from collections import defaultdict

from django.contrib.postgres.aggregates import ArrayAgg
from django.db.models import Q
from rest_framework import serializers, status

from api.helper.resource_map_helper import helper_recalculate_and_get_redis_resource_map
from api.models import AuditTrail, AuditTrailDetails, TtStudentSet, TtSetting, TtStudent
from api.views.admin.base import AdminApiBase
from api.validator import BaseValidator
from api.utils import decrypt_aes_128_cbc, encrypt_aes_128_cbc, log_critical_error, get_exception_detail, \
    bulk_sync_to_redis, get_ip
from rest_framework.exceptions import ValidationError
from api.translation import __
from backend.kafka import send_request
from backend.redis_client import redis_client


class StudentSetDelete(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "id": "required|array|exists:api.TtStudentSet,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get student_set by id, if wrong id direct return error
        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)
        # custom error after basic validation

        if error:
            raise ValidationError(error)

    def post(self, request):
        # Validate input
        try:
            self.validate_request(request)
            setting_params = {
                "slot_per_week",
            }
            settings = TtSetting.get_multiple_setting(setting_params)
            slot_per_week = int(settings["slot_per_week"])
            action = "student_set_delete"
            ids = request.data.get("id")

            student_set = TtStudentSet.objects.filter(id__in=ids)
            student_ids = list(student_set.values_list('student__id', flat=True).distinct())
            week_ids = list(student_set.values_list('academic_term__week__id', flat=True).distinct())

            student_set_name = ",".join(student_set.values_list("name", flat=True))

            TtStudentSet.objects.filter(id__in=ids).delete()

            # remove from redis
            redis_student_set_table = "student_set"
            redis_student_table = "student"
            redis_data = {
                "update": {},
                "delete": {}
            }
            if student_ids and week_ids:
                redis_data = helper_recalculate_and_get_redis_resource_map(
                    redis_data=redis_data,
                    student_ids=list(student_ids),
                    week_ids=list(week_ids),
                    slot_per_week=slot_per_week,
                )
            # update redis student table student_set_ids column
            if student_ids:
                students = TtStudent.objects.filter(id__in=list(student_ids)).prefetch_related("student_set")
                for student in students:
                    student_set_ids = list({ss.id for ss in student.student_set.all()})
                    redis_data["update"].setdefault(redis_student_table, []).append({"id":student.id,"student_set_ids": student_set_ids,})

            # delete student_set from redis
            for id in ids:
                redis_data["delete"].setdefault(redis_student_set_table, []).append(id)

            bulk_sync_to_redis(redis_client,redis_data)

            #kafka
            method = "student_set_delete"
            kafka_topic = self.kafka_config['MICROSERVICES_TT_TOPIC']
            if kafka_topic:
                kafka_request_data = {
                    "session_id": request.user.name,
                    "student_set_ids": ids
                }
                send_request(kafka_topic, kafka_request_data, None, method)

            audit_trail = AuditTrail.objects.create(
                user_id=request.user.id,
                type=self.audit_type,
                ip_address=get_ip(request)
            )
            remark_param = {
                "name": student_set_name
            }

            # call to a function for insert details, so in future if want change to used worker, can modify in function only
            AuditTrailDetails.custom_insert(
                audit_trail=audit_trail,
                action=action,
                remark_param=remark_param,
            )
            response = {

            }

            return self.api_response(data=response)
        except ValidationError as e:
            first_message = e.detail['error']
            errors = e.detail['errors']
            return self.api_response(error=first_message,errors=errors,code=status.HTTP_400_BAD_REQUEST)
        except Exception as e:
            e_details = get_exception_detail(e)
            log_critical_error(user_id=None,descr=e_details['descr'],url=e_details['url'],trace=e_details['trace'])
            return self.api_response(error=__("message.internal_server_error"),code=status.HTTP_500_INTERNAL_SERVER_ERROR)