<?php

defined ('VARIABLE') or die;

/*
** Create a list of required hooks according to current one's dependencies
** $id  : id of current hook in global $gl_hooks array
** $chain : list of already required hooks to avoid circular references
** $result : output array containing hooks to be included
*/
function hookRequire ($id, $chain, &$result)
{
 global $gl_hooks;

 // Browse hooks required by current one
 $hook = &$gl_hooks[$id];

 foreach ($hook['ref'] as $ref => $needed)
 {
  // Check for circular references
  if (isset ($chain[$ref]))
   showError (tra ('error.internal_hook_circular', array ('source' => $id, 'target' => $ref)));

  // Check for required hook availability and dependencies
  if (isset ($gl_hooks[$ref]))
   hookRequire ($ref, $chain + array ($ref => 0), $result);
  else if ($needed)
   showError (tra ('error.internal_hook_needed', array ('source' => $id, 'target' => $ref)));
 }

 // Check if hook has already been registered
 foreach ($result as $i => $item)
 {
  if ($item['id'] == $id)
   return;
 }

 // Insert hook regarding its weights and already included dependencies
 if (is_file ($hook['path']))
 {
  $min = -1;

  foreach ($hook['ref'] as $ref => $null)
   foreach ($result as $i => $item)
    if ($item['id'] == $ref)
     $min = max ($min, $i);

  for ($index = count ($result); $index > $min + 1 && $result[$index - 1]['weight'] > $hook['weight']; )
   --$index;

  array_splice ($result, $index, 0, array (array
  (
   'access' => $hook['access'],
   'id'  => $id,
   'module' => $hook['module'],
   'path'  => $hook['path'],
   'weight' => $hook['weight']
  )));
 }
 else
  showError (tra ('error.internal_hook_file', array ('file' => $hook['file'], 'module' => tra ($hook['module'], array (), false))));
}

?>