<?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:----MzIwMDE2OTgzNzIwOTE3NyAxMTc3ODQwNTIwMjg1OTYgMTY4MTU1NDgxMTM3MzYwMg==