from mcstatus import MinecraftServer
from datetime import datetime
from makeline import make_line
from json import loads, dumps
from sys import argv

log_path = '/dev/null'

def get_status():
    time = datetime.now().timestamp()
    try:
        server = MinecraftServer("xkcd.cbouton.com", 25555)
        query = server.query(retries=1)
        players = query.players.names
        return {'time': time, 'status': 'online', 'players': players}
    except:
        return {'time': time, 'status': 'unreachable', 'players': []}


def log(event):
    if event['period'][0] != event['period'][1]:
        with open(log_path+'events.json', 'a') as fout:
            fout.write(dumps(event)+'\n')
        with open(log_path+'events.log', 'a') as fout:
            fout.write(make_line(event)+'\n')


def new_state_and_log():
    prev = {'period': [0,0], 'status': 'undefined', 'players': []}
    cur = get_status()

    with open(log_path+'current-state.json', 'r') as fin:
        prev = loads(fin.read())

    if cur['time'] - prev['period'][1] > 90:
        log(prev)
        log({'period': [prev['period'][1], cur['time']], 'status': 'monitor-offline' })
        return {'period': [cur['time'],cur['time']], 'status': cur['status'], 'players': cur['players']}
    else:
        prev['period'][1] = cur['time']
        if prev['status'] == cur['status'] and prev['players'] == cur['players']:
            return prev
        else:
            log(prev)
            return {'period': [cur['time'],cur['time']], 'status': cur['status'], 'players': cur['players']}


def update():
    next = new_state_and_log()
    if next['status'] != 'online':
        del next['players']

    with open(log_path+'current-state.json', 'w') as fout:
        fout.write(dumps(next))

if __name__ == "__main__":
    if len(argv) > 1:
        log_path = argv[1]+'/'
        update()
    else:
        print('error: specify target path')