from typing import Optional as tOptional

from flask_babel import lazy_gettext
from flask_wtf import FlaskForm
from wtforms import (
    BooleanField,
    DateField,
    Field,
    RadioField,
    StringField,
    SubmitField,
    ValidationError,
)
from wtforms.validators import Email, InputRequired, Length, Optional


class NotEqualTo:
    """
    Compares the values of two fields.
    :param fieldname:
        The name of the other field to compare to.
    :param message:
        Error message to raise in case of a validation error. Can be
        interpolated with `%(other_label)s` and `%(other_name)s` to provide a
        more helpful error.
    """

    def __init__(self, fieldname: str, message: tOptional[str] = None) -> None:
        self.fieldname = fieldname
        self.message = message

    def __call__(self, form: FlaskForm, field: Field) -> None:
        try:
            other = form[self.fieldname]
        except KeyError as exc:
            raise ValidationError(
                field.gettext("Invalid field name '%s'.") % self.fieldname
            ) from exc
        if field.data != other.data:
            return

        d = {
            "other_label": hasattr(other, "label")
            and other.label.text
            or self.fieldname,
            "other_name": self.fieldname,
        }
        message = self.message
        if message is None:
            message = field.gettext("Field must not be equal to %(other_name)s.")

        raise ValidationError(message % d)


class MembershipForm(FlaskForm):

    username = StringField(
        lazy_gettext("Username"),
        validators=[
            InputRequired(lazy_gettext("This field is required!")),
            Length(max=255),
        ],
    )

    email = StringField(
        lazy_gettext("E-Mail"),
        validators=[InputRequired(lazy_gettext("This field is required!")), Email()],
    )

    fullname = StringField(
        lazy_gettext("Full Name"),
        validators=[
            InputRequired(lazy_gettext("This field is required!")),
            Length(max=65536),
        ],
    )

    membership = RadioField(
        lazy_gettext("Membership Plan"),
        validators=[InputRequired(lazy_gettext("Please select one of the options!"))],
        choices=[
            (
                "regular",
                lazy_gettext(
                    "Regular membership - Membership with voting rights on the general assembly."
                ),
            ),
            (
                "supporting",
                lazy_gettext(
                    "Supporting membership - Membership without voting rights on the general assembly."
                ),
            ),
        ],
    )

    student = BooleanField(
        lazy_gettext(
            "I am a student and would like to have the reduced membership fees."
        ),
        validators=[
            Optional(),
            NotEqualTo(
                "starving",
                lazy_gettext(
                    "Student and Starving Hacker are mutually exclusive! Please select only one of them."
                ),
            ),
        ],
    )

    starving = BooleanField(
        lazy_gettext(
            "I am a starving hacker and cannot afford the membership! (Please get in touch with us at info@c3l.lu before filling out this membership form)"
        )
    )

    payment = RadioField(
        lazy_gettext("Payment Options"),
        validators=[InputRequired(lazy_gettext("Please select one of the options!"))],
    )

    birthday = DateField(lazy_gettext("Birthday"), validators=[InputRequired()])

    street = StringField(
        lazy_gettext("Nr., Street"),
        validators=[Optional(), Length(max=4000)],
    )

    postal = StringField(
        lazy_gettext("Postal Code"),
        validators=[Optional(), Length(max=30)],
    )

    city = StringField(
        lazy_gettext("City/Town"),
        validators=[Optional(), Length(max=500)],
    )

    state = StringField(
        lazy_gettext("State/County/Province"),
        validators=[Optional(), Length(max=500)],
    )

    country = StringField(
        lazy_gettext("Country"),
        validators=[Optional(), Length(max=500)],
    )

    terms = BooleanField(
        lazy_gettext(
            'By submitting this membership application, you agree to have read and understood the <a href="http://statutes.c3l.lu">statutes of the Chaos Computer Club Lëtzebuerg A.S.B.L.</a>.'
        ),
        validators=[InputRequired()],
    )

    submit = SubmitField(lazy_gettext("Become a member"))