<?php

/**
 * This file is part of the CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace CodeIgniter\HTTP;

use CodeIgniter\HTTP\Exceptions\HTTPException;
use Config\App;

/**
 * Representation of an outgoing, getServer-side response.
 *
 * Per the HTTP specification, this interface includes properties for
 * each of the following:
 *
 * - Protocol version
 * - Status code and reason phrase
 * - Headers
 * - Message body
 */
class Response extends Message implements MessageInterface, ResponseInterface
{
	use ResponseTrait;

	/**
	 * HTTP status codes
	 *
	 * @var array
	 */
	protected static $statusCodes = [
		// 1xx: Informational
		100 => 'Continue',
		101 => 'Switching Protocols',
		102 => 'Processing', // http://www.iana.org/go/rfc2518
		103 => 'Early Hints', // http://www.ietf.org/rfc/rfc8297.txt
		// 2xx: Success
		200 => 'OK',
		201 => 'Created',
		202 => 'Accepted',
		203 => 'Non-Authoritative Information', // 1.1
		204 => 'No Content',
		205 => 'Reset Content',
		206 => 'Partial Content',
		207 => 'Multi-Status', // http://www.iana.org/go/rfc4918
		208 => 'Already Reported', // http://www.iana.org/go/rfc5842
		226 => 'IM Used', // 1.1; http://www.ietf.org/rfc/rfc3229.txt
		// 3xx: Redirection
		300 => 'Multiple Choices',
		301 => 'Moved Permanently',
		302 => 'Found', // Formerly 'Moved Temporarily'
		303 => 'See Other', // 1.1
		304 => 'Not Modified',
		305 => 'Use Proxy', // 1.1
		306 => 'Switch Proxy', // No longer used
		307 => 'Temporary Redirect', // 1.1
		308 => 'Permanent Redirect', // 1.1; Experimental; http://www.ietf.org/rfc/rfc7238.txt
		// 4xx: Client error
		400 => 'Bad Request',
		401 => 'Unauthorized',
		402 => 'Payment Required',
		403 => 'Forbidden',
		404 => 'Not Found',
		405 => 'Method Not Allowed',
		406 => 'Not Acceptable',
		407 => 'Proxy Authentication Required',
		408 => 'Request Timeout',
		409 => 'Conflict',
		410 => 'Gone',
		411 => 'Length Required',
		412 => 'Precondition Failed',
		413 => 'Request Entity Too Large',
		414 => 'Request-URI Too Long',
		415 => 'Unsupported Media Type',
		416 => 'Requested Range Not Satisfiable',
		417 => 'Expectation Failed',
		418 => "I'm a teapot", // April's Fools joke; http://www.ietf.org/rfc/rfc2324.txt
		// 419 (Authentication Timeout) is a non-standard status code with unknown origin
		421 => 'Misdirected Request', // http://www.iana.org/go/rfc7540 Section 9.1.2
		422 => 'Unprocessable Entity', // http://www.iana.org/go/rfc4918
		423 => 'Locked', // http://www.iana.org/go/rfc4918
		424 => 'Failed Dependency', // http://www.iana.org/go/rfc4918
		425 => 'Too Early', // https://datatracker.ietf.org/doc/draft-ietf-httpbis-replay/
		426 => 'Upgrade Required',
		428 => 'Precondition Required', // 1.1; http://www.ietf.org/rfc/rfc6585.txt
		429 => 'Too Many Requests', // 1.1; http://www.ietf.org/rfc/rfc6585.txt
		431 => 'Request Header Fields Too Large', // 1.1; http://www.ietf.org/rfc/rfc6585.txt
		451 => 'Unavailable For Legal Reasons', // http://tools.ietf.org/html/rfc7725
		499 => 'Client Closed Request', // http://lxr.nginx.org/source/src/http/ngx_http_request.h#0133
		// 5xx: Server error
		500 => 'Internal Server Error',
		501 => 'Not Implemented',
		502 => 'Bad Gateway',
		503 => 'Service Unavailable',
		504 => 'Gateway Timeout',
		505 => 'HTTP Version Not Supported',
		506 => 'Variant Also Negotiates', // 1.1; http://www.ietf.org/rfc/rfc2295.txt
		507 => 'Insufficient Storage', // http://www.iana.org/go/rfc4918
		508 => 'Loop Detected', // http://www.iana.org/go/rfc5842
		510 => 'Not Extended', // http://www.ietf.org/rfc/rfc2774.txt
		511 => 'Network Authentication Required', // http://www.ietf.org/rfc/rfc6585.txt
		599 => 'Network Connect Timeout Error', // https://httpstatuses.com/599
	];

