"""Shared workspace paths and text normalization."""
import os
import sys
import unicodedata
from pathlib import Path

_BUNDLE = getattr(sys, '_whatsapp_bundle', None)
BASE = Path(_BUNDLE['base']) if _BUNDLE else Path(__file__).resolve().parent.parent
ASSETS = Path(__file__).resolve().parent / "assets"
PROFILE = Path(os.environ.get("LOCALAPPDATA", str(Path.home() / "AppData/Local"))) / "Packages/5319275A.WhatsAppDesktop_cv1g1gvanyjgm/LocalCache/EBWebView/Default"

def normalized(value):
    return unicodedata.normalize('NFC', value).casefold()


def resource_bytes(name):
    """Read an embedded bundle resource or its development-tree equivalent."""
    if _BUNDLE:
        return _BUNDLE['read'](name)
    return (BASE / name).read_bytes()


def asset_bytes(name):
    return resource_bytes('whatsapp_suite/assets/' + name)


def cli_command(*arguments):
    if _BUNDLE:
        return [sys.executable, str(_BUNDLE['launcher']), *arguments]
    return [sys.executable, '-m', 'whatsapp_suite', *arguments]


def verified_helper(asset, digest, cache_dir, filename):
    """Materialize a hash-verified DLL only when a live probe needs it."""
    import ctypes
    import hashlib
    import tempfile
    if os.name != 'nt' or ctypes.sizeof(ctypes.c_void_p) != 8:
        raise ValueError('Native helpers require Windows and 64-bit Python')
    payload = asset_bytes(asset)
    if hashlib.sha256(payload).hexdigest() != digest:
        raise ValueError('Bundled helper failed SHA-256 verification')
    folder = BASE / cache_dir / digest
    folder.mkdir(parents=True, exist_ok=True)
    dll = folder / filename
    existed = dll.exists()
    if existed and hashlib.sha256(dll.read_bytes()).hexdigest() == digest:
        return dll, 'reused'
    descriptor, temporary = tempfile.mkstemp(prefix='helper-', suffix='.tmp', dir=folder)
    try:
        with os.fdopen(descriptor, 'wb') as stream:
            stream.write(payload)
        os.replace(temporary, dll)
    finally:
        Path(temporary).unlink(missing_ok=True)
    return dll, 'repaired' if existed else 'extracted'