<?php
/** 
*
* @package acp
* @version $Id$
* @copyright (c) 2005 phpBB Group 
* @license http://opensource.org/licenses/gpl-license.php GNU Public License 
*
*/

/**
* - Able to check for new module versions (modes changed/adjusted/added/removed)
* Icons for:
* - module enabled and displayed (common)
* - module enabled and not displayed
* - module deactivated
* - category (enabled)
* - category disabled
*/

/**
* @package acp
*/
class acp_modules
{
	var $module_class = '';

	function main($id, $mode)
	{
		global $db, $user, $auth, $template;
		global $config, $phpbb_admin_path, $phpbb_root_path, $phpEx, $SID;

		// Set a global define for modules we might include (the author is able to prevent executing of code with this)
		define('MODULE_INCLUDE', true);

		$user->add_lang('acp/modules');

		$this->tpl_name = 'acp_modules';

		// module class
		$this->module_class = $mode;

		if ($this->module_class == 'ucp')
		{
			$user->add_lang('ucp');
		}
		else if ($this->module_class == 'mcp')
		{
			$user->add_lang('mcp');
		}

		$this->page_title = strtoupper($this->module_class);

		$u_action = "{$phpbb_admin_path}index.$phpEx$SID&amp;i=$id&amp;mode=$mode";
		$parent_id = request_var('parent_id', 0);
		$module_id = request_var('m', 0);
		$action = request_var('action', '');
		$errors = array();

		switch ($action)
		{
			case 'delete':
				if (!$module_id)
				{
					trigger_error($user->lang['NO_MODULE_ID'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
				}
				
				if (confirm_box(true))
				{
					$errors = $this->delete_module($module_id);

					if (!sizeof($errors))
					{
						$this->remove_cache_file();
						trigger_error($user->lang['MODULE_DELETED'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
					}
				}
				else
				{
					confirm_box(false, 'DELETE_MODULE', build_hidden_fields(array(
						'i'			=> $id,
						'mode'		=> $mode,
						'parent_id'	=> $parent_id,
						'module_id'	=> $module_id,
						'action'	=> $action,
					)));
				}

			break;
			
			case 'enable':
			case 'disable':
				if (!$module_id)
				{
					trigger_error($user->lang['NO_MODULE_ID'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
				}
			
				$sql = 'UPDATE ' . MODULES_TABLE . ' 
					SET module_enabled = ' . (($action == 'enable') ? 1 : 0) . "
					WHERE module_id = $module_id";
				$db->sql_query($sql);

				add_log('admin', 'LOG_MODULE_' . strtoupper($action));
				$this->remove_cache_file();

			break;

			case 'move_up':
			case 'move_down':
				if (!$module_id)
				{
					trigger_error($user->lang['NO_MODULE_ID'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
				}

				$sql = 'SELECT parent_id, left_id, right_id, module_langname
					FROM ' . MODULES_TABLE . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND module_id = $module_id";
				$result = $db->sql_query($sql);

				if (!($row = $db->sql_fetchrow($result)))
				{
					trigger_error($user->lang['NO_MODULE'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
				}
				$db->sql_freeresult($result);

				$module_info = array($module_id => $row);

				// Get the adjacent forum
				$sql = 'SELECT module_id, left_id, right_id, module_langname
					FROM ' . MODULES_TABLE . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND parent_id = {$row['parent_id']}
						AND " . (($action == 'move_up') ? "right_id < {$row['right_id']} ORDER BY right_id DESC" : "left_id > {$row['left_id']} ORDER BY left_id ASC");
				$result = $db->sql_query_limit($sql, 1);

				if (!($row = $db->sql_fetchrow($result)))
				{
					// already on top or at bottom
					break;
				}
				$db->sql_freeresult($result);

				$module_info[$row['module_id']] = $row;

				if ($action == 'move_up')
				{
					$up_id = $module_id;
					$down_id = $row['module_id'];
				}
				else
				{
					$up_id = $row['module_id'];
					$down_id = $module_id;
				}

