#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import paho.mqtt.subscribe as subscribe
import paho.mqtt.publish as publish
import subprocess
import argparse
import json
import os
import logging

class CurrentClients:
    def __init__(self, args):
        with open(args.config_json, "r") as file:
            data = json.load(file)
        self.active_clients_list = [client["username"] for client in data["clients"]]
        self.active_clients_pids = {}
        for username in self.active_clients_list:
            if username.endswith("_ase"):
                self.start_client(username, args)

    def list(self):
        return self.active_clients_list

    def pids(self):
        return self.active_clients_pids

    def add(self, client, args):
        self.active_clients_list.append(client)
        self.start_client(client, args) if client.endswith("_ase") else None

    def remove(self, client):
        self.active_clients_list.remove(client)
        self.stop_client(client) if client.endswith("_ase") else None

    def start_client(self, client, args):
        process = subprocess.Popen(
            ["python3", args.sub_process, client],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True
        )
        self.active_clients_pids[client] = process.pid
        logging.info(f"Started process for {client}, PID: {process.pid}")

    def stop_client(self, client):
        logging.info(f"Terminating process for {client} (PID: {self.active_clients_pids[client]})")
        os.kill(self.active_clients_pids[client], 9)

def get_client_list(args):
    publish.single(args.pub_topic, args.list_clients_cmd, hostname=args.host, port=args.port, auth={'username': args.username, 'password': args.password})

def create_client(datas, args, cur_clients):
    get_client_list(args)

def delete_client(datas, args, cur_clients):
    get_client_list(args)

def list_client(datas, args, cur_clients):
    list_clients = datas['responses'][0]['data']['clients']

    delta_clients_add = set(list_clients) - set(cur_clients.list())
    [cur_clients.add(item,args) for item in delta_clients_add]

    delta_clients_del = set(cur_clients.list()) - set(list_clients)
    [cur_clients.remove(item) for item in delta_clients_del]

def ctrl_client_mod(client, userdata, message):

    command_functions = {
        "createClient": create_client,
        "deleteClient": delete_client,
        "listClients": list_client,
    }

    datas = json.loads(message.payload)
    target_commands = {"createClient", "deleteClient", "listClients"}
    found_command = [item["command"] for item in datas['responses'] if item["command"] in target_commands]
    if found_command:
        command_functions[found_command[0]](datas, args, userdata)

parser = argparse.ArgumentParser()

parser.add_argument('-H', '--host', required=False, default="mqtt")
parser.add_argument('-t', '--sub_topic', required=False, default="$CONTROL/dynamic-security/v1/response")
parser.add_argument('-T', '--pub_topic', required=False, default="$CONTROL/dynamic-security/v1")
parser.add_argument('-q', '--qos', required=False, type=int,default=0)
parser.add_argument('-u', '--username', required=False, default="admin")
parser.add_argument('-p', '--password', required=False, default="BatManu#171017")
parser.add_argument('-P', '--port', required=False, type=int, default=1883)

args = parser.parse_args()
args.list_clients_cmd = '{"commands":[{"command":"listClients"}]}'
args.config_json = './dynamic-security.json'
args.sub_process = './subscribe_ase_receiver.py'

# Configure logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

cur_clients = CurrentClients(args)

try:
    subscribe.callback(ctrl_client_mod, hostname=args.host, port=args.port, topics=args.sub_topic, auth={'username': args.username, 'password': args.password}, userdata=cur_clients)
except (KeyboardInterrupt, Exception) as e:
    logging.info("Terminating: ....")

    for client in cur_clients.list():
        cur_clients.stop_client(client) if client.endswith("_ase") else None