<?php

 ///////////
//logistics
function NestedListGetParentId($Id, $TableName)
{
  if (!$TableName || !$Id) return 0;
  $ReturnValue=0;
  global $GlobalMysqlHandler;

  $Query = "SELECT `ParentId` FROM `$TableName` WHERE `Id` =$Id";
  $Query = mysqli_query($GlobalMysqlHandler, $Query);
  
  if (mysqli_num_rows($Query))
  {
    $Data=mysqli_fetch_array($Query);
    $ReturnValue=$Data['ParentId'];
  }
  else
  {
    ErrorLog("[nested_list_functions.php] No table element found at id $Id in table \"$Table\"!");
  }
  
  return $ReturnValue;
}

function NestedListGetName($Id, $TableName)
{
  if (!$TableName || !$Id) return "";
  $ReturnValue="";
  global $GlobalMysqlHandler;

  $Query = "SELECT `Name` FROM `$TableName` WHERE `Id` =$Id";
  $Query = mysqli_query($GlobalMysqlHandler, $Query);
  
  if (mysqli_num_rows($Query))
  {
    $Data=mysqli_fetch_array($Query);
    $ReturnValue=$Data['Name'];
  }
  else
  {
    ErrorLog("[nested_list_functions.php] No table element found at id $Id in table \"$Table\"!");
  }
  
  return $ReturnValue;
}


function NestedLisGetSubelements ($ParentId, $TableName)
{
  if (!$TableName) return 0;
  $ReturnValue=array();
  global $GlobalMysqlHandler;
  
  $Query = "SELECT `Id`,`Name` FROM `$TableName` WHERE `ParentId` = $ParentId";
  $Query = mysqli_query($Query,$GlobalMysqlHandler);
  while ($Item = mysqli_fetch_row($Query))
  {
    $counter=count($ReturnValue);
    $ReturnValue[$counter][0] = $Item[0];
    $ReturnValue[$counter][1] = $Item[1];
  }
  
  return $ReturnValue;
}

 /////////////
// statistics

function NestedListCountSubElements($ParentId, $TableName)
{
  if (!$TableName) return 0;
  $ReturnValue=1;
  global $GlobalMysqlHandler;
  
  $Query = "SELECT * FROM `$TableName` WHERE `ParentId` =$ParentId";
  $Query = mysqli_query($GlobalMysqlHandler, $Query);
  
  $ReturnValue=mysqli_num_rows($Query);
  
  return $ReturnValue;
}

 ///////////////////////////
//list-visibility functions

function NestedListVisibilityToggle ($Id, $ListIdentifier)
{
  if (!$Id || !$ListIdentifier) return;
  if (!isset($_SESSION[$ListIdentifier]))
  {
    $EmptyArray = array();
    $_SESSION[$ListIdentifier] = $EmptyArray;
  }
  
  $IdArray = $_SESSION[$ListIdentifier];
  if (NestedListVisibilityIsSet($Id, $ListIdentifier)) $IdArray[$Id] = "False";
  else $IdArray[$Id] = "True";
  $_SESSION[$ListIdentifier]=$IdArray;
}

function NestedListVisibilitySetAllParents ($Id, $ListIdentifier, $TableName)
{
  global $GlobalMysqlHandler;
  while ($Id)
  {
    $Query="SELECT `ParentId` FROM `$TableName` WHERE `Id` = $Id";
    $Query=mysqli_query($GlobalMysqlHandler, $Query);
    if (mysqli_num_rows($Query))
    {
      $Item=mysqli_fetch_array($Query);
      $Id=$Item['ParentId'];
      NestedListVisibilitySet ($Id,$ListIdentifier);
    }
    else
    {
      ErrorLog("[nested_list_functions.php] No id '$Id' found in table '$TableName'!");
      break;
    }
  }
}

function NestedListVisibilitySet ($Id, $ListIdentifier)
{
  if (!NestedListVisibilityIsSet($Id, $ListIdentifier)) NestedListVisibilityToggle ($Id, $ListIdentifier);
}

function NestedListVisibilityUnset ($Id, $ListIdentifier)
{
  if (NestedListVisibilityIsSet($Id, $ListIdentifier)) NestedListVisibilityToggle ($Id, $ListIdentifier);
}

function NestedListVisibilityIsSet ($Id, $ListIdentifier)
{
  if (!$Id || !$ListIdentifier || !isset($_SESSION[$ListIdentifier])) return 0;
  $IdArray = $_SESSION[$ListIdentifier];
  //$Ret = ((count($IdArray)>=$Id) && (strtolower($IdArray[$Id])=="true")) ? 1:0;
  $Ret = (isset($IdArray[$Id]) && (strtolower($IdArray[$Id])=="true")) ? 1:0;
  return $Ret;
}

function NestedListVisibilityUnsetAllSubelements ($ParentId, $ListIdentifier, $TableName)
{
  if (!$TableName) return 0;
  $ReturnValue=1;
  global $GlobalMysqlHandler;
  
  $Query = "SELECT * FROM `$TableName` WHERE `ParentId` =$ParentId";
  $Query = mysqli_query($GlobalMysqlHandler, $Query);
  while ($Item = mysqli_fetch_array($Query))
  {
    NestedListVisibilityUnset ($Item['Id'], $ListIdentifier);
  }
    
  return $ReturnValue;
}

function NestedListVisibilityUnsetAllElements ($ListIdentifier)
{
  if (!$ListIdentifier) return;
  if (!isset($_SESSION[$ListIdentifier]))
  {
    $EmptyArray = array();
    $_SESSION[$ListIdentifier] = $EmptyArray;
  }
  
  $IdArray = $_SESSION[$ListIdentifier];
  for ($i=0; $i < count($IdArray); $i++) $IdArray[$i] = "False";
  $_SESSION[$ListIdentifier]=$IdArray;
}

?>