thrillwiki_django_no_react/backend/apps/api/v1/auth/views.py

"""
Auth domain views for ThrillWiki API v1.

This module contains all authentication-related API endpoints including
login, signup, logout, password management, social authentication,
user profiles, and top lists.
"""

from .serializers.social import (
    ConnectedProviderSerializer,
    AvailableProviderSerializer,
    SocialAuthStatusSerializer,
    ConnectProviderInputSerializer,
    ConnectProviderOutputSerializer,
    DisconnectProviderOutputSerializer,
    SocialProviderErrorSerializer,
)
from apps.accounts.services.social_provider_service import SocialProviderService
from django.contrib.auth import authenticate, login, logout, get_user_model
from django.contrib.sites.shortcuts import get_current_site
from django.core.exceptions import ValidationError
from django.db.models import Q
from typing import Optional, cast  # added 'cast'
from django.http import HttpRequest  # new import
from rest_framework import status
from rest_framework.views import APIView
from rest_framework.request import Request
from rest_framework.response import Response
from rest_framework.permissions import AllowAny, IsAuthenticated
from drf_spectacular.utils import extend_schema, extend_schema_view

# Import from the main serializers.py file (not the serializers package)
from ..serializers import (
    # Authentication serializers
    LoginInputSerializer,
    LoginOutputSerializer,
    SignupInputSerializer,
    SignupOutputSerializer,
    LogoutOutputSerializer,
    UserOutputSerializer,
    PasswordResetInputSerializer,
    PasswordResetOutputSerializer,
    PasswordChangeInputSerializer,
    PasswordChangeOutputSerializer,
    SocialProviderOutputSerializer,
    AuthStatusOutputSerializer,
)

# Handle optional dependencies with fallback classes


class FallbackTurnstileMixin:
    """Fallback mixin if TurnstileMixin is not available."""

    def validate_turnstile(self, request):
        pass


# Try to import the real class, use fallback if not available and ensure it's a class/type
try:
    from apps.accounts.mixins import TurnstileMixin as _ImportedTurnstileMixin

    # Ensure the imported object is a class/type that can be used as a base class.
    # If it's not a type for any reason, fall back to the safe mixin.
    if isinstance(_ImportedTurnstileMixin, type):
        TurnstileMixin = _ImportedTurnstileMixin
    else:
        TurnstileMixin = FallbackTurnstileMixin
except Exception:
    # Catch any import errors or unexpected exceptions and use the fallback mixin.
    TurnstileMixin = FallbackTurnstileMixin

UserModel = get_user_model()

# Helper: safely obtain underlying HttpRequest (used by Django auth)


def _get_underlying_request(request: Request) -> HttpRequest:
    """
    Return a django HttpRequest for use with Django auth and site utilities.

    DRF's Request wraps the underlying HttpRequest in ._request; cast() tells the
    typechecker that the returned object is indeed an HttpRequest.
    """
    return cast(HttpRequest, getattr(request, "_request", request))


# Helper: encapsulate user lookup + authenticate to reduce complexity in view
def _authenticate_user_by_lookup(
    email_or_username: str, password: str, request: Request
) -> Optional[UserModel]:
    """
    Try a single optimized query to find a user by email OR username then authenticate.
    Returns authenticated user or None.
    """
    try:
        # Single query to find user by email OR username
        if "@" in (email_or_username or ""):
            user_obj = (
                UserModel.objects.select_related()
                .filter(Q(email=email_or_username) | Q(username=email_or_username))
                .first()
            )
        else:
            user_obj = (
                UserModel.objects.select_related()
                .filter(Q(username=email_or_username) | Q(email=email_or_username))
                .first()
            )

        if user_obj:
            username_val = getattr(user_obj, "username", None)
            return authenticate(
                # type: ignore[arg-type]
                _get_underlying_request(request),
                username=username_val,
                password=password,
            )
    except Exception:
        # Fallback to authenticate directly with provided identifier
        return authenticate(
            # type: ignore[arg-type]
            _get_underlying_request(request),
            username=email_or_username,
            password=password,
        )

    return None


# === AUTHENTICATION API VIEWS ===


@extend_schema_view(
    post=extend_schema(
        summary="User login",
        description="Authenticate user with username/email and password.",
        request=LoginInputSerializer,
        responses={
            200: LoginOutputSerializer,
            400: "Bad Request",
        },
        tags=["Authentication"],
    ),
)
class LoginAPIView(APIView):
    """API endpoint for user login."""

