<?php
function getTagLinks ()
{
	global $db_tagTableName;
	global $defaultTags;
	global $selectedTags;
	global $allNotesTagName;
	
	if (isset ($selectedTags))
	{
		$tags = $selectedTags;
	}
	else
	{
		$tags = $defaultTags;
	}
	 
	// Send a query to the SQL server, to get a list of used tags
	$result = mysql_query ("SELECT * FROM $db_tagTableName");
	$tagsString = "";
	while (($row = mysql_fetch_array ($result)) != null)
	{
		// Fix for javascript issue in Opera
		$bold = "700";
		$normal = "400";

		// The AllNotes and Default Tag get special Ids so it's possible to document.getElementById() these in JavaScript part
		if ($allNotesTagName == $row["tagname"])
		{
			$tagId = "_TagAllNotes";
		}
		else 
		{
			if ($defaultTags == $row["tagname"])
			{
				$tagId = "_TagDefaultNotes";
			}
			else
			{
				$tagId = "";
			}
		}			

		// If tag is listed in defaultTags, display it bold
		if (strstr ($tags, $row["tagname"]) != false)
		{
			$tagsString .= "<span " . (($tagId != "") ? ("id=\"" . $tagId . "\"") : ("")) . " class=\"tag\" onMouseOver=\"TagOnMouseOver (this)\" style=\"font-weight: " . $bold . ";\" onClick=\"ToggleTag(this)\">";
			$tagsString .= $row["tagname"];
			$tagsString .= "</span>";
			$tagsString .= "<span class=\"tagmenu\" id=\"" . $row["tagname"] . "\" onClick=\"ShowTagContextMenu(this)\"><img style=\"position: relative; top: 3px;\" src=\"images/downarrow.png\" alt=\"*\"></span>";
			$tagsString .= "&nbsp";
		}
		else
		{
			$tagsString .= "<span " . (($tagId != "") ? ("id=\"" . $tagId . "\"") : ("")) . " class=\"tag\" onMouseOver=\"TagOnMouseOver (this)\" style=\"font-weight: " . $normal . ";\" onClick=\"ToggleTag(this)\">";
			$tagsString .= $row["tagname"];
			$tagsString .= "</span>";
			$tagsString .= "<span class=\"tagmenu\" id=\"" . $row["tagname"] . "\" onClick=\"ShowTagContextMenu(this)\"><img style=\"position: relative; top: 3px;\" src=\"images/downarrow.png\" alt=\"*\"></span>";
			$tagsString .= "&nbsp";
		}
	 }
	 // Update Javascript variable which contains the actually selected notes
	 $tagsString .= "<script type=\"text/javascript\">SetActiveTags(\"" . $tags . "\");</script>";
	 return $tagsString;
}

// Checks if the Tag String is empty, and sets it to default active tags if so
// ---------------------------------------------------------------------------
// IN/OUT $tags - The String which contains the TagNames seperated by spaces
function CheckIfIsEmptyTag (&$tags)
{
	global $defaultTags;
	
	if (trim($tags) == "")
		$tags = $defaultTags;
}

// Updates tags in database
// Parameter $note is unused. Remove!
function updateNoteTags ($note, $tags, $id)
{
  global $db_tagTableName;
  global $db_tableName;
  global $db_noteTagsTableName;

  $result = mysql_query ("DELETE FROM $db_noteTagsTableName WHERE noteid='$id'");
  // Foreach tag take a look if it exists in database, if not insert it
  // Update the notetags table and insert noteid and tagid
  foreach (explode (" ", $tags) as $tag)
  {
    $tag = ereg_replace ("[^a-zA-Z0-9 ]*", "", $tag);
    $tag = trim($tag);
    if ($tag == "")
      continue;
    $result = mysql_query ("SELECT * from $db_tagTableName WHERE tagname='$tag'");
    if ($result)
    {
      if (mysql_num_rows ($result) == 0)
	    {
        $result = mysql_query ("INSERT INTO $db_tagTableName (tagname, rating) VALUES('$tag', '0')");
        echo mysql_error ();
		    $result = mysql_query ("SELECT * from $db_tagTableName WHERE tagname='$tag';");
      }
    }
    $row = mysql_fetch_array($result); 
    $tagId = $row["id"];
    
    $result = mysql_query ("INSERT INTO $db_noteTagsTableName (tagid, noteid) VALUES($tagId, $id);");
  }
}

// Renames a Tag in Database
function RenameTag ($oldTag, $newTag)
{
	global $db_tagTableName;
	$query = "SELECT id FROM $db_tagTableName WHERE `tagname`='$oldTag'";
	$result = mysql_query($query);
	if ($result)
	{
		$row = mysql_fetch_array($result);
		$id = $row["id"];
		if (isset ($id))
		{
			$query = "UPDATE $db_tagTableName SET tagname='$newTag' WHERE id='$id'";
			$result = mysql_query ($query);
		}
	}
	$jsonArray = array();
	$jsonArray[0]["tagLinks"] = getTagLinks();
	$json = new Services_JSON();
	echo $json->encode($jsonArray);
	exit;
}

// Deletes a tag in database
function DeleteTag ($tagName)
{
	global $db_tagTableName;
	$query = "SELECT id FROM $db_tagTableName WHERE `tagname`='$tagName'";
	$result = mysql_query($query);
	if ($result)
	{
		$row = mysql_fetch_array($result);
		$id = $row["id"];
		if (isset ($id))
		{
			$query = "DELETE FROM $db_tagTableName WHERE id='$id'";
			$result = mysql_query ($query);
			echo mysql_error();
		}
	}
	$jsonArray = array();
	$jsonArray[0]["tagLinks"] = getTagLinks();
	$json = new Services_JSON();
	echo $json->encode($jsonArray);
	exit;
}