	/**
	 * The current reason phrase for this response.
	 * If empty string, will use the default provided for the status code.
	 *
	 * @var string
	 */
	protected $reason = '';

	/**
	 * The current status code for this response.
	 * The status code is a 3-digit integer result code of the server's attempt
     * to understand and satisfy the request.
	 *
	 * @var integer
	 */
	protected $statusCode = 200;

	/**
	 * If true, will not write output. Useful during testing.
	 *
	 * @var boolean
	 *
	 * @internal Used for framework testing, should not be relied on otherwise
	 */
	protected $pretend = false;

	//--------------------------------------------------------------------

	/**
	 * Constructor
	 *
	 * @param App $config
	 *
	 * @todo Recommend removing reliance on config injection
	 */
	public function __construct($config)
	{
		// Default to a non-caching page.
		// Also ensures that a Cache-control header exists.
		$this->noCache();

		// We need CSP object even if not enabled to avoid calls to non existing methods
		$this->CSP = new ContentSecurityPolicy(new \Config\ContentSecurityPolicy());

		$this->CSPEnabled     = $config->CSPEnabled;
		$this->cookiePrefix   = $config->cookiePrefix;
		$this->cookieDomain   = $config->cookieDomain;
		$this->cookiePath     = $config->cookiePath;
		$this->cookieSecure   = $config->cookieSecure;
		$this->cookieHTTPOnly = $config->cookieHTTPOnly;
		$this->cookieSameSite = $config->cookieSameSite ?? $this->cookieSameSite;

		if (! in_array(strtolower($this->cookieSameSite), ['', 'none', 'lax', 'strict'], true))
		{
			throw HTTPException::forInvalidSameSiteSetting($this->cookieSameSite);
		}

		// Default to an HTML Content-Type. Devs can override if needed.
		$this->setContentType('text/html');
	}

	//--------------------------------------------------------------------

	/**
	 * Turns "pretend" mode on or off to aid in testing.
	 * Note that this is not a part of the interface so
	 * should not be relied on outside of internal testing.
	 *
	 * @param boolean $pretend
	 *
	 * @return $this
	 */
	public function pretend(bool $pretend = true)
	{
		$this->pretend = $pretend;

		return $this;
	}

	/**
	 * Gets the response status code.
	 *
	 * The status code is a 3-digit integer result code of the getServer's attempt
	 * to understand and satisfy the request.
	 *
	 * @return integer Status code.
	 */
	public function getStatusCode(): int
	{
		if (empty($this->statusCode))
		{
			throw HTTPException::forMissingResponseStatus();
		}

		return $this->statusCode;
	}

	/**
	 * Gets the response response phrase associated with the status code.
	 *
	 * @see http://tools.ietf.org/html/rfc7231#section-6
	 * @see http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
	 *
	 * @return string
	 *
	 * @deprecated Use getReasonPhrase()
	 */
	public function getReason(): string
	{
		return $this->getReasonPhrase();
	}

    /**
     * Gets the response reason phrase associated with the status code.
     *
     * Because a reason phrase is not a required element in a response
     * status line, the reason phrase value MAY be null. Implementations MAY
     * choose to return the default RFC 7231 recommended reason phrase (or those
     * listed in the IANA HTTP Status Code Registry) for the response's
     * status code.
     *
     * @link http://tools.ietf.org/html/rfc7231#section-6
     * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
     * @return string Reason phrase; must return an empty string if none present.
     */
    public function getReasonPhrase()
    {
		if ($this->reason === '')
		{
			return ! empty($this->statusCode) ? static::$statusCodes[$this->statusCode] : '';
		}

		return $this->reason;
	}
}