<?php
/**
 * Virtual File System: Explorer
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage vfs
 */

WBClass::load('WBVFS');

/**
 * Virtual File System: Explorer
 *
 *
 *
 * @version 0.5.1
 * @package WB
 * @subpackage vfs
 */
class WBVFS_Explorer extends WBVFS
{
    /**
     * acces to database
     * @var WBDatasource_Table
     */
    protected $table;

    /**
     * acces to tree
     * @var WBDatasource_Tree
     */
    protected $tree;

    /**
     * utility file object
     *
     * @var WBVFS_File
     */
    protected $file;

    /**
     * direcory parameter
     * @var unknown_type
     */
    protected $paramDir = array(
                            'treetable'     =>  'vfsdir',
                            'treecolumn'    =>  'path',
                            'alphalength'   =>  4,
                            'casesensitive' =>  0
                        );

    protected $clause   =   array();

    /**
     * constructor
     *
     * Standard constructor
     *
     * @param array $parameter
     */
    public function __construct($parameter = array())
    {
        parent::__construct();

        // load config and merge with default
        $config =   WBClass::create('WBConfig');
        $config->load('vfs');
        $this->paramDir =   array_merge($this->paramDir, $config->get('dir', array()));
        if (isset($parameter['chroot']) && !empty($parameter['chroot'])) {
            $this->paramDir['chroot']   =   $parameter['chroot'];
        }

        $this->table    =   WBClass::create('WBDatasource_Table', $this->paramDir);
        $this->tree     =   WBClass::create('WBDatasource_Tree', $this->paramDir);
        $this->file     =   WBClass::create('WBVFS_File', $parameter);

        $this->table->switchTranslation(false);
        $this->tree->switchTranslation(false);

        $uPrimary   =   $this->table->getIdentifier('user');
        if (isset($parameter['user'])) {
            $this->clause   = array();
            $this->clause[] =   array(
                                'field' =>  $uPrimary,
                                'value' =>  $parameter['user']
                            );
            $skel   =   array(
                            $uPrimary   =>  $parameter['user']
                        );
            $this->tree->setSkeleton($skel);
        }

        /*
        if (isset($parameter['chroot']) && 0 < $parameter['chroot']) {
            $chroot =   $this->tree->get($parameter['chroot']);
            $this->clause[] =   array(
                                        'field'     =>  $this->paramDir['treecolumn'],
                                        'relation'  =>  'begins',
                                        'value'     =>  $chroot[$this->paramDir['treecolumn']]
                                    );
        }
        */

        $this->tree->setClause($this->clause);

    }


    /**
     * Actually switch translation
     *
     * @param bool $switch
     */
    protected function doSwitchTranslation($switch)
    {
        $this->table->switchTranslation($switch);
        $this->tree->switchTranslation($switch);
    }

    /**
     * trim folder name
     *
     * auxillary function to trim name and remove "/" characters.
     *
     * @param string $name
     * @param bool replace slashes
     * @return string
     */
    public function trim($name, $replace = true)
    {
        $name   =   trim($name, '/ ');
        if (!$replace) {
            return $name;
        }
        return str_replace('/', '_', $name);
    }

    /**
     * adaptor to get primary key of directories
     *
     * Fetch column name of primary key, if any
     *
     * @see WBDatasource_Tree::getIdentifier()
     * @return string
     */
    public function getDirIdentifier()
    {
        return $this->tree->getIdentifier();
    }

    /**
     * adaptor to get primary key of files
     *
     * Fetch column name of fake primary key: obscureid
     *
     * @see WBDatasource_Table::getIdentifier()
     * @return string
     */
    public function getFileIdentifier()
    {
        return 'obscureid';
    }

    /**
     * load file by obscure
     *
     * @param string $obscureId
     * @return WBVFS_File|array
     */
    public function getFileByObscureId($obscureId, $object = true)
    {
        $res    =   $this->file->loadByObscureId($obscureId);
        if ($object) {
            return $res;
        }

        $info   =   $res->getInfo();
        return $info;
    }

    /**
     * load file by obscure
     *
     * @param string $obscureId
     * @return WBVFS_File|array
     */
    public function getFileById($id, $object = true)
    {
        $res    =   $this->file->loadById($id);
        if ($object) {
            return $res;
        }

        $info   =   $res->getInfo();
        return $info;
    }

    /**
     * find node using path
     *
     * Allow access to folders using path like "/foo/bar/blah"
     *
     * @param string|array $path
     * @return string|null
     */
    public function findPath($path)
    {
        if (!is_array($path)) {
            $path   =   $this->trim($path, false);
            if (empty($path)) {
                return null;
            }
            $path   =   explode('/', $path);
        }

        if (empty($path)) {
            return null;
        }

        // find first part of path in db
        $clause     =   $this->clause;
        $clause[]   =   array(
                            'field' =>  'name',
                            'value' =>  array_shift($path)
                            );

        $inRoot     =   $this->table->get($this->paramDir['treetable'], null, null, $clause);
        if (!is_array($inRoot)) {
            return null;
        }

        // get parameter
        $pCol       =   $this->paramDir['treecolumn'];
        $pLen       =   $this->paramDir['alphalength'];

        $parent     =   null;
        foreach ($inRoot as $parent) {
            if (strlen($parent[$pCol]) == $pLen) {
                break;
            }
        }
        if (!$parent) {
            return null;
        }
        unset($inRoot);

