#!/bin/bash
################################################################################
# Copyright 2022 ModalAI Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# 4. The Software is used solely in conjunction with devices provided by
#    ModalAI Inc.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
################################################################################

NAME="voxl-remote-id"
SERVICE_FILE="${NAME}.service"
CONFIG_FILE="/etc/modalai/${NAME}.conf"
USER=$(whoami)


print_usage () {
	echo ""
	echo "Start wizard with prompts:"
	echo "voxl-configure-remote-id"
	echo ""
	echo "Shortcut configuration arguments for scripted setup."
	echo "factory_enable will reset the config file to factory defaults"
	echo "before enabling the service."
	echo ""
	echo "voxl-configure-remote-id disable"
	echo "voxl-configure-remote-id factory_disable"
	echo "voxl-configure-remote-id factory_enable"
	echo "voxl-configure-remote-id enable"
	echo ""
	echo "show this help message:"
	echo "voxl-configure-remote-id help"
	echo ""
	exit 0
}


## set most parameters which don't have quotes in json
set_param () {
	if [ "$#" != "2" ]; then
		echo "set_param expected 2 args"
		exit 1
	fi

	# remove quotes if they exist
	var=$1
	var="${var%\"}"
	var="${var#\"}"
	val=$2
	val="${val%\"}"
	val="${val#\"}"

	sed -E -i "/\"$var\":/c\	\"$var\":	$val," ${CONFIG_FILE}
}

## set string parameters which need quotes in json
set_param_string () {
	if [ "$#" != "2" ]; then
		echo "set_param_string expected 2 args"
		exit 1
	fi
	var=$1
	var="${var%\"}"
	var="${var#\"}"
	sed -E -i "/\"$var\":/c\	\"$var\":	\"$2\"," ${CONFIG_FILE}
}


disable_service_and_exit () {
	echo "disabling ${NAME} systemd service"
	systemctl disable ${SERVICE_FILE}
	echo "stopping ${NAME} systemd service"
	systemctl stop ${SERVICE_FILE}
	echo "Done configuring ${NAME}"
	exit 0
}

enable_service_and_exit () {
	echo "enabling  ${NAME} systemd service"
	systemctl enable  ${SERVICE_FILE}
	echo "starting  ${NAME} systemd service"
	systemctl restart  ${SERVICE_FILE}
	echo "Done configuring ${NAME}"
	exit 0
}

reset_config_file_to_default () {
	echo "wiping old config file"
	rm -rf ${CONFIG_FILE}
	${NAME} -c
}


################################################################################
## actual start of execution, handle optional arguments first
################################################################################

## sanity checks
if [ "${USER}" != "root" ]; then
	echo "Please run this script as root"
	exit 1
fi


## convert argument to lower case for robustness
arg=$(echo "$1" | tr '[:upper:]' '[:lower:]')

## parse arguments
case ${arg} in
	"")
		echo "Starting Wizard"
		;;
	"h"|"-h"|"help"|"--help")
		print_usage
		exit 0
		;;
	"disable")
		disable_service_and_exit
		;;
	"factory_disable")
		reset_config_file_to_default
		disable_service_and_exit
		;;
	"factory_enable")
		reset_config_file_to_default
		enable_service_and_exit
		;;
	"enable")
		enable_service_and_exit
		;;
	*)
		echo "invalid option"
		print_usage
		exit 1
esac



################################################################################
## no optional arguments, start config wizard prompts
################################################################################

echo " "
echo "Do you want to reset the config file to factory defaults?"
select opt in "yes" "no"; do
case $opt in
yes )
	reset_config_file_to_default
	break;;
no )
	echo "loading and updating config file with ${NAME} -c"
	${NAME} -c
	break;;
*)
	echo "invalid option"
	esac
done


# ask if the user wants the service enabled or not
echo " "
echo "Do you want to enable the voxl-remote-id service"
select opt in "yes" "no"; do
case $opt in
yes )
	echo " "
	echo "Now we are going to do a preliminary configuration of ${CONFIG_FILE}"
	break;;
no )
	disable_service_and_exit
	break;;
*)
	echo "invalid option"
	esac
done


## ask operator id question
echo ""
echo "Please enter your operator registration ID"
echo "Some regulations require operators to include their operator id in the"
echo "remote ID packets. If the rule in your area doesn't require this,"
echo "you can press enter to leave this option empty"
read OPERATORID
if [ "${OPERATORID}" != "" ]; then
	echo "setting operator_id to ${OPERATORID}"
	set_param_string operator_id ${OPERATORID}
fi


# all done!
enable_service_and_exit
