#!/usr/bin/python3 -d

# Copyright (c) 2020 Johannes Findeisen <you@hanez.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is furnished
# to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import argparse
import json
# import logging
# import logging.handlers
import sys
import time

from uplink.uplink import Uplink

# Version format: MAJOR.FEATURE.FIXES
__version__ = "0.4.0-development"

# TODO: CHECK ALL ERROR HANDLING!!!
# TODO: Implement logging
# TODO: Implement CLI output messages
# TODO: IDEA: Implement a small webserver inline to get statistics and graphs over the network? Or maybe better as a
#  separate daemon
# TODO: Make use of more args passed to the script
# TODO: Implement a speedtest that will also run regularly but in an individual interval


def parse_args():
    parser = argparse.ArgumentParser(
        description="uplink is a tool to monitor the link status of AVM FRITZ!Box Cable and DSL based routers.",
        epilog="uplink is not some program expecting uplinks to work!",
        prog="uplink")

    parser.add_argument("config", metavar="CONFIGFILE", help="the configfile to use")

    mode = parser.add_mutually_exclusive_group()
    mode.add_argument("-c", "--cron", default=False, dest="cron", action="store_true",
                      help="cron mode executes the script only once without loop (default: false)")

    mode.add_argument("-d", "--daemon", default=False, dest="daemon", action="store_true",
                      help="run as native daemon (default: false)")

    mode.add_argument("-f", "--foreground", default=False, dest="foreground", action="store_true",
                      help="run looped in foreground (default: false)")

    parser.add_argument("-i", "--interval", type=int, help="poll interval in seconds. this overrides config file "
                                                           "settings. (default: 60)")

    """
    parser.add_argument("-b", "--database", metavar="DATABASE", help="database to use")

    parser.add_argument("-u", "--user", type=str, help="database username")

    parser.add_argument("-p", "--password", type=str, help="database password")

    parser.add_argument("-l", "--logfile", metavar="FILE", help="logfile to use")

    parser.add_argument("-c", "--log-count", default=5, type=int,
                        help="maximum number of logfiles in rotation (default: 5)")

    parser.add_argument("-m", "--log-size", default=10485760, type=int,
                        help="maximum logfile size in bytes (default: 10485760)")

    parser.add_argument("-s", "--stdout", default=False, dest="stdout", action="store_true", help="log to stdout")

    output = parser.add_mutually_exclusive_group()
    output.add_argument("-q", "--quiet", action="store_const", dest="log_level", const=logging.ERROR,
                        help="output only errors")

    output.add_argument("-w", "--warning", action="store_const", dest="log_level", const=logging.WARNING,
                        help="output warnings")

    output.add_argument("-v", "--verbose", action="store_const", dest="log_level", const=logging.INFO,
                        help="output info messages")

    output.add_argument("-d", "--debug", action="store_const", dest="log_level", const=logging.DEBUG,
                        help="output debug messages")
    output.set_defaults(loglevel=logging.ERROR)
    """

    parser.add_argument("--version", action="version", version="%(prog)s " + str(__version__))

    return parser.parse_args()


if __name__ == "__main__":
    args = parse_args()

    # TODO: Read --version argument and print program version; then exit.

    # TODO: Cleanup config.json and only define what really is needed
    config_path = args.config
    try:
        with open(config_path, 'r') as configfile:
            config_data = configfile.read()
        _config = json.loads(config_data)
    except "OSError, PermissionDenied, RuntimeError, ValueError" as err:
        # TODO: Replace all lines like this with generic Python logging
        print(str("Uplink: Configuration Error!" + err))
        sys.exit(1)

    try:
        _config["interval"]
    except KeyError:
        # interval not configured in configuration; using default value
        _config["interval"] = 60

    if args.interval:
        # interval set in args is overriding configuration and default
        _config["interval"] = args.interval

    uplink = Uplink("/tmp/uplink.pid", _config)

    if args.cron:
        for i in range(len(_config["uplinks"])):
            uplink.get_data(_config, i)
    elif args.daemon:
        uplink.start()
    elif args.foreground:
        while True:
            for i in range(len(_config["uplinks"])):
                uplink.get_data(_config, i)
                # TODO: print data formatted to STDOUT
            time.sleep(_config["interval"])
    else:

        print("uplink: error: no run mode selected; use --cron (-c), --daemon (-d) or --foreground (-f) to run uplink. "
              "use --help for more information")