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<?php

namespace GuzzleHttp\Psr7;

use InvalidArgumentException;

use Psr\Http\Message\ServerRequestInterface;

use Psr\Http\Message\UriInterface;

use Psr\Http\Message\StreamInterface;

use Psr\Http\Message\UploadedFileInterface;

/**

 * Server-side HTTP request

 *

 * Extends the Request definition to add methods for accessing incoming data,

 * specifically server parameters, cookies, matched path parameters, query

 * string arguments, body parameters, and upload file information.

 *

 * "Attributes" are discovered via decomposing the request (and usually

 * specifically the URI path), and typically will be injected by the application.

 *

 * Requests are considered immutable; all methods that might change state are

 * implemented such that they retain the internal state of the current

 * message and return a new instance that contains the changed state.

 */

class ServerRequest extends Request implements ServerRequestInterface

{

    /**

     * @var array

     */

    private $attributes = [];

    /**

     * @var array

     */

    private $cookieParams = [];

    /**

     * @var null|array|object

     */

    private $parsedBody;

    /**

     * @var array

     */

    private $queryParams = [];

    /**

     * @var array

     */

    private $serverParams;

    /**

     * @var array

     */

    private $uploadedFiles = [];

    /**

     * @param string                               $method       HTTP method

     * @param string|UriInterface                  $uri          URI

     * @param array                                $headers      Request headers

     * @param string|null|resource|StreamInterface $body         Request body

     * @param string                               $version      Protocol version

     * @param array                                $serverParams Typically the $_SERVER superglobal

     */

    public function __construct(

        $method,

        $uri,

        array $headers = [],

        $body = null,

        $version = '1.1',

        array $serverParams = []

    ) {

        $this->serverParams = $serverParams;

        parent::__construct($method, $uri, $headers, $body, $version);

    }

    /**

     * Return an UploadedFile instance array.

     *

     * @param array $files A array which respect $_FILES structure

     * @throws InvalidArgumentException for unrecognized values

     * @return array

     */

    public static function normalizeFiles(array $files)

    {

        $normalized = [];

        foreach ($files as $key => $value) {

            if ($value instanceof UploadedFileInterface) {

                $normalized[$key] = $value;

            } elseif (is_array($value) && isset($value['tmp_name'])) {

                $normalized[$key] = self::createUploadedFileFromSpec($value);

            } elseif (is_array($value)) {

                $normalized[$key] = self::normalizeFiles($value);

                continue;

            } else {

                throw new InvalidArgumentException('Invalid value in files specification');

            }

        }

        return $normalized;

    }

    /**

     * Create and return an UploadedFile instance from a $_FILES specification.

     *

     * If the specification represents an array of values, this method will

     * delegate to normalizeNestedFileSpec() and return that return value.

     *

     * @param array $value $_FILES struct

     * @return array|UploadedFileInterface

     */

    private static function createUploadedFileFromSpec(array $value)

    {

        if (is_array($value['tmp_name'])) {

            return self::normalizeNestedFileSpec($value);

        }

        return new UploadedFile(

            $value['tmp_name'],

            (int) $value['size'],

            (int) $value['error'],

            $value['name'],

            $value['type']

        );

    }

    /**

     * Normalize an array of file specifications.

     *

     * Loops through all nested files and returns a normalized array of

     * UploadedFileInterface instances.

     *

     * @param array $files

     * @return UploadedFileInterface[]

     */

    private static function normalizeNestedFileSpec(array $files = [])

    {

        $normalizedFiles = [];

        foreach (array_keys($files['tmp_name']) as $key) {

            $spec = [

                'tmp_name' => $files['tmp_name'][$key],

                'size'     => $files['size'][$key],

                'error'    => $files['error'][$key],

                'name'     => $files['name'][$key],

                'type'     => $files['type'][$key],

            ];

            $normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);

        }

        return $normalizedFiles;

    }

    /**

     * Return a ServerRequest populated with superglobals:

     * $_GET

     * $_POST

     * $_COOKIE

     * $_FILES

     * $_SERVER

     *

     * @return ServerRequestInterface

     */

    public static function fromGlobals()

    {

        $method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';

        $headers = function_exists('getallheaders') ? getallheaders() : [];

        $uri = self::getUriFromGlobals();

        $body = new LazyOpenStream('php://input', 'r+');

        $protocol = isset($_SERVER['SERVER_PROTOCOL']) ? str_replace('HTTP/', '', $_SERVER['SERVER_PROTOCOL']) : '1.1';

        $serverRequest = new ServerRequest($method, $uri, $headers, $body, $protocol, $_SERVER);

        return $serverRequest

            ->withCookieParams($_COOKIE)

            ->withQueryParams($_GET)

            ->withParsedBody($_POST)

            ->withUploadedFiles(self::normalizeFiles($_FILES));

    }

    /**

     * Get a Uri populated with values from $_SERVER.

