#!/bin/bash
################################################################################
# Copyright 2026 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-static-ip-watcher"
SERVICE_FILE="${NAME}.service"
CONFIG_FILE="/etc/modalai/${NAME}.conf"
USER=$(whoami)


print_usage () {
	echo ""
	echo "Usage:"
	echo "voxl-configure-static-ip-watcher {MODE}"
	echo ""
	echo "Valid Modes are:"
	echo ""
	echo "disable              	     disable the service"
	echo "factory_enable             enable the service, reset config file to defaults"
	echo "factory_enable_dgcs_pilot  enable the service, configure for DGCS pilot"
	echo "factory_enable_dgcs_tower  enable the service, configure for DGCS tower"
	echo "factory_enable_dtc_vrx     enable the service, configure for DTC VRX"
	echo "factory_enable_dtc_drone   enable the service, configure for DTC drone"
	echo "enable                     enable the service, leave config file alone"
	echo ""
	echo ""
	echo "show this help message:"
	echo "voxl-configure-static-ip-watcher help"
	echo ""
	exit 0
}


## set a top-level parameter (e.g., debug)
set_param () {
	if [ "$#" != "2" ]; then
		echo "set_param expected 2 args"
		exit 1
	fi
	local var="$1"
	local val="$2"
	local tmp=$(mktemp)
	jq ".$var = $val" "${CONFIG_FILE}" > "$tmp" && mv "$tmp" "${CONFIG_FILE}"
}

## set an interface parameter by index
## Args: index, field, value (string)
set_interface_param () {
	if [ "$#" != "3" ]; then
		echo "set_interface_param expected 3 args (index, field, value)"
		exit 1
	fi
	local idx="$1"
	local field="$2"
	local val="$3"
	local tmp=$(mktemp)
	jq ".interfaces[$idx].$field = \"$val\"" "${CONFIG_FILE}" > "$tmp" && mv "$tmp" "${CONFIG_FILE}"
}

## add a new interface entry
## Args: network_interface, static_ip, netmask
add_interface () {
	if [ "$#" != "3" ]; then
		echo "add_interface expected 3 args (network_interface, static_ip, netmask)"
		exit 1
	fi
	local iface="$1"
	local ip="$2"
	local mask="$3"
	local tmp=$(mktemp)
	jq ".interfaces += [{\"network_interface\": \"$iface\", \"static_ip\": \"$ip\", \"netmask\": \"$mask\"}]" \
		"${CONFIG_FILE}" > "$tmp" && mv "$tmp" "${CONFIG_FILE}"
}

## clear all interfaces from config
clear_interfaces () {
	local tmp=$(mktemp)
	jq ".interfaces = []" "${CONFIG_FILE}" > "$tmp" && mv "$tmp" "${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 "Done configuring ${NAME}"
	echo "Service will start on next reboot"
	exit 0
}

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

factory_enable_dgcs_pilot () {
	echo "configuring for DGCS pilot"
	reset_config_file_to_default
	clear_interfaces
	add_interface "eth0" "10.0.0.2" "255.255.255.0"
	set_param "debug" "0"
}

factory_enable_dtc_vrx () {
	echo "configuring for DTC VRX"
	reset_config_file_to_default
	clear_interfaces
	add_interface "eth0" "10.0.0.2" "255.255.255.0"
	add_interface "eth1" "192.168.0.101" "255.255.255.0" # for DTC
	set_param "debug" "0"
}

factory_enable_dgcs_tower () {
	echo "configuring for DGCS tower"
	reset_config_file_to_default
	clear_interfaces
	add_interface "eth0" "10.0.0.10" "255.255.255.0"
	set_param "debug" "0"
}

factory_enable_dtc_drone () {
	echo "configuring for DTC drone"
	reset_config_file_to_default
	clear_interfaces
	add_interface "eth0" "192.168.0.100" "255.255.255.0"
	set_param "debug" "0"
}


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

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

if ! command -v jq >/dev/null 2>&1; then
	echo "jq is required but not found. Please install jq."
	exit 1
fi

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

## parse arguments
case ${arg} in
	"")
		print_usage
		exit 0
		;;

	"h"|"-h"|"help"|"--help")
		print_usage
		exit 0
		;;

	"disable")
		disable_service_and_exit
		;;

	"factory_enable")
		echo "configuring defaults"
		reset_config_file_to_default
		enable_service_and_exit
		;;

	"factory_enable_dgcs_pilot")
		factory_enable_dgcs_pilot
		enable_service_and_exit
		;;

	"factory_enable_dgcs_tower")
		factory_enable_dgcs_tower
		enable_service_and_exit
		;;

	"factory_enable_dtc_vrx")
		factory_enable_dtc_vrx
		enable_service_and_exit
		;;
	
	"factory_enable_dtc_drone")
		factory_enable_dtc_drone
		enable_service_and_exit
		;;

	"enable")
		enable_service_and_exit
		;;
	*)
		echo "invalid option"
		print_usage
		exit 1
esac



################################################################################
## no option given, print help
################################################################################
print_usage