"""Shared upload-path helper (Chapter 04) — used by the uploads blueprint,
the optional CLI processor, and the automatic background-thread processor,
so there's one definition of where a given LogFile's raw upload lives on
disk. Pulled out of the uploads blueprint so services/ doesn't have to
import from blueprints/ (the wrong direction) to reach it.
"""
from __future__ import annotations

from pathlib import Path

from flask import current_app

from app.models.log_file import LogFile


def upload_path_for(log_file: LogFile) -> Path:
    """Deterministic on-disk path for a LogFile row — avoids a new DB column."""
    ext = Path(log_file.filename).suffix.lower()
    upload_dir = Path(current_app.config["UPLOAD_DIR"])
    return upload_dir / f"{log_file.id}{ext}"