/*
 Plugin Name: Redirect Passwort
Plugin URI: TODO
Description: TODO
Author: xaeDes
Version: 0.1
Author URI: TODO
License: GPL2
*/

function redirect_passwort_profile_update($user_id, $old_user_data) {
    $user = new WP_User( $user_id );
    if( $user->data->user_pass != $old_user_data->user_pass) {
        //password has changed
        update_metadata("user",$user_id,"changed_password",true);
    }
}
add_action("profile_update", "redirect_passwort_profile_update", 10, 2);

function redirect_passwort_login_redirect($redirect_to, $url_redirect_to = '', $user = null) {

    if( isset($user->ID) ) {
        $changed_password = get_metadata("user", $user->ID, "changed_password",true);
        if( $changed_password != true ) {
            return get_bloginfo('url') . "/change-your-password-dude/";
        } else {
            return $redirect_to;
        }
    }
}
add_filter('login_redirect', 'redirect_passwort_login_redirect',10,3);

function redirect_passwort_password_reset( $user ) {
    //password has been reset to a random one. so the changed_password meta data should be reset as well
    if( isset($user->ID) ) {
        delete_metadata("user", $user->ID, "changed_password");
    }
}
add_action('password_reset', 'redirect_passwort_password_reset');

function after_user_register( $user_id ){

        // the new user just registered but never logged in yet
        update_user_meta((int) $user_id, "has_not_logged_in_yet", "true");
    }

    add_action( 'user_register', 'after_user_register', 10, 1 );

    function after_user_loggedin( $user_id ){

        if(get_user_meta((int) $user_id , "has_not_logged_in_yet")){

            delete_user_meta(int) $user_id, "ussync_has_not_logged_in_yet");

            //do something else
        }
    }

    add_action( 'wp_login', 'after_user_loggedin', 10, 1 );