<?php

require("constants.php");

// This is the content engine for Sophisteria
class SophEngine
{
	private function __construct() { }
	function __destruct() { }
	
	public static $instance;	// Only one instance
	
	private $authtype;			// AuthType.ALLOW or DENY
	private $authgroups;		// Groups to ALLOW or DENY
	
	private $running_script;	// The current Running Script

	private $appsettings;		// Application Settings array
	
	// Load the Configuration File
	public static function Initialize($config) {
		if (!isset(self::$instance)) {
			$c = __CLASS__;
			self::$instance = new $c;
		}
		XmlConfigurator::Load($config);
	}
	
	// Set User Authentication Level
	private function SetAuthenticationLevel($type, $groups) {
		self::$instance->authtype = $type;
		self::$instance->authgroups = $groups;
	}
	
	
	// Run PHP Script
	private function RunScript($source) {
		self::$instance->running_script = $source;
		include(self::$instance->appsettings['RootDirectory'] . $source);
	}
	
	// Add Application Setting
	public function AddApplicationSetting($key, $value) {
		self::$instance->appsettings[$key] = $value;
	}
	
	// Process URL Requests
	public function ProcessClientRequest($path, $userinfo) {
		if (preg_match("(/login)", $path)) {
			self::$instance->RunScript("/content/src/login.php");
			return;
		}
		if (preg_match("(/logout)", $path)) {
			self::$instance->RunScript("/content/src/logout.php");
			return;
		}
		self::$instance->RunScript("/content/src/index.php");
	}
	
	// Load Templates and Display Content
	public function RenderHtmlTemplate($templatevars) {
		preg_match("(/content/src/(.+?)\.php)", self::$instance->running_script, $matches);
		ob_start();
		include(self::$instance->appsettings['RootDirectory'] . "/content/html/" . $matches[1] . ".php");
		$contents = ob_get_clean();
		
		preg_match_all("({TPL_([A-Za-z0-9]+)})", $contents, $templatetags);
		for ($i=0; $i<count($templatetags[1]); $i++) {
			ob_start();
			include(self::$instance->appsettings['RootDirectory'] . "/content/html/templates/" . strtolower($templatetags[1][$i]) . ".php");
			$contents = preg_replace("(" . $templatetags[0][$i] . ")", ob_get_clean(), $contents);
		}
		print $contents;
	}
}

// This class parses an XML file and adds it to the AppSettings array
class XmlConfigurator
{
	public static function Load($config) {
		$file = $config;
		$depth = array();

		function startElement($parser, $name, $attrs) {
			global $tagname;
			$tagname = $name;
		}
		
		function dataHandler($parser, $data) {
			global $tagname;
			if ($tagname != "" && $tagname != "Configuration")
				SophEngine::AddApplicationSetting($tagname, $data);
		}
		
		function endElement($parser, $name) {
			global $tagname;
			$tagname = "";
		}
		
		$xml_parser = xml_parser_create();
		xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, false);
		xml_set_element_handler($xml_parser, "startElement", "endElement");
		xml_set_character_data_handler($xml_parser, "dataHandler");
		
		if (!($fp = fopen($file, "r"))) {
		    die("could not open XML input");
		}

		while ($data = fread($fp, 4096)) {
		    if (!xml_parse($xml_parser, $data, feof($fp))) {
        		die(sprintf("XML error: %s at line %d",
                		    xml_error_string(xml_get_error_code($xml_parser)),
		                    xml_get_current_line_number($xml_parser)));
		    }
		}
		xml_parser_free($xml_parser);
	}
}

?>