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# distributed with this work for additional information
# regarding copyright ownership.  The SFC licenses this file
# to you 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.

# module for getting the lan ip address of the computer
import os
import socket

if os.name != "nt":
    import fcntl
    import struct

    def get_interface_ip(ifname):
        def _bytes(value, encoding):
            return bytes(value, encoding)

        sckt = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        return socket.inet_ntoa(
            fcntl.ioctl(sckt.fileno(), 0x8915, struct.pack("256s", _bytes(ifname[:15], "utf-8")))[20:24]  # SIOCGIFADDR
        )


def get_lan_ip():
    if os.environ.get("CI") == "true":
        return "0.0.0.0"

    try:
        ip = socket.gethostbyname(socket.gethostname())
    except Exception:
        return "0.0.0.0"
    if ip.startswith("127.") and os.name != "nt":
        interfaces = [
            "eth0",
            "eth1",
            "eth2",
            "en0",
            "en1",
            "en2",
            "en3",
            "en4",
            "eno0",
            "eno1",
            "eno2",
            "eno3",
            "eno4",
            "wlan0",
            "wlan1",
            "wifi0",
            "ath0",
            "ath1",
            "ppp0",
        ]
        for ifname in interfaces:
            try:
                ip = get_interface_ip(ifname)
                break
            except OSError:
                pass
    return ip
