<?php

namespace WPFitter\Aws;

use WPFitter\Aws\Api\Service;
/**
 * Validates the required input parameters of commands are non empty
 *
 * @internal
 */
class InputValidationMiddleware
{
    /** @var callable */
    private $nextHandler;
    /** @var array */
    private $mandatoryAttributeList;
    /** @var Service */
    private $service;
    /**
     * Create a middleware wrapper function.
     *
     * @param Service $service
     * @param array $mandatoryAttributeList
     * @return callable     */
    public static function wrap(Service $service, $mandatoryAttributeList)
    {
        if (!\is_array($mandatoryAttributeList) || \array_filter($mandatoryAttributeList, 'is_string') !== $mandatoryAttributeList) {
            throw new \InvalidArgumentException("The mandatory attribute list must be an array of strings");
        }
        return function (callable $handler) use($service, $mandatoryAttributeList) {
            return new self($handler, $service, $mandatoryAttributeList);
        };
    }
    public function __construct(callable $nextHandler, Service $service, $mandatoryAttributeList)
    {
        $this->service = $service;
        $this->nextHandler = $nextHandler;
        $this->mandatoryAttributeList = $mandatoryAttributeList;
    }
    public function __invoke(CommandInterface $cmd)
    {
        $nextHandler = $this->nextHandler;
        $op = $this->service->getOperation($cmd->getName())->toArray();
        if (!empty($op['input']['shape'])) {
            $service = $this->service->toArray();
            if (!empty($input = $service['shapes'][$op['input']['shape']])) {
                if (!empty($input['required'])) {
                    foreach ($input['required'] as $key => $member) {
                        if (\in_array($member, $this->mandatoryAttributeList)) {
                            $argument = \is_string($cmd[$member]) ? \trim($cmd[$member]) : $cmd[$member];
                            if ($argument === '' || $argument === null) {
                                $commandName = $cmd->getName();
                                throw new \InvalidArgumentException("The {$commandName} operation requires non-empty parameter: {$member}");
                            }
                        }
                    }
                }
            }
        }
        return $nextHandler($cmd);
    }
}
