from flask import abort, current_app, request
from flask_login import current_user
from flask_socketio import disconnect
from functools import wraps
from threading import Thread


def admin_required(f):
    @wraps(f)
    def wrapped(*args, **kwargs):
        if current_user.is_administrator:
            return f(*args, **kwargs)
        else:
            abort(403)
    return wrapped


def background(f):
    '''
    ' This decorator executes a function in a Thread.
    ' Decorated functions need to be executed within a code block where an
    ' app context exists.
    '
    ' NOTE: An app object is passed as a keyword argument to the decorated
    '       function.
    '''
    @wraps(f)
    def wrapped(*args, **kwargs):
        kwargs['app'] = current_app._get_current_object()
        thread = Thread(target=f, args=args, kwargs=kwargs)
        thread.start()
        return thread
    return wrapped


def socketio_admin_required(f):
    @wraps(f)
    def wrapped(*args, **kwargs):
        if current_user.is_administrator:
            return f(*args, **kwargs)
        else:
            response = {'code': 401, 'desc': 'Unauthorized'}
            socketio.emit(request.event['message'], response, room=request.sid)
    return wrapped


def socketio_login_required(f):
    @wraps(f)
    def wrapped(*args, **kwargs):
        if current_user.is_authenticated:
            return f(*args, **kwargs)
        else:
            response = {'code': 401, 'desc': 'Unauthorized'}
            socketio.emit(request.event['message'], response, room=request.sid)
    return wrapped