<?php

require_once('xmlHandler.php');
$fn_xml = "chatroom.xml";

	// Check that if name (form input) is in the post data, set it in the session cookie
	if (isset($_POST["name"])) {
		setcookie("name", $_POST["name"]);

		// create the chatroom xml file handler
		$xmlh = new xmlHandler($fn_xml);
		if (!$xmlh->fileExist()) {
			header("Location: error.html");
			exit;
		}

		// open the existing XML file
		$xmlh->openFile();

		// get all the child nodes of the the 'users' element
		$users_array = $xmlh->getChildNodes("user");

		
		// check if the ms agent is selected by other users
		if ($users_array!=null) {
			foreach ($users_array as $users) {
				$aname = $xmlh->getAttribute($users, "agent");
        $uname = $xmlh->getAttribute($users, "name");

				if ($aname==$_POST["agentname"] || $uname==$_POST["name"]) {
					header("Location: error.html");
					exit;
				}
			}
		}
		

		// add the user information to the xml file

		// get the 'users' element
		$users_n = $xmlh->getElement("users");

		// create a 'user' element
		$user_n = $xmlh->addElement($users_n, "user");

		// add the user name and agent name
		$xmlh->setAttribute($user_n, "name", $_POST["name"]);
		
		$xmlh->setAttribute($user_n, "agent", $_POST["agentname"]);

		// save the XML file
		$xmlh->saveFile();
	}
	else {
		header("Location: error.html");
		exit;
	}

	// Cookie done, redirect to client.php (to avoid reloading of page from the client)
	header("Location: client.php");
?>