     *

     * @return UriInterface

     */

    public static function getUriFromGlobals() {

        $uri = new Uri('');

        $uri = $uri->withScheme(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');

        $hasPort = false;

        if (isset($_SERVER['HTTP_HOST'])) {

            $hostHeaderParts = explode(':', $_SERVER['HTTP_HOST']);

            $uri = $uri->withHost($hostHeaderParts[0]);

            if (isset($hostHeaderParts[1])) {

                $hasPort = true;

                $uri = $uri->withPort($hostHeaderParts[1]);

            }

        } elseif (isset($_SERVER['SERVER_NAME'])) {

            $uri = $uri->withHost($_SERVER['SERVER_NAME']);

        } elseif (isset($_SERVER['SERVER_ADDR'])) {

            $uri = $uri->withHost($_SERVER['SERVER_ADDR']);

        }

        if (!$hasPort && isset($_SERVER['SERVER_PORT'])) {

            $uri = $uri->withPort($_SERVER['SERVER_PORT']);

        }

        $hasQuery = false;

        if (isset($_SERVER['REQUEST_URI'])) {

            $requestUriParts = explode('?', $_SERVER['REQUEST_URI']);

            $uri = $uri->withPath($requestUriParts[0]);

            if (isset($requestUriParts[1])) {

                $hasQuery = true;

                $uri = $uri->withQuery($requestUriParts[1]);

            }

        }

        if (!$hasQuery && isset($_SERVER['QUERY_STRING'])) {

            $uri = $uri->withQuery($_SERVER['QUERY_STRING']);

        }

        return $uri;

    }

    /**

     * {@inheritdoc}

     */

    public function getServerParams()

    {

        return $this->serverParams;

    }

    /**

     * {@inheritdoc}

     */

    public function getUploadedFiles()

    {

        return $this->uploadedFiles;

    }

    /**

     * {@inheritdoc}

     */

    public function withUploadedFiles(array $uploadedFiles)

    {

        $new = clone $this;

        $new->uploadedFiles = $uploadedFiles;

        return $new;

    }

    /**

     * {@inheritdoc}

     */

    public function getCookieParams()

    {

        return $this->cookieParams;

    }

    /**

     * {@inheritdoc}

     */

    public function withCookieParams(array $cookies)

    {

        $new = clone $this;

        $new->cookieParams = $cookies;

        return $new;

    }

    /**

     * {@inheritdoc}

     */

    public function getQueryParams()

    {

        return $this->queryParams;

    }

    /**

     * {@inheritdoc}

     */

    public function withQueryParams(array $query)

    {

        $new = clone $this;

        $new->queryParams = $query;

        return $new;

    }

    /**

     * {@inheritdoc}

     */

    public function getParsedBody()

    {

        return $this->parsedBody;

    }

    /**

     * {@inheritdoc}

     */

    public function withParsedBody($data)

    {

        $new = clone $this;

        $new->parsedBody = $data;

        return $new;

    }

    /**

     * {@inheritdoc}

     */

    public function getAttributes()

    {

        return $this->attributes;

    }

    /**

     * {@inheritdoc}

     */

    public function getAttribute($attribute, $default = null)

    {

        if (false === array_key_exists($attribute, $this->attributes)) {

            return $default;

        }

        return $this->attributes[$attribute];

    }

    /**

     * {@inheritdoc}

     */

    public function withAttribute($attribute, $value)

    {

        $new = clone $this;

        $new->attributes[$attribute] = $value;

        return $new;

    }

    /**

     * {@inheritdoc}

     */

    public function withoutAttribute($attribute)

    {

        if (false === array_key_exists($attribute, $this->attributes)) {

            return $this;

        }

        $new = clone $this;

        unset($new->attributes[$attribute]);

        return $new;

    }

}