r"""wslink is a module that extends any
wslink related classes for the purposes of vtkWeb.

"""

from __future__ import absolute_import, division, print_function

# import inspect, types, string, random, logging, six, json, re, base64
import json, base64, logging, time

from vtkmodules.web.errors import WebDependencyMissingError

try:
    from wslink import websocket
    from wslink import register as exportRpc
except ImportError:
    raise WebDependencyMissingError()

from vtkmodules.web import protocols
from vtkmodules.vtkWebCore import vtkWebApplication

# =============================================================================
application = None

# =============================================================================
#
# Base class for vtkWeb ServerProtocol
#
# =============================================================================


class ServerProtocol(websocket.ServerProtocol):
    """
    Defines the core server protocol for vtkWeb. Adds support to
    marshall/unmarshall RPC callbacks that involve ServerManager proxies as
    arguments or return values.

    Applications typically don't use this class directly, but instead
    sub-class it and call self.registerVtkWebProtocol() with useful vtkWebProtocols.
    """

    def __init__(self):
        logging.info("Creating SP")
        self.setSharedObject("app", self.initApplication())
        websocket.ServerProtocol.__init__(self)

    def initApplication(self):
        """
        Let subclass optionally initialize a custom application in lieu
        of the default vtkWebApplication.
        """
        global application
        if not application:
            application = vtkWebApplication()
        return application

    def setApplication(self, application):
        self.setSharedObject("app", application)

    def getApplication(self):
        return self.getSharedObject("app")

    def registerVtkWebProtocol(self, protocol):
        self.registerLinkProtocol(protocol)

    def getVtkWebProtocols(self):
        return self.getLinkProtocols()