"""Module containing WTForms classes
and helper functions for Starlette-WTF"""

from typing import Type, TypeVar

from fastapi import Request
from starlette_wtf import StarletteForm

T = TypeVar('T', bound=StarletteForm)


async def get_form(
        form: Type[T],
        req: Request) -> T:
    """Almost the same as `form.from_formdata`,
    and must be used *instead* of instantiating
    form object directly as in Flask.
    See `respond.with_tmpl` for explanation
    about the `request` argument

    Args:
        form (Type[StarletteForm]): StarletteForm class
        req (Request): Request object

    Returns:
        StarletteForm instance
    """

    return await form.from_formdata(request=req)