<?php

namespace Automad\Core;

/**
 * The Request class.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2020-2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class Request
{
	/**
	 * Return the URL of the currently requested page.
	 *
	 * @return string The requested URL
	 */
	public static function page(): string
	{
		$request = '';

		if (!isset($_SERVER['QUERY_STRING'])) {
			$_SERVER['QUERY_STRING'] = '';
		}

		// Check if the query string starts with a '/'.
		// That is the case if the requested page gets passed as part of the query string when rewriting is enabled (.htaccess or nginx.conf).
		if (strncmp($_SERVER['QUERY_STRING'], '/', 1) === 0) {
			// The requested page gets passed as part of the query string when pretty URLs are enabled and requests get rewritten like:
			// domain.com/page -> domain.com/index.php?/page
			// Or with a query string:
			// domain.com/page?key=value -> domain.com/index.php?/page&key=value
			$query = explode('&', $_SERVER['QUERY_STRING'], 2);
			$request = $query[0];
			Debug::log($query, 'Getting request from QUERY_STRING ' . $_SERVER['QUERY_STRING']);

			// In case there is no real query string except the requested page.
			if (!isset($query[1])) {
				$query[1] = '';
			}

			// Remove request from QUERY_STRING.
			$_SERVER['QUERY_STRING'] = $query[1];

			// Remove request from global arrays.
			unset($_GET[$request]);
			unset($_REQUEST[$request]);
			Debug::log($_GET, '$_GET');
			Debug::log($_REQUEST, '$_REQUEST');
		} else {
			// The requested page gets passed 'index.php/page/path'.
			// That can be the case if rewriting is disabled and AM_BASE_INDEX ends with '/index.php'.
			if (isset($_SERVER['PATH_INFO'])) {
				$request = $_SERVER['PATH_INFO'];
				Debug::log('Getting request from PATH_INFO');
			} elseif (isset($_SERVER['ORIG_PATH_INFO'])) {
				$request = $_SERVER['ORIG_PATH_INFO'];
				Debug::log('Getting request from ORIG_PATH_INFO');
			} elseif (isset($_SERVER['REQUEST_URI'])) {
				$request = Str::stripEnd($_SERVER['REQUEST_URI'], '?' . $_SERVER['QUERY_STRING']);
				$request = Str::stripStart($request, AM_BASE_PROXY);
				$request = Str::stripStart($request, AM_BASE_URL);
				Debug::log('Getting request from REQUEST_URI');
			} elseif (isset($_SERVER['REDIRECT_URL'])) {
				$request = $_SERVER['REDIRECT_URL'];
				$request = Str::stripStart($request, AM_BASE_PROXY);
				$request = Str::stripStart($request, AM_BASE_URL);
				Debug::log('Getting request from REDIRECT_URL');
			}

			Debug::log($_SERVER['REQUEST_URI'] ?? '', 'REQUEST_URI');

			$request = Str::stripStart($request, '/index.php');
		}

		// Remove trailing slash from URL to keep relative links consistent.
		if (substr($request, -1) == '/' && $request != '/') {
			header('Location: ' . AM_BASE_INDEX . rtrim($request, '/'), false, 301);
			die;
		}

		$request = '/' . trim($request, '/');

		Debug::log($request, 'Requested page');

		return $request;
	}


	/**
	 * Return value by key in the $_POST array or any empty string, if that key doesn't exist.
	 * Note: Since this method always returns a string, it should not be used to test whether a key exists in $_POST.
	 *
	 * @param string $key
	 * @return mixed The value for the requested key
	 */
	public static function post(string $key): mixed
	{
		if (isset($_POST[$key])) {
			return $_POST[$key];
		}

		return '';
	}


	/**
	 * Return a sanitized value of a query string parameter or any empty string, if that parameter doesn't exist.
	 * Note: Since this method always returns a string, it should not be used to test whether a parameter exists in the query string,
	 * because a non-existing parameter and an empty string as a parameter's value will return the same.
	 *
	 * @param string $key
	 * @return mixed The value for the requested query key
	 */
	public static function query(string $key): mixed
	{
		if (isset($_GET[$key]) && is_string($_GET[$key])) {
			return htmlspecialchars($_GET[$key]);
		}

		return '';
	}
}
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