import gradio as gr
from utils.logger import Logger
from utils.database import get_db
from data.repository.annotator_repo import AnnotatorRepo
from utils.security import verify_password

log = Logger()


class AuthService:
    """
    Authenticate users against DB and drive Gradio UI states.
    """

    # --------------- LOGIN --------------- #
    @staticmethod
    def login(username: str, password: str, session: dict):
        log.info(f"Login attempt: username={username}")

        with get_db() as db:
            repo = AnnotatorRepo(db)
            user = repo.get_user_by_username(username)

            if user is None or not user.is_active:
                log.warning(
                    f"Failed login for username='{username}' (not found / inactive)."
                )
                return (
                    "❌ Wrong username or password!",
                    gr.update(),
                    gr.update(visible=False),
                    gr.update(value=""),
                )

            if not verify_password(password, user.password):
                log.warning(f"Failed login; bad password for '{username}'.")
                return (
                    "❌ Wrong username or password!",
                    gr.update(),
                    gr.update(visible=False),
                    gr.update(value=""),
                )

            session["user_id"] = user.id
            session["username"] = user.name
            log.info(f"User '{username}' logged in successfully.")
            return (
                None,
                gr.update(visible=False),
                gr.update(visible=True),
                gr.update(value=f"👋 Welcome, {user.name}!"),
            )

    # --------------- LOGOUT --------------- #
    @staticmethod
    def logout(session: dict):
        username = session.get("username", "unknown")
        session.clear()
        log.info(f"User '{username}' logged out.")
        return (
            gr.update(visible=True),
            gr.update(visible=False),
            gr.update(value=""),
            gr.update(value=""),
        )