"""
byceps.util.forms
~~~~~~~~~~~~~~~~~

:Copyright: 2014-2025 Jochen Kupperschmidt
:License: Revised BSD (see `LICENSE` file for details)
"""

from flask_babel import lazy_gettext
from wtforms import Field, SelectMultipleField
from wtforms.widgets import CheckboxInput, ListWidget, TextInput

from byceps.services.user import user_service
from byceps.services.user.models.user import User


class MultiCheckboxField(SelectMultipleField):
    widget = ListWidget(prefix_label=False)
    option_widget = CheckboxInput()

    class _Option(SelectMultipleField._Option):
        def __init__(self, *args, **kwargs) -> None:
            # Do not pass validators to checkbox sub-widgets to prevent
            # them from always having the `required` flag set.
            kwargs.pop('validators', None)
            super().__init__(*args, **kwargs)


class UserScreenNameField(Field):
    """A field which takes a user screen name and stores the
    corresponding user object.
    """

    widget = TextInput()

    def __init__(self, label=None, validators=None, **kwargs) -> None:
        super().__init__(label, validators, **kwargs)

    def _value(self) -> str:
        if self.raw_data:
            return self.raw_data[0]

        if self.data is not None:
            # As user was found via screen name, the user object's
            # screen name cannot be empty.
            return self.data.screen_name  # type: ignore

        return ''

    def process_data(self, value) -> None:
        if value is None:
            self.data = None
            return

        screen_name = value.strip()
        user = _find_user_by_screen_name(screen_name)
        if user is None:
            self.data = None
            raise ValueError(lazy_gettext('Unknown username'))

        self.data = user

    def process_formdata(self, valuelist) -> None:
        if not valuelist:
            return

        screen_name = valuelist[0].strip()
        user = _find_user_by_screen_name(screen_name)
        if user is None:
            self.data = None
            raise ValueError(lazy_gettext('Unknown username'))

        self.data = user


def _find_user_by_screen_name(screen_name: str) -> User | None:
    return user_service.find_user_by_screen_name(screen_name)