<?php

namespace Configula\Filter;

use Configula\ConfigValues;
use Configula\Exception\ConfigLoaderException;

/**
 * Extract items from given top-level item and elevate them to the top level
 *
 * @author Casey McLaughlin <caseyamcl@gmail.com>
 */
class ExtractTopLevelItemsFilter
{
	/** @var string */
	private $topLevelItemName;

	/** @var string */
	private $delimiter;


	/**
	 * Extract Top Level Item constructor.
	 *
	 * @param string $topLevelItemName
	 * @param string $delimiter
	 */
	public function __construct(string $topLevelItemName, string $delimiter = '')
	{
		$this->topLevelItemName = $topLevelItemName;
		$this->delimiter = $delimiter;
	}


	/**
	 * Remove top-level item and elevate its children to the top level
	 *
	 * @param  ConfigValues $values
	 * @return ConfigValues
	 */
	public function __invoke(ConfigValues $values): ConfigValues
	{
		$items = $values->getArrayCopy();
		$delimiterParts = $this->delimiter
		    ? array_filter(explode($this->delimiter, $this->topLevelItemName))
		    : [$this->topLevelItemName];

		while ($current = array_shift($delimiterParts)) {
		    $items = $this->elevate($items, $current);
		}

		return new ConfigValues($items);
	}


	/**
	 * @param array $items
	 * @param string $key
	 * @return array
	 */
	private function elevate(array $items, string $key): array
	{
		if (! isset($items[$key]) or ! is_array($items[$key])) {
		    return $items;
		}

		// Elevate all of the sub-items from the array that are children of the prefix to remove
		foreach ($items[$key] as $k => $v) {
		    // If item already exists in root node, throw exception
		    if (isset($items[$k])) {
		        throw new ConfigLoaderException(
		            sprintf(
		                'Name collision (%s) when removing %s.%s from config values',
		                $k,
		                $this->topLevelItemName,
		                $k
		            )
		        );
		    }

		    $items[$k] = $v;
		}

		unset($items[$key]);
		return $items;
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTE3OTg3MzkyNzQ3OTI1MiA2NDkwNDMwNjg2NzU2Mjc5IDIzMTQ5NjEzODU3NzY3OTE=