<?php
/**
 * User Storage module Table
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage content
 */

/**
 * Load classes
 */
WBClass::load('WBUser_Storage');

/**
 * User Storage module Table
 *
 * Load and save user data in database table
 *
 * @version 0.3.0
 * @package WB
 * @subpackage content
 */
class WBUser_Storage_Table extends WBUser_Storage
{
   /**
    * storage
    * @var WBDatasource_Table
    */
    protected $table;

    const TABLE_USER        =   'user';
    const TABLE_GROUP       =   'group';
    const TABLE_USERGROUP   =   'usergroup';

   /**
    * constructor
    *
    * @param array $parameter
    */
    public function __construct( $parameter )
    {
        parent::__construct($parameter);
        $this->table    =   WBClass::create('WBDatasource_Table', $parameter);
    }

    /**
     * find user
     *
     * @see isAuthenticated()
     * @param array anything to find user
     * @return string|null either the user id on success, or null
     */
    public function find($data)
    {
        // lookup user in DB
        $clause     =   array();
        //$clause[]   =   array('field' => 'approved', 'value' => 1);
        //$clause[]   =   array('field' => 'enabled', 'value' => 1);

        // load by id
        if (isset($data['id'])) {
            return $this->load($data['id']);
        }

        if (isset($data['nickname'])) {
            $clause[]       =   array( 'field' => 'nickname', 'value' => $data['nickname'] );
        } else if (!isset($data['email'])) {
            $this->id       =   null;
            return null;
        } else {
            $email          =   explode('@', $data['email']);
            $domain         =   array_pop($email);
            $local          =   implode('@', $email);
            $clause[]       =   array('field' => 'emaillocal', 'value' => $local);
            $clause[]       =   array('field' => 'emaildomain', 'value' => $domain);
        }

        // fetch user data from table
        $user   =   $this->table->get(self::TABLE_USER, null, null, $clause);

        // user must exist and be unique
        if (count($user) != 1) {
            $this->id   =   null;
            return null;
        }
        $user       =   $user[0];
        $user['id'] =   $user[$this->table->getIdentifier(self::TABLE_USER)];
        $this->loadByRaw($user);

        return $this->id;
    }

   /**
    * Load User Data
    *
    * @param string $id user's id
    * @return true on success, false otherwise
    */
    public function load($id)
    {
        $user   =   $this->table->get(self::TABLE_USER, $id);

        if (count($user) != 1) {
            $this->id   =   null;
            return false;
        }

        $user       =   $user[0];
        $user['id'] =   $user[$this->table->getIdentifier(self::TABLE_USER)];
        $this->loadByRaw($user);
        return true;
    }

    /**
     * load user groups
     *
     * Load group ids and names from database and transform to
     * associative array
     *      groupid => groupname
     */
    protected function loadGroup()
    {
        $this->group    =   array();

        if (!$this->id){
            return;
        }

        $clause     =   array();
        $clause[]   =   array(
                        'field' =>  $this->table->getIdentifier(self::TABLE_USER),
                        'value' =>  $this->id
                        );

        $gprimary       =   $this->table->getIdentifier(self::TABLE_GROUP);
        $list           =   $this->table->get(self::TABLE_USERGROUP, null, null, $clause);

        // user is not in any group
        if (empty($list)) {
            return;
        }

        $gids   =   array();
        foreach ($list as $l) {
            $gids[] =   $l[$gprimary];
        }

        $clause     =   array();
        $clause[]   =   array(
                            'field'     =>  $gprimary,
                            'relation'  =>  'IN',
                            'value'     =>  $gids
                        );
        $list           =   $this->table->get(self::TABLE_GROUP, null, null, $clause);
        foreach ($list as $l) {
            $this->group[$l[$gprimary]] =   $l['groupname'];
        }
    }

   /**
    * update user data
    *
    * store changed user data in session and table
    *
    * @param array $data
    * @param bool $new whether to store a new user
    * @return string $id on success, null otherwise
    */
    public function set($data, $new = false)
    {
        $id = $this->id;
        if ($new) {
            $id = '__new';
        }

        if (!$id) {
            return null;
        }

        $save       =   array();
        if (isset($data['email'])) {
            $email                  =   explode('@', $data['email']);
            $save['emaildomain']    =   array_pop($email);
            $save['emaillocal']     =   implode('@', $email);
            unset($data['email']);
        }


