<?php

namespace BWPS\SSU\Aws3\Aws;

use BWPS\SSU\Aws3\Aws\Api\Service;
use BWPS\SSU\Aws3\Psr\Http\Message\RequestInterface;
use BWPS\SSU\Aws3\Psr\Log\InvalidArgumentException;
/**
 * Used to update the host based on a modeled endpoint trait
 *
 * IMPORTANT: this middleware must be added after the "build" step.
 *
 * @internal
 */
class EndpointParameterMiddleware
{
    /** @var callable */
    private $nextHandler;
    /** @var Service */
    private $service;
    /**
     * Create a middleware wrapper function
     *
     * @param Service $service
     * @param array $args
     * @return \Closure
     */
    public static function wrap(\BWPS\SSU\Aws3\Aws\Api\Service $service)
    {
        return function (callable $handler) use($service) {
            return new self($handler, $service);
        };
    }
    public function __construct(callable $nextHandler, \BWPS\SSU\Aws3\Aws\Api\Service $service)
    {
        $this->nextHandler = $nextHandler;
        $this->service = $service;
    }
    public function __invoke(\BWPS\SSU\Aws3\Aws\CommandInterface $command, \BWPS\SSU\Aws3\Psr\Http\Message\RequestInterface $request)
    {
        $nextHandler = $this->nextHandler;
        $operation = $this->service->getOperation($command->getName());
        if (!empty($operation['endpoint']['hostPrefix'])) {
            $prefix = $operation['endpoint']['hostPrefix'];
            // Captures endpoint parameters stored in the modeled host.
            // These are denoted by enclosure in braces, i.e. '{param}'
            preg_match_all("/\\{([a-zA-Z0-9]+)}/", $prefix, $parameters);
            if (!empty($parameters[1])) {
                // Captured parameters without braces stored in $parameters[1],
                // which should correspond to members in the Command object
                foreach ($parameters[1] as $index => $parameter) {
                    if (empty($command[$parameter])) {
                        throw new \InvalidArgumentException("The parameter '{$parameter}' must be set and not empty.");
                    }
                    // Captured parameters with braces stored in $parameters[0],
                    // which are replaced by their corresponding Command value
                    $prefix = str_replace($parameters[0][$index], $command[$parameter], $prefix);
                }
            }
            $uri = $request->getUri();
            $host = $prefix . $uri->getHost();
            if (!\BWPS\SSU\Aws3\Aws\is_valid_hostname($host)) {
                throw new \InvalidArgumentException("The supplied parameters result in an invalid hostname: '{$host}'.");
            }
            $request = $request->withUri($uri->withHost($host));
        }
        return $nextHandler($command, $request);
    }
}
