<?php //$id: $
/* For licensing terms, see /dokeos_license.txt */
/**
 * @package dokeos.glossary
 * @author Christian Fasanando, initial version
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium, refactoring and tighter integration in Dokeos
 */

// name of the language file that needs to be included
$language_file = array('glossary');

// including the global dokeos file
require_once('../inc/global.inc.php');
require_once('../inc/lib/events.lib.inc.php');

// the section (tabs)
$this_section=SECTION_COURSES;

// notice for unauthorized people.
api_protect_course_script(true);

// including additional libraries
require_once (api_get_path(LIBRARY_PATH).'formvalidator/FormValidator.class.php');

// additional javascript
$htmlHeadXtra[] = javascript_glossary();

// setting the tool constants
$tool = TOOL_GLOSSARY;

// tracking
event_access_tool(TOOL_GLOSSARY);

// displaying the header
Display::display_header(get_lang(ucfirst($tool)));

// tool introduction

// The settings here for the online editor are needed and they are specific for the introduction section.
// Please, preserve them.
$fck_attribute['Width'] = '100%';
$fck_attribute['Height'] = '300';
$fck_attribute['ToolbarSet'] = 'Introduction';

Display::display_introduction_section(TOOL_GLOSSARY,'left');

$fck_attribute = null; // Clearing this global variable immediatelly after it has been used.

// Glossary FckEditor setting

$fck_attribute['Width'] = '100%';
$fck_attribute['Height'] = '400';
$fck_attribute['ToolbarSet'] = 'Glossary';


// action links
echo '<div class="actions">';
if (api_is_allowed_to_edit())
{
	echo '<a href="index.php?'.api_get_cidreq().'&action=addglossary&msg=add">'.Display::return_icon('filenew.gif',get_lang('TermAddNew')).get_lang('TermAddNew').'</a>';
}
echo '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=list">'.Display::return_icon('view_list.gif',get_lang('ListView')).get_lang('ListView').'</a>';
echo '<a href="index.php?'.api_get_cidreq().'&action=changeview&view=table">'.Display::return_icon('view_table.gif',get_lang('TableView')).get_lang('TableView').'</a>';
echo '</div>';

if ($_GET['action'] == 'changeview' AND in_array($_GET['view'],array('list','table')))
{
	$_SESSION['glossary_view'] = $_GET['view']; 
}

if (api_is_allowed_to_edit())
{
	// Adding a glossary
	if (isset($_GET['action']) && $_GET['action'] == 'addglossary') 
	{
		if (isset($_GET['msg']) && $_GET['msg'] == 'add') {
			api_display_tool_title(get_lang('TermAddNew'));
		}
		// initiate the object
		$form = new FormValidator('glossary','post', api_get_self().'?action='.Security::remove_XSS($_GET['action']));
		// settting the form elements		
		$form->addElement('text', 'glossary_title', get_lang('TermName'), array('size'=>'100'));
		$form->addElement('html_editor', 'glossary_comment', get_lang('TermDefinition'));
		$form->addElement('style_submit_button', 'SubmitGlossary', get_lang('TermAddButton'), 'class="add"');	
		
		// setting the rules
		$form->addRule('glossary_title', '<div class="required">'.get_lang('ThisFieldIsRequired'), 'required');	
		
		// The validation or display
		if ( $form->validate() ) 
		{
			$check = Security::check_token('post');	
			if ($check) 
			{
		   		$values = $form->exportValues();
		   		save_glossary($values);
		   		display_glossary();
			}
			Security::clear_token();
		} 
		else 
		{
			$token = Security::get_token();
			$form->addElement('hidden','sec_token');
			$form->setConstants(array('sec_token' => $token));		
			$form->display();
		}				
	}
	
	// Editing a glossary
	else if (isset($_GET['action']) && $_GET['action'] == 'edit_glossary' && is_numeric($_GET['glossary_id'])) 
	{
		if (isset($_GET['msg']) && $_GET['msg'] == 'edit') {
			api_display_tool_title(get_lang('TermEdit'));
		}		
		// initiate the object
		$form = new FormValidator('glossary','post', api_get_self().'?action='.Security::remove_XSS($_GET['action']).'&glossary_id='.Security::remove_XSS($_GET['glossary_id']));
		// settting the form elements		
		$form->addElement('hidden', 'glossary_id');
		$form->addElement('text', 'glossary_title', get_lang('TermName'),array('size'=>'100'));
		$form->addElement('html_editor', 'glossary_comment', get_lang('TermDefinition'));
		$form->addElement('style_submit_button', 'SubmitGlossary', get_lang('TermUpdateButton'), 'class="save"');	
		
