"""This module contains the access checks

"""

__authors__ = [

  '"Madhusudan.C.S" <madhusudancs@gmail.com>',

]

from functools import wraps

from django.shortcuts import render_to_response

from django.template import RequestContext

# Dictionary containing access checks for views.

# Keys: View function name.

# Values: proposer or staff

rights = {}

def register(access_type):

  """Function to register access type for a View function

  """

  def wrapper(func):

    """The decorator for registering access checks.

    """

    rights['%s.%s' % (func.__module__, func.__name__)] = access_type

    return func

  return wrapper

def checkAccess(func):

  """ To check the access of the user and then return the appropriate function 

  object.

 """

  @wraps(func)

  def wrapper(request, *args, **kwargs):

    """The decorator for access check.

    """

    user_kind = rights['%s.%s' % (func.__module__, func.__name__)]

    user = request.user

    template = 'projrev/error.html'

    context = {}

    if user.is_authenticated():

      if user_kind == 'reviewer':

        if user.is_staff:

          return func(request, *args, **kwargs)

        else:

          context['not_staff'] = True 

          return render_to_response(template, RequestContext(request, context)) 

      if user_kind == 'proposer':

        if not user.is_staff:

          return func(request, *args, **kwargs)

        else:

          context['not_proposer'] = True

          return render_to_response(template, RequestContext(request, context))

    else:

      context['not_authenticated'] = True

      return render_to_response(template, RequestContext(request, context))

  return wrapper