"""Locate the official SimpleX binaries — never built/modified here, only invoked.

Resolution order: $SIMPLEX_BIN dir, then ./bin/, then PATH. Place prebuilt
binaries (simplex-chat, simplex-directory-service, simplex-broadcast-bot) in ./bin/
or install via the upstream install script. We never compile or alter them.
"""

import os
import shutil
from pathlib import Path

BIN_DIR = Path(os.environ.get("SIMPLEX_BIN", Path(__file__).resolve().parent.parent / "bin"))

KNOWN = ("simplex-chat", "simplex-directory-service", "simplex-broadcast-bot")


def binary_path(name: str) -> str:
    local = BIN_DIR / name
    if local.exists():
        return str(local)
    found = shutil.which(name)
    if found:
        return found
    raise FileNotFoundError(f"{name!r} not found in {BIN_DIR} or PATH")