    permission_classes = [AllowAny]
    authentication_classes = []
    serializer_class = LoginInputSerializer

    def post(self, request: Request) -> Response:
        try:
            # instantiate mixin before calling to avoid type-mismatch in static analysis
            TurnstileMixin().validate_turnstile(request)
        except ValidationError as e:
            return Response({"error": str(e)}, status=status.HTTP_400_BAD_REQUEST)
        except Exception:
            # If mixin doesn't do anything, continue
            pass

        serializer = LoginInputSerializer(data=request.data)
        if serializer.is_valid():
            validated = serializer.validated_data
            # Use .get to satisfy static analyzers
            email_or_username = validated.get("username")  # type: ignore[assignment]
            password = validated.get("password")  # type: ignore[assignment]

            if not email_or_username or not password:
                return Response(
                    {"error": "username and password are required"},
                    status=status.HTTP_400_BAD_REQUEST,
                )

            user = _authenticate_user_by_lookup(email_or_username, password, request)

            if user:
                if getattr(user, "is_active", False):
                    # pass a real HttpRequest to Django login
                    login(_get_underlying_request(request), user)

                    # Generate JWT tokens
                    from rest_framework_simplejwt.tokens import RefreshToken

                    refresh = RefreshToken.for_user(user)
                    access_token = refresh.access_token

                    response_serializer = LoginOutputSerializer(
                        {
                            "access": str(access_token),
                            "refresh": str(refresh),
                            "user": user,
                            "message": "Login successful",
                        }
                    )
                    return Response(response_serializer.data)
                else:
                    return Response(
                        {"error": "Account is disabled"},
                        status=status.HTTP_400_BAD_REQUEST,
                    )
            else:
                return Response(
                    {"error": "Invalid credentials"},
                    status=status.HTTP_400_BAD_REQUEST,
                )

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


@extend_schema_view(
    post=extend_schema(
        summary="User registration",
        description="Register a new user account.",
        request=SignupInputSerializer,
        responses={
            201: SignupOutputSerializer,
            400: "Bad Request",
        },
        tags=["Authentication"],
    ),
)
class SignupAPIView(APIView):
    """API endpoint for user registration."""

    permission_classes = [AllowAny]
    authentication_classes = []
    serializer_class = SignupInputSerializer

    def post(self, request: Request) -> Response:
        try:
            # instantiate mixin before calling to avoid type-mismatch in static analysis
            TurnstileMixin().validate_turnstile(request)
        except ValidationError as e:
            return Response({"error": str(e)}, status=status.HTTP_400_BAD_REQUEST)
        except Exception:
            # If mixin doesn't do anything, continue
            pass

        serializer = SignupInputSerializer(data=request.data)
        if serializer.is_valid():
            user = serializer.save()
            # pass a real HttpRequest to Django login
            login(_get_underlying_request(request), user)  # type: ignore[arg-type]

            # Generate JWT tokens
            from rest_framework_simplejwt.tokens import RefreshToken

            refresh = RefreshToken.for_user(user)
            access_token = refresh.access_token

            response_serializer = SignupOutputSerializer(
                {
                    "access": str(access_token),
                    "refresh": str(refresh),
                    "user": user,
                    "message": "Registration successful",
                }
            )
            return Response(response_serializer.data, status=status.HTTP_201_CREATED)

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


@extend_schema_view(
    post=extend_schema(
        summary="User logout",
        description="Logout the current user and blacklist their refresh token.",
        responses={
            200: LogoutOutputSerializer,
            401: "Unauthorized",
        },
        tags=["Authentication"],
    ),
)
class LogoutAPIView(APIView):
    """API endpoint for user logout."""

