<?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:----MjA5MTM0MTY5NzIxMDUyMiAzODQwMzU3ODY5MTQxOTY1IDQ3MjQ2MDI4NjIxNDkwNDQ=