<?php
/**
 * Iterator for arrays requiring filtered values
 */

namespace WpOrg\Requests\Utility;

use ArrayIterator;
use ReturnTypeWillChange;
use WpOrg\Requests\Exception\InvalidArgument;

/**
 * Iterator for arrays requiring filtered values
 */
final class FilteredIterator extends ArrayIterator
{
    /**
     * Callback to run as a filter
     *
     * @var callable
     */
    private $callback;

    /**
     * Create a new iterator
     *
     * @param  array  $data
     * @param  callable  $callback  Callback to be called on each value
     *
     * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data argument is not iterable.
     */
    public function __construct($data, $callback)
    {
        if (InputValidator::is_iterable($data) === false) {
            throw InvalidArgument::create(1, '$data', 'iterable', gettype($data));
        }

        parent::__construct($data);

        if (is_callable($callback)) {
            $this->callback = $callback;
        }
    }

    /**
     * {@inheritdoc}
     *
     * @phpcs:disable PHPCompatibility.FunctionNameRestrictions.NewMagicMethods.__unserializeFound
     */
    #[ReturnTypeWillChange]
    public function __unserialize($data) {}
    // phpcs:enable

    public function __wakeup()
    {
        unset($this->callback);
    }

    /**
     * Get the current item's value after filtering
     *
     * @return string
     */
    #[ReturnTypeWillChange]
    public function current()
    {
        $value = parent::current();

        if (is_callable($this->callback)) {
            $value = call_user_func($this->callback, $value);
        }

        return $value;
    }

    /**
     * {@inheritdoc}
     */
    #[ReturnTypeWillChange]
    public function unserialize($data) {}
}
