import ctypes as ct
import platform
import winreg
from pathlib import Path

from .errors import NVDAVMError

bits = 64 if ct.sizeof(ct.c_voidp) == 8 else 32

if platform.system() != "Windows":
    raise NVDAVMError("Only Windows OS supported")

REG_KEY = "\\".join(
    filter(
        None,
        (
            "SOFTWARE",
            "WOW6432Node" if bits == 64 else "",
            "Microsoft",
            "Windows",
            "CurrentVersion",
            "Uninstall",
            "NVDA",
        ),
    )
)


def get_nvdapath():
    with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"{}".format(REG_KEY)) as nvda_key:
        return winreg.QueryValueEx(nvda_key, r"UninstallDirectory")[0]


try:
    NVDA_PATH = Path(get_nvdapath()) / "nvda.exe"
except FileNotFoundError as e:
    NVDA_PATH = ""


controller_path = Path(__file__).parents[2].resolve() / "controllerClient"
if not controller_path.exists():
    controller_path = Path("controllerClient")

DLL_PATH = controller_path / f"x{64 if bits == 64 else 86}" / f"nvdaControllerClient{bits}.dll"

libc = ct.CDLL(str(DLL_PATH))