from rest_framework import status
from rest_framework.viewsets import ViewSet
from rest_framework.permissions import IsAuthenticated
from rest_framework.decorators import action
from rest_framework.response import Response

from django.shortcuts import get_object_or_404
from django.core.validators import validate_email
from django.core.exceptions import ValidationError
from django.db import models

from api.auth.serializers import UserResponseSerializer
from api.models import UserProfile
from api.utils.decorators import handle_exceptions
from routes.models import Route, City, Country
from .serializers import RouteSerializer, CreateRouteSerializer, CitySerializer, CountrySerializer

class UserDataView(ViewSet):
    permission_classes = [IsAuthenticated]
    
    def initial(self, request, *args, **kwargs):
        try:
            super().initial(request, *args, **kwargs)
        except Exception as e:
            print(f"Authentication error: {e}")
            raise
    
    @action(detail=False, methods=['get'])
    @handle_exceptions
    def user_data(self, request):
        user = request.user
        
        try:
            user_data = UserResponseSerializer(user).data
            return Response(user_data, status=status.HTTP_200_OK)
        except UserProfile.DoesNotExist:
            return Response(
                {"error": "User profile not found"}, 
                status=status.HTTP_404_NOT_FOUND
            )
            
class AccountActionsView(ViewSet):
    permission_classes = [IsAuthenticated]
    
    @action(detail=False, methods=['patch'])
    @handle_exceptions
    
    def change_data_main_tab(self, request):
        """Обновление данных на главной странице аккаунта"""
        
        user = request.user
        user_profile = get_object_or_404(UserProfile, user=user)
        
        # обновляем данные пользователя
        if 'firstName' in request.data:
            user.first_name = request.data['firstName']
        if 'lastName' in request.data:
            user.last_name = request.data['lastName']
        if 'email' in request.data:
            email = request.data['email']
            validate_email(email)  # handle_exceptions обработает ValidationError
            user.email = email
            user.username = email
        
        # обновляем номер телефона
        if 'phone_number' in request.data:
            phone = request.data['phone_number']
            if phone:
                if len(phone) < 13:  # +375XXXXXXXXX
                    raise ValidationError("Номер телефона слишком короткий")
                
                if len(phone) > 18:
                    raise ValidationError("Номер телефона слишком длинный")
                
                # проверка на уникальность
                if UserProfile.objects.filter(phone_number=phone).exclude(user=user).exists():
                    raise ValidationError("Этот номер телефона уже используется")
                
                user_profile.phone_number = phone
        
        # сохраняем изменения
        user.save()
        user_profile.save()
        
        return Response({
            "message": "Данные успешно обновлены",
            "user": UserResponseSerializer(user).data
        }, status=status.HTTP_200_OK)
        
    @action(detail=False, methods=['get'])
    @handle_exceptions
    def user_routes(self, request):
        user = request.user
        routes = Route.objects.filter(owner=user)
        return Response(RouteSerializer(routes, many=True).data, status=status.HTTP_200_OK)
    
    @action(detail=False, methods=['post'])
    @handle_exceptions
    def create_route(self, request):
        print("[DEBUG] Входящие данные в create_route view:", request.data)
        try:
            serializer = CreateRouteSerializer(data=request.data, context={'request': request})
            if not serializer.is_valid():
                print("[DEBUG] Ошибки валидации:", serializer.errors)
                return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
            route = serializer.save()
            print("[DEBUG] Маршрут успешно создан в view:", route.id)
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        except Exception as e:
            print("[DEBUG] Необработанная ошибка в create_route:", str(e))
            raise

class CityView(ViewSet):
    
    @action(detail=False, methods=['get'])
    @handle_exceptions
    def get_cities(self, request):
        # получаем параметр country_id из query params
        country_id = request.query_params.get('country_id')
        
        # базовый QuerySet
        cities = City.objects.all()
        
        # фильтруем города по стране, если указан country_id
        if country_id:
            cities = cities.filter(country_id=country_id)
            
        # поиск по названию города
        search = request.query_params.get('search')
        if search:
            cities = cities.filter(name__icontains=search)
            
        # ограничиваем количество результатов и сортируем по имени
        cities = cities.order_by('name')[:100]
        
        return Response(CitySerializer(cities, many=True).data, status=status.HTTP_200_OK)

class CountryView(ViewSet):
    @action(detail=False, methods=['get'])
    @handle_exceptions
    def get_countries(self, request):
        # базовый QuerySet
        countries = Country.objects.all()
        
        # поиск по названию страны
        search = request.query_params.get('search')
        if search:
            countries = countries.filter(
                models.Q(international_name__icontains=search) |
                models.Q(official_name__icontains=search)
            )
        
        # сортируем по международному названию
        countries = countries.order_by('international_name')
        
        return Response(CountrySerializer(countries, many=True).data, status=status.HTTP_200_OK)