import datetime
import hashlib
import secrets
import string
import random
import os
import subprocess
import threading
from time import sleep
import db
import config


def generate_random_string(length):
    letters = string.ascii_letters
    random_string = ''.join(random.choice(letters) for i in range(length))
    return random_string


def hash_password(password):
    return hashlib.sha512(password.encode('utf-8')).hexdigest()


def generate_auth_token():
    return secrets.token_urlsafe(32)


def ping_client(ip):
    response = os.system("ping -c 1 " + ip + "> /dev/null")

    if response == 0:
        return True
    else:
        return False


def ssh_thread_function():
    subprocess.run(['wssh', '--fbidhttp=False', '--port='+config.webssh_port])


def check_allocation_thread_function():
    while True:
        ids = db.get_image_allocation_all()
        for x in ids:
            ip = db.get_image_allocation_clientip_id_vpn(x[0])
            ping_thread = PingThread(ip, x[0])
            ping_thread.start()

        sleep(10)


class PingThread(threading.Thread):
    def __init__(self, ip, id):
        super(PingThread, self).__init__()
        self.Ip = ip
        self.Id = id

    def run(self):
        if self.Ip is None:
            return
        if ping_client(self.Ip) == False:
            date = db.get_image_allocation_time_id(self.Id)
            if date is None:
                return
            delta = datetime.datetime.now() - date
            if delta.total_seconds() > 30:
                db.del_image_allocation_id(self.Id)
        else:
            db.update_image_allocation_time(self.Id)


def init_threads():
    ssh_thread = threading.Thread(target=ssh_thread_function)
    ssh_thread.start()

    allocation_thread = threading.Thread(
        target=check_allocation_thread_function)
    allocation_thread.start()