				$move_module_name = $this->lang_name($row['module_langname']);
				$diff_up = $module_info[$up_id]['right_id'] - $module_info[$up_id]['left_id'];
				$diff_down = $module_info[$down_id]['right_id'] - $module_info[$down_id]['left_id'];

				$ids = array();
		
				$sql = 'SELECT module_id
					FROM ' . MODULES_TABLE . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND left_id > " . $module_info[$up_id]['left_id'] . '
						AND right_id < ' . $module_info[$up_id]['right_id'];
				$result = $db->sql_query($sql);

				while ($row = $db->sql_fetchrow($result))
				{
					$ids[] = $row['module_id'];
				}
				$db->sql_freeresult($result);

				// Start transaction
				$db->sql_transaction('begin');

				$sql = 'UPDATE ' . MODULES_TABLE . '
					SET left_id = left_id + ' . ($diff_up + 1) . ', right_id = right_id + ' . ($diff_up + 1) . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND left_id > " . $module_info[$down_id]['left_id'] . '
						AND right_id < ' . $module_info[$down_id]['right_id'];
				$db->sql_query($sql);

				if (sizeof($ids))
				{
					$sql = 'UPDATE ' . MODULES_TABLE . '
						SET left_id = left_id - ' . ($diff_down + 1) . ', right_id = right_id - ' . ($diff_down + 1) . "
						WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
							AND module_id IN (" . implode(', ', $ids) . ')';
					$db->sql_query($sql);
				}

				$sql = 'UPDATE ' . MODULES_TABLE . '
					SET left_id = ' . $module_info[$down_id]['left_id'] . ', right_id = ' . ($module_info[$down_id]['left_id'] + $diff_up) . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND module_id = $up_id";
				$db->sql_query($sql);

				$sql = 'UPDATE ' . MODULES_TABLE . '
					SET left_id = ' . ($module_info[$up_id]['right_id'] - $diff_down) . ', right_id = ' . $module_info[$up_id]['right_id'] . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND module_id = $down_id";
				$db->sql_query($sql);

				$db->sql_transaction('commit');

				add_log('admin', 'LOG_MODULE_' . strtoupper($action), $move_module_name);

				// recalculate binary tree
				recalc_btree('module_id', MODULES_TABLE, $this->module_class);
				$this->remove_cache_file();
		
			break;

			case 'quickadd':
				$quick_install = request_var('quick_install', '');

				if (confirm_box(true))
				{
					if (!$quick_install || strpos($quick_install, '::') === false)
					{
						break;
					}

					list($module_name, $module_mode) = explode('::', $quick_install);

					// Check if module name and mode exist...
					$fileinfo = $this->get_module_infos($module_name);
					$fileinfo = $fileinfo[$module_name];

					if (isset($fileinfo['modes'][$module_mode]))
					{
						$module_data = array(
							'module_name'		=> $module_name,
							'module_enabled'	=> 0,
							'module_display'	=> (isset($fileinfo['modes'][$module_mode]['display'])) ? $fileinfo['modes'][$module_mode]['display'] : 1,
							'parent_id'			=> $parent_id,
							'module_class'		=> $this->module_class,
							'module_langname'	=> $fileinfo['modes'][$module_mode]['title'],
							'module_mode'		=> $module_mode,
							'module_auth'		=> $fileinfo['modes'][$module_mode]['auth'],
						);

						$errors = $this->update_module_data($module_data);

						if (!sizeof($errors))
						{
							// recalculate binary tree
							recalc_btree('module_id', MODULES_TABLE, $this->module_class);
							$this->remove_cache_file();
	
							trigger_error($user->lang['MODULE_ADDED'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
						}
					}
				}
				else
				{
					confirm_box(false, 'ADD_MODULE', build_hidden_fields(array(
						'i'			=> $id,
						'mode'		=> $mode,
						'parent_id'	=> $parent_id,
						'action'	=> 'quickadd',
						'quick_install'	=> $quick_install,
					)));
				}

			break;

			case 'edit':

				if (!$module_id)
				{
					trigger_error($user->lang['NO_MODULE_ID'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
				}
				
