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

from .error import VMError

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

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


VM_KEY = "VB:Voicemeeter {17359A74-1236-5467}"
REG_KEY = "\\".join(
    filter(
        None,
        (
            "SOFTWARE",
            "WOW6432Node" if BITS == 64 else "",
            "Microsoft",
            "Windows",
            "CurrentVersion",
            "Uninstall",
        ),
    )
)


def get_vmpath():
    with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"{}".format("\\".join((REG_KEY, VM_KEY)))) as vm_key:
        return winreg.QueryValueEx(vm_key, r"UninstallString")[0]


try:
    vm_parent = Path(get_vmpath()).parent
except FileNotFoundError as e:
    raise VMError("Unable to fetch DLL path from the registry") from e

DLL_NAME = f'VoicemeeterRemote{"64" if BITS == 64 else ""}.dll'

dll_path = vm_parent.joinpath(DLL_NAME)
if not dll_path.is_file():
    raise VMError(f"Could not find {dll_path}")

if BITS == 64:
    libc = ct.CDLL(str(dll_path))
else:
    libc = ct.WinDLL(str(dll_path))