from __future__ import annotations

import os
import tomllib
from pathlib import Path


def config_path() -> Path:
    return Path(os.environ.get("TAMQ_CONFIG", Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config")) / "tamq" / "config.toml"))


def _setting(name: str) -> str | None:
    path = config_path()
    if not path.exists():
        return None
    try:
        with path.open("rb") as stream:
            value = tomllib.load(stream).get("tamq", {}).get(name)
            return value if isinstance(value, str) else None
    except (OSError, tomllib.TOMLDecodeError):
        return None


def setting(name: str, default: str) -> str:
    """Read a scalar [tamq] setting, falling back to a stable default."""
    return _setting(name) or default


def state_dir() -> Path:
    return Path(os.environ.get("TAMQ_STATE_DIR", _setting("state_dir") or Path(os.environ.get("XDG_STATE_HOME", Path.home() / ".local" / "state")) / "tamq"))


def db_path() -> Path:
    return state_dir() / "tamq.sqlite3"


def socket_path() -> Path:
    return Path(os.environ.get("TAMQ_SOCKET", _setting("socket") or Path(os.environ.get("XDG_RUNTIME_DIR", "/tmp")) / "tamq.sock"))


def pid_path() -> Path:
    return Path(os.environ.get("TAMQ_PIDFILE", _setting("pidfile") or Path(os.environ.get("XDG_RUNTIME_DIR", "/tmp")) / "tamq.pid"))


def lock_path() -> Path:
    return Path(os.environ.get("TAMQ_LOCKFILE", _setting("lockfile") or Path(os.environ.get("XDG_RUNTIME_DIR", "/tmp")) / "tamq.lock"))