from django.contrib.admin.utils import lookup_field
from django.db.models import Prefetch, Q
from rest_framework.generics import ListAPIView , RetrieveAPIView
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.permissions import AllowAny
from django.shortcuts import get_object_or_404
from django.db.models import F
from drf_yasg.utils import swagger_auto_schema

from ..models import Transmitters, HadisTransmitter
from ..serializers import NarratorRelationSerializer
from utils.pagination import StandardResultsSetPagination
from ..models import Transmitters, TransmitterOpinion, TransmitterOriginalText, Hadis, OriginalTextReference, OriginalTextReferenceImage
from ..serializers import TransmitterSerializer, TransmitterDetailSerializer, TransmitterSyncSerializer, TransmitterOpinionSerializer, TransmitterOriginalTextSerializer, TransmitterOriginalTextDetailSerializer, HadisListSerializer
from ..docs import transmitter_filters_swagger,transmitter_list_swagger, transmitter_detail_swagger, transmitter_sync_swagger, transmitter_opinion_swagger, transmitter_original_text_swagger
from utils.pagination import NoPagination
from .category import get_localized_text
from ..serializers import HadisListSerializer
from drf_yasg.utils import swagger_auto_schema
class TransmitterFliterView(ListAPIView):
    pass

class TransmitterView(ListAPIView):
    queryset = Transmitters.objects.all()
    serializer_class = TransmitterSerializer
    pagination_class = StandardResultsSetPagination

    @transmitter_list_swagger
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        queryset = Transmitters.objects.all()

        # Get query parameters
        search_query = self.request.query_params.get('search', None)
        status_filter = self.request.query_params.get('status', None)
        madhhab_filter = self.request.query_params.get('madhhab', None)
        generation_filter = self.request.query_params.get('generation', None)

        # 1. Apply search filter (Searching across name-related JSONFields, slug, legacy_id)
        if search_query:
            from utils.text_normalizer import normalize_for_search
            norm_q = normalize_for_search(search_query)
            q_filter = (
                Q(normalized_text__icontains=norm_q) |
                Q(full_name__icontains=search_query) |
                Q(kunya__icontains=search_query) |
                Q(known_as__icontains=search_query) |
                Q(nickname__icontains=search_query) |
                Q(slug__icontains=search_query) |
                Q(legacy_id__icontains=search_query)
            )
            if search_query.isdigit():
                q_filter |= Q(legacy_number=int(search_query)) | Q(generation=int(search_query))
            queryset = queryset.filter(q_filter)

        # 2. Apply categorical filters
        if status_filter:
            queryset = queryset.filter(reliability__slug=status_filter)

        if madhhab_filter:
            queryset = queryset.filter(madhhab=madhhab_filter)

        if generation_filter:
            queryset = queryset.filter(generation=generation_filter)

        return queryset

class TransmitterDetailView(RetrieveAPIView):
    serializer_class = TransmitterDetailSerializer
    lookup_field = 'slug'
    lookup_url_kwarg = 'narrator_slug'

    @transmitter_detail_swagger
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        input = self.kwargs.get('narrator_slug')
        return Transmitters.objects.filter(slug=input)

class TransmitterOpinionView(ListAPIView):
    serializer_class = TransmitterOpinionSerializer
    pagination_class = StandardResultsSetPagination

    @transmitter_opinion_swagger
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def get_queryset(self):
        narrator_slug = self.kwargs.get('narrator_slug')
        return TransmitterOpinion.objects.filter(
            transmitter__slug=narrator_slug
        ).select_related(
            'transmitter',  # Essential if serializer includes transmitter data
            'status'  # Added for the new OpinionStatus ForeignKey
        ).prefetch_related(
            # Add any nested relations from TransmitterOriginalTextSerializer
            # 'translations',
            # 'manuscript_references',
        )


class TransmitterOriginalTextView(ListAPIView):
    serializer_class = TransmitterOriginalTextDetailSerializer
    pagination_class = StandardResultsSetPagination

    @transmitter_original_text_swagger
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def get_queryset(self):
        narrator_slug = self.kwargs.get('narrator_slug')
        
        return TransmitterOriginalText.objects.filter(
            transmitter__slug=narrator_slug
        ).select_related(
            'transmitter'
        ).prefetch_related(
            Prefetch(
                'references',
                queryset=OriginalTextReference.objects.select_related(
                    'book_reference',
                    'book_reference__author',
                    'edition',
                    'book_volume',
                    'book_volume__edition'
                ).prefetch_related(
                    Prefetch('images', queryset=OriginalTextReferenceImage.objects.order_by('priority')),
                    'book_reference__editions'
                )
            )
        )



class TransmitterSyncView(ListAPIView):
    """
    API view to sync all transmitter data for offline mode
    Returns all transmitters with biographical data, opinions, and exact flat relation IDs.
    """
    serializer_class = TransmitterSyncSerializer
    pagination_class = NoPagination

