"""Shared progress state — polled by UI timer during long translation."""

from __future__ import annotations

import threading
from dataclasses import dataclass


@dataclass
class ProgressState:
    pct: float = 0.0
    message: str = "Sẵn sàng."
    running: bool = False


_lock = threading.Lock()
_state = ProgressState()


def set_progress(pct: float, message: str, *, running: bool = True) -> None:
    with _lock:
        _state.pct = max(0.0, min(100.0, float(pct)))
        _state.message = message
        _state.running = running


def finish_progress(message: str) -> None:
    with _lock:
        _state.pct = 100.0
        _state.message = message
        _state.running = False


def reset_progress(message: str = "Sẵn sàng.") -> None:
    with _lock:
        _state.pct = 0.0
        _state.message = message
        _state.running = False


def snapshot() -> ProgressState:
    with _lock:
        return ProgressState(
            pct=_state.pct,
            message=_state.message,
            running=_state.running,
        )