#!/usr/bin/env python
import importlib
import importlib.util
import os
from pathlib import Path
import sys

import yaml

from rproxy.sockets import start_reverse_proxy
from rproxy.config import Config


def usage() -> str:
    example = (
        Path(importlib.util.find_spec("rproxy").origin).parent
        / "resources"
        / "example.config.yaml"
    )
    return (
        f"Reverse proxy server.\n\nusage: {prog} config\n"
        f"example: {prog} ./my-config.yaml\n\n"
        f"See example config file at {example}"
    )


try:
    with open(sys.argv[1]) as f:
        config = Config(**yaml.safe_load(f))
        print(config)
except (FileNotFoundError, IndexError) as e:
    prog = os.path.basename(sys.argv[0])
    print(
        f"Error: missing config file argument. {e}.\n{usage()}",
        file=sys.stderr,
    )
    sys.exit(1)

try:
    start_reverse_proxy(config)
except KeyboardInterrupt:
    sys.exit(0)