    @transmitter_sync_swagger
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def get_queryset(self):
        from ..models import TransmitterOriginalText, TransmitterRelative
        
        return (
            Transmitters.objects
            # 👇 ۱. واکشی اطلاعات reliability راوی در همان کوئری اصلی
            .select_related('reliability')
            .prefetch_related(
                # 👇 ۲. اضافه کردن 'scholar' برای جلوگیری از کوئری اضافه در نظرات دانشمندان
                Prefetch('opinions', queryset=TransmitterOpinion.objects.select_related('status', 'scholar')),
                
                Prefetch(
                    'originaltexts', 
                    # 👇 ۳. اضافه کردن 'transmitter' برای جلوگیری از کوئری چرخشی در DetailSerializer متون اصلی
                    queryset=TransmitterOriginalText.objects.select_related('transmitter').prefetch_related(
                        'references__book_reference__author',
                        'references__edition',
                        'references__book_volume',
                        'references__images'
                    )
                ),
                Prefetch('relatives', queryset=TransmitterRelative.objects.select_related('narrator'))
            )
            .order_by('id')
        )

    def list(self, request, *args, **kwargs):
        # 🧠 ۱. واکشی لینک‌ها با values_list برای جلوگیری از هرگونه تداخل دیکشنری و افزایش سرعت
        all_links = HadisTransmitter.objects.values_list(
            'hadis_id', 'chain_index', 'order', 'transmitter_id', 'hadis__category_id'
        )
        
        # 🧠 ۲. بازسازی کل زنجیره‌های حدیثی به صورت کاملاً ایمن و عددی
        chains = {}
        categories_map = {}
        for hadis_id, chain_index, order, transmitter_id, category_id in all_links:
            if transmitter_id is None:
                continue
                
            tx_id = int(transmitter_id)
            
            if tx_id not in categories_map:
                categories_map[tx_id] = set()
            if category_id is not None:
                categories_map[tx_id].add(int(category_id))
                
            key = (int(hadis_id), int(chain_index))
            if key not in chains:
                chains[key] = {}
            chains[key][int(order)] = tx_id

        # دایرکتوری‌های نگاشت روابط
        teachers_map = {}
        students_map = {}

        # 🧠 ۳. پردازش خطی ساختار درختواره 
        for key, orders in chains.items():
            for order, tx_id in orders.items():
                if tx_id not in teachers_map:
                    teachers_map[tx_id] = set()
                if tx_id not in students_map:
                    students_map[tx_id] = set()
                
                # استاد (پوزیشن قبلی در ترتیب روایی / order + 1)
                if (order + 1) in orders:
                    teachers_map[tx_id].add(orders[order + 1])
                
                # شاگرد (پوزیشن بعدی در ترتیب روایی / order - 1)
                if (order - 1) in orders:
                    students_map[tx_id].add(orders[order - 1])

        queryset = self.get_queryset()
        
        # 🧠 ۴. تزریق اجباری کانتکست به سریالایزر (جلوگیری از اوررایت شدن توسط DRF)
        context = self.get_serializer_context()
        context['teachers_map'] = teachers_map
        context['students_map'] = students_map
        context['categories_map'] = categories_map
        
        serializer = self.get_serializer_class()(
            queryset, 
            many=True, 
            context=context
        )

        response_data = {
            'count': len(serializer.data),
            'filters': get_transmitter_filters(request),
            'results': serializer.data
        }

        return Response(response_data)


def get_transmitter_filters(request):
    # Get all unique generations
    generations = Transmitters.objects.exclude(generation__isnull=True).values_list('generation', flat=True).distinct().order_by('generation')

    # Get madhhab choices
    madhabs = []
    for choice in Transmitters.MadhhabChoices:
        madhabs.append(choice.value)

    # Get reliabilities from TransmitterReliability model
    from ..models.transmitter import TransmitterReliability
    reliabilities = []
    for reliability in TransmitterReliability.objects.all().order_by('id'):
        if reliability.title:
            reliabilities.append({
                'id': reliability.id,
                'text': get_localized_text(reliability.title, request),
                'title': get_localized_text(reliability.title, request),
                'slug': reliability.slug,
                'color': reliability.color,
                'main_color_code': reliability.main_color_code,
            })

    return {
        'generations': list(generations),
        'madhabs': madhabs,
        'reliabilities': reliabilities
    }


class TransmitterFiltersView(ListAPIView):
    """
    API view to return filter data for transmitters
    Returns generations, madhabs, and reliabilities for filtering
    """
    pagination_class = NoPagination

