<?php

namespace GuzzleHttp\Psr7;

use InvalidArgumentException;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\StreamInterface;
use Psr\Http\Message\UriInterface;

/**
* PSR-7 request implementation.
*/
class Request implements RequestInterface
{
use MessageTrait;

/** @var string */
private $method;

/** @var string|null */
private $requestTarget;

/** @var UriInterface */
private $uri;

/**
* @param string $method HTTP method
* @param string|UriInterface $uri URI
* @param array $headers Request headers
* @param string|resource|StreamInterface|null $body Request body
* @param string $version Protocol version
*/
public function __construct(
$method,
$uri,
array $headers = [],
$body = null,
$version = '1.1'
) {
$this->assertMethod($method);
if (!($uri instanceof UriInterface)) {
$uri = new Uri($uri);
}

$this->method = strtoupper($method);
$this->uri = $uri;
$this->setHeaders($headers);
$this->protocol = $version;

if (!isset($this->headerNames['host'])) {
$this->updateHostFromUri();
}

if ($body !== '' && $body !== null) {
$this->stream = Utils::streamFor($body);
}
}

public function getRequestTarget()
{
if ($this->requestTarget !== null) {
return $this->requestTarget;
}

$target = $this->uri->getPath();
if ($target == '') {
$target = '/';
}
if ($this->uri->getQuery() != '') {
$target .= '?' . $this->uri->getQuery();
}

return $target;
}

public function withRequestTarget($requestTarget)
{
if (preg_match('#\s#', $requestTarget)) {
throw new InvalidArgumentException(
'Invalid request target provided; cannot contain whitespace'
);
}

$new = clone $this;
$new->requestTarget = $requestTarget;
return $new;
}

public function getMethod()
{
return $this->method;
}

public function withMethod($method)
{
$this->assertMethod($method);
$new = clone $this;
$new->method = strtoupper($method);
return $new;
}

public function getUri()
{
return $this->uri;
}

public function withUri(UriInterface $uri, $preserveHost = false)
{
if ($uri === $this->uri) {
return $this;
}

$new = clone $this;
$new->uri = $uri;

if (!$preserveHost || !isset($this->headerNames['host'])) {
$new->updateHostFromUri();
}

return $new;
}

private function updateHostFromUri()
{
$host = $this->uri->getHost();

if ($host == '') {
return;
}

if (($port = $this->uri->getPort()) !== null) {
$host .= ':' . $port;
}

if (isset($this->headerNames['host'])) {
$header = $this->headerNames['host'];
} else {
$header = 'Host';
$this->headerNames['host'] = 'Host';
}
// Ensure Host is the first header.
// See: http://tools.ietf.org/html/rfc7230#section-5.4
$this->headers = [$header => [$host]] + $this->headers;
}

private function assertMethod($method)
{
if (!is_string($method) || $method === '') {
throw new \InvalidArgumentException('Method must be a non-empty string.');
}
}
}