#!/usr/bin/env python3

# Copyright (C) 2021 The naxalnet Authors

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Setup a working BATMAN Advanced network
with systemd-networkd and iwd
"""

import sys
from pathlib import Path
from shutil import copy

# from dasbus.connection import SystemMessageBus
from dasbus.error import DBusError
from iwd import IWD, Device, Adapter

NETWORKD_CONFIGS = "/usr/share/naxalnet/networkd"
NETWORKD_VOLATILE_DIR = "/run/systemd/network"
ADHOC_SSID = "HelloWorld"
AP_SSID = "NaxalNet"
AP_PASSWD = "naxalnet256"
# Copy networkd configs to volatile dir.
# The D-Bus API does not support creating new interfaces
# or linking to bridges. So we use config files.
# See man:systemd.network(5)

try:
    print("Copying network config files")
    dest = Path(NETWORKD_VOLATILE_DIR)
    src = Path(NETWORKD_CONFIGS)

    # Create the volatile directory if it doesn't exist
    dest.mkdir(parents=True, exist_ok=True)

    # Copy all files in src to dest
    for i in src.iterdir():
        copy(i, dest)
except PermissionError as error:
    print(error)
    sys.exit("Make sure you are root")

# Now, the iwd part
try:
    iwd = IWD()
    devices = iwd.get_devices()
    adhoc_devices = []
    ap_devices = []

    for i in devices:
        d = Device(i)
        a = Adapter(d.adapter)
        if a.supports_mode("ad-hoc"):
            adhoc_devices.append(i)
        if a.supports_mode("ap"):
            ap_devices.append(i)

    if len(adhoc_devices) != 0:
        # Start ad-hoc on first device supporting ad-hoc
        adhoc_device = Device(adhoc_devices.pop())
        # The same device is likely to have ap support too.
        # But we can't start ad-hoc and ap on the same interface.
        # Remove dev1 from ap_devices if it exists there
        if adhoc_device.name in ap_devices:
            ap_devices.remove(adhoc_device.name)
        print("Working on ad-hoc")
        adhoc_device.start_adhoc_open(ADHOC_SSID)
        # Start Access point if ap_device is not empty,
        # ie, we have more devices
        if len(ap_devices) != 0:
            print("Working on AP")
            ap_device = ap_devices.pop()
            # _TODO: start ap after implementing in in iwd.py
except DBusError as e:
    print(e)
    sys.exit("An error occured while communicating with iwd")

print("Bye")