"""DLQ payload serializers for Taskiq dead-letter entries.

Pure module: no FastAPI imports.
"""

from __future__ import annotations

import os
import socket
import sys
import traceback
from datetime import datetime, timezone

from taskiq.message import TaskiqMessage

from taskiq_management.models import APP_VERSION


def serialize_dlq_payload(
    message:TaskiqMessage,
    exception:BaseException,
    *,
    retries:int,
    queue:str|None=None,
) -> dict:
    now=datetime.now(timezone.utc).isoformat()
    return {
        "task_name":message.task_name,
        "task_id":message.task_id,
        "kwargs":message.kwargs or {},
        "args":list(message.args or []),
        "exception":type(exception).__name__,
        "message":str(exception),
        "traceback":"".join(traceback.format_exception(type(exception),exception,exception.__traceback__)),
        "retry_count":retries,
        "worker":os.getenv("TASKIQ_WORKER_NAME") or os.getenv("HOSTNAME") or socket.gethostname(),
        "queue":message.labels.get("queue") or queue or "taskiq",
        "created_at":message.labels.get("created_at") or now,
        "failed_at":now,
        "correlation_id":message.labels.get("correlation_id") or message.task_id,
        "hostname":socket.gethostname(),
        "python_version":sys.version.split()[0],
        "app_version":APP_VERSION,
    }