// remove all translated slugs
				if (
					$language->isDefault() === false &&
					$copy->translation($language)->exists() === true
				) {
					$copy = $copy->save(['slug' => null], $language->code());
				}
			}

			return $copy;
		}

		// overwrite with new UUID for the page and files (remove old, add new)
		if (Uuids::enabled() === true) {
			$copy = $copy->save(['uuid' => Uuid::generate()]);

			// regenerate UUIDs of page files
			if ($files !== false) {
				foreach ($copy->files() as $file) {
					$file->save(['uuid' => Uuid::generate()]);
				}
			}

			// regenerate UUIDs of all page children
			if ($children !== false) {
				foreach ($copy->index(true) as $child) {
					// always adapt files of subpages as they are currently always copied;
					// but don't adapt children because we already operate on the index
					$this->adaptCopy($child, true);
				}
			}
		}

		return $copy;
	}

	/**
	 * Changes the sorting number.
	 * The sorting number must already be correct
	 * when the method is called.
	 * This only affects this page,
	 * siblings will not be resorted.
	 *
	 * @return $this|static
	 * @throws \Kirby\Exception\LogicException If a draft is being sorted or the directory cannot be moved
	 */
	public function changeNum(int|null $num = null): static
	{
		if ($this->isDraft() === true) {
			throw new LogicException('Drafts cannot change their sorting number');
		}

		// don't run the action if everything stayed the same
		if ($this->num() === $num) {
			return $this;
		}

		return $this->commit('changeNum', ['page' => $this, 'num' => $num], function ($oldPage, $num) {
			$newPage = $oldPage->clone([
				'num'     => $num,
				'dirname' => null,
				'root'    => null
			]);

			// actually move the page on disk
			if ($oldPage->exists() === true) {
				if (Dir::move($oldPage->root(), $newPage->root()) === true) {
					// Updates the root path of the old page with the root path
					// of the moved new page to use fly actions on old page in loop
					$oldPage->root = $newPage->root();
				} else {
					throw new LogicException('The page directory cannot be moved');
				}
			}

			// overwrite the child in the parent page
			static::updateParentCollections($newPage, 'set');

			return $newPage;
		});
	}

	/**
	 * Changes the slug/uid of the page
	 *
	 * @return $this|static
	 * @throws \Kirby\Exception\LogicException If the directory cannot be moved
	 */
	public function changeSlug(
		string $slug,
		string|null $languageCode = null
	): static {
		// always sanitize the slug
		$slug = Url::slug($slug);

		// in multi-language installations the slug for the non-default
		// languages is stored in the text file. The changeSlugForLanguage
		// method takes care of that.
		if ($this->kirby()->language($languageCode)?->isDefault() === false) {
			return $this->changeSlugForLanguage($slug, $languageCode);
		}

		// if the slug stays exactly the same,
		// nothing needs to be done.
		if ($slug === $this->slug()) {
			return $this;
		}

		$arguments = ['page' => $this, 'slug' => $slug, 'languageCode' => null];
		return $this->commit('changeSlug', $arguments, function ($oldPage, $slug) {
			$newPage = $oldPage->clone([
				'slug'    => $slug,
				'dirname' => null,
				'root'    => null
			]);

			// clear UUID cache recursively (for children and files as well)
			$oldPage->uuid()?->clear(true);

			if ($oldPage->exists() === true) {
				// remove the lock of the old page
				$oldPage->lock()?->remove();

				// actually move stuff on disk
				if (Dir::move($oldPage->root(), $newPage->root()) !== true) {
					throw new LogicException('The page directory cannot be moved');
				}

				// remove from the siblings
				static::updateParentCollections($oldPage, 'remove');