				$module_row = $this->get_module_row($module_id);

			// no break

			case 'add':

				if ($action == 'add')
				{
					$module_row = array(
						'module_name'		=> '',
						'module_enabled'	=> 0,
						'module_display'	=> 1,
						'parent_id'			=> 0,
						'module_langname'	=> request_var('module_langname', ''),
						'module_mode'		=> '',
						'module_auth'		=> '',
					);
				}
				
				$module_data = array();

				$module_data['module_name'] = request_var('module_name', (string) $module_row['module_name']);
				$module_data['module_enabled'] = request_var('module_enabled', (int) $module_row['module_enabled']);
				$module_data['module_display'] = request_var('module_display', (int) $module_row['module_display']);
				$module_data['parent_id'] = request_var('module_parent_id', (int) $module_row['parent_id']);
				$module_data['module_class'] = $this->module_class;
				$module_data['module_langname'] = request_var('module_langname', (string) $module_row['module_langname']);
				$module_data['module_mode'] = request_var('module_mode', (string) $module_row['module_mode']);

				$submit = (isset($_POST['submit'])) ? true : false;

				if ($submit)
				{
					if (!$module_data['module_langname'])
					{
						trigger_error($user->lang['NO_MODULE_LANGNAME'] . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
					}

					$module_type = request_var('module_type', 'category');

					if ($module_type == 'category')
					{
						$module_data['module_name'] = $module_data['module_mode'] = $module_data['module_auth'] = '';
						$module_data['module_display'] = 1;
					}

					if ($action == 'edit')
					{
						$module_data['module_id'] = $module_id;
					}

					// Adjust auth row
					if ($module_data['module_name'] && $module_data['module_mode'])
					{
						$fileinfo = $this->get_module_infos($module_data['module_name']);
						$module_data['module_auth'] = $fileinfo[$module_data['module_name']]['modes'][$module_data['module_mode']]['auth'];
					}

					$errors = $this->update_module_data($module_data);

					if (!sizeof($errors))
					{
						// recalculate binary tree
						recalc_btree('module_id', MODULES_TABLE, $this->module_class);
						$this->remove_cache_file();
	
						trigger_error((($action == 'add') ? $user->lang['MODULE_ADDED'] : $user->lang['MODULE_EDITED']) . adm_back_link($u_action . '&amp;parent_id=' . $parent_id));
					}
				}

				// Category/not category?
				$is_cat = (!$module_data['module_name']) ? true : false;

				// Get module informations
				$module_infos = $this->get_module_infos();

				// Build name options
				$s_name_options = $s_mode_options = '';
				foreach ($module_infos as $option => $values)
				{
					if (!$module_data['module_name'])
					{
						$module_data['module_name'] = $option;
					}

					// Name options
					$s_name_options .= '<option value="' . $option . '"' . (($option == $module_data['module_name']) ? ' selected="selected"' : '') . '>' . $this->lang_name($values['title']) . ' [' . $this->module_class . '_' . $option . ']</option>';

					$template->assign_block_vars('m_names', array('NAME' => str_replace("'", "\'", stripslashes($option))));

					// Build module modes
					foreach ($values['modes'] as $m_mode => $m_values)
					{
						if ($option == $module_data['module_name'])
						{
							$s_mode_options .= '<option value="' . $m_mode . '"' . (($m_mode == $module_data['module_mode']) ? ' selected="selected"' : '') . '>' . $this->lang_name($m_values['title']) . '</option>';
						}
						
						$template->assign_block_vars('m_names.modes', array(
							'OPTION'		=> str_replace("'", "\'", stripslashes($m_mode)),
							'VALUE'			=> str_replace("'", "\'", stripslashes($this->lang_name($m_values['title']))))
						);
					}
				}
				
				$s_cat_option = '<option value="0"' . (($module_data['parent_id'] == 0) ? ' selected="selected"' : '') . '>' . $user->lang['NO_PARENT'] . '</option>';