        $primary    =   $this->tree->getIdentifier();
        $id         =   $parent[$primary];
        if (empty($path)) {
            return $id;
        }

        // select all children
        $children   =   $this->tree->getChildren($id, 0);

        // dig down path
        $ids    =   array();
        foreach ($path as $i => $p) {
            foreach ($children as $child) {
                if ($child['name'] == $p && ($i + 2) * $pLen == strlen($child[$pCol])) {
                    $ids[]  =   $child[$primary];
                    break;
                }
            }
        }

        // verify found names all along path
        if (count($ids) != count($path)) {
            return null;
        }
        return array_pop($ids);
    }

    /**
     * get path to dir
     *
     * Fetch all parent nodes to return path
     *
     * @param string $dir
     * @param bool $string tell whether to return string
     * @return array|string
     */
    public function getPath($dir, $string = false)
    {
        if (empty($dir)) {
            if ($string) {
                return '';
            }
            return array();
        }

        $current    =   $this->tree->get($dir);
        if (empty($current)) {
            return null;
        }

        $path   =   array();
        $list   =   $this->tree->getParent($dir, 0);
        if (is_array($list)) {
            foreach ($list as $l) {
                $path[] =   $l['name'];
            }
        }

        $path[] =   $current['name'];
        if ($string) {
            $path   =   implode('/', $path);
        }
        return $path;
    }

    /**
     * make new folder
     *
     * Similar to mkdir
     *
     * @param string|null $parent id of parent not, or null for root
     * @param string $name folder name
     * @return string $key of new record
     */
    public function mkDir($parent, $name)
    {
        // make sure new name is unique
        $siblings   =   $this->tree->getChildren($parent);
        $name       =   $this->makeUniqueName($name, $siblings);

        $new    =   array(
                        'name'  =>  $name
                    );
        return $this->tree->addChild($parent, $new);
    }

    /**
     * get direcotry node
     *
     * Fetch direcotry's node data by id
     *
     * @see WBDatasource_Tree::get()
     * @param string $id
     * @return array
     */
    public function getDir($id)
    {
        $node   =   $this->tree->get($id);
        if ($id === null || !isset($node['name'])) {
            $node['name']   =   '';
        }
        return $node;
    }

    /**
     * get all parent folders
     *
     * @param string $id
     * @return array
     */
    public function getParent($id)
    {
        return $this->tree->getParent($id, 0);
    }

    /**
     * fetch parent node
     *
     * In case the parent is root node, it will return null
     *
     * @param string $id
     * @return array
     */
    public function getParentDir($id)
    {
        $list   =   $this->tree->getParent($id);
        if (count($list) == 1) {
            return $list[0];
        }

        return null;
    }

    /**
     * get id of parent dir
     *
     * @see getParentDir()
     * @param string $id
     * @return string
     */
    public function getParentDirId($id)
    {
        $dir    =   $this->getParentDir($id);
        if (is_array($dir)) {
            return $dir[$this->getDirIdentifier()];
        }
        return null;
    }

    /**
     * directory listing
     *
     * @param string $id
     * @param int $depth
     * @return array
     */
    public function lsDir($id, $depth = 1)
    {
        if ($id == 0) {
            $id    =   null;
        }
        return $this->tree->getChildren($id, $depth);
    }

    /**
     * remove folder recursively
     *
     * @param string $id
     */
    public function rmDir($id)
    {
        if ($id == 0) {
            $id =   null;
        }

        $node       =   $this->tree->get($id);
        $children   =   $this->tree->getChildren($node, 0);

        // remove all files
        $children[] =   $node;
        foreach ($children as $child) {
            $dir    =   $child[$this->getDirIdentifier()];
            $files  =   $this->file->listDir($dir);

            foreach ($files as $f) {
                $file   =   $this->getFileById($f['id'], true);
                $file->delete();
            }
        }

        // remove all folders and subfolder
        $this->tree->delete($id);
        return true;
    }

    /**
     * rename an existing directory
     *
     * Allows you to rename dir withoud changing the id,
     * also duplicate names are avoided
     *
     * @see mvDir()
     * @param string $id
     * @param string $name
     * @return string id of changed node
     */
    public function renameDir($id, $name)
    {
        $node   =   $this->tree->get($id);
        if ($name == $node['name']) {
            return;
        }

        $primary    =   $this->getDirIdentifier();
        $parent     =   $this->tree->getParent($id);
        if (empty($parent)) {
            $parent =   array(array($primary => null));
        }
        $parent     =   array_shift($parent);
        $siblings   =   $this->tree->getChildren($parent[$primary]);

        $name   =   $this->makeUniqueName($name, $siblings, $id);
        $save   =   array(
                'name'  =>  $name
                );
        return $this->tree->set($id, $save);
    }

    /**
     * move directory
     *
     * Move folder's location. Optionally you may change the
     * folder's name on the go
     *
     * @param string $id node to move
     * @param string $des destination node's id
     * @param string $name optional new name
     * @return string id of moved node
     */
    public function mvDir($id, $des, $name = null)
    {
        $node           =   array();
        if (!empty($name)) {
            $node['name']   =   $name;
        }
        else {
            // fetch old name
            $old            =   $this->tree->get($id);
            $node['name']   =   $old['name'];
        }

        $siblings       =   $this->tree->getChildren($des);
        $node['name']   =   $this->makeUniqueName($node['name'], $siblings);

        return $this->tree->moveChild($id, $des, $node);
    }
}