    @transmitter_filters_swagger
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def get_queryset(self):
        # This view doesn't need a queryset, it returns computed data
        return Transmitters.objects.none()

    def list(self, request, *args, **kwargs):
        return Response(get_transmitter_filters(request))

from ..serializers.category import CategorySerializer
from ..models.category import HadisCategory

class NarratorArgumentsListView(ListAPIView):
    """
    API view to list all Hadis Categories where a specific narrator 
    exists in the transmission chain of hadiths within that category.
    """
    serializer_class = CategorySerializer
    pagination_class = StandardResultsSetPagination
    # در صورت نیاز به احراز هویت می‌توانید کامنت زیر را باز کنید:
    # authentication_classes = [TokenAuthentication]

    @swagger_auto_schema(
        operation_summary="Narrator Arguments List (Categories)",
        operation_description="Returns a paginated list of Hadis Categories for a specific narrator based on the hadiths they appear in.",
        tags=['Dobodbi - Hadis (V2)'],
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        narrator_slug = self.kwargs.get('narrator_slug')
        
        # فیلتر کردن دسته‌بندی‌هایی که در آن‌ها حدیث فعالی وجود دارد که این راوی در زنجیره آن حضور دارد
        return HadisCategory.objects.filter(
            hadis__transmitters__transmitter__slug=narrator_slug,
            hadis__status=True
        ).distinct().order_by('id')


# class NarratorRelationsView(APIView):
#     """
#     API view to get the Teachers and Students of a specific narrator 
#     based on their position in Hadith transmission chains.
#     """
#     permission_classes = [AllowAny]

#     @swagger_auto_schema(
#         operation_summary="Get Narrator Teachers and Students",
#         operation_description="Analyzes transmission chains to find the teachers (order + 1) and students (order - 1) of a narrator.",
#         tags=['Dobodbi - Hadis (V2)'],
#     )
#     def get(self, request, narrator_slug, *args, **kwargs):
#         # 1. پیدا کردن راوی اصلی
#         narrator = get_object_or_404(Transmitters, slug=narrator_slug)

#         # 2. پیدا کردن تمام اتصالاتی که این راوی در آن‌ها حضور دارد
#         narrator_links = HadisTransmitter.objects.filter(transmitter=narrator)

#         teacher_ids = set()
#         student_ids = set()

#         # 3. تحلیل زنجیره‌ها برای پیدا کردن اساتید و شاگردان
#         for link in narrator_links:
#             # استاد = کسی که در همان حدیث و همان زنجیره، Order او یکی بیشتر از راوی ماست
#             teacher_link = HadisTransmitter.objects.filter(
#                 hadis_id=link.hadis_id,
#                 chain_index=link.chain_index,
#                 order=link.order + 1
#             ).first()
#             if teacher_link:
#                 teacher_ids.add(teacher_link.transmitter_id)

#             # شاگرد = کسی که در همان حدیث و همان زنجیره، Order او یکی کمتر از راوی ماست
#             student_link = HadisTransmitter.objects.filter(
#                 hadis_id=link.hadis_id,
#                 chain_index=link.chain_index,
#                 order=link.order - 1
#             ).first()
#             if student_link:
#                 student_ids.add(student_link.transmitter_id)

#         # 4. واکشی اطلاعات اساتید و شاگردان از دیتابیس به صورت یکجا
#         teachers_qs = Transmitters.objects.filter(id__in=teacher_ids)
#         students_qs = Transmitters.objects.filter(id__in=student_ids)

#         # 5. سریالایز کردن داده‌ها با در نظر گرفتن زبان ریکوئست
#         teachers_data = NarratorRelationSerializer(teachers_qs, many=True, context={'request': request}).data
#         students_data = NarratorRelationSerializer(students_qs, many=True, context={'request': request}).data

#         # 6. بازگرداندن پاسخ
#         return Response({
#             "narrator_slug": narrator.slug,
#             "teachers_count": len(teachers_data),
#             "students_count": len(students_data),
#             "teachers": teachers_data,
#             "students": students_data
#         })

from django.db.models import Exists, OuterRef # 👈 حتما این دو را ایمپورت کنید
from drf_yasg import openapi

class NarratorTeachersView(ListAPIView):
    """
    API view to get the Teachers of a specific narrator 
    based on their position in Hadith transmission chains.
    Optimized to run fully inside the database.
    """
    serializer_class = NarratorRelationSerializer
    pagination_class = StandardResultsSetPagination
    permission_classes = [AllowAny]

