"""Manage only this helper's per-user browser registrations."""
from pathlib import Path
from host.common import HOST_NAME


def unregister(root: Path):
    import winreg
    expected = str((root / ".runtime" / "native-host.json").resolve()).casefold()
    removed = 0
    for browser in (r"Google\Chrome", r"Microsoft\Edge", "Chromium"):
        key = rf"Software\{browser}\NativeMessagingHosts\{HOST_NAME}"
        try:
            with winreg.OpenKey(winreg.HKEY_CURRENT_USER, key) as handle:
                current = winreg.QueryValueEx(handle, "")[0]
            if isinstance(current, str) and str(Path(current).resolve()).casefold() == expected:
                winreg.DeleteKey(winreg.HKEY_CURRENT_USER, key)
                removed += 1
        except FileNotFoundError:
            continue
    return {"removed": True, "registrations": removed}