#!/usr/bin/env python

from __future__ import print_function
from __future__ import absolute_import

import os
import sys
import time
import signal
import subprocess
import re

from six.moves import range
from typing import IO, Text

TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
successful_worker_launches = [
    'launching queue worker thread error_reports',
    'launching queue worker thread user_presence',
    'launching queue worker thread digest_emails',
    'launching queue worker thread slow_queries',
    'launching queue worker thread missedmessage_mobile_notifications',
    'launching queue worker thread feedback_messages',
    'launching queue worker thread signups',
    'launching queue worker thread test',
    'launching queue worker thread message_sender',
    'launching queue worker thread missedmessage_emails',
    'launching queue worker thread email_mirror',
    'launching queue worker thread user_activity_interval',
    'launching queue worker thread invites',
    'launching queue worker thread user_activity'
]

def check_worker_launch(logfile):
    # type: (IO) -> Text
    def check(content):
        # type: (str) -> bool
        flag = True
        for entry in successful_worker_launches:
            flag = flag and entry in content
        return flag

    failed = True
    log_output = u''
    print("Polling logfile", end='')
    # Attempt to poll the log file for 10 sec. to see if all worker threads are launched.
    for i in range(100):
        time.sleep(0.3)
        sys.stdout.write('.')
        sys.stdout.flush()
        logfile.seek(0)
        content = logfile.read()
        log_output = content
        if check(content):
            failed = False
            break
    sys.stdout.write('\n')

    if not failed:
        print('Worker threads launched successfully')
        return log_output
    else:
        print('Error in server startup. Dumping logs')
        print(log_output)
        sys.exit(1)

if __name__ == '__main__':
    print('\nStarting Development Server')
    logfile = open('/tmp/run-dev-output', 'w+')
    args = ["{}/run-dev.py".format(TOOLS_DIR)]
    run_dev = subprocess.Popen(args, stdout=logfile, stderr=logfile)

    check_worker_launch(logfile)
    logfile.truncate(0)

    print("Attempting to modify a file")
    subprocess.call(['touch', 'zerver/lib/actions.py'])
    check_worker_launch(logfile)

    run_dev.send_signal(signal.SIGINT)
    run_dev.wait()
    logfile.close()