				$template->assign_vars(array_merge(array(
					'S_EDIT_MODULE'		=> true,
					'S_IS_CAT'			=> $is_cat,
					'S_CAT_OPTIONS'		=> $s_cat_option . $this->make_module_select($module_data['parent_id'], ($action == 'edit') ? $module_row['module_id'] : false, false, false, false, true),
					'S_MODULE_NAMES'	=> $s_name_options,
					'S_MODULE_MODES'	=> $s_mode_options,
					'U_BACK'			=> $u_action . '&amp;parent_id=' . $parent_id,
					'U_EDIT_ACTION'		=> $u_action . '&amp;parent_id=' . $parent_id,

					'L_TITLE'			=> $user->lang[strtoupper($action) . '_MODULE'],
					
					'MODULENAME'		=> $this->lang_name($module_data['module_langname']),
					'ACTION'			=> $action,
					'MODULE_ID'			=> $module_id,

				), 
					array_change_key_case($module_data, CASE_UPPER))
				);

				if (sizeof($errors))
				{
					$template->assign_vars(array(
						'S_ERROR'	=> true,
						'ERROR_MSG'	=> implode('<br />', $errors))
					);
				}

				return;

			break;
		}

		// Default management page
		if (sizeof($errors))
		{
			$template->assign_vars(array(
				'S_ERROR'	=> true,
				'ERROR_MSG'	=> implode('<br />', $errors))
			);
		}

		if (!$parent_id)
		{
			$navigation = strtoupper($this->module_class);
		}
		else
		{
			$navigation = '<a href="' . $u_action . '">' . strtoupper($this->module_class) . '</a>';

			$modules_nav = $this->get_module_branch($parent_id, 'parents', 'descending');
			foreach ($modules_nav as $row)
			{
				$langname = $this->lang_name($row['module_langname']);

				if ($row['module_id'] == $parent_id)
				{
					$navigation .= ' -&gt; ' . $langname;
				}
				else
				{
					$navigation .= ' -&gt; <a href="' . $u_action . '&amp;parent_id=' . $row['module_id'] . '">' . $langname . '</a>';
				}
			}
		}

		// Jumpbox
		$module_box = $this->make_module_select($parent_id, false, false, false, false);

		$sql = 'SELECT *
			FROM ' . MODULES_TABLE . "
			WHERE parent_id = $parent_id
				AND module_class = '" . $db->sql_escape($this->module_class) . "'
			ORDER BY left_id";
		$result = $db->sql_query($sql);

		if ($row = $db->sql_fetchrow($result))
		{
			do
			{
				$langname = $this->lang_name($row['module_langname']);

				if (!$row['module_enabled'])
				{
					$module_image = '<img src="images/icon_folder_lock.gif" width="46" height="25" alt="' . $user->lang['DEACTIVATED_MODULE'] .'" />';
				}
				else
				{
					$module_image = (!$row['module_name'] || $row['left_id'] + 1 != $row['right_id']) ? '<img src="images/icon_subfolder.gif" width="46" height="25" alt="' . $user->lang['CATEGORY'] . '" />' : '<img src="images/icon_folder.gif" width="46" height="25" alt="' . $user->lang['MODULE'] . '" />';
				}

				$url = $u_action . '&amp;parent_id=' . $parent_id . '&amp;m=' . $row['module_id'];
	
				$template->assign_block_vars('modules', array(
					'MODULE_IMAGE'		=> $module_image,
					'MODULE_TITLE'		=> $langname,
					'MODULE_ENABLED'	=> ($row['module_enabled']) ? true : false,
					'MODULE_DISPLAYED'	=> ($row['module_display']) ? true : false,

					'U_MODULE'			=> $u_action . '&amp;parent_id=' . $row['module_id'],
					'U_MOVE_UP'			=> $url . '&amp;action=move_up',
					'U_MOVE_DOWN'		=> $url . '&amp;action=move_down',
					'U_EDIT'			=> $url . '&amp;action=edit',
					'U_DELETE'			=> $url . '&amp;action=delete',
					'U_ENABLE'			=> $url . '&amp;action=enable',
					'U_DISABLE'			=> $url . '&amp;action=disable')
				);
			}
			while ($row = $db->sql_fetchrow($result));
		}
		else if ($parent_id)
		{
			$row = $this->get_module_row($parent_id);

