<?php
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
* HTML Generation                                                           *
\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**
 * Figure out the correct way to link to a page, taking into account
 * things like the nice URLs setting.
 *
 * eg make_link("post/list") becomes "/v2/index.php?q=post/list"
 *
 * @param null|string $page
 * @param null|string $query
 * @return string
 */
function make_link(string $page=null, string $query=null): string {
	global $config;

	if(is_null($page)) $page = $config->get_string('main_page');

	if(!is_null(BASE_URL)) {
		$base = BASE_URL;
	}
	elseif(NICE_URLS || $config->get_bool('nice_urls', false)) {
		$base = str_replace('/'.basename($_SERVER["SCRIPT_FILENAME"]), "", $_SERVER["PHP_SELF"]);
	}
	else {
		$base = "./".basename($_SERVER["SCRIPT_FILENAME"])."?q=";
	}

	if(is_null($query)) {
		return str_replace("//", "/", $base.'/'.$page );
	}
	else {
		if(strpos($base, "?")) {
			return $base .'/'. $page .'&'. $query;
		}
		else if(strpos($query, "#") === 0) {
			return $base .'/'. $page . $query;
		}
		else {
			return $base .'/'. $page .'?'. $query;
		}
	}
}


/**
 * Take the current URL and modify some parameters
 *
 * @param array $changes
 * @return string
 */
function modify_current_url(array $changes): string {
	return modify_url($_SERVER['QUERY_STRING'], $changes);
}

function modify_url(string $url, array $changes): string {
	// SHIT: PHP is officially the worst web API ever because it does not
	// have a built-in function to do this.

	// SHIT: parse_str is magically retarded; not only is it a useless name, it also
	// didn't return the parsed array, preferring to overwrite global variables with
	// whatever data the user supplied. Thankfully, 4.0.3 added an extra option to
	// give it an array to use...
	$params = array();
	parse_str($url, $params);

	if(isset($changes['q'])) {
		$base = $changes['q'];
		unset($changes['q']);
	}
	else {
		$base = _get_query();
	}

	if(isset($params['q'])) {
		unset($params['q']);
	}

	foreach($changes as $k => $v) {
		if(is_null($v) and isset($params[$k])) unset($params[$k]);
		$params[$k] = $v;
	}

	return make_link($base, http_build_query($params));
}


/**
 * Turn a relative link into an absolute one, including hostname
 *
 * @param string $link
 * @return string
 */
function make_http(string $link) {
	if(strpos($link, "://") > 0) {
		return $link;
	}

	if(strlen($link) > 0 && $link[0] != '/') {
		$link = get_base_href() . '/' . $link;
	}

	$protocol = is_https_enabled() ? "https://" : "http://";
	$link = $protocol . $_SERVER["HTTP_HOST"] . $link;
	$link = str_replace("/./", "/", $link);

	return $link;
}