<?php
/**
 * @package    Joomla.Component.Builder
 *
 * @created    4th September, 2022
 * @author     Llewellyn van der Merwe <https://dev.vdm.io>
 * @git        Joomla Component Builder <https://git.vdm.dev/joomla/Component-Builder>
 * @copyright  Copyright (C) 2015 Vast Development Method. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace VDM\Joomla\Componentbuilder\Compiler;


use VDM\Joomla\Componentbuilder\Compiler\Utilities\Indent;
use VDM\Joomla\Componentbuilder\Abstraction\BaseRegistry;


/**
 * Compiler Registry
 * 
 * @since 3.2.0
 */
class Registry extends BaseRegistry
{
	/**
	 * Default indentation value
	 *
	 * @var    int
	 * @since  1.0
	 */
	protected $indent = 2;

	/**
	 * Method to export a set of values to a PHP array
	 *
	 * @param   string  $path      Registry path (e.g. joomla.content.showauthor)
	 * @param   int     $default   The default indentation
	 *
	 * @return  ?string    The var set being exported as a PHP array
	 *
	 * @since   3.4.0
	 */
	public function varExport(string $path, int $default = 2): ?string
	{
		// check if we have data
		if (($data = $this->extract($path)) !== null)
		{
			// set the default indentation value
			$this->indent = $default;

			// convert to array
			$data = $data->toArray();

			// convert to string
			$data = var_export($data, true);

			// replace all space with system indentation
			$data = preg_replace_callback("/^(\s{2})(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(\s{2})?(.*)/m", [$this, 'convertIndent'], $data);

			// convert all array to []
			$array = preg_split("/\r\n|\n|\r/", $data);
			$array = preg_replace(["/\s*array\s\($/", "/\)(,)?$/", "/\s=>\s$/"], [NULL, ']$1', ' => ['], $array);
			$data = implode(PHP_EOL, array_filter(["["] + $array));

			// add needed indentation to the last ]
			$data = preg_replace("/^(\])/m", Indent::_($default) . '$1', $data);

			return $data;
		}
		return null;
	}

	/**
	 * Method to convert found of grouped spaces to system indentation
	 *
	 * @param   array  $matches  The regex array of matching values
	 *
	 * @return  string  The resulting string.
	 *
	 * @since   3.4.0
	 */
	protected function convertIndent(array $matches): string
	{
		// set number to indent by default
		$indent = Indent::_($this->indent);

		// update each found space (group) with one indentation
		foreach (range(1, 11) as $space)
		{
			if (strlen((string) $matches[$space]) > 0)
			{
				$indent .= Indent::_(1);
			}
		}

		return $indent . $matches[12];
	}

}