"""Pagination Utils."""

from flask import request
import marshmallow

from conflict_manager import exceptions
from conflict_manager.schemas.pagination_schema import PaginationSchema


def get_pagination_options(sort_by_options=[], default_sort_by=None):
    """Get pagination options."""
    schema = PaginationSchema(
        sort_by_options=sort_by_options, default_sort_by=default_sort_by)
    try:
        return schema.load(request.args)
    except marshmallow.ValidationError as err:
        raise exceptions.ValidationError(message=err.messages)