#!/bin/bash
IFACE={{ discovered_wireless_iface }}
NETPLAN=0
SSID=""
# covers systemd-networkd
if [ -f /etc/wpa_supplicant/wpa_supplicant-$IFACE.conf ]; then
    SSID=`grep ssid /etc/wpa_supplicant/wpa_supplicant-$IFACE.conf | awk -F = '{print $2}' | sed -r s/\"// | sed -r s/\"//`
fi

# covers raspbian
if [ -f /etc/wpa_supplicant/wpa_supplicant.conf ]; then
    SSID=`grep ssid /etc/wpa_supplicant/wpa_supplicant.conf | awk -F = '{print $2}' | sed -r s/\"// | sed -r s/\"//`
fi

# covers netplan
if [ -f /run/netplan/wpa-$IFACE.conf ]; then
    NETPLAN=1
    SSID=`grep ssid /run/netplan/wpa-$IFACE.conf | awk -F = '{print $2}' | sed -r s/\"// | sed -r s/\"//`
    sed 's|ctrl_interface=/run/wpa_supplicant|&\ncountry={{ host_country_code }}|' /run/netplan/wpa-$IFACE.conf
fi
# IIAB hint for NetworkManager
if [ -f /etc/iiab/iiab.env ]; then
    source /etc/iiab/iiab.env
    if [ ! -z $CLIENT_SSID ]; then
       SSID=$CLIENT_SSID
    fi
fi
sleep 2
wpa_cli -i $IFACE scan > /dev/null
sleep 1
FREQ=`wpa_cli -i $IFACE scan_results | grep $SSID | awk '{print $2}'`
for result in $FREQ; do
    echo "frequency is $result for $SSID"
    if [ $result -lt 2485 ]; then
        FREQ2=$result
    fi
done
echo "Using $FREQ2 for $SSID"

CHAN=$(($FREQ2 - 2407 ))
CHAN=$(($CHAN / 5 ))
echo "channel is $CHAN for $SSID"
cp /etc/hostapd/hostapd.conf.iiab /etc/hostapd/hostapd.conf
sed -i -e "s/^channel.*/channel=$CHAN/" /etc/hostapd/hostapd.conf
systemctl stop wpa_supplicant
systemctl start hostapd
systemctl start wpa_supplicant
if [ $NETPLAN -eq 1 ]; then
    systemctl restart netplan-wpa-wlan0.service
fi
systemctl stop dnsmasq.service
systemctl start dnsmasq.service
exit 0