<?php
/*
Plugin Name: WPVN - Username Changer
Plugin URI: http://link2caro.net/read/wpvn-username-changer/
Description: This plugin lets you <a href='users.php?page=wpvn_username_changer'>change user's login username</a>, especially useful if you need to change your admin username.
Version: 0.7.4
Author: Minh-Quan Tran (aka link2caro - a member of WordPressVN)
Author URI: http://link2caro.net/donate/

License GPL, please refer to the LICENSE file.
*/

if ( is_admin() && !class_exists('wpvn_username_changer') ) {

class wpvn_username_changer {

    private $level_can_use;

    function __construct(){
        load_plugin_textdomain('wpvn', false, 'wpvn-username-changer/l10n');
        $this->level_can_use = get_option('wpvn_username_changer');
        add_action('admin_menu', array(&$this, 'wpvn_add_menu'));
    }

    function wpvn_add_menu(){
        if ( 0 > $this->level_can_use || 10 < $this->level_can_use || !is_numeric($this->level_can_use) )
            $this->level_can_use = 10;
        add_submenu_page('users.php', __('Change Your Username','wpvn'), __('Change Username','wpvn'), $this->level_can_use, 'wpvn-username-changer', array(&$this, 'wpvn_username_changer'));
    }

    function wpvn_username_changer(){
        global $wpdb, $userdata, $current_user;

        get_currentuserinfo();

        if (!empty($_POST['new_user_login'])) {
            $new_user_login = sanitize_user($_POST['new_user_login'], true);
            $new_user_login_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_login = %s AND ID != %d LIMIT 1" , $new_user_login, (int) $userdata->ID ) );
            if ($new_user_login_check) {
                    echo "<div id='message' class='error'><p><strong>".
                        __('The entered username is used by another user, please choose a different one!','wpvn')
                        ."</strong></p></div>";
            }
        } elseif (isset($_POST['level_can_use'])) {
            if ( 0 > $_POST['level_can_use'] || 10 < $_POST['level_can_use'] || !is_numeric($_POST['level_can_use']) )
                $_POST['level_can_use'] = 10;
            update_option('wpvn_username_changer', $_POST['level_can_use']);
            $this->level_can_use = get_option('wpvn_username_changer');
        }
        if (!empty($_POST['new_user_login']) && $_POST['new_user_login'] !== $userdata->user_login && !$new_user_login_check) {
            $new_user_nicename = sanitize_title($new_user_login);
            $new_nickname = $new_user_login;
            $new_user_nicename_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND ID != %d LIMIT 1" , $new_user_nicename, (int) $userdata->ID ) );
                if ($new_user_nicename_check) {
                    $suffix = 2;
                    while ($new_user_nicename_check) {
                        $alt_new_user_nicename = $new_user_nicename . "-$suffix";
                        $new_user_nicename_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND ID != %d LIMIT 1" , $alt_new_user_nicename, (int) $userdata->ID ) );
                        $suffix++;
                    }
                    $new_user_nicename = $alt_new_user_nicename;
                }
                $q = sprintf( "UPDATE %s SET user_login='%s', user_nicename='%s', display_name='%s' WHERE ID=%d", $wpdb->users, $new_user_login, $new_user_nicename, $new_nickname, (int) $userdata->ID );
                if (false !== $wpdb->query($q)){
                    update_usermeta( $userdata->ID, 'nickname', $new_nickname );
                    get_currentuserinfo();
                    echo "<div id='message' class='updated fade'><p><strong>".
                        sprintf(__('Your username was changed to <em>%s</em>. Please <a href="%s">log in</a> again with this username now.','wpvn'), $user_login, get_option('siteurl').'/wp-login.php')
                        ."</strong></p></div>";
                } else {
                    echo "<div id='message' class='error'><p><strong>".
                        __('A database error occured : ','wpvn').$wpdb->last_error
                        ."</strong></p></div>";
                }
        } else {
            if ($_POST['new_user_login'] === $userdata->user_login) {
                echo "<div id='message' class='error'><p><strong>".
                    __('The new username is identic to the old one, so no change was made!','wpvn')
                    ."</strong></p></div>";
            }
?>
            <div class="wrap">
                <h2><?php _e('Change Your Username','wpvn') ?></h2>
                <form name="wpvn_username_changer" method="post">
                    <table>
                        <tr>
                            <th align="left"><label for="current_user_login"><?php _e('Current Username','wpvn') ?></label></th>
                            <td><input type="text" id="current_user_login" name="current_user_login" value="<?php echo $userdata->user_login ?>" size="30" disabled="disabled" /></td>
                        </tr>
                        <tr>
                            <th align="left"><label for="new_username"><?php _e('New Username','wpvn') ?></label></th>
                            <td><input type="text" id="new_user_login" name="new_user_login" value="" size="30" /></td>
                        </tr>
                    </table>
                    <p><?php _e('After clicking <strong>Save Changes</strong>, you will need to log in with your new username.','wpvn') ?></p>
                    <p class="submit"><input type="submit" id="wpvn_username_changer_submit" name="wpvn_username_changer_submit" class="button" value="<?php _e('Save Changes','wpvn') ?>" /></p>
                </form>
                <?php if(current_user_can('edit_users')) { ?>
                <hr />
                <h2><?php _e('Settings','wpvn') ?></h2>
                <form name="wpvn_username_changer_settings" method="post">
                    <table>
                        <tr>
                            <th align="left"><label for="level_can_use"><?php _e('Users must have at least this level to be able to change their username','wpvn') ?></label></th>
                            <td>
                                <select type="text" id="level_can_use" name="level_can_use">
                                    <option value="10" <?php if(10 == $this->level_can_use) echo "selected" ?>><?php echo (function_exists('_x')) ? _x( 'Administrator', 'User role' ) : _e('Administrator', 'wpvn') ?></option>
                                    <option value="7" <?php if(7 == $this->level_can_use) echo "selected" ?>><?php echo (function_exists('_x')) ? _x( 'Editor', 'User role' ) : _e( 'Editor', 'wpvn' ); ?></option>
                                    <option value="2" <?php if(2 == $this->level_can_use) echo "selected" ?>><?php echo (function_exists('_x')) ? _x( 'Author', 'User role' ) : _e( 'Author', 'wpvn' ); ?></option>
                                    <option value="1" <?php if(1 == $this->level_can_use) echo "selected" ?>><?php echo (function_exists('_x')) ? _x( 'Contributor', 'User role' ) : _e( 'Contributor', 'wpvn' ); ?></option>
                                    <option value="0" <?php if(0 == $this->level_can_use) echo "selected" ?>><?php echo (function_exists('_x')) ? _x( 'Subscriber', 'User role' ) : _e( 'Subscriber', 'wpvn' ); ?></option>
                                </select>
                            </td>
                        </tr>
                    </table>
                    <p class="submit"><input type="submit" id="level_can_use_submit" name="level_can_use_submit" class="button" value="<?php _e('Save Changes','wpvn') ?>" /></p>
                </form>
                <?php } ?>
            </div>
<?php
        }
    }
}

}

if( is_admin() && version_compare($wp_version, '2.3.0', '>=') ) {
    $wpvn_username_changer = new wpvn_username_changer;
}
?>