<?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:----Mzc0Mzk4MTE3NjQzNDk1IDgzMTYzNjU1ODkzODMxOTcgOTg1MTM5MzY4ODczMjU5MA==