# django imports
from django.contrib.auth import login

# rest_framework imports
from rest_framework import generics, permissions
from rest_framework.authtoken.serializers import AuthTokenSerializer
from api.filters import UserFilter
from api.mixins import StaffEditorPermissionMixin
from api.models import User, Atoll, Island
from rest_framework.response import Response
from rest_framework import status
from rest_framework.exceptions import ValidationError
from rest_framework.decorators import api_view, permission_classes
from api.serializers import AtollSerializer, IslandSerializer

# knox imports
from knox.views import LoginView as KnoxLoginView
from knox.models import AuthToken
from django_filters.rest_framework import DjangoFilterBackend
import re
from typing import cast, Dict, Any
from django.core.mail import send_mail

# local apps import
from .serializers import (
    KnoxTokenSerializer,
    UserSerializer,
    AuthSerializer,
    CustomUserSerializer,
    CustomReadOnlyUserSerializer,
    CustomReadOnlyUserByIDCardSerializer,
)


class CreateUserView(generics.CreateAPIView):
    # Create user API view
    serializer_class = UserSerializer
    permission_classes = (permissions.AllowAny,)
    queryset = User.objects.all()

    def post(self, request, *args, **kwargs):
        # Extract required fields from request data
        password = request.data.get("password")
        username = request.data.get("username")  # This can be None
        address = request.data.get("address")
        mobile = request.data.get("mobile")
        acc_no = request.data.get("acc_no")
        id_card = request.data.get("id_card")
        dob = request.data.get("dob")
        atoll_id = request.data.get("atoll")  # Get the atoll ID
        island_id = request.data.get("island")  # Get the island ID
        terms_accepted = request.data.get("terms_accepted")
        policy_accepted = request.data.get("policy_accepted")
        firstname = request.data.get("firstname")
        lastname = request.data.get("lastname")
        # Validate required fields

        existing_username = User.objects.filter(username=username).first()
        if existing_username:
            return Response({"message": "Username already exists."}, status=400)

        if not firstname:
            return Response({"message": "firstname is required."}, status=400)
        if not lastname:
            return Response({"message": "lastname is required."}, status=400)
        if not password:
            return Response({"message": "Password is required."}, status=400)
        if not username:
            return Response({"message": "Username is required."}, status=400)
        if not address:
            return Response({"message": "Address is required."}, status=400)
        if not mobile:
            return Response({"message": "Mobile number is required."}, status=400)
        if not acc_no:
            return Response({"message": "Account number is required."}, status=400)
        if not id_card:
            return Response({"message": "ID card is required."}, status=400)
        if not dob:
            return Response({"message": "Date of birth is required."}, status=400)
        if not atoll_id:
            return Response({"message": "Atoll is required."}, status=400)
        if not island_id:
            return Response({"message": "Island is required."}, status=400)
        if terms_accepted is None:
            return Response({"message": "Terms acceptance is required."}, status=400)
        if policy_accepted is None:
            return Response({"message": "Policy acceptance is required."}, status=400)

        if not re.match(r"^[A-Z]{1,2}[0-9]{6,7}$", id_card):
            return Response(
                {"message": "Please enter a valid ID card number."}, status=400
            )

        if not re.match(r"^[7|9][0-9]{6}$", mobile):
            return Response(
                {"message": "Please enter a valid mobile number."}, status=400
            )

        if not re.match(r"^(7\d{12}|9\d{16})$", acc_no):
            return Response(
                {"message": "Please enter a valid account number."}, status=400
            )

        # Fetch Atoll and Island instances
        try:
            atoll = Atoll.objects.get(id=atoll_id)
            island = Island.objects.get(id=island_id)
        except Atoll.DoesNotExist:
            return Response({"message": "Atoll not found."}, status=404)
        except Island.DoesNotExist:
            return Response({"message": "Island not found."}, status=404)

        # Create user without email
        user = User.objects.create_user(
            first_name=firstname,
            last_name=lastname,
            username=username,
            password=password,
            address=address,
            mobile=mobile,
            acc_no=acc_no,
            id_card=id_card,
            dob=dob,
            atoll=atoll,  # Assign the Atoll instance
            island=island,  # Assign the Island instance
            terms_accepted=terms_accepted,
            policy_accepted=policy_accepted,
        )
        serializer = self.get_serializer(user)
        headers = self.get_success_headers(serializer.data)
        return Response(
            serializer.data, status=status.HTTP_201_CREATED, headers=headers
        )


class LoginView(KnoxLoginView):
    # login view extending KnoxLoginView
    serializer_class = AuthSerializer
    permission_classes = (permissions.AllowAny,)
    throttle_scope = "login"

