"""Read-only status history for restart-safe background jobs."""
from __future__ import annotations

import time

from fastapi import APIRouter, HTTPException
from fastapi.responses import FileResponse

from core.database import background_job_artifact_path, background_job_get, background_job_list

router = APIRouter()


def _public_job(job: dict) -> dict:
    payload = dict(job)
    payload.pop("fingerprint", None)
    payload.pop("created", None)
    payload.pop("updated", None)
    result = payload.get("result")
    if isinstance(result, dict):
        result = dict(result)
        if isinstance(result.get("artifact"), dict) and result["artifact"].get("name"):
            result["artifact"] = {**result["artifact"], "url": f"/api/jobs/{job.get('job_id')}/artifacts/{result['artifact']['name']}"}
        if isinstance(result.get("artifacts"), list):
            result["artifacts"] = [
                {**item, "url": f"/api/jobs/{job.get('job_id')}/artifacts/{item['name']}"}
                if isinstance(item, dict) and item.get("name") else item
                for item in result["artifacts"]
            ]
        payload["result"] = result
    payload["elapsed"] = round(time.time() - float(job.get("created") or time.time()), 1)
    return payload


@router.get("/api/jobs")
async def jobs_list(kind: str = "", limit: int = 50):
    return {"jobs": [_public_job(job) for job in background_job_list(kind, limit) if job]}


@router.get("/api/jobs/{job_id}")
async def jobs_get(job_id: str):
    job = background_job_get(job_id)
    if job is None:
        raise HTTPException(404, "Unknown or expired job")
    return _public_job(job)


@router.get("/api/jobs/{job_id}/artifacts/{name}")
async def jobs_artifact(job_id: str, name: str):
    path = background_job_artifact_path(job_id, name)
    if path is None:
        raise HTTPException(404, "Unknown or expired job artifact")
    media_type = "application/octet-stream"
    suffix = path.suffix.lower()
    if suffix == ".wav": media_type = "audio/wav"
    elif suffix == ".mp3": media_type = "audio/mpeg"
    elif suffix == ".png": media_type = "image/png"
    elif suffix in {".jpg", ".jpeg"}: media_type = "image/jpeg"
    return FileResponse(path, media_type=media_type, headers={"Cache-Control": "private, no-store"})