from django.shortcuts import render

import datetime
import json
from collections import OrderedDict

from django.db.models import Q
from django.utils.decorators import method_decorator
from django.views.decorators.cache import cache_page
from rest_framework.generics import ListAPIView
from rest_framework.permissions import IsAuthenticated, AllowAny
from rest_framework.response import Response
from rest_framework.views import APIView, status
from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi

from apps.account.models import User
from apps.dobodbi_calendar.models import CalendarOccasions
from apps.dobodbi_calendar.serializer import CalendarSerializer
from utils.config_getter import get_config
from utils.pagination import StandardResultsSetPagination


class CalendarList(ListAPIView):
    serializer_class = CalendarSerializer
    pagination_class = StandardResultsSetPagination

    permission_classes = (AllowAny,)

    @swagger_auto_schema(
        operation_description="Get list of calendar occasions",
        tags=["Dobodbi - Calendar"],
        manual_parameters=[
            openapi.Parameter(
                'last_updated', openapi.IN_QUERY,
                description="Filter occasions updated after this timestamp",
                type=openapi.TYPE_STRING,
                required=False
            )
        ],
        responses={
            200: openapi.Response(
                description="List of calendar occasions with metadata"
            )
        }
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    # @method_decorator(cache_page(60 * 15))  # Cache for 1 Hour
    # def dispatch(self, *args, **kwargs):
    #     return super().dispatch(*args, **kwargs)

    def get_queryset(self):
        queryset = CalendarOccasions.objects.all()
        req = self.request

        if v := req.query_params.get('last_updated'):
            query &= Q(
                updated_at__gte=v
            )

        return queryset


    def list(self, request, *args, **kwargs):
        q = self.get_queryset()
        last_item_date = q.first()
        if last_item_date:
            last_updated = last_item_date.updated_at + datetime.timedelta(microseconds=1)
            last_updated = str(last_updated)
        else:
            last_updated = None

        d = self.get_serializer(q, many=True).data
        data = OrderedDict({
            'last_updated': last_updated,
            'total': len(d),
            'data': d,
        })
        return Response(data)


class AdjustmentConfigView(APIView):
    permission_classes = (AllowAny,)

    @swagger_auto_schema(
        operation_description="Get calendar adjustment configuration",
        tags=["Dobodbi - Calendar"],
        responses={
            200: openapi.Response(
                description="Calendar adjustment configuration"
            )
        }
    )
    def get(self, request):
        adjustment_config = get_config('calendar__Adjustment')
        return Response(json.loads(adjustment_config))

class OccasionsList(ListAPIView):
    serializer_class = CalendarSerializer
    pagination_class = StandardResultsSetPagination
    permission_classes = (AllowAny,)

    @swagger_auto_schema(
        operation_description="Get list of calendar occasions. Can filter by month.",
        tags=["Dobodbi - Calendar"],
        manual_parameters=[
            openapi.Parameter(
                'month', openapi.IN_QUERY,
                description="Filter by month number (e.g. 1, 02, 12)",
                type=openapi.TYPE_STRING,
                required=False
            ),
            openapi.Parameter(
                'last_updated', openapi.IN_QUERY,
                description="Filter occasions updated after this timestamp",
                type=openapi.TYPE_STRING,
                required=False
            )
        ],
        responses={
            200: openapi.Response(
                description="List of calendar occasions"
            )
        }
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        queryset = CalendarOccasions.objects.all()
        req = self.request

        # 1. Month Filter Logic
        month = req.query_params.get('month')
        if month:
            # Ensure month is two digits (e.g., '2' -> '02') to match your JSON data
            month_str = str(month).zfill(2)
            
            # This looks inside the JSON array. 
            # It finds rows where the JSON list contains an object with this exact key/value.
            queryset = queryset.filter(dates__contains=[{'month': month_str}])

        # 2. Last Updated Filter Logic
        if v := req.query_params.get('last_updated'):
            queryset = queryset.filter(updated_at__gte=v)

        return queryset

    def list(self, request, *args, **kwargs):
        q = self.get_queryset()
        
        # Calculate last_updated based on the specific filtered result
        last_item_date = q.order_by('-updated_at').first()
        
        if last_item_date:
            last_updated = last_item_date.updated_at + datetime.timedelta(microseconds=1)
            last_updated = str(last_updated)
        else:
            last_updated = None

        # Standard pagination handling (since you are inheriting ListAPIView)
        page = self.paginate_queryset(q)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)

        # Fallback if pagination is disabled
        d = self.get_serializer(q, many=True).data
        data = OrderedDict({
            'last_updated': last_updated,
            'total': len(d),
            'data': d,
        })
        return Response(data)