#!/usr/bin/env python3
# -*- mode: python -*-
#
# Copyright (c) 2016-2018 Weitian LI <weitian@aaronly.me>
# MIT license

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

import os
import sys
import argparse
import logging
import time

import fg21sim
from fg21sim.share import CONFIGS, COSMO
from fg21sim.utils import setup_logging

VER_INFO = "%(name)s: v%(version)s @ %(date)s" % {
    "name": fg21sim.__pkgname__,
    "version": fg21sim.__version__,
    "date": fg21sim.__date__
}


def main():
    parser = argparse.ArgumentParser(
        description="Simulate the radio foregrounds for 21cm EoR signal",
        epilog="Set environment variable 'DEBUG_FG21SIM=1' to force debug!")
    parser.add_argument("config", help="user configuration file")
    parser.add_argument("-v", "--version", action="version", version=VER_INFO)
    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()

    t1_start = time.perf_counter()
    t2_start = time.process_time()

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

    log_stream = "" if args.quiet else 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(VER_INFO)
    logger.info("COMMAND: {0}".format(" ".join(sys.argv)))

    # Save/backup current configurations
    configfile_dump = os.path.splitext(CONFIGS.userconfig)[0] + "_dump.conf"
    CONFIGS.save(configfile_dump, clobber=True, backup=True)
    logger.info("Saved current configurations to file: %s" % configfile_dump)

    # Setup cosmology model
    logger.info("Setup cosmology model with parameters from configs ...")
    COSMO.setup(**CONFIGS.cosmology)

    logger.info("Importing modules + Numba JIT, waiting ...")
    from fg21sim.foregrounds import Foregrounds
    fg = Foregrounds(CONFIGS)
    fg.preprocess()
    fg.simulate()
    fg.postprocess()

    t1_stop = time.perf_counter()
    t2_stop = time.process_time()
    logger.info("Elapsed time: %.1f [min]" % ((t1_stop-t1_start)/60))
    logger.info("CPU process time: %.1f [min]" % ((t2_stop-t2_start)/60))


if __name__ == "__main__":
    main()