"""Flask Request Utils.

Utils for parsing request values.
"""

from collections import namedtuple

from account.constants import pagination

Pagination = namedtuple('Pagination', ['offset', 'limit'])


def get_pagination(request):
    """Parse pagination information.

    Args:
        request (Flask.request): The request object.

    Returns:
        Pagination (namedtuple): pagination information.
    """
    page_offset = request.args.get('page_offset') or pagination.PAGE_OFFSET_DEFAULT
    page_offset = _get_int(page_offset, pagination.PAGE_OFFSET_DEFAULT)

    page_limit = request.args.get('page_limit') or pagination.PAGE_LIMIT_DEFAULT
    page_limit = _get_int(page_limit, pagination.PAGE_LIMIT_DEFAULT)

    return Pagination(page_offset, page_limit)


def _get_int(value, default_value):
    """Helper method to convert a value to int.

    Args:
        value (str or int): The value to convert to int.
        default_value (int): The default value to use if value cannot be
            converted.

    Returns:
        int: value converted to int.
    """
    try:
        return int(value)
    except:
        return default_value