from snek.system.form import Form, FormButtonElement, FormInputElement, HTMLElement


class AuthField(FormInputElement):

    @property
    async def errors(self):
        result = await super().errors
        if self.model.password.value and self.model.username.value:
            if not await self.app.services.user.validate_login(
                self.model.username.value, self.model.password.value
            ):
                return ["Invalid username or password"]
        return result


class LoginForm(Form):

    title = HTMLElement(tag="h1", text="Login")

    username = AuthField(
        name="username",
        required=True,
        min_length=2,
        max_length=20,
        regex=r"^[a-zA-Z0-9_]+$",
        place_holder="Username",
        type="text",
    )
    password = AuthField(
        name="password",
        required=True,
        regex=r"^[a-zA-Z0-9_.+-]{6,}",
        type="password",
        place_holder="Password",
    )

    action = FormButtonElement(
        name="action", value="submit", text="Login", type="button"
    )

    @property
    async def is_valid(self):
        return all(
            [
                self["username"],
                self["password"],
                not await self.username.errors,
                not await self.password.errors,
            ]
        )