from django.contrib.auth import authenticate, login, logout
from django.views.decorators.csrf import csrf_exempt
from django.utils.decorators import method_decorator


from rest_framework.decorators import action
from rest_framework.permissions import AllowAny, IsAdminUser, IsAuthenticated
from rest_framework.response import Response
from rest_framework.viewsets import ModelViewSet

from core.mixins import ActionBasedMixin

from market.serializers import PostSerializer
from .models import User
from .serializers import (
    UserSerializer,
    UserCreateSerializer,
    PasswordSerializer,
)


class UserViewset(ActionBasedMixin, ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer
    serializer_class_map = {
        "create": UserCreateSerializer,
        "posts": PostSerializer,
        "password": PasswordSerializer,
    }
    permission_classes = [IsAdminUser]
    permission_classes_map = {
        "create": [AllowAny],
        "login": [AllowAny],
        "logout": [IsAuthenticated],
        "me": [IsAuthenticated],
        "posts": [IsAuthenticated],
        "password": [IsAuthenticated],
    }

    @action(detail=False, methods=["GET"])
    def posts(self, request):
        user = request.user
        queryset = user.posts.all()

        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)

    @action(detail=False, methods=["PATCH"])
    def password(self, request):
        user = request.user
        if user.is_anonymous:
            return Response(status=401)
        oldPassword = request.data["oldPassword"]
        newPassword = request.data["newPassword"]
        if not user.check_password(oldPassword):
            return Response(status=400, data={"msg": "현재 비밀번호가 일치하지 않습니다"})
        serializer = self.get_serializer(data=request.data)
        if not serializer.is_valid():
            msg = " ".join(serializer.errors["newPassword"])
            return Response(status=400, data={"msg": msg})
        user.set_password(newPassword)
        user.save()
        return Response(status=204)

    def create(self, request, *args, **kwargs):
        serializer = UserCreateSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        user = serializer.save()
        login(request, user)
        return Response(serializer.data, status=201)

    @action(detail=False, methods=["GET"])
    def me(self, request):
        serializer = self.get_serializer(request.user)
        return Response(serializer.data)

    @action(detail=False, methods=["POST"])
    @method_decorator(csrf_exempt)
    def login(self, request):
        username = request.data["username"]
        password = request.data["password"]
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return Response({"msg": "success"})
        return Response(status=401)

    @action(detail=False, methods=["POST"])
    def logout(self, request):
        logout(request)
        return Response(status=204)