"""
Provides a set of pluggable permission policies.
"""
from __future__ import unicode_literals

from django.http import Http404

SAFE_METHODS = ('GET', 'HEAD', 'OPTIONS')


class BasePermission(object):
    """
    A base class from which all permission classes should inherit.
    """

    def has_permission(self, request, view):
        """
        Return `True` if permission is granted, `False` otherwise.
        """
        return True

    def has_object_permission(self, request, view, obj):
        """
        Return `True` if permission is granted, `False` otherwise.
        """
        return True


class AllowAny(BasePermission):
    """
    Allow any access.
    This isn't strictly required, since you could use an empty
    permission_classes list, but it's useful because it makes the intention
    more explicit.
    """
    def has_permission(self, request, view):
        return True


class IsAuthenticated(BasePermission):
    """
    Allows access only to authenticated users.
    """

    def has_permission(self, request, view):
        return request.user and request.user.is_authenticated()


class IsAdminUser(BasePermission):
    """
    Allows access only to admin users.
    """

    def has_permission(self, request, view):
        return request.user and request.user.is_staff


class IsAuthenticatedOrReadOnly(BasePermission):
    """
    The request is authenticated as a user, or is a read-only request.
    """

    def has_permission(self, request, view):
        return (
            request.method in SAFE_METHODS or
            request.user and
            request.user.is_authenticated()
        )


class DjangoModelPermissions(BasePermission):
    """
    The request is authenticated using `django.contrib.auth` permissions.
    See: https://docs.djangoproject.com/en/dev/topics/auth/#permissions

    It ensures that the user is authenticated, and has the appropriate
    `add`/`change`/`delete` permissions on the model.

    This permission can only be applied against view classes that
    provide a `.queryset` attribute.
    """

    # Map methods into required permission codes.
    # Override this if you need to also provide 'view' permissions,
    # or if you want to provide custom permission codes.
    perms_map = {
        'GET': [],
        'OPTIONS': [],
        'HEAD': [],
        'POST': ['%(app_label)s.add_%(model_name)s'],
        'PUT': ['%(app_label)s.change_%(model_name)s'],
        'PATCH': ['%(app_label)s.change_%(model_name)s'],
        'DELETE': ['%(app_label)s.delete_%(model_name)s'],
    }

    authenticated_users_only = True

    def get_required_permissions(self, method, model_cls):
        """
        Given a model and an HTTP method, return the list of permission
        codes that the user is required to have.
        """
        kwargs = {
            'app_label': model_cls._meta.app_label,
            'model_name': model_cls._meta.model_name
        }
        return [perm % kwargs for perm in self.perms_map[method]]

    def has_permission(self, request, view):
        # Workaround to ensure DjangoModelPermissions are not applied
        # to the root view when using DefaultRouter.
        if getattr(view, '_ignore_model_permissions', False):
            return True

        try:
            queryset = view.get_queryset()
        except AttributeError:
            queryset = getattr(view, 'queryset', None)

        assert queryset is not None, (
            'Cannot apply DjangoModelPermissions on a view that '
            'does not have `.queryset` property or overrides the '
            '`.get_queryset()` method.')

        perms = self.get_required_permissions(request.method, queryset.model)

        return (
            request.user and
            (request.user.is_authenticated() or not self.authenticated_users_only) and
            request.user.has_perms(perms)
        )


class DjangoModelPermissionsOrAnonReadOnly(DjangoModelPermissions):
    """
    Similar to DjangoModelPermissions, except that anonymous users are
    allowed read-only access.
    """
    authenticated_users_only = False


class DjangoObjectPermissions(DjangoModelPermissions):
    """
    The request is authenticated using Django's object-level permissions.
    It requires an object-permissions-enabled backend, such as Django Guardian.

    It ensures that the user is authenticated, and has the appropriate
    `add`/`change`/`delete` permissions on the object using .has_perms.

    This permission can only be applied against view classes that
    provide a `.queryset` attribute.
    """

    perms_map = {
        'GET': [],
        'OPTIONS': [],
        'HEAD': [],
        'POST': ['%(app_label)s.add_%(model_name)s'],
        'PUT': ['%(app_label)s.change_%(model_name)s'],
        'PATCH': ['%(app_label)s.change_%(model_name)s'],
        'DELETE': ['%(app_label)s.delete_%(model_name)s'],
    }

    def get_required_object_permissions(self, method, model_cls):
        kwargs = {
            'app_label': model_cls._meta.app_label,
            'model_name': model_cls._meta.model_name
        }
        return [perm % kwargs for perm in self.perms_map[method]]

    def has_object_permission(self, request, view, obj):
        try:
            queryset = view.get_queryset()
        except AttributeError:
            queryset = getattr(view, 'queryset', None)

        assert queryset is not None, (
            'Cannot apply DjangoObjectPermissions on a view that '
            'does not have `.queryset` property or overrides the '
            '`.get_queryset()` method.')

        model_cls = queryset.model
        user = request.user

        perms = self.get_required_object_permissions(request.method, model_cls)

        if not user.has_perms(perms, obj):
            # If the user does not have permissions we need to determine if
            # they have read permissions to see 403, or not, and simply see
            # a 404 response.

            if request.method in SAFE_METHODS:
                # Read permissions already checked and failed, no need
                # to make another lookup.
                raise Http404

            read_perms = self.get_required_object_permissions('GET', model_cls)
            if not user.has_perms(read_perms, obj):
                raise Http404

            # Has read permissions.
            return False

        return True
