# Copyright (c) 2025, NVIDIA CORPORATION.  All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import socket
import time


def find_free_port() -> int:
    """Find a free port to use for the server."""
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind(("127.0.0.1", 0))
        s.listen(1)
        port = s.getsockname()[1]
    return port


def is_port_open(host, port, timeout=0.5) -> bool:
    """Check if the given port is open on the host."""
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.settimeout(timeout)
    result = sock.connect_ex((host, port))
    sock.close()
    return result == 0


def wait_for_server(host, port, max_wait=5, interval=0.2) -> bool:
    """Wait for server to be ready with timeout."""
    start_time = time.time()
    while time.time() - start_time < max_wait:
        if is_port_open(host, port):
            return True
        time.sleep(interval)
    return False