    permission_classes = [IsAuthenticated]
    serializer_class = LogoutOutputSerializer

    def post(self, request: Request) -> Response:
        try:
            # Get refresh token from request data with proper type handling
            refresh_token = None
            if hasattr(request, 'data') and request.data is not None:
                data = getattr(request, 'data', {})
                if hasattr(data, 'get'):
                    refresh_token = data.get("refresh")

            if refresh_token and isinstance(refresh_token, str):
                # Blacklist the refresh token
                from rest_framework_simplejwt.tokens import RefreshToken
                try:
                    # Create RefreshToken from string and blacklist it
                    refresh_token_obj = RefreshToken(
                        refresh_token)  # type: ignore[arg-type]
                    refresh_token_obj.blacklist()
                except Exception:
                    # Token might be invalid or already blacklisted
                    pass

            # Also delete the old token for backward compatibility
            if hasattr(request.user, "auth_token"):
                request.user.auth_token.delete()

            # Logout from session using the underlying HttpRequest
            logout(_get_underlying_request(request))

            response_serializer = LogoutOutputSerializer(
                {"message": "Logout successful"}
            )
            return Response(response_serializer.data)
        except Exception:
            return Response(
                {"error": "Logout failed"}, status=status.HTTP_500_INTERNAL_SERVER_ERROR
            )


@extend_schema_view(
    get=extend_schema(
        summary="Get current user",
        description="Retrieve information about the currently authenticated user.",
        responses={
            200: UserOutputSerializer,
            401: "Unauthorized",
        },
        tags=["Authentication"],
    ),
)
class CurrentUserAPIView(APIView):
    """API endpoint to get current user information."""

    permission_classes = [IsAuthenticated]
    serializer_class = UserOutputSerializer

    def get(self, request: Request) -> Response:
        serializer = UserOutputSerializer(request.user)
        return Response(serializer.data)


@extend_schema_view(
    post=extend_schema(
        summary="Request password reset",
        description="Send a password reset email to the user.",
        request=PasswordResetInputSerializer,
        responses={
            200: PasswordResetOutputSerializer,
            400: "Bad Request",
        },
        tags=["Authentication"],
    ),
)
class PasswordResetAPIView(APIView):
    """API endpoint to request password reset."""

    permission_classes = [AllowAny]
    serializer_class = PasswordResetInputSerializer

    def post(self, request: Request) -> Response:
        serializer = PasswordResetInputSerializer(
            data=request.data, context={"request": request}
        )
        if serializer.is_valid():
            serializer.save()

            response_serializer = PasswordResetOutputSerializer(
                {"detail": "Password reset email sent"}
            )
            return Response(response_serializer.data)

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


@extend_schema_view(
    post=extend_schema(
        summary="Change password",
        description="Change the current user's password.",
        request=PasswordChangeInputSerializer,
        responses={
            200: PasswordChangeOutputSerializer,
            400: "Bad Request",
            401: "Unauthorized",
        },
        tags=["Authentication"],
    ),
)
class PasswordChangeAPIView(APIView):
    """API endpoint to change password."""

    permission_classes = [IsAuthenticated]
    serializer_class = PasswordChangeInputSerializer

    def post(self, request: Request) -> Response:
        serializer = PasswordChangeInputSerializer(
            data=request.data, context={"request": request}
        )
        if serializer.is_valid():
            serializer.save()

            response_serializer = PasswordChangeOutputSerializer(
                {"detail": "Password changed successfully"}
            )
            return Response(response_serializer.data)

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


@extend_schema_view(
    get=extend_schema(
        summary="Get social providers",
        description="Retrieve available social authentication providers.",
        responses={200: "List of social providers"},
        tags=["Authentication"],
    ),
)
class SocialProvidersAPIView(APIView):
    """API endpoint to get available social authentication providers."""

    permission_classes = [AllowAny]
    serializer_class = SocialProviderOutputSerializer

    def get(self, request: Request) -> Response:
        from django.core.cache import cache

        # get_current_site expects a django HttpRequest; _get_underlying_request now returns HttpRequest
        site = get_current_site(_get_underlying_request(request))

        # Cache key based on site and request host - use getattr to avoid attribute errors
        site_id = getattr(site, "id", getattr(site, "pk", None))
        cache_key = f"social_providers:{site_id}:{request.get_host()}"

