<?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:----Mjk4MzEzNTYxMDUwMTE0MSA4ODc1ODE2NzAzMTg2MTggODU4NzA5MDc2NDUzMDg5Mg==