from django.contrib.auth import get_user_model
from django.contrib import auth
from rest_framework.views import APIView
from rest_framework.renderers import JSONRenderer
from rest_framework.response import Response

from access.serializers import UserInitSerializer
from courses.models import Course


class TeacherListView(APIView):
    renderer_classes = (JSONRenderer,)
    status_code = 200

    def get(self, request):
        kwargs = dict(
            in_role='T',
            is_active=True,
            reg_status=4,
        )
        res = []
        course_id = request.GET.get('course_id', 0)
        if course_id:
            kwargs['course_teachers'] = Course.objects.get(id=course_id)
        for teacher in get_user_model().objects.filter(**kwargs):
            res.append(teacher.full_name())
        return Response(res, self.status_code)


class CheckUserView(APIView):
    renderer_classes = (JSONRenderer,)
    status_code = 200

    def get(self, request):
        if request.user.is_authenticated() and (request.user.in_role in ['M', 'S', 'S2', 'A'] or request.user.is_admin):
            return Response(True, status=self.status_code)
        return Response(False, status=self.status_code)


class InfoUserView(APIView):
    renderer_classes = (JSONRenderer,)
    status_code = 200

    def get(self, request):
        if request.user.is_authenticated():
            return Response(UserInitSerializer(request.user).data, status=self.status_code)
        return Response('anonymous', status=self.status_code)


class RegistrationView(APIView):
    renderer_classes = (JSONRenderer,)

    @staticmethod
    def post(request):
        try:
            user = get_user_model().objects.get(email=request.JSON['email'].lower())
        except get_user_model().DoesNotExist:
            user = get_user_model().objects.create_user(
                email=request.JSON['email'].lower(),
            )
            user.set_password(request.JSON['password'])
            user.reg_status = '2'
            user.save()
        return Response(UserInitSerializer(user).data, status=200)


class ChangePasswordView(APIView):
    renderer_classes = (JSONRenderer,)

    @staticmethod
    def post(request):
        if request.user.is_authenticated and not request.user.check_password(request.JSON['old_password']):
            return Response("Неверный пароль", status=404)
        request.user.set_password(request.JSON['new_password'])
        request.user.save()
        return Response("Пароль был изменён", status=200)


class LoginView(APIView):
    renderer_classes = (JSONRenderer,)

    @staticmethod
    def post(request):
        if not request.user.is_authenticated():
            user = auth.authenticate(email=request.JSON.get('email'), password=request.JSON.get('password'))
            try:
                auth.login(request, user)
            except AttributeError:
                return Response("Неверный пароль", status=404)
        return Response(UserInitSerializer(request.user).data, status=200)


class LogoutView(APIView):
    renderer_classes = (JSONRenderer,)

    @staticmethod
    def post(request):
        if request.user.is_authenticated():
            auth.logout(request)
        return Response(status=204)