<?php

namespace AmpProject\Optimizer\Exception;

use InvalidArgumentException;

/**
 * Exception thrown when an unknown configuration key was requested.
 *
 * @package ampproject/amp-toolbox
 */
final class UnknownConfigurationKey extends InvalidArgumentException implements AmpOptimizerException
{

    /**
     * Instantiate an UnknownConfigurationKey exception for an unknown key.
     *
     * @param string $key Key that was unknown.
     * @return self
     */
    public static function fromKey($key)
    {
        $message = "The configuration does not contain the requested key '{$key}'.";

        return new self($message);
    }

    /**
     * Instantiate an UnknownConfigurationKey exception for an unknown transformer configuration key.
     *
     * @param string $transformer Transformer class or identifier.
     * @param string $key         Key that was unknown.
     * @return self
     */
    public static function fromTransformerKey($transformer, $key)
    {
        $parts       = explode('\\', $transformer);
        $transformer = array_pop($parts);
        $message     = "The configuration of the transformer '{$transformer}' does not contain "
                       . "the requested key '{$key}'.";

        return new self($message);
    }
}