"""长任务轮询端点 GET /jobs/:id（ARCH §7.4）。"""

from __future__ import annotations

import uuid
from typing import Annotated

from fastapi import APIRouter, Depends
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from ww_db import get_session
from ww_db.models import Job
from ww_shared import AppError, ErrorCode, ErrorEnvelope

from ww_api.schemas.jobs import JobResponse

router = APIRouter(prefix="/jobs", tags=["jobs"])


@router.get(
    "/{job_id}",
    responses={404: {"model": ErrorEnvelope, "description": "job 不存在"}},
)
async def get_job(
    job_id: uuid.UUID,
    session: Annotated[AsyncSession, Depends(get_session)],
) -> JobResponse:
    job = (await session.execute(select(Job).where(Job.id == job_id))).scalar_one_or_none()
    if job is None:
        raise AppError(ErrorCode.NOT_FOUND, f"job {job_id} not found")
    return JobResponse(
        id=job.id,
        kind=job.kind,
        status=job.status,
        progress=job.progress,
        result=job.result,
        error=job.error,
    )