"""In-memory models representing conversion workflow state."""

from __future__ import annotations

from dataclasses import dataclass, field
from datetime import datetime, timezone
from pathlib import Path
from typing import Any

def utc_now() -> datetime:
    """Return the current UTC timestamp with timezone information."""
    return datetime.now(tz=timezone.utc)


@dataclass(slots=True)
class ConversionSession:
    """Stores mutable state for a single conversion lifecycle."""

    conversion_id: str
    source_filename: str
    bucket_name: str
    upload_object_key: str
    status: int
    created_at: datetime = field(default_factory=utc_now)
    updated_at: datetime = field(default_factory=utc_now)
    error_message: str = ""
    slide_deck: Any | None = None
    work_dir: Path | None = None
    conversion_task: Any | None = None
    cleanup_task: Any | None = None