"""Request helper methods."""

from ledger.constants.constants import (
    DEFAULT_PAGE_LIMIT,
    DEFAULT_PAGE_OFFSET,
    ERROR_INVALID_LIMIT_OFFSET,
)
from ledger.constants.error import ERROR_POST_REQUEST_DUPLICATE_RECORDS


def validate_pagination_params(
    limit: int = DEFAULT_PAGE_LIMIT, offset: int = DEFAULT_PAGE_OFFSET
) -> dict:
    """Format and validate pagination parameters."""
    try:
        limit = int(limit)
        offset = int(offset)
    except ValueError:
        raise Exception(ERROR_INVALID_LIMIT_OFFSET)

    pagination_params = {
        'limit': max(limit, 1),
        'offset': max(offset, DEFAULT_PAGE_OFFSET),
    }

    return pagination_params


def validate_post_request_contains_unique_data(request_body: list):
    """Validate if post request body contains unique records.

    Args:
        request_body (list): a POST request body
    """
    list_of_unique_records = list()

    for record in request_body:
        if record in list_of_unique_records:
            raise Exception(ERROR_POST_REQUEST_DUPLICATE_RECORDS.format(record))
        else:
            list_of_unique_records.append(record)

    return True