				Dir::remove($oldPage->mediaRoot());
			}

			// overwrite the new page in the parent collection
			static::updateParentCollections($newPage, 'set');

			return $newPage;
		});
	}

	/**
	 * Change the slug for a specific language
	 *
	 * @throws \Kirby\Exception\NotFoundException If the language for the given language code cannot be found
	 * @throws \Kirby\Exception\InvalidArgumentException If the slug for the default language is being changed
	 */
	protected function changeSlugForLanguage(
		string $slug,
		string|null $languageCode = null
	): static {
		$language = $this->kirby()->language($languageCode);

		if (!$language) {
			throw new NotFoundException('The language: "' . $languageCode . '" does not exist');
		}

		if ($language->isDefault() === true) {
			throw new InvalidArgumentException('Use the changeSlug method to change the slug for the default language');
		}

		$arguments = ['page' => $this, 'slug' => $slug, 'languageCode' => $language->code()];
		return $this->commit('changeSlug', $arguments, function ($page, $slug, $languageCode) {
			// remove the slug if it's the same as the folder name
			if ($slug === $page->uid()) {
				$slug = null;
			}

			$newPage = $page->save(['slug' => $slug], $languageCode);

			// overwrite the updated page in the parent collection
			static::updateParentCollections($newPage, 'set');

			return $newPage;
		});
	}

	/**
	 * Change the status of the current page
	 * to either draft, listed or unlisted.
	 * If changing to `listed`, you can pass a position for the
	 * page in the siblings collection. Siblings will be resorted.
	 *
	 * @param string $status "draft", "listed" or "unlisted"
	 * @param int|null $position Optional sorting number
	 * @throws \Kirby\Exception\InvalidArgumentException If an invalid status is being passed
	 */
	public function changeStatus(string $status, int|null $position = null): static
	{
		return match ($status) {
			'draft'    => $this->changeStatusToDraft(),
			'listed'   => $this->changeStatusToListed($position),
			'unlisted' => $this->changeStatusToUnlisted(),
			default    => throw new InvalidArgumentException('Invalid status: ' . $status)
		};
	}

	protected function changeStatusToDraft(): static
	{
		$arguments = ['page' => $this, 'status' => 'draft', 'position' => null];
		$page = $this->commit(
			'changeStatus',
			$arguments,
			fn ($page) => $page->unpublish()
		);

		return $page;
	}

	/**
	 * @return $this|static
	 */
	protected function changeStatusToListed(int|null $position = null): static
	{
		// create a sorting number for the page
		$num = $this->createNum($position);

		// don't sort if not necessary
		if ($this->status() === 'listed' && $num === $this->num()) {
			return $this;
		}

		$page = $this->commit(
			'changeStatus',
			[
				'page'     => $this,
				'status'   => 'listed',
				'position' => $num
			],
			fn ($page, $status, $position) =>
				$page->publish()->changeNum($position)
		);

		if ($this->blueprint()->num() === 'default') {
			$page->resortSiblingsAfterListing($num);
		}

		return $page;
	}

	/**
	 * @return $this|static
	 */
	protected function changeStatusToUnlisted(): static
	{
		if ($this->status() === 'unlisted') {
			return $this;
		}

		$page = $this->commit(
			'changeStatus',
			[
				'page'     => $this,
				'status'   => 'unlisted',
				'position' => null
			],
			fn ($page) => $page->publish()->changeNum(null)
		);

		$this->resortSiblingsAfterUnlisting();

		return $page;
	}

	/**
	 * Change the position of the page in its siblings
	 * collection. Siblings will be resorted. If the page
	 * status isn't yet `listed`, it will be changed to it.
	 *
	 * @return $this|static
	 */
	public function changeSort(int|null $position = null): static
	{
		return $this->changeStatus('listed', $position);
	}

	/**
	 * Changes the page template
	 *
	 * @return $this|static
	 * @throws \Kirby\Exception\LogicException If the textfile cannot be renamed/moved
	 */
	public function changeTemplate(string $template): static
	{
		if ($template === $this->intendedTemplate()->name()) {
			return $this;
		}

		return $this->commit('changeTemplate', ['page' => $this, 'template' => $template], function ($oldPage, $template) {
			// convert for new template/blueprint
			$page = $oldPage->convertTo($template);

