import subprocess
import time
import socket
import os
import logging

from datetime import datetime
from pathlib import Path

from src.My_Logger.project_logger import LoggerClass

LOG_PATH = Path(__file__).parent / 'logs'


def is_port_in_use(port: int) -> bool:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        return s.connect_ex(('192.168.195.194', port)) == 0


def start_server():
    """
    launch a micro service using gunicorn
    :return:
    """
    launch_file_name = 'run_service_backend'    # file name of the entrance point
    pid_path = LOG_PATH / 'pid.txt'

    IP = '192.168.195.194'
    PORT = 59001
    WORKER = 1
    TIME_OUT = 60
    THREADS = 5
    logger = LoggerClass().get_log(logging.INFO)

    if is_port_in_use(PORT):
        logger.error(f'Port {PORT} already in use')
        return

    now = datetime.now()

    cmd = [
        "nohup",
        "/home/armor/anaconda3/envs/py311/bin/gunicorn",
        "--threads", str(THREADS),
        "--workers", str(WORKER),
        "--bind", f"{IP}:{PORT}", f"{launch_file_name}:app",
        "--timeout", str(TIME_OUT),
        "--pid", pid_path
    ]
    stdout_file = LOG_PATH / f"console_{now.year}-{now.month}-{now.day}.log"
    pid = subprocess.Popen(cmd, stdout=stdout_file.open('a'), stderr=subprocess.STDOUT, close_fds=True, start_new_session=True).pid
    time.sleep(5)

    if not is_port_in_use(PORT) or not os.path.exists(pid_path) or str(pid) != pid_path.read_text().strip():
        logger.error(f'Failed to start server, check {stdout_file} and {pid_path}')
        print(f">> tail {stdout_file}")
        subprocess.run(["tail", str(stdout_file)])
        return

    info_str = f"Server started"
    logger.info(info_str)
    logger.info(f"server running at {IP}:{PORT} with pid {pid}")


if __name__ == "__main__":
    start_server()