"""Hello World: the first script to run after installing the SDK.

Confirms your Barbara API Credentials are set up correctly, then says
hello to your company's fleet: one call to authenticate, one call to list
its nodes. Nothing else — if this doesn't work, nothing built on top of
the SDK will either.

Credentials are read from environment variables (BBR_API_CLIENT_ID /
BBR_API_CLIENT_SECRET / BBR_API_USERNAME / BBR_API_PASSWORD), optionally
loaded from a .env file first — see load_dotenv() below and README.md.
"""

from __future__ import annotations

import argparse
import os

from barbara import BarbaraAuthError, BarbaraClient


def load_dotenv(path: str) -> None:
    """Minimal .env loader (no extra dependency). Variables already set in
    the environment always take precedence over the file.
    """
    if not os.path.isfile(path):
        return
    with open(path, encoding="utf-8") as fh:
        for line in fh:
            line = line.strip()
            if not line or line.startswith("#") or "=" not in line:
                continue
            key, _, value = line.partition("=")
            os.environ.setdefault(key.strip(), value.strip().strip('"').strip("'"))


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    parser.add_argument(
        "--env-file", default=".env", help="Path to a .env file with Barbara API Credentials"
    )
    args = parser.parse_args()
    load_dotenv(args.env_file)

    with BarbaraClient.from_env() as client:
        try:
            client.api_version()
        except BarbaraAuthError as exc:
            raise SystemExit(f"Login failed — check your Barbara API Credentials: {exc}")
        print("Login OK.")

        nodes = client.nodes.list()
        print(f"Hello! You have {len(nodes)} node(s) in your fleet:")
        for node in nodes:
            print(f"  - {node.node_name} ({node.id}) status={node.status}")


if __name__ == "__main__":
    main()