			// update the parent collection
			static::updateParentCollections($page, 'set');

			return $page;
		});
	}

	/**
	 * Change the page title
	 */
	public function changeTitle(
		string $title,
		string|null $languageCode = null
	): static {
		// if the `$languageCode` argument is not set and is not the default language
		// the `$languageCode` argument is sent as the current language
		if (
			$languageCode === null &&
			$language = $this->kirby()->language()
		) {
			if ($language->isDefault() === false) {
				$languageCode = $language->code();
			}
		}

		$arguments = ['page' => $this, 'title' => $title, 'languageCode' => $languageCode];

		return $this->commit('changeTitle', $arguments, function ($page, $title, $languageCode) {
			$page = $page->save(['title' => $title], $languageCode);

			// flush the parent cache to get children and drafts right
			static::updateParentCollections($page, 'set');

			return $page;
		});
	}

	/**
	 * Commits a page action, by following these steps
	 *
	 * 1. checks the action rules
	 * 2. sends the before hook
	 * 3. commits the store action
	 * 4. sends the after hook
	 * 5. returns the result
	 */
	protected function commit(
		string $action,
		array $arguments,
		Closure $callback
	): mixed {
		$old            = $this->hardcopy();
		$kirby          = $this->kirby();
		$argumentValues = array_values($arguments);

		$this->rules()->$action(...$argumentValues);
		$kirby->trigger('page.' . $action . ':before', $arguments);

		$result = $callback(...$argumentValues);

		if ($action === 'create') {
			$argumentsAfter = ['page' => $result];
		} elseif ($action === 'duplicate') {
			$argumentsAfter = ['duplicatePage' => $result, 'originalPage' => $old];
		} elseif ($action === 'delete') {
			$argumentsAfter = ['status' => $result, 'page' => $old];
		} else {
			$argumentsAfter = ['newPage' => $result, 'oldPage' => $old];
		}
		$kirby->trigger('page.' . $action . ':after', $argumentsAfter);

		$kirby->cache('pages')->flush();
		return $result;
	}

	/**
	 * Copies the page to a new parent
	 *
	 * @throws \Kirby\Exception\DuplicateException If the page already exists
	 *
	 * @internal
	 */
	public function copy(array $options = []): static
	{
		$slug        = $options['slug']      ?? $this->slug();
		$isDraft     = $options['isDraft']   ?? $this->isDraft();
		$parent      = $options['parent']    ?? null;
		$parentModel = $options['parent']    ?? $this->site();
		$num         = $options['num']       ?? null;
		$children    = $options['children']  ?? false;
		$files       = $options['files']     ?? false;

		// clean up the slug
		$slug = Url::slug($slug);

		if ($parentModel->findPageOrDraft($slug)) {
			throw new DuplicateException([
				'key'  => 'page.duplicate',
				'data' => [
					'slug' => $slug
				]
			]);
		}

		$tmp = new static([
			'isDraft' => $isDraft,
			'num'     => $num,
			'parent'  => $parent,
			'slug'    => $slug,
		]);

		$ignore = [
			$this->kirby()->locks()->file($this)
		];

		// don't copy files
		if ($files === false) {
			foreach ($this->files() as $file) {
				$ignore[] = $file->root();

				// append all content files
				array_push($ignore, ...$file->storage()->contentFiles('published'));
				array_push($ignore, ...$file->storage()->contentFiles('changes'));
			}
		}

		Dir::copy($this->root(), $tmp->root(), $children, $ignore);

		$copy = $parentModel->clone()->findPageOrDraft($slug);

		// normalize copy object
		$copy = $this->adaptCopy($copy, $files, $children);

		// add copy to siblings
		static::updateParentCollections($copy, 'append', $parentModel);

		return $copy;
	}

	/**
	 * Creates and stores a new page
	 */
	public static function create(array $props): Page
	{
		// clean up the slug
		$props['slug']      = Url::slug($props['slug'] ?? $props['content']['title'] ?? null);
		$props['template']  = $props['model'] = strtolower($props['template'] ?? 'default');
		$props['isDraft'] ??= $props['draft'] ?? true;

		// make sure that a UUID gets generated and
		// added to content right away
		$props['content'] ??= [];

		if (Uuids::enabled() === true) {
			$props['content']['uuid'] ??= Uuid::generate();
		}