    @swagger_auto_schema(
        operation_summary="Get Narrator Teachers",
        operation_description="Analyzes transmission chains to find the teachers (order + 1) of a narrator, with optional search.",
        tags=['Dobodbi - Hadis (V2)'],
        manual_parameters=[
            openapi.Parameter('search', openapi.IN_QUERY, description="Search term for narrator's name", type=openapi.TYPE_STRING),
        ]
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        narrator_slug = self.kwargs.get('narrator_slug')
        narrator = get_object_or_404(Transmitters, slug=narrator_slug)

        is_teacher_subquery = HadisTransmitter.objects.filter(
            transmitter=narrator,
            hadis_id=OuterRef('hadis_id'),
            chain_index=OuterRef('chain_index'),
            order=OuterRef('order') - 1  # استاد یعنی Order او یکی کمتر از راوی تارگت باشد
        )

        teacher_ids = HadisTransmitter.objects.annotate(
            is_teacher=Exists(is_teacher_subquery)
        ).filter(is_teacher=True).values_list('transmitter_id', flat=True).distinct()

        queryset = Transmitters.objects.filter(id__in=teacher_ids).select_related('reliability')

        search_query = self.request.query_params.get('search', None)
        if search_query:
            from utils.text_normalizer import normalize_for_search
            norm_q = normalize_for_search(search_query)
            queryset = queryset.filter(
                Q(normalized_text__icontains=norm_q) |
                Q(full_name__icontains=search_query) |
                Q(kunya__icontains=search_query) |
                Q(known_as__icontains=search_query) |
                Q(nickname__icontains=search_query)
            )

        return queryset


class NarratorStudentsView(ListAPIView):
    """
    API view to get the Students of a specific narrator 
    based on their position in Hadith transmission chains.
    Optimized to run fully inside the database.
    """
    serializer_class = NarratorRelationSerializer
    pagination_class = StandardResultsSetPagination
    permission_classes = [AllowAny]

    @swagger_auto_schema(
        operation_summary="Get Narrator Students",
        operation_description="Analyzes transmission chains to find the students (order - 1) of a narrator, with optional search.",
        tags=['Dobodbi - Hadis (V2)'],
        manual_parameters=[
            openapi.Parameter('search', openapi.IN_QUERY, description="Search term for narrator's name", type=openapi.TYPE_STRING),
        ]
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        narrator_slug = self.kwargs.get('narrator_slug')
        narrator = get_object_or_404(Transmitters, slug=narrator_slug)

        is_student_subquery = HadisTransmitter.objects.filter(
            transmitter=narrator,
            hadis_id=OuterRef('hadis_id'),
            chain_index=OuterRef('chain_index'),
            order=OuterRef('order') + 1  # شاگرد یعنی Order او یکی بیشتر باشد
        )

        student_ids = HadisTransmitter.objects.annotate(
            is_student=Exists(is_student_subquery)
        ).filter(is_student=True).values_list('transmitter_id', flat=True).distinct()

        queryset = Transmitters.objects.filter(id__in=student_ids).select_related('reliability')

        search_query = self.request.query_params.get('search', None)
        if search_query:
            from utils.text_normalizer import normalize_for_search
            norm_q = normalize_for_search(search_query)
            queryset = queryset.filter(
                Q(normalized_text__icontains=norm_q) |
                Q(full_name__icontains=search_query) |
                Q(kunya__icontains=search_query) |
                Q(known_as__icontains=search_query) |
                Q(nickname__icontains=search_query)
            )

        return queryset

from ..serializers.hadis import TransmitterOriginalTextDetailSerializer

class TransmitterOriginalTextDetailView(RetrieveAPIView):
    """API View to get full details of a specific TransmitterOriginalText by slug"""
    serializer_class = TransmitterOriginalTextDetailSerializer
    lookup_field = 'slug'
    lookup_url_kwarg = 'original_text_slug'
    permission_classes = [AllowAny]

    @swagger_auto_schema(
        operation_summary="Get Original Text Detail",
        operation_description="Returns the full details of a specific original text belonging to a narrator, including its content, translations, and book references.",
        tags=['Dobodbi - Hadis (V2)'],
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        return TransmitterOriginalText.objects.all().select_related(
            'transmitter'
        ).prefetch_related(
            'references__book_reference__author',
            'references__edition',
            'references__book_volume',
            'references__images'
        )