"""Validators for request query parameters."""

from oto import response as oto_response
from oto import status as oto_status

from availability.constants import error
from availability.constants import stores


def validate_product_ids_parameter(query_params):
    """Validate products_id query parameter, should be list of ints.

    Function is intended to usage for GET /status endpoint.

    Args:
        query_params (ImmutableMultiDict): dict with supplied params.

    Returns:
        oto.response.Response: .message with list of product ids on success,
            .errors on failure.
    """
    if not len(query_params) == 1 or not query_params.get('product_ids'):
        return oto_response.create_error_response(
            code=error.ERROR_CODE_QUERY_PARAM,
            message=error.ERROR_INVALID_QUERY_PARAM)
    try:
        product_ids = [int(i) for i in query_params['product_ids'].split(',')]
    except ValueError:  # means we've got not integer product ids
        return oto_response.create_error_response(
            code=error.ERROR_CODE_QUERY_PARAM,
            message=error.ERROR_INVALID_QUERY_PARAM)
    return oto_response.Response(product_ids)


def validate_store_id(store_id):
    """Check whether store with provided id exists.

    Args:
        store_id (int): PK of particular store.

    Returns:
        oto.response.Response: .status == 204 on success, .errors on failure.
    """
    try:
        store_id = int(store_id)
    except (TypeError, ValueError):
        return oto_response.create_not_found_response(
            error.ERROR_MESSAGE_STORE_NOT_FOUND)
    if store_id not in stores.STORE_IDS:
        return oto_response.create_not_found_response(
            error.ERROR_MESSAGE_STORE_NOT_FOUND)
    return oto_response.Response(status=oto_status.OK, message=store_id)