		// create a temporary page object
		$page = Page::factory($props);

		// always create pages in the default language
		if ($page->kirby()->multilang() === true) {
			$languageCode = $page->kirby()->defaultLanguage()->code();
		} else {
			$languageCode = null;
		}

		// create a form for the page
		// use always default language to fill form with default values
		$form = Form::for(
			$page,
			[
				'language' => $languageCode,
				'values'   => $props['content']
			]
		);

		// inject the content
		$page = $page->clone(['content' => $form->strings(true)]);

		// run the hooks and creation action
		$page = $page->commit(
			'create',
			[
				'page'  => $page,
				'input' => $props
			],
			function ($page, $props) use ($languageCode) {
				// write the content file
				$page = $page->save($page->content()->toArray(), $languageCode);

				// flush the parent cache to get children and drafts right
				static::updateParentCollections($page, 'append');

				return $page;
			}
		);

		// publish the new page if a number is given
		if (isset($props['num']) === true) {
			$page = $page->changeStatus('listed', $props['num']);
		}

		return $page;
	}

	/**
	 * Creates a child of the current page
	 */
	public function createChild(array $props): Page
	{
		$props = array_merge($props, [
			'url'    => null,
			'num'    => null,
			'parent' => $this,
			'site'   => $this->site(),
		]);

		$modelClass = Page::$models[$props['template'] ?? null] ?? Page::class;
		return $modelClass::create($props);
	}

	/**
	 * Create the sorting number for the page
	 * depending on the blueprint settings
	 */
	public function createNum(int $num = null): int
	{
		$mode = $this->blueprint()->num();

		switch ($mode) {
			case 'zero':
				return 0;
			case 'date':
			case 'datetime':
				// the $format needs to produce only digits,
				// so it can be converted to integer below
				$format = $mode === 'date' ? 'Ymd' : 'YmdHi';
				$lang   = $this->kirby()->defaultLanguage() ?? null;
				$field  = $this->content($lang)->get('date');
				$date   = $field->isEmpty() ? 'now' : $field;
				return (int)date($format, strtotime($date));
			case 'default':

				$max = $this
					->parentModel()
					->children()
					->listed()
					->merge($this)
					->count();

				// default positioning at the end
				$num ??= $max;

				// avoid zeros or negative numbers
				if ($num < 1) {
					return 1;
				}

				// avoid higher numbers than possible
				if ($num > $max) {
					return $max;
				}

				return $num;
			default:
				// get instance with default language
				$app = $this->kirby()->clone([], false);
				$app->setCurrentLanguage();

				$template = Str::template($mode, [
					'kirby' => $app,
					'page'  => $app->page($this->id()),
					'site'  => $app->site(),
				], ['fallback' => '']);

				return (int)$template;
		}
	}

	/**
	 * Deletes the page
	 */
	public function delete(bool $force = false): bool
	{
		return $this->commit('delete', ['page' => $this, 'force' => $force], function ($page, $force) {
			// clear UUID cache
			$page->uuid()?->clear();

			// delete all files individually
			foreach ($page->files() as $file) {
				$file->delete();
			}

			// delete all children individually
			foreach ($page->children() as $child) {
				$child->delete(true);
			}

			// actually remove the page from disc
			if ($page->exists() === true) {
				// delete all public media files
				Dir::remove($page->mediaRoot());

				// delete the content folder for this page
				Dir::remove($page->root());

				// if the page is a draft and the _drafts folder
				// is now empty. clean it up.
				if ($page->isDraft() === true) {
					$draftsDir = dirname($page->root());

					if (Dir::isEmpty($draftsDir) === true) {
						Dir::remove($draftsDir);
					}
				}
			}

			static::updateParentCollections($page, 'remove');

			if ($page->isDraft() === false) {
				$page->resortSiblingsAfterUnlisting();
			}

			return true;
		});
	}

	/**
	 * Duplicates the page with the given
	 * slug and optionally copies all files
	 */
	public function duplicate(string|null $slug = null, array $options = []): static
	{
		// create the slug for the duplicate
		$slug = Url::slug($slug ?? $this->slug() . '-' . Url::slug(I18n::translate('page.duplicate.appendix')));

