from update import update
from browser import window

    
class Message:
    def __init__(self, *args):
        self._args = args
        self.error = None
        
    def update_model(self, model):
        raise NotImplementedError("This message does not implement update_model method")
    
    def on_event(self, event):
        pass
    
    def get_arg(self, n, argtype=None):
        if n > len(self._args):
            window.console.log("not enough arguments: {} <= {}".format(n, len(self._args)))
                               
        result = self._args[n]
        if argtype is not None:
            if not type(result) is argtype:
                window.console.trace("Error type check!")
                return None
        
        return result
    
    def data_change(self):
        return True
    
    def add_arg(self, arg):
        self._args.append(arg)
    
    def reset(self):
        return True
        
        
class ClickMessage(Message):
    def on_event(self, event):
        event.stopPropagation()
    
    def data_change(self):
        return False
        

def msg(message, params):
    if not issubclass(type(message), Message):
        window.console.log("Not scheduling a Message type, this will not work!")
        return lambda: None
        
    def callback(event):
        message.on_event(event) #message_class(event, params)
        update.schedule(message)
    return callback