#!/usr/bin/env python2
# -*-coding:UTF-8 -*


import time
import datetime
import calendar
import redis
import os
import signal
from subprocess import PIPE, Popen
import ConfigParser
import json
from prettytable import PrettyTable

# CONFIG VARIABLES
threshold_stucked_module = 60*60*1 #1 hour
refreshRate = 1
log_filename = "../logs/moduleInfo.log"
command_search_pid = "ps a -o pid,cmd | grep {}"
command_restart_module = "screen -S \"Script\" -X screen -t \"{}\" bash -c \"./{}.py; read x\""


def getPid(module):
    p = Popen([command_search_pid.format(module+".py")], stdin=PIPE, stdout=PIPE, bufsize=1, shell=True)
    for line in p.stdout:
        splittedLine = line.split()
        if 'python2' in splittedLine:
            return int(splittedLine[0])
        else:
            return None


def kill_module(module):
    print ''
    print '-> trying to kill module:', module

    pid = getPid(module)
    if pid is not None:
        os.kill(pid, signal.SIGUSR1)
        time.sleep(1)
        if getPid(module) is None:
            print module, 'has been killed'
            print 'restarting', module, '...'
            p2 = Popen([command_restart_module.format(module, module)], stdin=PIPE, stdout=PIPE, bufsize=1, shell=True)

        else:
            print 'killing failed, retrying...'
            time.sleep(3)
            os.kill(pid, signal.SIGUSR1)
            time.sleep(1)
            if getPid(module) is None:
                print module, 'has been killed'
                print 'restarting', module, '...'
                p2 = Popen([command_restart_module.format(module, module)], stdin=PIPE, stdout=PIPE, bufsize=1, shell=True)
            else:
                print 'killing failed!'
    time.sleep(7)


if __name__ == "__main__":

    configfile = os.path.join(os.environ['AIL_BIN'], 'packages/config.cfg')
    if not os.path.exists(configfile):
        raise Exception('Unable to find the configuration file. \
                        Did you set environment variables? \
                        Or activate the virtualenv.')
    
    cfg = ConfigParser.ConfigParser()
    cfg.read(configfile)

    # REDIS #
    server = redis.StrictRedis(
        host=cfg.get("Redis_Queues", "host"),
        port=cfg.getint("Redis_Queues", "port"),
        db=cfg.getint("Redis_Queues", "db"))

    while True:

        table1 = PrettyTable(['#', 'Queue', 'Amount', 'Paste start time', 'Processing time for current paste (H:M:S)', 'Paste hash'], sortby="Processing time for current paste (H:M:S)", reversesort=True)
        table2 = PrettyTable(['#', 'Queue', 'Amount', 'Paste start time', 'Time since idle (H:M:S)', 'Last paste hash'], sortby="Time since idle (H:M:S)", reversesort=True)
        num = 0
        for queue, card in server.hgetall("queues").iteritems():
            key = "MODULE_" + queue
            value = server.get(key)
            if value is not None:
                timestamp, path = value.split(", ")
                if timestamp is not None and path is not None:
                    num += 1
                    startTime_readable = datetime.datetime.fromtimestamp(int(timestamp))
                    processed_time_readable = str((datetime.datetime.now() - startTime_readable)).split('.')[0]

                    if int(card) > 0:
                        if int((datetime.datetime.now() - startTime_readable).total_seconds()) > threshold_stucked_module:
                            log = open(log_filename, 'a')
                            log.write(json.dumps([queue, card, str(startTime_readable), str(processed_time_readable), path]) + "\n")
                            kill_module(queue)

                        table1.add_row([num, queue, card, startTime_readable, processed_time_readable, path])

                    else:
                        table2.add_row([num, queue, card, startTime_readable, processed_time_readable, path])

        os.system('clear') 
        print 'Working queues:\n'
        print table1
        print '\n'
        print 'Ideling queues:\n'
        print table2
        time.sleep(refreshRate)