import jdatetime
from rest_framework.pagination import PageNumberPagination
from django.db.models import Q


class CustomPagination(PageNumberPagination):
    page_size = 10
    page_size_query_param = 'page_size'
    max_page_size = 100


def convert_to_miladi(year=None, month=None, day=None):
    date = jdatetime.datetime(year, month, day).togregorian()
    return date


def build_query(fields, value):
    query = Q()
    for field in fields:
        query |= Q(**{f"{field}__icontains": value})
    return query


def build_calculation(queryset, column_name, aggregate_func):
    result = queryset.aggregate(total=aggregate_func(column_name))
    return result['total'] or 0