<?
/*-------------------------------------------------------------------
   group_delete.php Ver. $Revision: 1.2 $ 		$Date: 2003/05/21 01:58:49 $ 
*
   Copyright (C) 2000 Hong Kong Baptist University
*
   This file is part of the Quadrille system.
*  This program is free software; it is distributed under the terms of
   the GNU General Public License, either version 2, or (at your option)
*  any later version.

*  This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
*
---------------------------------------------------------------------
*/
?>
<?
require "global_inc.php";
require "config_inc.php";
require "template.php";
include $language_pack;
include "user_{$lang_name}.inc";
require "user_function_inc.php";
require "output_inc.php";
/*************/
/* Main Part */
/*************/
	check_expire();
	$temp_cookie[user_uid] = $cookie[user_uid];
	$temp_cookie[password] = $cookie[password];
	$temp_cookie[db_index] = $cookie[db_index];
	$temp_cookie[course_uid] = $cookie[course_uid];
	$temp_cookie[unit_uid] = $cookie[unit_uid];
	set_cookie($temp_cookie);
	$AcceptRole=array("Adm","Tea");
	restrict_access($AcceptRole);

	insert_header();

	$currentlocation = insert_current_location($cookie["course_uid"],$cookie["unit_uid"],$cookie["paper_uid"]);//
	$content = delete_group();



	$html = get_template($template, $template_dir);
	$html=ereg_replace("<BEGIN>TITLE<END>",$DEL_GROUP,$html);
	$html=ereg_replace("<BEGIN>CONTENT<END>",$content,$html);
	$html=ereg_replace("<BEGIN>CURRENTLOCATION<END>",$currentlocation,$html);
	$html=ereg_replace("<BEGIN>COPYRIGHT<END>",$COPYRIGHT,$html);

	$html=ereg_replace("<BEGIN>JAVASCRIPT<END>",$java,$html);
	print $html;
	
/***********************/
/*   Function Part   */
/**********************/
function group_empty($group_uid) {
	//user_in_group
	$query="select * from USER_IN_GROUP where GROUP_UID = $group_uid";
	$result = mysql_query($query);
	return (mysql_num_rows($result)<=0);
}


function delete_group() {
	global $uid;
	include ("./config_inc.php");
  	include $language_pack;
	include "user_{$lang_name}.inc";	
	global $group_uid;
	global $Confirmed;
	global $fromURL;
	$query = "select * from GROUP_INFO where UID = $group_uid";
	
	$row = "";
	
	if (isset($Confirmed)) {
		//$content.=insert_link($BACK,$fromURL,0);
		//$content.="<input type=button value=\"$BACK\" onclick=\"javascript:document.location='$fromURL';\">\n";
		$query="delete from LEARN where USER_TYPE = 'Group' and USER_UID = $group_uid";
		$result = mysql_query($query);
		
		$query="delete from USER_IN_GROUP where GROUP_UID = $group_uid";
		$result = mysql_query($query);
		
		$query="delete from GROUP_INFO where UID = $group_uid";
		$result = mysql_query($query);
		
		unset($Confirmed);
		header("location:$fromURL");
	}
	
	$result = mysql_query($query);
	if (mysql_num_rows($result) >0 ) {
		$row = mysql_fetch_array($result);
	
		global $fromURL;
		global $Confirmed;
		$content="";
		$errorStr="";
		if (!group_empty($group_uid)) {
			$errorStr=$GROUP_NOT_EMPTY;
		}

		$content.="<table width=\"\" border=0 cellspacing=4 cellpadding=5 >";
		
		$content.=display_field($GROUP_ID,$row["ID"],'readonly',1);
		$content.=display_field($GROUP_NAME,$row["NAME"],'readonly',1);
		$content.=display_field($GROUP_DESC,$row["DESCRIPTION"],'readonly',1);
			
		$content.="</table>\n"."<br />";
		$content.="<form name=\"form1\" method=\"post\" action=\"group_delete.php\">"; 
		$content.="<input type=\"hidden\" name=\"fromURL\" value = \"$fromURL\">";
		$content.="<input type=\"hidden\" name=\"group_uid\" value = \"$group_uid\">";
		$content.="<input type=\"hidden\" name=\"Confirmed\" value = \"1\">";
  		$content.=insert_warning($errorStr)."<br />";
		if (isset($Confirmed) && ($errorStr=="") ) {
			$content.=$DELETE_GROUP_CONFIRM."<br />";
		}
		
		$content.="<br />";
		$content.="<input type=button value=\"$OK\" onclick=\"javascript:document.form1.submit();\">\n";
		$content.="<input type=button value=\"$CANCEL\" onclick=\"javascript:document.location='$fromURL';\">\n";
		$content.="\n</form>";
	}	
  
return $content;

}
?>