import socket
import logging

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


def run_tcp_server():
    HOST = '127.0.0.1'
    PORT = 10000

    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server_socket:
        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        server_socket.bind((HOST, PORT))
        server_socket.listen(5)

        print(f"SERVER: TCP сервер запущен на {HOST}:{PORT}")
        print("SERVER: Ожидание подключений...")
        print("SERVER: Нажмите Ctrl+C для остановки\n")

        try:
            while True:
                client_socket, client_address = server_socket.accept()
                print(f"SERVER: Клиент {client_address} подключился")

                try:
                    while True:
                        data = client_socket.recv(1024)

                        if not data:
                            print(f"SERVER: Клиент {client_address} отключился")
                            break

                        received_text = data.decode('utf-8')
                        print(f"SERVER: Получено '{received_text}' от {client_address}")

                        modified_data = data.upper()
                        client_socket.sendall(modified_data)
                        print(f"SERVER: Отправлено '{modified_data.decode('utf-8')}'")

                        if modified_data == b'EXIT':
                            print(f"SERVER: Команда EXIT от {client_address}")
                            break

                except ConnectionResetError:
                    print(f"SERVER: Клиент {client_address} разорвал соединение")
                except Exception as e:
                    print(f"SERVER: Ошибка с {client_address}: {e}")
                finally:
                    client_socket.close()
                    print(f"SERVER: Соединение с {client_address} закрыто\n")

        except KeyboardInterrupt:
            print("\nSERVER: Остановка сервера...")


if __name__ == '__main__':
    run_tcp_server()