#!/usr/bin/env python3
# -*- mode: python -*-
#
# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license

"""
Simulate the low-frequency radio foregrounds for the 21cm EoR signal.
"""

import os
import sys
import argparse
import logging

from fg21sim import Foregrounds
from fg21sim.configs import configs, validate_configs
from fg21sim.utils import setup_logging


def main():
    parser = argparse.ArgumentParser(
        description="Simulate the radio foregrounds for 21cm EoR signal")
    parser.add_argument("config", help="user configuration file")
    parser.add_argument("-l", "--log", dest="loglevel", default=None,
                        choices=["DEBUG", "INFO", "WARNING",
                                 "ERROR", "CRITICAL"],
                        help="set the log level")
    parser.add_argument("-L", "--logfile", default=None,
                        help="filename where to save the log messages")
    parser.add_argument("-Q", "--quiet", action="store_true",
                        help="be quiet so do not log messages to screen")
    args = parser.parse_args()

    configs.read_userconfig(args.config)
    if os.environ.get("DEBUG_FG21SIM"):
        print("DEBUG: Current configurations:", configs._config,
              sep="\n", file=sys.stderr)
    validate_configs(configs)

    if args.quiet:
        log_stream = ""
    else:
        log_stream = None

    setup_logging(dict_config=configs.logging,
                  level=args.loglevel,
                  stream=log_stream,
                  logfile=args.logfile)
    tool = os.path.basename(sys.argv[0])
    logger = logging.getLogger(tool)
    logger.info("COMMAND: {0}".format(" ".join(sys.argv)))

    fg = Foregrounds(configs)
    fg.preprocess()
    fg.simulate()
    fg.postprocess()


if __name__ == "__main__":
    main()