		// setting the defaults
		$defaults = get_glossary_information(Security::remove_XSS($_GET['glossary_id']));
		$form->setDefaults($defaults);
		
		// setting the rules
		$form->addRule('glossary_title', '<div class="required">'.get_lang('ThisFieldIsRequired'), 'required');	
		
		// The validation or display
		if ( $form->validate() ) 
		{
			$check = Security::check_token('post');	
			if ($check) 
			{
		   		$values = $form->exportValues();
		   		update_glossary($values);
		   		display_glossary();
			}
			Security::clear_token();
		} 
		else 
		{
			$token = Security::get_token();
			$form->addElement('hidden','sec_token');
			$form->setConstants(array('sec_token' => $token));		
			$form->display();
		}				
	}

	// deleting a glossary
	else if (isset($_GET['action']) && $_GET['action'] == 'delete_glossary' && is_numeric($_GET['glossary_id'])) 
	{
		delete_glossary(Security::remove_XSS($_GET['glossary_id']));
		display_glossary();
	}
	
	// moving a glossary term up
	else if (isset($_GET['action']) && $_GET['action'] == 'moveup' && is_numeric($_GET['glossary_id'])) 
	{
		move_glossary('up',$_GET['glossary_id']);
		display_glossary();
	}
	// moving a glossary term up
	else if (isset($_GET['action']) && $_GET['action'] == 'movedown' && is_numeric($_GET['glossary_id'])) 
	{
		move_glossary('down',$_GET['glossary_id']);
		display_glossary();
	} else {
		display_glossary();
	}	
} else {
	display_glossary();
}


// footer
Display::display_footer();

/**
 * This functions stores the glossary in the database
 *
 * @param unknown_type $values
 * 
 * @author Christian Fasanando <christian.fasanando@dokeos.com>
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function save_glossary($values)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);	
	
	// get the maximum display order of all the glossary items
	$max_glossary_item = get_max_glossary_item();
	
	// check if the glossary term already exists
	if (glossary_exists($values['glossary_title']))
	{
		// display the feedback message
		Display::display_error_message('GlossaryTermAlreadyExistsYouShouldEditIt');
	}
	else 
	{
		$sql = "INSERT INTO $t_glossary (name, description,display_order) 
				VALUES(
					'".Database::escape_string($values['glossary_title'])."', 
					'".Database::escape_string($values['glossary_comment'])."',
					'".(int)($max_glossary_item + 1)."')";
		$result = api_sql_query($sql, __FILE__, __LINE__);
		$id = Database::get_last_insert_id();
		if ($id>0) {
			//insert into item_property
			api_item_property_update(api_get_course_info(),TOOL_GLOSSARY,$id,'GlossaryAdded',api_get_user_id());
		}
		$_SESSION['max_glossary_display'] = get_max_glossary_item();	
		// display the feedback message
		Display::display_confirmation_message(get_lang('TermAdded'));	
	}
}

/**
 * update the information of a glossary term in the database
 *
 * @param array $values an array containing all the form elements
 * 
 * @author Christian Fasanando <christian.fasanando@dokeos.com>
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function update_glossary($values)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);	

	
	// check if the glossary term already exists
	if (glossary_exists($values['glossary_title'],$values['glossary_id']))
	{
		// display the feedback message
		Display::display_error_message('GlossaryTermAlreadyExistsYouShouldEditIt');
	}
	else 
	{	
		$sql = "UPDATE $t_glossary SET 
						name 		= '".Database::escape_string($values['glossary_title'])."', 
						description	= '".Database::escape_string($values['glossary_comment'])."'
				WHERE glossary_id = ".Database::escape_string($values['glossary_id']);
		$result = api_sql_query($sql, __FILE__, __LINE__);
		//update glossary into item_property
		api_item_property_update(api_get_course_info(),TOOL_GLOSSARY,Database::escape_string($values['glossary_id']),'GlossaryModified',api_get_user_id());	
		// display the feedback message
		Display::display_confirmation_message(get_lang('TermUpdated'));
	}
}

/**
 * Get the maximum display order of the glossary item
 *
 * @author Christian Fasanando <christian.fasanando@dokeos.com>
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function get_max_glossary_item()
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);
	
	$get_max = "SELECT MAX(display_order) FROM $t_glossary";
	$res_max = api_sql_query($get_max, __FILE__, __LINE__);
	$dsp=0;
	$row = Database::fetch_array($res_max);
	return $row[0];
}

