<?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))));
}

?>