import csv
from datetime import datetime

from django.http import HttpResponse, HttpResponseNotFound
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import generics, status
from rest_framework import permissions
from rest_framework.authtoken.models import Token
from rest_framework.filters import OrderingFilter
from rest_framework.response import Response
from rest_framework.viewsets import ModelViewSet

from account import models, filters
from account.models import User
from account.serializers import back as serializers
from account.serializers.common import RoleBaseSerializer
from utils.methods import get_permission_classes
from utils.permissions import IsReviewManager


class RoleListView(generics.ListCreateAPIView):
    serializer_class = RoleBaseSerializer
    queryset = models.Role.objects.all()
    filter_class = filters.RoleListFilter
    permission_classes = get_permission_classes()


class RoleTypeRetrieveView(generics.GenericAPIView):
    permission_classes = get_permission_classes()

    def get(self, request, *args, **kwargs):
        """Implement GET-method"""
        country_code = None

        if (self.request.user.userrole_set.country_admin_role().exists() and
                hasattr(self.request, 'country_code')):
            country_code = self.request.country_code

        data = models.UserRole.objects.aggregate_role_counter(country_code)
        return Response(data, status=status.HTTP_200_OK)


class UserRoleListView(generics.ListCreateAPIView):
    serializer_class = serializers.UserRoleSerializer
    queryset = models.UserRole.objects.all()
    permission_classes = get_permission_classes()


class UserListView(generics.ListCreateAPIView):
    """User list create view."""
    serializer_class = serializers.BackUserSerializer
    filter_class = filters.AccountBackOfficeFilter
    filter_backends = (OrderingFilter, DjangoFilterBackend)
    permission_classes = get_permission_classes(IsReviewManager)

    ordering_fields = (
        'email_confirmed',
        'is_staff',
        'is_active',
        'is_superuser',
        'last_login',
        'date_joined',
    )

    def get_queryset(self):
        """Overridden get_queryset method."""
        return User.objects.with_extend_related()


class UserRUDView(generics.RetrieveUpdateDestroyAPIView):
    """User RUD view."""
    queryset = User.objects.all()
    serializer_class = serializers.BackDetailUserSerializer
    lookup_field = 'id'
    permission_classes = get_permission_classes()


def get_user_csv(request, id):
    """User CSV file download"""
    # fields = ["id", "uuid", "nickname", "locale", "country_code", "city", "role", "consent_purpose", "consent_at",
    #           "last_seen_at", "created_at", "updated_at", "email", "is_admin", "ezuser_id", "ez_user_id",
    #           "encrypted_password", "reset_password_token", "reset_password_sent_at", "remember_created_at",
    #           "sign_in_count", "current_sign_in_at", "last_sign_in_at", "current_sign_in_ip", "last_sign_in_ip",
    #           "confirmation_token", "confirmed_at", "confirmation_sent_at", "unconfirmed_email", "webpush_subscription"]

    # uuid == id
    #
    # Не найдены:
    # consent_purpose
    # consent_at
    # ezuser_id
    # ez_user_id
    # remember_created_at
    # sign_in_count
    # current_sign_in_at
    # current_sign_in_ip
    # last_sign_in_ip
    # confirmed_at
    # confirmation_sent_at
    # webpush_subscription
    #
    # country_code не получить - клиент не привязан к стране

    try:
        user = User.objects.get(id=id)
    except User.DoesNotExist:
        return HttpResponseNotFound("User not found")

    try:
        roles = " ".join([role for role in user.roles])
    except:
        roles = ""

    token, _ = Token.objects.get_or_create(user=user)

    fields = {
        "id": user.id,
        "uuid": user.id,
        "username": getattr(user, "username", ""),
        "locale": getattr(user, "locale", ""),
        "city": getattr(user, "city", ""),
        "role": roles,
        "created_at": getattr(user, "date_joined", ""),
        "updated_at": user.last_login,
        "email": user.email,
        "is_admin": user.is_superuser,
        "encrypted_password": user.password,
        "reset_password_token": token.key,
        "reset_password_sent_at": token.created,  # TODO: не уверен в назначении поля, лучше проверить
        "last_sign_in_at": user.last_login,  # Повтор?
        "confirmation_token": user.confirm_email_token,
        "unconfirmed_email": 1 if user.unconfirmed_email else 0
    }

    response = HttpResponse(content_type='text/csv')
    response['Content-Disposition'] = f'attachment; filename="{user.email}.csv"'

    writer = csv.writer(response)
    writer.writerow(fields.keys())
    writer.writerow(fields.values())

    return response


class UserCSVViewSet(ModelViewSet):
    queryset = User.objects.all()
    http_method_names = ['get', ]
    serializer_class = serializers.UserCSVSerializer
    permission_classes = (permissions.IsAdminUser,)
    filter_class = filters.AccountBackOfficeFilter
    filter_backends = (OrderingFilter, DjangoFilterBackend)

    ordering_fields = (
        'email_confirmed',
        'is_staff',
        'is_active',
        'is_superuser',
        'last_login',
        'date_joined',
    )

    def to_csv(self, request):
        queryset = self.filter_queryset(self.get_queryset())
        serializer = serializers.UserCSVSerializer(queryset, many=True)

        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = f'attachment; filename="users_{datetime.now().date()}.csv"'

        writer = csv.writer(response)
        writer.writerow((
            'id',
            'nickname',
            'email',
            'locale',
            'last_country',
            'created_at',
            # 'confirmed_at',
            'last_seen_at',
            'last_ip',
            # 'role',
        ))

        for item in serializer.data:
            print(item)
            writer.writerow(item.values())

        return response
        # return Response(serializer.data)