#!/usr/bin/env bash
# The MIT License (MIT)
#	
# reset-to-default-antennas-when-no-users-online 
#
# Copyright (c) 2017 Kari Karvonen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# Specify default antennas. This can be single antenna on comma separated
# list many antennas 
# DEFAULT_ANTENNAS=1,2,7
DEFAULT_ANTENNAS=2

# do no change below this line

if [ "x`which curl`" == "x" ]; then
        echo "curl not found. Please install curl."
        echo "sudo apt-get install curl"
        exit 1
else
        CURLEXEC=`which curl`
fi

if [ "x`which jq`" == "x" ]; then
        echo "jq not found. Please install jq."
        echo "sudo apt-get install jq"
        exit 1
else
        JQEXEC=`which jq`
fi

ANTSWITCHEXEC=/root/extensions/ant_switch/frontend/ant-switch-frontend
ADMINJSON=/root/kiwi.config/admin.json
KIWIJSON=/root/kiwi.config/kiwi.json

if ! [[ -x "$ANTSWITCHEXEC" ]]; then
	echo "$0: Antenna switch script $ANTSWITCHEXEC not found or it is not executable. Exit."
	exit 1
fi

if ! [[ -r "$ADMINJSON" ]]; then
        echo "$0: $ADMINJSON not found or it is not readable. Exit."
        exit 1
fi
CURLOPTS=" --silent --connect-timeout 1"
PORT=`$JQEXEC .port $ADMINJSON`
STATUSURL="http://127.0.0.1:$PORT/status"

FORBIDSWITCH=`$JQEXEC .ant_switch.denyswitching $KIWIJSON`
if [ "$FORBIDSWITCH" != "0" ]; then
	echo "Antenna switching denied by configuration, not switching."
	exit 1
fi

THUNDERSTORM=`$JQEXEC .ant_switch.thunderstorm $KIWIJSON`
if [ "$THUNDERSTORM" == "1" ]; then
	echo "Antenna switching denied by thunderstorm mode, not switching."
	exit 1
fi


STATUS=`$CURLEXEC $STATUSURL $CURLOPTS`
if [ "x$STATUS" == "x" ]; then
	echo "$0: Status url $STATUSURL could not be retriewed. Exit."
	exit 1
fi

ONLINEUSERS=`echo $STATUS | sed -e "s/.* users=\([0-9]\) .*/\1/"`
re='^[0-9]+$'
if ! [[ $ONLINEUSERS =~ $re ]] ; then
	echo "$0: Cannot parse users number from $STATUSURL. Exit."
	exit 1
fi

if [ "$ONLINEUSERS" == "0" ]; then
	# No users online, switch to default antennas
	selected=`$ANTSWITCHEXEC s | sed -e 's/^Selected antennas: //'`
	if [ "$selected" != "$DEFAULT_ANTENNAS" ]; then
		ANTENNAS=`echo $DEFAULT_ANTENNAS | tr ',' ' '`
		$ANTSWITCHEXEC g
		for antenna in $ANTENNAS; do
			$ANTSWITCHEXEC +$antenna
		done
	fi
fi