"""엔진이 UI로 올려보내는 이벤트 타입."""

from __future__ import annotations

import time
from dataclasses import dataclass, field
from enum import Enum


class EngineState(str, Enum):
    IDLE = "idle"
    LOADING = "loading"
    RUNNING = "running"
    STOPPING = "stopping"
    ERROR = "error"


@dataclass
class TranslationLine:
    """화면에 뿌릴 자막 한 줄."""

    source_text: str
    translated_text: str
    source_lang: str
    target_lang: str
    is_final: bool = True
    created_at: float = field(default_factory=time.time)
    #: 발화가 끝난 시점부터 번역이 나오기까지 걸린 시간(초)
    latency_s: float = 0.0
    asr_ms: int = 0
    mt_ms: int = 0

    @property
    def display(self) -> str:
        return self.translated_text or self.source_text


@dataclass
class EngineStatus:
    state: EngineState = EngineState.IDLE
    message: str = ""
    progress: float = 0.0
    #: 최근 입력 오디오 레벨 (0.0 ~ 1.0), VU 미터용
    level: float = 0.0
    queue_depth: int = 0