			$url = $u_action . '&amp;parent_id=' . $parent_id . '&amp;m=' . $row['module_id'];

			$template->assign_vars(array(
				'S_NO_MODULES'		=> true,

				'U_EDIT'			=> $url . '&amp;action=edit',
				'U_DELETE'			=> $url . '&amp;action=delete',
				'U_ENABLE'			=> $url . '&amp;action=enable',
				'U_DISABLE'			=> $url . '&amp;action=disable')
			);
		}
		$db->sql_freeresult($result);

		// Quick adding module
		$module_infos = $this->get_module_infos();

		// Build quick options
		$s_install_options = '';
		foreach ($module_infos as $option => $values)
		{
			// Name options
			$s_install_options .= '<optgroup label="' . $this->lang_name($values['title']) . ' [' . $this->module_class . '_' . $option . ']">';

			// Build module modes
			foreach ($values['modes'] as $m_mode => $m_values)
			{
				$s_install_options .= '<option value="' . $option . '::' . $m_mode . '">&nbsp; &nbsp;' . $this->lang_name($m_values['title']) . '</option>';
			}

			$s_install_options .= '</optgroup>';
		}

		$template->assign_vars(array(
			'U_SEL_ACTION'	=> $u_action,
			'U_ACTION'		=> $u_action . '&amp;parent_id=' . $parent_id,
			'NAVIGATION'	=> $navigation,
			'MODULE_BOX'	=> $module_box,
			'PARENT_ID'		=> $parent_id,
			'S_INSTALL_OPTIONS'	=> $s_install_options,
			)
		);
	}

	/**
	* Get row for specified module
	*/
	function get_module_row($module_id)
	{
		global $db, $user;

		$sql = 'SELECT *
			FROM ' . MODULES_TABLE . "
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND module_id = $module_id";
		$result = $db->sql_query($sql);
		$row = $db->sql_fetchrow($result);
		$db->sql_freeresult($result);
		
		if (!$row)
		{
			trigger_error($user->lang['NO_MODULE']);
		}

		return $row;
	}
	
	/**
	* Get available module informations from module files
	*/
	function get_module_infos($module = '')
	{
		global $phpbb_root_path, $phpEx;
		
		$directory = $phpbb_root_path . 'includes/' . $this->module_class . '/';
		
		$fileinfo = array();

		if (!$module)
		{
			$dh = opendir($directory);
			while ($file = readdir($dh))
			{
				// Is module?
				if (preg_match('/^' . $this->module_class . '_.+\.' . $phpEx . '$/', $file))
				{
					$class = str_replace(".$phpEx", '', $file) . '_info';

					// Do not include current working file ;)
					if (!class_exists($class))
					{
						include($directory . $file);
					}

					// Get module title tag
					if (class_exists($class))
					{
						$c_class = new $class();
						$module_info = $c_class->module();
						$fileinfo[str_replace($this->module_class . '_', '', $module_info['filename'])] = $module_info;
					}
				}
			}
			closedir($dh);

			ksort($fileinfo);
		}
		else
		{
			$filename = $this->module_class . '_' . basename($module);
			$class = $this->module_class . '_' . basename($module) . '_info';

			// Do not include current working file ;)
			if (!class_exists($class))
			{
				include($directory . $filename . '.' . $phpEx);
			}

			// Get module title tag
			if (class_exists($class))
			{
				$c_class = new $class();
				$module_info = $c_class->module();
				$fileinfo[str_replace($this->module_class . '_', '', $module_info['filename'])] = $module_info;
			}
		}
		
		return $fileinfo;
	}

	/**
	* Simple version of jumpbox, just lists modules
	*/
	function make_module_select($select_id = false, $ignore_id = false, $ignore_acl = false, $ignore_nonpost = false, $ignore_emptycat = true, $ignore_noncat = false)
	{
		global $db, $user, $auth, $config;