    def post(self, request, format=None):
        try:
            serializer = AuthTokenSerializer(data=request.data)
            serializer.is_valid(raise_exception=True)
            user = cast(Dict[str, Any], serializer.validated_data)["user"]
            login(request, user)
            response = super(LoginView, self).post(request, format=None)
            return response
        except ValidationError as e:
            message = "Unable to log in with provided credentials."
            if (
                hasattr(e, "detail")
                and isinstance(e.detail, list)
                and len(e.detail) > 0
            ):
                message = e.detail[0]
            return Response({"message": message}, status=status.HTTP_400_BAD_REQUEST)


class ManageUserView(generics.RetrieveUpdateAPIView):
    """Manage the authenticated user"""

    serializer_class = CustomUserSerializer
    permission_classes = (permissions.IsAuthenticated,)

    def get_object(self):
        """Retrieve and return authenticated user"""
        return self.request.user


class KnoxTokenListApiView(
    StaffEditorPermissionMixin,
    generics.ListAPIView,
):
    # Create user API view
    serializer_class = KnoxTokenSerializer
    permission_classes = (permissions.IsAuthenticated,)
    queryset = AuthToken.objects.all()

    def get(self, request, *args, **kwargs):
        user_id = getattr(request.user, "id", None)
        if user_id is None:
            return Response({"error": "User ID not found"}, status=400)
        queryset = AuthToken.objects.filter(user_id=user_id)
        data = KnoxTokenSerializer(queryset, many=True).data
        return Response({"data": data})


class ListUserView(StaffEditorPermissionMixin, generics.ListAPIView):
    # Create user API view
    serializer_class = CustomReadOnlyUserSerializer
    filter_backends = [DjangoFilterBackend]
    filterset_fields = "__all__"
    filterset_class = UserFilter
    queryset = User.objects.all()


class ListUserByIDCardView(generics.ListAPIView):
    # Create user API view
    permission_classes = (permissions.AllowAny,)
    serializer_class = CustomReadOnlyUserByIDCardSerializer
    filter_backends = [DjangoFilterBackend]
    filterset_fields = "__all__"
    filterset_class = UserFilter
    queryset = User.objects.all()


class UserDetailAPIView(StaffEditorPermissionMixin, generics.RetrieveAPIView):
    queryset = User.objects.all()
    serializer_class = CustomReadOnlyUserSerializer
    lookup_field = "pk"

    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance)
        data = serializer.data

        # Customize the response format

        return Response(data)


@api_view(["GET"])
def healthcheck(request):
    return Response({"status": "ok"}, status=status.HTTP_200_OK)


@api_view(["POST"])
@permission_classes((permissions.AllowAny,))
def test_email(request):
    send_mail(
        "Subject here",
        "Here is the message.",
        "noreply@sarlink.net",
        ["shihaam@shihaam.me"],
        fail_silently=False,
    )
    return Response({"status": "ok"}, status=status.HTTP_200_OK)


class CreateAtollView(StaffEditorPermissionMixin, generics.CreateAPIView):
    serializer_class = AtollSerializer
    queryset = Atoll.objects.all()

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        name = serializer.validated_data.get("name")
        print(name)
        if Atoll.objects.filter(name=name).exists():
            return Response({"message": "Atoll name already exists."}, status=400)
        return super().create(request, *args, **kwargs)


class ListAtollView(generics.ListAPIView):
    permission_classes = (permissions.AllowAny,)
    serializer_class = AtollSerializer
    queryset = Atoll.objects.all()
    throttle_classes = ()  # override throttling


class RetrieveUpdateDestroyAtollView(
    StaffEditorPermissionMixin, generics.RetrieveUpdateDestroyAPIView
):
    serializer_class = AtollSerializer
    queryset = Atoll.objects.all()
    lookup_field = "pk"

    def update(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        name = serializer.validated_data.get("name")
        if name and Atoll.objects.filter(name=name).exclude(pk=instance.pk).exists():
            return Response({"message": "Atoll name already exists."}, status=400)
        return super().update(request, *args, **kwargs)


class ListCreateIslandView(StaffEditorPermissionMixin, generics.ListCreateAPIView):
    serializer_class = IslandSerializer
    queryset = Island.objects.all()

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        name = serializer.validated_data.get("name")
        if Island.objects.filter(name=name).exists():
            return Response({"message": "Island name already exists."}, status=400)
        return super().create(request, *args, **kwargs)


class RetrieveUpdateDestroyIslandView(
    StaffEditorPermissionMixin, generics.RetrieveUpdateDestroyAPIView
):
    serializer_class = IslandSerializer
    queryset = Island.objects.all()
    lookup_field = "pk"

    def update(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        name = serializer.validated_data.get("name")
        if name and Island.objects.filter(name=name).exclude(pk=instance.pk).exists():
            return Response({"message": "Island name already exists."}, status=400)
        return super().update(request, *args, **kwargs)