#!/usr/bin/env python3
"""
                         galmonmonmon
    Monitor galmon ground station status

    Copyright (C) 2022, Jeff Moe

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""

# Usage:
# galmonmonmon --id=[Ground Station ID] --sec=[Alert max in seconds]
# Example:
# Alert if station ID 192 is down for more than 1 hour (3600 seconds).
# ./galmonmonmon --id=192 --sec=3600

import argparse
import os
import pandas as pd
from datetime import datetime

# Live URL
observer_url=('https://galmon.eu/observers.json')
# Cached file
#observer_url=('data/observers.json')

def get_observer(observer_id):
    observers = pd.read_json(observer_url, orient='records')
    for x in range(len(observers.id)):
        if observers['id'][x] == observer_id:
            observer_owner=(observers['owner'][x])
            observer_last_seen=(observers['last-seen'][x])
            return observer_owner, observer_last_seen

def get_status(observer_last_seen):
    timestamp = datetime.fromtimestamp(observer_last_seen)
    unix_time = get_unix_time()
    diff_time = ( unix_time - timestamp ).total_seconds()
    return(diff_time)

def get_unix_time():
    now = datetime.now()
    ts = now.timestamp()
    unix_time=datetime.fromtimestamp(ts)
    return unix_time

def parse_cli():
    parser = argparse.ArgumentParser(description='Monitor galmon observation ground station.')
    parser.add_argument('--id', type=int, required=True,
                         help='Galmon observation ground station ID')
    parser.add_argument('--sec', type=int, required=True,
                         help='Alert max in seconds')
    args = parser.parse_args()
    observer_id = args.id
    alert_sec = args.sec
    return observer_id, alert_sec

def show_status(observer_id, observer_owner, observer_sec, alert_sec):
    float_time=float(alert_sec)
    if observer_sec > float_time:
        observer_alert(observer_id, observer_owner, observer_sec)
    else:
        observer_ok(observer_id, observer_owner, observer_sec)

def observer_alert(observer_id, observer_owner, observer_sec):
    print('ALERT: ', end='')
    print('Station ', observer_id, ', ', observer_owner, end='', sep='')
    print(', last seen', '{:.0f}'.format(observer_sec), 'seconds ago.')
    # Put a shell command you want to run here, perhaps.
    #os.system('echo OMG down | mail -s"Galmon alert" foo@barmail')
    #os.system('/usr/local/bin/my-chat-alert-script.sh')

def observer_ok(observer_id, observer_owner, observer_sec):
    print('OK: ', end='')
    print('Station ', observer_id, ', ', observer_owner, end='', sep='')
    print(', last seen', '{:.0f}'.format(observer_sec), 'seconds ago.')

def main():
    observer_id, alert_sec=parse_cli()
    observer_owner, observer_last_seen=get_observer(observer_id);
    observer_sec=get_status(observer_last_seen)
    show_status(observer_id, observer_owner, observer_sec, alert_sec)
    
if __name__ == "__main__":
    main();