"""Request helper methods."""

from flask import request
from marshmallow import ValidationError

from royalties.constants.constants import DEFAULT_PAGE_LIMIT, DEFAULT_PAGE_OFFSET
from royalties.constants.error import (
    ERROR_INVALID_LIMIT_OFFSET,
    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 ValidationError(ERROR_INVALID_LIMIT_OFFSET)

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

    return pagination_params


def get_optional_numeric_list_from_params():
    """Get data from request params and validate them."""
    optional_params = request.json
    if not optional_params:
        return
    return [int(param) for param in optional_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 ValidationError(ERROR_POST_REQUEST_DUPLICATE_RECORDS.format(record))
        else:
            list_of_unique_records.append(record)

    return True