/**
 * check if the glossary term exists or not
 *
 * @param unknown_type $term
 * @param unknown_type $not_id
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function glossary_exists($term,$not_id='')
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);
		
	$sql = "SELECT name FROM $t_glossary WHERE name = '".Database::escape_string($term)."'";
	if ($not_id<>'')
	{
		$sql .= " AND glossary_id <> '".Database::escape_string($not_id)."'";
	}
	$result = api_sql_query($sql,__FILE__,__LINE__);
	$count = Database::num_rows($result);
	if ($count > 0)
	{
		return true;
	}
	else 
	{
		return false;
	}
}
/**
 * get all the information about one specific glossary term
 *
 * @param unknown_type $glossary_id
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function get_glossary_information($glossary_id)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);
	$t_item_propery = Database :: get_course_table(TABLE_ITEM_PROPERTY);	
	
	$sql = "SELECT 	g.glossary_id 		AS glossary_id, 
					g.name 				AS glossary_title, 
					g.description 		AS glossary_comment, 
					g.display_order		AS glossary_display_order
			   FROM $t_glossary g, $t_item_propery ip 
			   WHERE g.glossary_id = ip.ref 
			   AND tool = '".TOOL_GLOSSARY."' 
			   AND g.glossary_id = '".Database::escape_string($glossary_id)."' ";	
	$result = api_sql_query($sql, __FILE__, __LINE__);
	return Database::fetch_array($result);
}

/**
 * Delete a glossary term (and re-order all the others)
 *
 * @param integer $glossary_id the id of the glossary
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function delete_glossary($glossary_id)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);

	$sql = "DELETE FROM $t_glossary WHERE glossary_id='".Database::escape_string($glossary_id)."'";
	$result = api_sql_query($sql, __FILE__, __LINE__);	
	
	// reorder the remaining terms
	reorder_glossary();
	$_SESSION['max_glossary_display'] = get_max_glossary_item();
	Display::display_confirmation_message(get_lang('TermDeleted'));	
}

/**
 * This is the main function that display the list or the table with all the glossary terms
 *
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function display_glossary()
{
	if (!$_SESSION['glossary_view'] OR $_SESSION['glossary_view'] == 'table')
	{
		$table = new SortableTable('glossary', 'get_number_glossary_terms', 'get_glossary_data',0);
		$table->set_header(0, get_lang('DisplayOrder'), true);
		$table->set_header(1, get_lang('TermName'), true);
		$table->set_header(2, get_lang('TermDefinition'), true);
		$table->set_header(3, get_lang('CreationDate'), false);
		$table->set_header(4, get_lang('UpdateDate'), false);
		if (api_is_allowed_to_edit()) {
		$table->set_header(5, get_lang('Actions'), false);		
		$table->set_column_filter(5, 'actions_filter');
		}
		$table->display();
	}
	if ($_SESSION['glossary_view'] == 'list')
	{
		display_glossary_list();
	}
}

/**
 * display the glossary terms in a list
 *
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function display_glossary_list()
{
	$glossary_data = get_glossary_data(0,1000,0,ASC);
	foreach($glossary_data as $key=>$glossary_item)
	{
		echo '<div class="sectiontitle">'.$glossary_item[1].'</div>';
		echo '<div class="sectioncomment">'.$glossary_item[2].'</div>';
		if (api_is_allowed_to_edit()) {
			echo '<div>'.actions_filter($glossary_item[5], '',$glossary_item).'</div>';
		}
	}
}

/**
 * Get the number of glossary terms
 *
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function get_number_glossary_terms()
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);

	$sql = "SELECT count(glossary_id) as total FROM $t_glossary";
	$res = api_sql_query($sql, __FILE__, __LINE__);
	$obj = Database::fetch_object($res);
	return $obj->total;	
}

/**
 * get all the data of the glossary
 *
 * @param unknown_type $from
 * @param unknown_type $number_of_items
 * @param unknown_type $column
 * @param unknown_type $direction
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function get_glossary_data($from, $number_of_items, $column, $direction)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);
	$t_item_propery = Database :: get_course_table(TABLE_ITEM_PROPERTY);	
	
	if (api_is_allowed_to_edit()) {
		$col5 = ", glossary.glossary_id	as col5";
	} else {
		$col5 = " ";
	}
	
	$sql = "SELECT 
				glossary.display_order 	as col0, 
				glossary.name 			as col1,
				glossary.description 	as col2,
				ip.insert_date			as col3,
				ip.lastedit_date		as col4
				$col5
			FROM $t_glossary glossary, $t_item_propery ip 
			WHERE glossary.glossary_id = ip.ref 
			AND tool = '".TOOL_GLOSSARY."' ";	
	$sql .= " ORDER BY col$column $direction ";
	$sql .= " LIMIT $from,$number_of_items";