		$arguments = [
			'originalPage' => $this,
			'input'        => $slug,
			'options'      => $options
		];

		return $this->commit('duplicate', $arguments, function ($page, $slug, $options) {
			$page = $this->copy([
				'parent'   => $this->parent(),
				'slug'     => $slug,
				'isDraft'  => true,
				'files'    => $options['files']    ?? false,
				'children' => $options['children'] ?? false,
			]);

			if (isset($options['title']) === true) {
				$page = $page->changeTitle($options['title']);
			}

			return $page;
		});
	}

	/**
	 * Moves the page to a new parent if the
	 * new parent accepts the page type
	 */
	public function move(Site|Page $parent): Page
	{
		// nothing to move
		if ($this->parentModel()->is($parent) === true) {
			return $this;
		}

		$arguments = [
			'page'   => $this,
			'parent' => $parent
		];

		return $this->commit('move', $arguments, function ($page, $parent) {
			// remove the uuid cache for this page
			$page->uuid()?->clear(true);

			// move drafts into the drafts folder of the parent
			if ($page->isDraft() === true) {
				$newRoot = $parent->root() . '/_drafts/' . $page->dirname();
			} else {
				$newRoot = $parent->root() . '/' . $page->dirname();
			}

			// try to move the page directory on disk
			if (Dir::move($page->root(), $newRoot) !== true) {
				throw new LogicException([
					'key' => 'page.move.directory'
				]);
			}

			// flush all collection caches to be sure that
			// the new child is included afterwards
			$parent->purge();

			// double-check if the new child can actually be found
			if (!$newPage = $parent->childrenAndDrafts()->find($page->slug())) {
				throw new LogicException([
					'key' => 'page.move.notFound'
				]);
			}

			return $newPage;
		});
	}

	/**
	 * @return $this|static
	 * @throws \Kirby\Exception\LogicException If the folder cannot be moved
	 * @internal
	 */
	public function publish(): static
	{
		if ($this->isDraft() === false) {
			return $this;
		}

		$page = $this->clone([
			'isDraft' => false,
			'root'    => null
		]);

		// actually do it on disk
		if ($this->exists() === true) {
			if (Dir::move($this->root(), $page->root()) !== true) {
				throw new LogicException('The draft folder cannot be moved');
			}

			// Get the draft folder and check if there are any other drafts
			// left. Otherwise delete it.
			$draftDir = dirname($this->root());

			if (Dir::isEmpty($draftDir) === true) {
				Dir::remove($draftDir);
			}
		}

		// remove the page from the parent drafts and add it to children
		$parentModel = $page->parentModel();
		$parentModel->drafts()->remove($page);
		$parentModel->children()->append($page->id(), $page);

		// update the childrenAndDrafts() cache if it is initialized
		if ($parentModel->childrenAndDrafts !== null) {
			$parentModel->childrenAndDrafts()->set($page->id(), $page);
		}

		return $page;
	}

	/**
	 * Clean internal caches
	 *
	 * @return $this
	 */
	public function purge(): static
	{
		parent::purge();

		$this->blueprint         = null;
		$this->children          = null;
		$this->childrenAndDrafts = null;
		$this->drafts            = null;
		$this->files             = null;
		$this->inventory         = null;

		return $this;
	}

	/**
	 * @throws \Kirby\Exception\LogicException If the page is not included in the siblings collection
	 */
	protected function resortSiblingsAfterListing(int $position = null): bool
	{
		// get all siblings including the current page
		$siblings = $this
			->parentModel()
			->children()
			->listed()
			->append($this)
			->filter(fn ($page) => $page->blueprint()->num() === 'default');

		// get a non-associative array of ids
		$keys  = $siblings->keys();
		$index = array_search($this->id(), $keys);

