"""Launch-on-login via a freedesktop autostart entry.

Writes ~/.config/autostart/blitztext.desktop so the tray starts with the GNOME
session. No root needed.
"""

from __future__ import annotations

import os
import shutil
import sys
from pathlib import Path

_AUTOSTART_DIR = Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config")) / "autostart"
_ENTRY = _AUTOSTART_DIR / "blitztext.desktop"


def _exec_command() -> str:
    """Prefer an installed `blitztext` launcher; else run this venv's module."""
    launcher = shutil.which("blitztext")
    if launcher:
        return f"{launcher} tray"
    return f"{sys.executable} -m blitztext tray"


def is_enabled() -> bool:
    return _ENTRY.exists()


def set_enabled(enabled: bool) -> None:
    if not enabled:
        _ENTRY.unlink(missing_ok=True)
        return
    _AUTOSTART_DIR.mkdir(parents=True, exist_ok=True)
    _ENTRY.write_text(
        "[Desktop Entry]\n"
        "Type=Application\n"
        "Name=Blitztext\n"
        f"Exec={_exec_command()}\n"
        "Icon=blitztext\n"
        "Terminal=false\n"
        "X-GNOME-Autostart-enabled=true\n",
        encoding="utf-8",
    )