	$res = api_sql_query($sql, __FILE__, __LINE__);
	
	$return = array ();
	while ($data = Database::fetch_row($res))
	{
		$return[] = $data;
	}
	return $return;	
}

/**
 * Enter description here...
 *
 * @param unknown_type $glossary_id
 * @param unknown_type $url_params
 * @param unknown_type $row
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function actions_filter($glossary_id,$url_params,$row)
{
	if (!$_SESSION['max_glossary_display'] OR $_SESSION['max_glossary_display'] == '')
	{
		$_SESSION['max_glossary_display'] = get_max_glossary_item();
	}

	$return = '';
	if (empty($_GET['glossary_column'])) {
		if ($row[0] > 1)
		{
			$return .= '<a href="'.api_get_self().'?action=moveup&amp;glossary_id='.$row[5].'">'.Display::return_icon('up.gif', get_lang('Up')).'</a>';
		}
		else
		{
			$return .= Display::return_icon('up_na.gif');
			
		}
		if ($row[0] < $_SESSION['max_glossary_display'])
		{
			$return .= '<a href="'.api_get_self().'?action=movedown&amp;glossary_id='.$row[5].'">'.Display::return_icon('down.gif',get_lang('Down')).'</a>';
		}
		else
		{
			$return .= Display::return_icon('down_na.gif');
			
		}	
	}
	$return .= '<a href="'.api_get_self().'?action=edit_glossary&amp;glossary_id='.$row[5].'&msg=edit">'.Display::return_icon('edit.gif',get_lang('Edit')).'</a>';
	$return .= '<a href="'.api_get_self().'?action=delete_glossary&amp;glossary_id='.$row[5].'" onclick="return confirmation(\''.$row[1].'\');">'.Display::return_icon('delete.gif', get_lang('Delete')).'</a>';
	return $return;
}

/**
 * a little bit of javascript to display a prettier warning when deleting a term
 *
 * @return unknown
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function javascript_glossary() 
{
	return "<script type=\"text/javascript\">
			function confirmation (name)
			{
				if (confirm(\" ". get_lang("TermConfirmDelete") ." \"+ name + \" ?\"))
					{return true;}
				else
					{return false;}
			}
			</script>";
}

/**
 * Enter description here...
 *
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function reorder_glossary()
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);

	$sql = "SELECT * FROM $t_glossary ORDER by display_order ASC";
	$res = api_sql_query($sql, __FILE__, __LINE__);
	
	$i = 1;
	while ($data = Database::fetch_array($res))
	{
		$sql_reorder = "UPDATE $t_glossary SET display_order = $i WHERE glossary_id = '".Database::escape_string($data['glossary_id'])."'";
		api_sql_query($sql_reorder, __FILE__, __LINE__);
		$i++;
	}
}

/**
 * Enter description here...
 *
 * @param unknown_type $direction
 * @param unknown_type $glossary_id
 * 
 * @author Patrick Cool <patrick.cool@ugent.be>, Ghent University, Belgium
 * @version januari 2009, dokeos 1.8.6
 */
function move_glossary($direction, $glossary_id)
{
	// Database table definition
	$t_glossary = Database :: get_course_table(TABLE_GLOSSARY);
	
	// sort direction 
	if ($direction == 'up')
	{
		$sortorder = 'DESC';
	}
	else 
	{
		$sortorder = 'ASC';
	}
	
	$sql = "SELECT * FROM $t_glossary ORDER BY display_order $sortorder";
	$res = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = Database::fetch_array($res))
	{
		if ($found == true and empty($next_id))
		{
			$next_id = $row['glossary_id'];
			$next_display_order = $row['display_order'];			
		}
		
		if ($row['glossary_id'] == $glossary_id)
		{
			$current_id = $glossary_id;
			$current_display_order = $row['display_order'];
			$found = true;
		}
		
	}
	
	$sql1 = "UPDATE $t_glossary SET display_order = '".Database::escape_string($next_display_order)."' WHERE glossary_id = '".Database::escape_string($current_id)."'";
	$sql2 = "UPDATE $t_glossary SET display_order = '".Database::escape_string($current_display_order)."' WHERE glossary_id = '".Database::escape_string($next_id)."'";
	$res = api_sql_query($sql1, __FILE__, __LINE__);
	$res = api_sql_query($sql2, __FILE__, __LINE__);
}