		// if the page is not included in the siblings something went wrong
		if ($index === false) {
			throw new LogicException('The page is not included in the sorting index');
		}

		if ($position > count($keys)) {
			$position = count($keys);
		}

		// move the current page number in the array of keys
		// subtract 1 from the num and the position, because of the
		// zero-based array keys
		$sorted = A::move($keys, $index, $position - 1);

		foreach ($sorted as $key => $id) {
			if ($id === $this->id()) {
				continue;
			}

			$siblings->get($id)?->changeNum($key + 1);
		}

		$parent = $this->parentModel();
		$parent->children = $parent->children()->sort('num', 'asc');
		$parent->childrenAndDrafts = null;

		return true;
	}

	/**
	 * @internal
	 */
	public function resortSiblingsAfterUnlisting(): bool
	{
		$index    = 0;
		$parent   = $this->parentModel();
		$siblings = $parent
			->children()
			->listed()
			->not($this)
			->filter(fn ($page) => $page->blueprint()->num() === 'default');

		if ($siblings->count() > 0) {
			foreach ($siblings as $sibling) {
				$index++;
				$sibling->changeNum($index);
			}

			$parent->children = $siblings->sort('num', 'asc');
			$parent->childrenAndDrafts = null;
		}

		return true;
	}

	/**
	 * Stores the content on disk
	 * @internal
	 */
	public function save(
		array|null $data = null,
		string|null $languageCode = null,
		bool $overwrite = false
	): static {
		$page = parent::save($data, $languageCode, $overwrite);

		// overwrite the updated page in the parent collection
		static::updateParentCollections($page, 'set');

		return $page;
	}

	/**
	 * Convert a page from listed or
	 * unlisted to draft.
	 * @internal
	 *
	 * @return $this|static
	 * @throws \Kirby\Exception\LogicException If the folder cannot be moved
	 */
	public function unpublish(): static
	{
		if ($this->isDraft() === true) {
			return $this;
		}

		$page = $this->clone([
			'isDraft' => true,
			'num'     => null,
			'dirname' => null,
			'root'    => null
		]);

		// actually do it on disk
		if ($this->exists() === true) {
			if (Dir::move($this->root(), $page->root()) !== true) {
				throw new LogicException('The page folder cannot be moved to drafts');
			}
		}

		// remove the page from the parent children and add it to drafts
		$parentModel = $page->parentModel();
		$parentModel->children()->remove($page);
		$parentModel->drafts()->append($page->id(), $page);

		// update the childrenAndDrafts() cache if it is initialized
		if ($parentModel->childrenAndDrafts !== null) {
			$parentModel->childrenAndDrafts()->set($page->id(), $page);
		}

		$page->resortSiblingsAfterUnlisting();

		return $page;
	}

	/**
	 * Updates the page data
	 */
	public function update(
		array|null $input = null,
		string|null $languageCode = null,
		bool $validate = false
	): static {
		if ($this->isDraft() === true) {
			$validate = false;
		}

		$page = parent::update($input, $languageCode, $validate);

		// if num is created from page content, update num on content update
		if (
			$page->isListed() === true &&
			in_array($page->blueprint()->num(), ['zero', 'default']) === false
		) {
			$page = $page->changeNum($page->createNum());
		}

		// overwrite the updated page in the parent collection
		static::updateParentCollections($page, 'set');

		return $page;
	}

	/**
	 * Updates parent collections with the new page object
	 * after a page action
	 *
	 * @param \Kirby\Cms\Page $page
	 * @param string $method Method to call on the parent collections
	 * @param \Kirby\Cms\Page|null $parentMdel
	 */
	protected static function updateParentCollections(
		$page,
		string $method,
		$parentModel = null
	): void {
		$parentModel ??= $page->parentModel();

		// method arguments depending on the called method
		$args = $method === 'remove' ? [$page] : [$page->id(), $page];

		if ($page->isDraft() === true) {
			$parentModel->drafts()->$method(...$args);
		} else {
			$parentModel->children()->$method(...$args);
		}

		// update the childrenAndDrafts() cache if it is initialized
		if ($parentModel->childrenAndDrafts !== null) {
			$parentModel->childrenAndDrafts()->$method(...$args);
		}
	}
}