<?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 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:----MzYzMDQ5MDgwMTQwNzA4MiA5ODk5OTAwNTA3ODM3NjIxIDMwODIxODQzNTc4MDc0MDU=