from typing import Protocol

from app.extensions import db


THEMES = {"auto", "light", "dark"}
NOTIFICATION_FREQUENCIES = {"quiet", "moderate", "alert"}


class SettingsUser(Protocol):
    theme: str
    dyslexia_font: bool
    completion_chime: bool
    notification_frequency: str


def update_preferences(
    user: SettingsUser,
    *,
    theme: str,
    dyslexia_font: bool,
    completion_chime: bool,
    notification_frequency: str,
) -> None:
    if theme not in THEMES:
        raise ValueError("Unknown theme.")
    if notification_frequency not in NOTIFICATION_FREQUENCIES:
        raise ValueError("Unknown notification frequency.")
    if not isinstance(dyslexia_font, bool) or not isinstance(
        completion_chime, bool
    ):
        raise ValueError("Accessibility preferences must be true or false.")

    user.theme = theme
    user.dyslexia_font = dyslexia_font
    user.completion_chime = completion_chime
    user.notification_frequency = notification_frequency
    db.session.commit()