#!/usr/bin/python3

"""Implementation of CloudSync launcher and management script"""

import os
import signal
import sys
import time
import logging
from subprocess import Popen

DELAY = 0.5
USAGE_FORMAT = "Usage: ./cs.py <start|stop|restart|status> [debug|info|warning|error]"

arguments = sys.argv
logging_level = logging.INFO


def get_pid():
    proc_list = list(os.popen("ps ax | grep cloud_sync.py | grep -v grep"))
    if len(proc_list) > 0:
        pid = proc_list[0].split()[0]
        return pid
    else:
        return None


def start():
    cs_proc = get_pid()
    if cs_proc:
        print("CloudSync app already running")
    else:
        print("Starting CloudSync app with logging level {0}".format(logging_level))
        time.sleep(DELAY)
        Popen(['python3', 'cloud_sync.py', str(logging_level)])


def stop():
    cs_proc_pid = get_pid()
    if cs_proc_pid:
        print("Stopping CloudSync app...")
        time.sleep(DELAY)
        os.kill(int(cs_proc_pid), signal.SIGKILL)
    else:
        print("CloudSync app is not running.")


if len(arguments) == 2 or len(arguments) == 3:
    if len(arguments) == 3:
        if arguments[2] == "debug":
            logging_level = logging.DEBUG
        elif arguments[2] == "info":
            logging_level = logging.INFO
        elif arguments[2] == "warning":
            logging_level = logging.WARNING
        elif arguments[2] == "error":
            logging_level = logging.ERROR
        else:
            print(USAGE_FORMAT)
    if arguments[1] == "start":
        start()
    elif str(arguments[1]) == "stop":
        stop()
    elif arguments[1] == "restart":
        print("Restarting CloudSync app...")
        time.sleep(DELAY)
        stop()
        start()
    elif arguments[1] == "status":
        cs_proc = get_pid()
        if cs_proc:
            print("CloudSync app IS running")
        else:
            print("CloudSync app IS NOT running")
    else:
        print(USAGE_FORMAT)
else:
    print(USAGE_FORMAT)