		$sql = 'SELECT module_id, module_enabled, module_name, parent_id, module_langname, left_id, right_id, module_auth
			FROM ' . MODULES_TABLE . "
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
			ORDER BY left_id ASC";
		$result = $db->sql_query($sql);

		$right = $iteration = 0;
		$padding_store = array('0' => '');
		$module_list = $padding = '';

		while ($row = $db->sql_fetchrow($result))
		{
			if ($row['left_id'] < $right)
			{
				$padding .= '&nbsp; &nbsp;';
				$padding_store[$row['parent_id']] = $padding;
			}
			else if ($row['left_id'] > $right + 1)
			{
				$padding = (isset($padding_store[$row['parent_id']])) ? $padding_store[$row['parent_id']] : '';
			}

			$right = $row['right_id'];

			/**
			* @todo think about using module class here
			*/
			if (!$ignore_acl && $row['module_auth'])
			{
				$is_auth = false;
				eval('$is_auth = (int) (' . preg_replace(array('#acl_([a-z_]+)(,\$id)?#e', '#\$id#', '#cfg_([a-z_]+)#e'), array('(int) $auth->acl_get("\\1"\\2)', '$this->acl_forup_id', '(int) $config["\\1"]'), trim($row['module_auth'])) . ');');
				if (!$is_auth)
				{
					continue;
				}
			}

			// ignore this module?
			if ((is_array($ignore_id) && in_array($row['module_id'], $ignore_id)) || $row['module_id'] == $ignore_id)
			{
				continue;
			}

			// empty category
			if (!$row['module_name'] && ($row['left_id'] + 1 == $row['right_id']) && $ignore_emptycat)
			{
				continue;
			}

			// ignore non-category?
			if ($row['module_name'] && $ignore_noncat)
			{
				continue;
			}

			$selected = (is_array($select_id)) ? ((in_array($row['module_id'], $select_id)) ? ' selected="selected"' : '') : (($row['module_id'] == $select_id) ? ' selected="selected"' : '');

			$langname = $this->lang_name($row['module_langname']);
			$module_list .= '<option value="' . $row['module_id'] . '"' . $selected . ((!$row['module_enabled']) ? ' class="disabled"' : '') . '>' . $padding . $langname . '</option>';

			$iteration++;
		}
		unset($padding_store);

		return $module_list;
	}

	/**
	* Get module branch
	*/
	function get_module_branch($module_id, $type = 'all', $order = 'descending', $include_module = true)
	{
		global $db;

		switch ($type)
		{
			case 'parents':
				$condition = 'm1.left_id BETWEEN m2.left_id AND m2.right_id';
			break;

			case 'children':
				$condition = 'm2.left_id BETWEEN m1.left_id AND m1.right_id';
			break;

			default:
				$condition = 'm2.left_id BETWEEN m1.left_id AND m1.right_id OR m1.left_id BETWEEN m2.left_id AND m2.right_id';
		}

		$rows = array();

		$sql = 'SELECT m2.*
			FROM ' . MODULES_TABLE . ' m1
			LEFT JOIN ' . MODULES_TABLE . " m2 ON ($condition)
			WHERE m1.module_class = '" . $db->sql_escape($this->module_class) . "'
				AND m2.module_class = '" . $db->sql_escape($this->module_class) . "'
				AND m1.module_id = $module_id
			ORDER BY m2.left_id " . (($order == 'descending') ? 'ASC' : 'DESC');
		$result = $db->sql_query($sql);

		while ($row = $db->sql_fetchrow($result))
		{
			if (!$include_module && $row['module_id'] == $module_id)
			{
				continue;
			}

			$rows[] = $row;
		}
		$db->sql_freeresult($result);

		return $rows;
	}

	/**
	* Remove modules cache file
	*/
	function remove_cache_file()
	{
		global $phpbb_root_path, $phpEx;

