<?php

namespace alveolata\xml;

require_once(DIR_ALVEOLATA . '/list/functions.php');
require_once(DIR_ALVEOLATA . '/xml/abstract/interface.php');
require_once(DIR_ALVEOLATA . '/xml/concrete/document/type.php');


/**
 * @author Christian Fraß <frass@greenscale.de>
 */
class implementation_document implements interface_node
{
	
	/**
	 * @var \alveolata\xml\struct_document
	 */
	private $subject;
	
		
	/**
	 */
	public function __construct(
		struct_document $subject
	)
	{
		$this->subject = $subject;
	}
	
	
	/**
	 * @implementation
	 */
	public function find(
		\Closure $sub,
		\Closure $predicate,
		?int $max_depth
	) : array
	{
		return (
			((! \is_null($max_depth)) && ($max_depth <= 0))
			? []
			: \alveolata\list_\reduce(
				\alveolata\list_\map(
					$this->subject->children,
					fn($child) => ($sub)(
						$child,
						$predicate,
						(\is_null($max_depth) ? null : ($max_depth - 1))
					)
				),
				(
					($predicate)($this->subject)
					? [$this->subject]
					: []
				),
				fn($x, $y) => \array_merge($x, $y)
			)
		);
	}
	
	
	/**
	 * @implementation
	 */
	public function transform(
		\Closure $sub,
		\Closure $function
	)
	{
		return ($function)(
			new struct_document(
				(
					\is_null($this->subject->children)
					? null
					: \alveolata\list_\map(
						$this->subject->children,
						fn($child) => ($sub)($child, $function)
					)
				)
			)
		);
	}
	
	
	/**
	 * @implementation
	 */
	public function to_raw(
		\Closure $sub
	)
	{
		return [
			'kind' => 'document',
			'data' => [
				'children' => \alveolata\list_\map(
					$this->subject->children,
					fn($child) => ($sub)($child)
				)
			],
		];
	}
	
	
	/**
	 * @implementation
	 */
	public function to_string(
		\Closure $sub,
		int $depth
	) : string
	{
		return \implode(
			'',
			\alveolata\list_\map(
				$this->subject->children,
				fn($child) => ($sub)($child, ['depth' => ($depth + 1)])
			)
		);
	}
	
}

 ?>