<?php
namespace Aws\Api\Parser;

use Aws\Api\Service;
use Aws\Api\StructureShape;
use Aws\Result;
use Aws\CommandInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;

/**
 * @internal Parses query (XML) responses (e.g., EC2, SQS, and many others)
 */
class QueryParser extends AbstractParser
{
    use PayloadParserTrait;

    /** @var bool */
    private $honorResultWrapper;

    /**
     * @param Service   $api                Service description
     * @param XmlParser $xmlParser          Optional XML parser
     * @param bool      $honorResultWrapper Set to false to disable the peeling
     *                                      back of result wrappers from the
     *                                      output structure.
     */
    public function __construct(
        Service $api,
        ?XmlParser $xmlParser = null,
        $honorResultWrapper = true
    ) {
        parent::__construct($api);
        $this->parser = $xmlParser ?: new XmlParser();
        $this->honorResultWrapper = $honorResultWrapper;
    }

    public function __invoke(
        CommandInterface $command,
        ResponseInterface $response
    ) {
        $output = $this->api->getOperation($command->getName())->getOutput();
        $body = $response->getBody();
        $xml = !$body->isSeekable() || $body->getSize()
            ? $this->parseXml($body, $response)
            : null;

        // Empty request bodies should not be deserialized.
        if (is_null($xml)) {
            return new Result();
        }

        if ($this->honorResultWrapper && $output['resultWrapper']) {
            $xml = $xml->{$output['resultWrapper']};
        }

        return new Result($this->parser->parse($output, $xml));
    }

    public function parseMemberFromStream(
        StreamInterface $stream,
        StructureShape $member,
        $response
    ) {
        $xml = $this->parseXml($stream, $response);
        return $this->parser->parse($member, $xml);
    }
}