import socket


HOST = "0.0.0.0"
PORT = 10000


def process_message(message: str) -> str:
    return f"TCP server received: {message.upper()}"


server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server.bind((HOST, PORT))
server.listen(1)

print(f"TCP server started on port {PORT}")
print("Send EXIT from client to stop the server")

while True:
    conn, addr = server.accept()
    print(f"Connection from {addr}")

    data = conn.recv(1024)
    if not data:
        conn.close()
        continue

    message = data.decode("utf-8")
    response = process_message(message)
    conn.sendall(response.encode("utf-8"))
    conn.close()

    if message.strip().upper() == "EXIT":
        print("TCP server stopped")
        break

server.close()