from copy import deepcopy
from typing import Any, Dict, List, Optional

from ..utils.access_permissions import BaseAccessPermissions
from ..utils.auth import has_perm, in_some_groups
from ..utils.collection import CollectionElement


class MotionAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for Motion and MotionViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import MotionSerializer

        return MotionSerializer

    def get_restricted_data(
            self,
            full_data: List[Dict[str, Any]],
            user: Optional[CollectionElement]) -> List[Dict[str, Any]]:
        """
        Returns the restricted serialized data for the instance prepared for
        the user. Removes motion if the user has not the permission to see
        the motion in this state. Removes comments sections for
        some unauthorized users. Ensures that a user can only see his own
        personal notes.
        """
        # Parse data.
        if has_perm(user, 'motions.can_see'):
            # TODO: Refactor this after personal_notes system is refactored.
            data = []
            for full in full_data:
                # Check if user is submitter of this motion.
                if isinstance(user, CollectionElement):
                    is_submitter = user.get_full_data()['id'] in [
                        submitter['user_id'] for submitter in full.get('submitters', [])]
                else:
                    # Anonymous users can not be submitters.
                    is_submitter = False

                # Check see permission for this motion.
                required_permission_to_see = full['state_required_permission_to_see']
                permission = (
                    not required_permission_to_see or
                    has_perm(user, required_permission_to_see) or
                    has_perm(user, 'motions.can_manage') or
                    is_submitter)

                # Parse single motion.
                if permission:
                    full_copy = deepcopy(full)
                    full_copy['comments'] = []
                    for comment in full['comments']:
                        if in_some_groups(user, comment['read_groups_id']):
                            full_copy['comments'].append(comment)
                    data.append(full_copy)
        else:
            data = []

        return data


class MotionChangeRecommendationAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for MotionChangeRecommendation and MotionChangeRecommendationViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import MotionChangeRecommendationSerializer

        return MotionChangeRecommendationSerializer


class MotionCommentSectionAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for MotionCommentSection and MotionCommentSectionViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import MotionCommentSectionSerializer

        return MotionCommentSectionSerializer

    def get_restricted_data(
            self,
            full_data: List[Dict[str, Any]],
            user: Optional[CollectionElement]) -> List[Dict[str, Any]]:
        """
        If the user has manage rights, he can see all sections. If not all sections
        will be removed, when the user is not in at least one of the read_groups.
        """
        data: List[Dict[str, Any]] = []
        if has_perm(user, 'motions.can_manage'):
            data = full_data
        else:
            for full in full_data:
                read_groups = full.get('read_groups_id', [])
                if in_some_groups(user, read_groups):
                    data.append(full)
        return data


class StatuteParagraphAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for StatuteParagraph and StatuteParagraphViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import StatuteParagraphSerializer

        return StatuteParagraphSerializer


class CategoryAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for Category and CategoryViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import CategorySerializer

        return CategorySerializer


class MotionBlockAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for Category and CategoryViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import MotionBlockSerializer

        return MotionBlockSerializer


class WorkflowAccessPermissions(BaseAccessPermissions):
    """
    Access permissions container for Workflow and WorkflowViewSet.
    """
    def check_permissions(self, user):
        """
        Returns True if the user has read access model instances.
        """
        return has_perm(user, 'motions.can_see')

    def get_serializer_class(self, user=None):
        """
        Returns serializer class.
        """
        from .serializers import WorkflowSerializer

        return WorkflowSerializer