		// Sanitise for future path use, it's escaped as appropriate for queries
		$p_class = str_replace(array('.', '/', '\\'), '', basename($this->module_class));
		
		if (file_exists($phpbb_root_path . 'cache/' . $p_class . '_modules.' . $phpEx))
		{
			@unlink($phpbb_root_path . 'cache/' . $p_class . '_modules.' . $phpEx);
		}
	}

	/**
	* Return correct language name
	*/
	function lang_name($module_langname)
	{
		global $user;

		return (!empty($user->lang[$module_langname])) ? $user->lang[$module_langname] : $module_langname;
	}

	/**
	* Update/Add module
	*/
	function update_module_data(&$module_data)
	{
		global $db, $user;

		if (!isset($module_data['module_id']))
		{
			// no module_id means we're creating a new category/module

			$db->sql_transaction('begin');

			if ($module_data['parent_id'])
			{
				$sql = 'SELECT left_id, right_id
					FROM ' . MODULES_TABLE . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND module_id = {$module_data['parent_id']}";
				$result = $db->sql_query($sql);

				if (!$row = $db->sql_fetchrow($result))
				{
					trigger_error($user->lang['PARENT_NO_EXIST']);
				}
				$db->sql_freeresult($result);

				$sql = 'UPDATE ' . MODULES_TABLE . "
					SET left_id = left_id + 2, right_id = right_id + 2
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND left_id > {$row['right_id']}";
				$db->sql_query($sql);

				$sql = 'UPDATE ' . MODULES_TABLE . "
					SET right_id = right_id + 2
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
						AND {$row['left_id']} BETWEEN left_id AND right_id";
				$db->sql_query($sql);

				$module_data['left_id'] = $row['right_id'];
				$module_data['right_id'] = $row['right_id'] + 1;
			}
			else
			{
				$sql = 'SELECT MAX(right_id) AS right_id
					FROM ' . MODULES_TABLE . "
					WHERE module_class = '" . $db->sql_escape($this->module_class) . "'";
				$result = $db->sql_query($sql);
				$row = $db->sql_fetchrow($result);
				$db->sql_freeresult($result);

				$module_data['left_id'] = $row['right_id'] + 1;
				$module_data['right_id'] = $row['right_id'] + 2;
			}

			$sql = 'INSERT INTO ' . MODULES_TABLE . ' ' . $db->sql_build_array('INSERT', $module_data);
			$db->sql_query($sql);
		
			$db->sql_transaction('commit');

			$module_data['module_id'] = $db->sql_nextid();
			add_log('admin', 'LOG_MODULE_ADD', $this->lang_name($module_data['module_langname']));
		}
		else
		{
			$row = $this->get_module_row($module_data['module_id']);

			if ($module_data['module_name'] && !$row['module_name'])
			{
				// we're turning a category into a module
				$branch = $this->get_module_branch($module_data['module_id'], 'children', 'descending', false);

				if (sizeof($branch))
				{
					return array($user->lang['NO_CATEGORY_TO_MODULE']);
				}
			}

			if ($row['parent_id'] != $module_data['parent_id'])
			{
				$this->move_module($module_data['module_id'], $module_data['parent_id']);
			}
		
			$sql = 'UPDATE ' . MODULES_TABLE . '
				SET ' . $db->sql_build_array('UPDATE', $module_data) . "
				WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
					AND module_id = {$module_data['module_id']}";
			$db->sql_query($sql);

			add_log('admin', 'LOG_MODULE_EDIT', $this->lang_name($module_data['module_langname']));
		}

		return array();
	}

	/**
	* Move module around the tree
	*/
	function move_module($from_module_id, $to_parent_id)
	{
		global $db;

		$moved_modules = $this->get_module_branch($from_module_id, 'children', 'descending');
		$from_data = $moved_modules[0];
		$diff = sizeof($moved_modules) * 2;

		$moved_ids = array();
		for ($i = 0; $i < sizeof($moved_modules); ++$i)
		{
			$moved_ids[] = $moved_modules[$i]['module_id'];
		}

		// Resync parents
		$sql = 'UPDATE ' . MODULES_TABLE . "
			SET right_id = right_id - $diff
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND left_id < " . $from_data['right_id'] . "
				AND right_id > " . $from_data['right_id'];
		$db->sql_query($sql);