        # Try to get from cache first (cache for 15 minutes)
        cached_providers = cache.get(cache_key)
        if cached_providers is not None:
            return Response(cached_providers)

        providers_list = []

        # Optimized query: filter by site and order by provider name
        from allauth.socialaccount.models import SocialApp

        social_apps = SocialApp.objects.filter(sites=site).order_by("provider")

        for social_app in social_apps:
            try:
                provider_name = (
                    social_app.name or getattr(social_app, "provider", "").title()
                )

                auth_url = request.build_absolute_uri(
                    f"/accounts/{social_app.provider}/login/"
                )

                providers_list.append(
                    {
                        "id": social_app.provider,
                        "name": provider_name,
                        "authUrl": auth_url,
                    }
                )

            except Exception:
                continue

        serializer = SocialProviderOutputSerializer(providers_list, many=True)
        response_data = serializer.data

        cache.set(cache_key, response_data, 900)

        return Response(response_data)


@extend_schema_view(
    post=extend_schema(
        summary="Check authentication status",
        description="Check if user is authenticated and return user data.",
        responses={200: AuthStatusOutputSerializer},
        tags=["Authentication"],
    ),
)
class AuthStatusAPIView(APIView):
    """API endpoint to check authentication status."""

    permission_classes = [AllowAny]
    serializer_class = AuthStatusOutputSerializer

    def post(self, request: Request) -> Response:
        if request.user.is_authenticated:
            response_data = {
                "authenticated": True,
                "user": request.user,
            }
        else:
            response_data = {
                "authenticated": False,
                "user": None,
            }

        serializer = AuthStatusOutputSerializer(response_data)
        return Response(serializer.data)


# === SOCIAL PROVIDER MANAGEMENT API VIEWS ===


@extend_schema_view(
    get=extend_schema(
        summary="Get available social providers",
        description="Retrieve list of available social authentication providers.",
        responses={
            200: AvailableProviderSerializer(many=True),
        },
        tags=["Social Authentication"],
    ),
)
class AvailableProvidersAPIView(APIView):
    """API endpoint to get available social providers."""

    permission_classes = [AllowAny]
    serializer_class = AvailableProviderSerializer

    def get(self, request: Request) -> Response:
        providers = [
            {
                "provider": "google",
                "name": "Google",
                "login_url": "/auth/social/google/",
                "connect_url": "/auth/social/connect/google/",
            },
            {
                "provider": "discord",
                "name": "Discord",
                "login_url": "/auth/social/discord/",
                "connect_url": "/auth/social/connect/discord/",
            }
        ]

        serializer = AvailableProviderSerializer(providers, many=True)
        return Response(serializer.data)


@extend_schema_view(
    get=extend_schema(
        summary="Get connected social providers",
        description="Retrieve list of social providers connected to the user's account.",
        responses={
            200: ConnectedProviderSerializer(many=True),
            401: "Unauthorized",
        },
        tags=["Social Authentication"],
    ),
)
class ConnectedProvidersAPIView(APIView):
    """API endpoint to get user's connected social providers."""

    permission_classes = [IsAuthenticated]
    serializer_class = ConnectedProviderSerializer

    def get(self, request: Request) -> Response:
        service = SocialProviderService()
        providers = service.get_connected_providers(request.user)

        serializer = ConnectedProviderSerializer(providers, many=True)
        return Response(serializer.data)


@extend_schema_view(
    post=extend_schema(
        summary="Connect social provider",
        description="Connect a social authentication provider to the user's account.",
        request=ConnectProviderInputSerializer,
        responses={
            200: ConnectProviderOutputSerializer,
            400: SocialProviderErrorSerializer,
            401: "Unauthorized",
        },
        tags=["Social Authentication"],
    ),
)
class ConnectProviderAPIView(APIView):
    """API endpoint to connect a social provider."""