        // password needs to be hashed
        $password   =   '';
        if (isset($data['password'])) {
            $password   =   $data['password'];
            unset($data['password']);
        }

        // save everything else
        foreach ($data as $key => $value) {
            // ignore values that have not changed
            if (!$new && $value == $this->data[$key]) {
                continue;
            }
            $save[$key] =   $value;
        }

        // leave nickname empty
        if ($new && !isset($data['nickname'])) {
            $save['nickname']   =   '';
        }

        // hash password
        if ($new) {
            $save['password']   =   'invalid_password';
        }
        else if (!empty($password)) {
            $save['password']   =   'overwrite passwort';
            $save['password']   =   $this->getPasswordHash($password, $save);
        }

        // nothing to save
        if (empty($save)) {
            return true;
        }

        // don't update changed column on every log in
        if (!$new && !empty($save['lastlogin'])) {
            $ts             =   $this->table->getTableInfo(self::TABLE_USER);
            $ts['changed']  = '';
            $ts             =   array(self::TABLE_USER => $ts);
            $this->table->setTables($ts);
        }

        // store in DB
        $newId   =   $this->table->save(self::TABLE_USER, $id, $save);
        if (!$newId) {
            return null;
        }

        foreach ($save as $k => $v) {
            $this->data[$k]    =   $v;
        }

        if (isset($save['emaillocal'])) {
            $this->data['email']    =   $save['emaillocal'] . '@' . $save['emaildomain'];
        }

        if ($new && !empty($password)) {
            $user       =   $this->table->get(self::TABLE_USER, $newId);
            $user       =   $user[0];
            $user['id'] =   $user[$this->table->getIdentifier(self::TABLE_USER)];
            $this->loadByRaw($user);

            $save = array('password' => '');
            $save['password']       =   $this->getPasswordHash($password, $save);
            $this->table->save(self::TABLE_USER, $newId, $save);
            $this->data['password'] =   $save['password'];
        }

        if ($new) {
            $this->id = $newId;
        }
        return $newId;
    }

    /**
     * save group membership
     *
     * @param array $groupIds
     */
    public function setGroups($groupIds)
    {
        if (!$this->id) {
            return;
        }

        $uPrimary   =   $this->table->getIdentifier(self::TABLE_USER);
        $clause     =   array();
        $clause[]   =   array(
                                'field' =>  $uPrimary,
                                'value' =>  $this->id
                            );
        $this->table->delete(self::TABLE_USERGROUP, null, null, $clause);

        // not member of any group
        if (empty($groupIds)) {
            $this->group    =   array();
            return;
        }

        // save new list of groups
        $gPrimary   =   $this->table->getIdentifier(self::TABLE_GROUP);
        $save   =   array();
        foreach ($groupIds as $gid) {
            $save[] =   array(
                                $uPrimary   =>  $this->id,
                                $gPrimary   =>  $gid
                            );
        }

        $this->table->save(self::TABLE_USERGROUP, '__new', $save);
        $this->loadGroup();
        return;
    }


    /**
     * Get Members of Groups
     *
     * Load user ids by group id(s)
     *
     * @param string|array $gid
     * @return array list of user ids
     */
    public function getIdByGroupId($gid)
    {
        if (empty($gid)) {
            return array();
        }
        if (!is_array($gid)) {
            $gid    =   array($gid);
        }

        $uPrimary   =   $this->table->getIdentifier(self::TABLE_USER);
        $gPrimary   =   $this->table->getIdentifier(self::TABLE_GROUP);

        $clause     =   array();
        $clause[]   =   array(
                                'field'     =>  $gPrimary,
                                'relation'  =>  'in',
                                'value'     =>  $gid
                            );
        $options    =   array(
                                'groupby'   =>  array('field' => $uPrimary)
                            );

        $list   =   $this->table->get(self::TABLE_USERGROUP, null, null, $clause, $options);
        $users  =   array();
        foreach ($list as $l) {
            $users[]    =   $l[$uPrimary];
        }
        return $users;
    }
}