		// Resync righthand side of tree
		$sql = 'UPDATE ' . MODULES_TABLE . "
			SET left_id = left_id - $diff, right_id = right_id - $diff
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND left_id > " . $from_data['right_id'];
		$db->sql_query($sql);

		if ($to_parent_id > 0)
		{
			$to_data = $this->get_module_row($to_parent_id);

			// Resync new parents
			$sql = 'UPDATE ' . MODULES_TABLE . "
				SET right_id = right_id + $diff
				WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
					AND " . $to_data['right_id'] . ' BETWEEN left_id AND right_id
					AND module_id NOT IN (' . implode(', ', $moved_ids) . ')';
			$db->sql_query($sql);

			// Resync the righthand side of the tree
			$sql = 'UPDATE ' . MODULES_TABLE . "
				SET left_id = left_id + $diff, right_id = right_id + $diff
				WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
					AND left_id > " . $to_data['right_id'] . '
					AND module_id NOT IN (' . implode(', ', $moved_ids) . ')';
			$db->sql_query($sql);

			// Resync moved branch
			$to_data['right_id'] += $diff;
			if ($to_data['right_id'] > $from_data['right_id'])
			{
				$diff = '+ ' . ($to_data['right_id'] - $from_data['right_id'] - 1);
			}
			else
			{
				$diff = '- ' . abs($to_data['right_id'] - $from_data['right_id'] - 1);
			}
		}
		else
		{
			$sql = 'SELECT MAX(right_id) AS right_id
				FROM ' . MODULES_TABLE . "
				WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
					AND module_id NOT IN (" . implode(', ', $moved_ids) . ')';
			$result = $db->sql_query($sql);
			$row = $db->sql_fetchrow($result);
			$db->sql_freeresult($result);

			$diff = '+ ' . ($row['right_id'] - $from_data['left_id'] + 1);
		}

		$sql = 'UPDATE ' . MODULES_TABLE . "
			SET left_id = left_id $diff, right_id = right_id $diff
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND module_id IN (" . implode(', ', $moved_ids) . ')';
		$db->sql_query($sql);
	}

	/**
	* Remove module from tree
	*/
	function delete_module($module_id)
	{
		global $db, $user;

		$row = $this->get_module_row($module_id);

		$branch = $this->get_module_branch($module_id, 'children', 'descending', false);

		if (sizeof($branch))
		{
			return array($user->lang['CANNOT_REMOVE_MODULE']);
		}

		// If not move
		$diff = 2;
		$sql = 'DELETE FROM ' . MODULES_TABLE . "
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND module_id = $module_id";
		$db->sql_query($sql);

		// Resync tree
		$sql = 'UPDATE ' . MODULES_TABLE . "
			SET right_id = right_id - $diff
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND left_id < {$row['right_id']} AND right_id > {$row['right_id']}";
		$db->sql_query($sql);

		$sql = 'UPDATE ' . MODULES_TABLE . "
			SET left_id = left_id - $diff, right_id = right_id - $diff
			WHERE module_class = '" . $db->sql_escape($this->module_class) . "'
				AND left_id > {$row['right_id']}";
		$db->sql_query($sql);

		add_log('admin', 'LOG_MODULE_REMOVED', $this->lang_name($row['module_langname']));

		return array();

	}
}

/**
* @package module_install
*/
class acp_modules_info
{
	function module()
	{
		return array(
			'filename'	=> 'acp_modules',
			'title'		=> 'ACP_MODULE_MANAGEMENT',
			'version'	=> '1.0.0',
			'modes'		=> array(
				'acp'		=> array('title' => 'ACP', 'auth' => 'acl_a_modules'),
				'ucp'		=> array('title' => 'UCP', 'auth' => 'acl_a_modules'),
				'mcp'		=> array('title' => 'MCP', 'auth' => 'acl_a_modules'),
			),
		);
	}

	function install()
	{
	}

	function uninstall()
	{
	}
}

?>