from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi

from rest_framework_simplejwt.views import TokenObtainPairView
from rest_framework_simplejwt.tokens import RefreshToken
from django.views.decorators.http import require_http_methods
from rest_framework.response import Response
from rest_framework import status
from rest_framework.permissions import AllowAny, IsAuthenticated
from django.utils import timezone
from django.contrib.auth import get_user_model
from .models import MasterKey
from .models import Conversation
from .models import Message
from .serializers import ConversationSerializer, MessageSerializer
from rest_framework import viewsets, status
from rest_framework.decorators import action
from rest_framework.response import Response
import ollama

User = get_user_model()

class ConversationView(viewsets.ModelViewSet):

    queryset = Conversation.objects.all()
    serializer_class = ConversationSerializer
    permission_classes = [IsAuthenticated]  # JWT token auth required

    def get_queryset(self):
        queryset = Conversation.objects.all()
        return queryset
    
    def perform_create(self, serializer):
        """Associate new product with current user"""
        serializer.save(user=self.request.user)

    @swagger_auto_schema(
        method='get',
        operation_description="Get messages of the conversation",
        responses={
            200: openapi.Response('List of messages', MessageSerializer(many=True)),
            400: 'Bad Request',
            404: 'Conversation not found'
        },
        manual_parameters=[
            openapi.Parameter(
                'category', 
                openapi.IN_QUERY, 
                description="Filter featured items by category",
                type=openapi.TYPE_STRING
            )
        ]
    )
    @action(detail=True, methods=['get'])
    def contents(self, request, pk=None):
        conversation = self.get_object()
        messages = conversation.messages.all()
        return Response(data=list(messages.values()))

    @swagger_auto_schema(
        method='post',
        operation_description="Discutes with the ai",
        request_body=openapi.Schema(
            type=openapi.TYPE_OBJECT,
            properties={
                'content': openapi.Schema(type=openapi.TYPE_STRING, description='Contents of the message'),
            },
            required=['content']
        ),
        responses={
            200: openapi.Response('Message processed successfully', MessageSerializer),
            400: 'Bad Request',
        }
    )
    @action(detail=True, methods=['post'])
    def prompt(self, request, pk=None):
        conversation = self.get_object()
        messages = [{
            "role": "system",
            "content": """
                You must strictly refuse to engage with ANY of the following:
                1. Violence or harm (even fictional or hypothetical scenarios)
                2. ANY explicit, suggestive, or romantic content
                3. Controversial political topics
                4. ANY content that could potentially be misused
                5. Medical, legal, or financial advice
                6. Personal information or privacy violations
                7. Anything that could be remotely offensive to anyone
                
                If you detect such content, immediately respond with:
                "I cannot assist with that request as it appears to be inappropriate. I'm designed to be helpful, but within strict ethical boundaries. Is there something else I can help you with?"
            """
        }]
        for message in conversation.messages.all():
            if message:
                messages.append({
                    "role": message.role,
                    "content": message.content
                })
        messages.append({
            "role": "user",
            "content": request.data.get("content", "")
        })
        res = ollama.chat(model="gemma3", messages=messages)
        Message(role="user", content=request.data.get("content", ""), conversation=conversation).save()
        Message(role="assistant", content=res['message']['content'], conversation=conversation).save()
        return Response(data={
            "content": res['message']['content']
        })



        

class MasterKeyTokenObtainView(TokenObtainPairView):
    permission_classes = [AllowAny]
    
    @swagger_auto_schema(
        operation_description="Creates a token for a user (creates the user if doesn't exists)",
        request_body=openapi.Schema(
            type=openapi.TYPE_OBJECT,
            properties={
                'username': openapi.Schema(type=openapi.TYPE_STRING, description='Identifier of the user'),
                'master_key': openapi.Schema(type=openapi.TYPE_STRING, description='Key of the authorizied application'),
            },
            required=['username', 'master_key']
        ),
        responses={
            200: openapi.Response('API tokens of the user', openapi.Schema(
                type=openapi.TYPE_OBJECT,
                properties={
                    'access': openapi.Schema(type=openapi.TYPE_STRING, description='API access token of the user'),
                    'refresh': openapi.Schema(type=openapi.TYPE_STRING, description='API refresh token of the user'),
                },
                required=['access', 'access']
            )),
            400: 'Bad Request',
            401: 'Bad master key'
        }
    )
    def post(self, request, *args, **kwargs):
        # Get the provided master key from the request
        master_key_value = request.data.get('master_key')
        
        if not master_key_value:
            return Response(
                {'error': 'Master key is required'}, 
                status=status.HTTP_400_BAD_REQUEST
            )
            
        # Verify the master key locally
        try:
            master_key = MasterKey.objects.get(key_value=master_key_value, is_active=True)
        except MasterKey.DoesNotExist:
            return Response(
                {'error': 'Invalid or inactive master key'}, 
                status=status.HTTP_401_UNAUTHORIZED
            )
        
        # Update last used timestamp
        master_key.last_used = timezone.now()
        master_key.save(update_fields=['last_used'])
        
        # Get user identifier from request or use a default
        user_identifier = request.data.get('username', f'service_user_{master_key.key_id}')
        
        # Get or create a user associated with this master key
        user, created = User.objects.get_or_create(
            username=user_identifier,
            defaults={
                'is_active': True
            }
        )
        
        # Generate tokens manually
        refresh = RefreshToken.for_user(user)
        
        # Add custom claims from the master key
        refresh['key_id'] = str(master_key.key_id)
        refresh['permissions'] = master_key.permissions
        
        return Response({
            'refresh': str(refresh),
            'access': str(refresh.access_token),
        })