    permission_classes = [IsAuthenticated]
    serializer_class = ConnectProviderInputSerializer

    def post(self, request: Request, provider: str) -> Response:
        # Validate provider
        if provider not in ['google', 'discord']:
            return Response(
                {
                    "success": False,
                    "error": "INVALID_PROVIDER",
                    "message": f"Provider '{provider}' is not supported",
                    "suggestions": ["Use 'google' or 'discord'"]
                },
                status=status.HTTP_400_BAD_REQUEST
            )

        serializer = ConnectProviderInputSerializer(data=request.data)
        if not serializer.is_valid():
            return Response(
                {
                    "success": False,
                    "error": "VALIDATION_ERROR",
                    "message": "Invalid request data",
                    "details": serializer.errors,
                    "suggestions": ["Provide a valid access_token"]
                },
                status=status.HTTP_400_BAD_REQUEST
            )

        access_token = serializer.validated_data['access_token']

        try:
            service = SocialProviderService()
            result = service.connect_provider(request.user, provider, access_token)

            response_serializer = ConnectProviderOutputSerializer(result)
            return Response(response_serializer.data)

        except Exception as e:
            return Response(
                {
                    "success": False,
                    "error": "CONNECTION_FAILED",
                    "message": str(e),
                    "suggestions": [
                        "Verify the access token is valid",
                        "Ensure the provider account is not already connected to another user"
                    ]
                },
                status=status.HTTP_400_BAD_REQUEST
            )


@extend_schema_view(
    post=extend_schema(
        summary="Disconnect social provider",
        description="Disconnect a social authentication provider from the user's account.",
        responses={
            200: DisconnectProviderOutputSerializer,
            400: SocialProviderErrorSerializer,
            401: "Unauthorized",
        },
        tags=["Social Authentication"],
    ),
)
class DisconnectProviderAPIView(APIView):
    """API endpoint to disconnect a social provider."""

    permission_classes = [IsAuthenticated]
    serializer_class = DisconnectProviderOutputSerializer

    def post(self, request: Request, provider: str) -> Response:
        # Validate provider
        if provider not in ['google', 'discord']:
            return Response(
                {
                    "success": False,
                    "error": "INVALID_PROVIDER",
                    "message": f"Provider '{provider}' is not supported",
                    "suggestions": ["Use 'google' or 'discord'"]
                },
                status=status.HTTP_400_BAD_REQUEST
            )

        try:
            service = SocialProviderService()

            # Check if disconnection is safe
            can_disconnect, reason = service.can_disconnect_provider(
                request.user, provider)
            if not can_disconnect:
                return Response(
                    {
                        "success": False,
                        "error": "UNSAFE_DISCONNECTION",
                        "message": reason,
                        "suggestions": [
                            "Set up email/password authentication before disconnecting",
                            "Connect another social provider before disconnecting this one"
                        ]
                    },
                    status=status.HTTP_400_BAD_REQUEST
                )

            # Perform disconnection
            result = service.disconnect_provider(request.user, provider)

            response_serializer = DisconnectProviderOutputSerializer(result)
            return Response(response_serializer.data)

        except Exception as e:
            return Response(
                {
                    "success": False,
                    "error": "DISCONNECTION_FAILED",
                    "message": str(e),
                    "suggestions": [
                        "Verify the provider is currently connected",
                        "Ensure you have alternative authentication methods"
                    ]
                },
                status=status.HTTP_400_BAD_REQUEST
            )


@extend_schema_view(
    get=extend_schema(
        summary="Get social authentication status",
        description="Get comprehensive social authentication status for the user.",
        responses={
            200: SocialAuthStatusSerializer,
            401: "Unauthorized",
        },
        tags=["Social Authentication"],
    ),
)
class SocialAuthStatusAPIView(APIView):
    """API endpoint to get social authentication status."""

    permission_classes = [IsAuthenticated]
    serializer_class = SocialAuthStatusSerializer

    def get(self, request: Request) -> Response:
        service = SocialProviderService()
        auth_status = service.get_auth_status(request.user)

        serializer = SocialAuthStatusSerializer(auth_status)
        return Response(serializer.data)


# Note: User Profile, Top List, and Top List Item ViewSets are now handled
# by the dedicated accounts app at backend/apps/api/v1/accounts/views.py
# to avoid duplication and maintain clean separation of concerns.