"""Register / unregister AR Display Manager as a Windows autostart entry."""
from __future__ import annotations

import sys
from pathlib import Path

_REG_KEY = r"Software\Microsoft\Windows\CurrentVersion\Run"
_APP_NAME = "AR Display Manager"


def _pythonw() -> str:
    """Return the pythonw.exe path (no console window on start)."""
    exe = Path(sys.executable)
    pw = exe.parent / "pythonw.exe"
    return str(pw) if pw.exists() else sys.executable


def enable() -> bool:
    """Add the autostart registry entry. Returns True on success."""
    if sys.platform != "win32":
        return False
    try:
        import winreg  # type: ignore[import-not-found]
        launcher = Path(__file__).resolve().parents[1] / "display_manager_main.py"
        cmd = f'"{_pythonw()}" "{launcher}"'
        with winreg.OpenKey(
            winreg.HKEY_CURRENT_USER, _REG_KEY, 0, winreg.KEY_SET_VALUE
        ) as key:
            winreg.SetValueEx(key, _APP_NAME, 0, winreg.REG_SZ, cmd)
        return True
    except Exception:
        return False


def disable() -> bool:
    """Remove the autostart registry entry. Returns True if it existed."""
    if sys.platform != "win32":
        return False
    try:
        import winreg  # type: ignore[import-not-found]
        with winreg.OpenKey(
            winreg.HKEY_CURRENT_USER, _REG_KEY, 0, winreg.KEY_SET_VALUE
        ) as key:
            winreg.DeleteValue(key, _APP_NAME)
        return True
    except FileNotFoundError:
        return False
    except Exception:
        return False


def is_enabled() -> bool:
    """Return True if the autostart entry exists."""
    if sys.platform != "win32":
        return False
    try:
        import winreg  # type: ignore[import-not-found]
        with winreg.OpenKey(
            winreg.HKEY_CURRENT_USER, _REG_KEY, 0, winreg.KEY_READ
        ) as key:
            winreg.QueryValueEx(key, _APP_NAME)
        return True
    except FileNotFoundError:
        return False
    except Exception:
        return False