# coding: utf-8
from rest_framework import generics, viewsets, permissions, status
from rest_framework.parsers import MultiPartParser, FormParser, JSONParser
from rest_framework_simplejwt.views import TokenObtainPairView
from rest_framework.views import APIView
from rest_framework.response import Response
from django.shortcuts import get_object_or_404
from drf_spectacular.utils import extend_schema, OpenApiParameter
from django.contrib.auth import get_user_model

from .models import Link, LinkGroup
from .serializers import (
    RegisterSerializer,
    UserSerializer,
    LinkSerializer,
    LinkGroupSerializer,
)

User = get_user_model()


class RegisterView(generics.CreateAPIView):
    queryset = User.objects.all()
    permission_classes = [permissions.AllowAny]
    serializer_class = RegisterSerializer


class LoginView(TokenObtainPairView):
    permission_classes = [permissions.AllowAny]


class LinkGroupViewSet(viewsets.ModelViewSet):
    queryset = LinkGroup.objects.all()
    serializer_class = LinkGroupSerializer
    permission_classes = [permissions.IsAuthenticated]
    parser_classes = [MultiPartParser, FormParser, JSONParser]

    def get_queryset(self):
        return self.queryset.filter(owner=self.request.user).order_by('order')

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)


class LinkViewSet(viewsets.ModelViewSet):
    queryset = Link.objects.all()
    serializer_class = LinkSerializer
    permission_classes = [permissions.IsAuthenticated]
    parser_classes = [MultiPartParser, FormParser, JSONParser]

    def get_queryset(self):
        return Link.objects.filter(owner=self.request.user).order_by('order')

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)


class UserProfileView(generics.RetrieveAPIView):
    serializer_class = UserSerializer
    permission_classes = [permissions.IsAuthenticated]
    def get_object(self):
        return self.request.user


class UserLinksListView(generics.ListAPIView):
    serializer_class = LinkSerializer
    permission_classes = [permissions.AllowAny]
    def get_queryset(self):
        username = self.kwargs['username']
        return Link.objects.filter(owner__username=username).order_by('order')


class PublicUserGroupsView(APIView):
    """
    GET /api/users/{username}/public/
    """
    permission_classes = [permissions.AllowAny]

    def get(self, request, username):
        # 1. Ищем пользователя
        user = get_object_or_404(User, username=username)

        # 2. Берём его группы со ссылками
        groups_qs = LinkGroup.objects.filter(owner=user).prefetch_related('links')

        result = {
            "username": user.username,
            "groups": []
        }

        for grp in groups_qs:
            # icon у группы (абсолютный URL)
            grp_icon_url = None
            if grp.icon:
                grp_icon_url = request.build_absolute_uri(grp.icon.url)

            grp_data = {
                "id": grp.id,
                "name": grp.name,
                "icon": grp_icon_url,
                "links": [],
            }

            for ln in grp.links.all():
                # icon у ссылки
                ln_icon_url = None
                if ln.icon:
                    ln_icon_url = request.build_absolute_uri(ln.icon.url)

                grp_data["links"].append({
                    "id":    ln.id,
                    "title": ln.title,
                    "url":   ln.url,
                    "icon":  ln_icon_url,
                })

            result["groups"].append(grp_data)

        return Response(result, status=status.HTTP_200_OK)