<?php
error_reporting(E_ALL);
ini_set('display_errors', TRUE);

function getoutput($blocks = [])
{
	$rep = [];
	foreach ($blocks as $name => $html) {
		$rep["[[$name]]"] = sprintf('<!--BLOCK:%s-->%s<!--/-->',
			is_numeric($name) ? '' : "[[$name]]",
			preg_replace('{<!--[^-]*-->}', '', $html)
		);
	}
	return str_replace(array_keys($rep), array_values($rep), ob_get_clean());
}

# custom error handling

define('DOCROOT', getcwd().'/');

function fail($error)
{
	http_response_code(500);
	include_once 'page.inc.php';
	ob_start();
	require_once DOCROOT.'500.html';
	print getoutput(['debug' => $error]);
}

set_exception_handler('fail');

define('E_FATAL', E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR | E_USER_ERROR);

set_error_handler(function ($level, $error, $file, $line) {
	if ($level & E_FATAL) {
		fail($error);
		return;
	}
	return FALSE;
});

register_shutdown_function(function () {
	# display failure page for fatal exceptions
	$error = error_get_last();
	if (!($error['type'] & E_FATAL)) return;
	fail("Fatal: $error[message] in $error[file]:$error[line]");
});

error_reporting(error_reporting() & ~E_FATAL);

# user login and control

include_once 'auth.inc.php';
$Edit = isset($_GET['edit']);

# distinguish subpage Args from topmost Page script

$Args = '';
$Page = preg_replace('/\?.*/', '', $_SERVER['REQUEST_URI']);
$Page = urldecode(trim($Page, '/')) ?: 'index';
while (TRUE) {
	if (file_exists("$Page/.private")) {
		# access restriction
		if (!isset($User)) {
			http_response_code(303);
			$target = urlencode($_SERVER['REQUEST_URI']);
			header("Location: /login?goto=$target");
			exit;
		}
		$PageAccess = $Page;
	}

	if (file_exists("$Page.php")) {
		break;
	}

	$up = strrpos($Page, '/');
	$Args = substr($Page, $up) . $Args;
	$Page = substr($Page, 0, $up);
	if ($up === FALSE) {
		break;
	}
}

# load static contents

ob_start(); # page body
ob_start(); # inner html
print '<div class="static">'."\n\n";

$found = FALSE;
if (file_exists("$Page$Args/index.html")) {
	$found = include "./$Page$Args/index.html";
}
elseif (file_exists("$Page$Args.html")) {
	$found = include "./$Page$Args.html";
}
elseif (isset($User) and $User['admin']) {
	$found = include (file_exists("$Page/template.html") ? "$Page/template.html" : './template.html');
}

print "</div>\n\n";

# execute dynamic code

if ($Page) {
	$found |= require "./$Page.php";
}

# global html

include_once 'page.inc.php';

if (!$found) {
	# no resulting output
	http_response_code(404);
	ob_start();
	@require "./404.html";
	print getoutput([ 'url' => htmlspecialchars($_SERVER['REQUEST_URI']) ]);
}