# Copyright (c) 2012-2016 Seafile Ltd.
try:
    from functools import update_wrapper, wraps
except ImportError:
    from django.utils.functional import update_wrapper, wraps  # Python 2.4 fallback.

from seahub.auth import REDIRECT_FIELD_NAME
from django.http import HttpResponseRedirect, HttpResponse, Http404
from django.utils.http import urlquote
import json
from django.utils.translation import ugettext as _

def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):
    """
    Decorator for views that checks that the user passes the given test,
    redirecting to the log-in page if necessary. The test should be a callable
    that takes the user object and returns True if the user passes.
    """
    if not login_url:
        from django.conf import settings
        login_url = settings.LOGIN_URL

    def decorator(view_func):
        def _wrapped_view(request, *args, **kwargs):
            if test_func(request.user):
                return view_func(request, *args, **kwargs)
            path = urlquote(request.get_full_path())
            tup = login_url, redirect_field_name, path
            return HttpResponseRedirect('%s?%s=%s' % tup)
        return wraps(view_func)(_wrapped_view)
    return decorator


def login_required(function=None, redirect_field_name=REDIRECT_FIELD_NAME):
    """
    Decorator for views that checks that the user is logged in, redirecting
    to the log-in page if necessary.
    """
    actual_decorator = user_passes_test(
        lambda u: u.is_authenticated,
        redirect_field_name=redirect_field_name
    )
    if function:
        return actual_decorator(function)
    return actual_decorator


def permission_required(perm, login_url=None):
    """
    Decorator for views that checks whether a user has a particular permission
    enabled, redirecting to the log-in page if necessary.
    """
    return user_passes_test(lambda u: u.has_perm(perm), login_url=login_url)


def login_required_ajax(function=None,redirect_field_name=None):
    """
    Just make sure the user is authenticated to access a certain ajax view

    Otherwise return a HttpResponse 401 - authentication required
    instead of the 302 redirect of the original Django decorator
    """
    def _decorator(view_func):
        def _wrapped_view(request, *args, **kwargs):
            if not request.is_ajax():
                raise Http404

            if request.user.is_authenticated:
                return view_func(request, *args, **kwargs)
            else:
                content_type = 'application/json; charset=utf-8'
                return HttpResponse(json.dumps({
                    'error': _('Please log in.')
                    }), status=401, content_type=content_type)

        return _wrapped_view

    if function is None:
        return _decorator
    else:
        return _decorator(function)
