#!/usr/bin/env python3
"""Shared connection settings for the telnet drivers in this directory.

Resolved highest-priority-first from: the process environment, `../.env`,
`../example.env`, then built-in defaults. Keeps addresses and credentials out
of the scripts (and out of git) — see ../example.env.
"""
import os

KEYS = ('GPON_HOST', 'GPON_PORT', 'GPON_USER', 'GPON_PASS')
_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


def _parse(path):
    vals = {}
    try:
        with open(path) as f:
            for line in f:
                line = line.strip()
                if not line or line.startswith('#') or '=' not in line:
                    continue
                k, v = line.split('=', 1)
                vals[k.strip()] = v.strip().strip('"').strip("'")
    except OSError:
        pass
    return vals


_cfg = _parse(os.path.join(_ROOT, 'example.env'))
_cfg.update(_parse(os.path.join(_ROOT, '.env')))
_cfg.update({k: v for k, v in os.environ.items() if k in KEYS})

HOST = _cfg.get('GPON_HOST') or '192.168.100.1'
PORT = int(_cfg.get('GPON_PORT') or 23)
USER = _cfg.get('GPON_USER') or 'root'
PASS = _cfg.get('GPON_PASS') or 'admin'