#!/bin/sh /etc/rc.common

START=97

PIDFILE="/tmp/run/watchcat"

append_string() {
	varname="$1"
	add="$2"
	separator="${3:- }"
	actual
	eval "actual=\$$varname"

	new="${actual:+$actual$separator}$add"
	eval "$varname=\$new"
}

time_to_seconds() {
	time=$1

	{ [ "$time" -ge 1 ] 2>/dev/null && seconds="$time"; } ||
		{ [ "${time%s}" -ge 1 ] 2>/dev/null && seconds="${time%s}"; } ||
		{ [ "${time%m}" -ge 1 ] 2>/dev/null && seconds=$((${time%m} * 60)); } ||
		{ [ "${time%h}" -ge 1 ] 2>/dev/null && seconds=$((${time%h} * 3600)); } ||
		{ [ "${time%d}" -ge 1 ] 2>/dev/null && seconds=$((${time%d} * 86400)); }

	echo $seconds
	unset seconds
	unset time
}

load_watchcat() {
	config_get period "$1" period "120"
	config_get mode "$1" mode "restart_iface"
	config_get pinghosts "$1" pinghosts "8.8.8.8"
	config_get pingperiod "$1" pingperiod "60"
	config_get forcedelay "$1" forcedelay "60"
	config_get pingsize "$1" pingsize "standard"
	config_get interface "$1" interface
	config_get mmifacename "$1" mmifacename
	config_get unlockbands "$1" unlockbands "0"

	# Fix potential typo in mode and provide backward compatibility.
	[ "$mode" = "allways" ] && mode="periodic_reboot"
	[ "$mode" = "always" ] && mode="periodic_reboot"
	[ "$mode" = "ping" ] && mode="ping_reboot"
	
	error=""
	warn=""

	# Checks for settings common to all operation modes
	if [ "$mode" != "periodic_reboot" ] && [ "$mode" != "ping_reboot" ] && [ "$mode" != "restart_iface" ]; then
		append_string "error" "mode must be 'periodic_reboot' or 'ping_reboot' or 'restart_iface'" "; "
	fi

	period="$(time_to_seconds "$period")"
	[ "$period" -ge 1 ] ||
		append_string "error" "period has invalid format! Use time value(ex: '30'; '4m'; '6h'; '2d')" "; "

	# ping_reboot mode and restart_iface mode specific checks
	if [ "$mode" = "ping_reboot" ] || [ "$mode" = "restart_iface" ]; then

		if [ -z "$error" ]; then

			pingperiod_default="$((period / 5))"

			pingperiod="$(time_to_seconds "$pingperiod")"
			if [ "$pingperiod" -ge 0 ] && [ "$pingperiod" -ge "$period" ]; then
				pingperiod="$(time_to_seconds "$pingperiod_default")"
				append_string "warn" "pingperiod cannot be greater than $period. Defaulted to $pingperiod_default seconds (1/5 of period)" "; "
			fi

			if [ "$pingperiod" -lt 0 ]; then
				append_string "warn" "pingperiod cannot be a negative value." "; "
			fi

			if [ "$mmifacename" != "" ] && [ "$period" -lt 30 ]; then
				append_string "error" "Check interval is less than 30s. For robust operation with ModemManager modem interfaces it is recommended to set the period to at least 30s."
			fi
		fi
	fi

	# ping_reboot mode and periodic_reboot mode specific checks
	if [ "$mode" = "ping_reboot" ] || [ "$mode" = "periodic_reboot" ]; then
		forcedelay="$(time_to_seconds "$forcedelay")"
	fi

	[ -n "$warn" ] && logger -p user.warn -t "watchcat" "$1: $warn"
	[ -n "$error" ] && {
		logger -p user.err -t "watchcat" "reboot program $1 not started - $error"
		return
	}

	case "$mode" in
	periodic_reboot)
		/usr/bin/watchcat.sh "periodic_reboot" "$period" "$forcedelay" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;forcedelay=$forcedelay)"
		;;
	ping_reboot)
		/usr/bin/watchcat.sh "ping_reboot" "$period" "$forcedelay" "$pinghosts" "$pingperiod" "$pingsize" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;pinghosts=$pinghosts;pingperiod=$pingperiod;forcedelay=$forcedelay;pingsize=$pingsize)"
		;;
	restart_iface)
		/usr/bin/watchcat.sh "restart_iface" "$period" "$pinghosts" "$pingperiod" "$pingsize" "$interface" "$mmifacename" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;pinghosts=$pinghosts;pingperiod=$pingperiod;pingsize=$pingsize;interface=$interface;mmifacename=$mmifacename;unlockbands=$unlockbands)"
		;;
	*)
		echo "Error starting Watchcat service. Invalid mode selection: $mode"
		;;
	esac

	echo $! >>"${PIDFILE}.pids"
}

stop() {
	if [ -f "${PIDFILE}.pids" ]; then
		logger -p user.info -t "watchcat" "stopping all tasks"

		while read pid; do
			kill -KILL "$pid"
		done <"${PIDFILE}.pids"

		rm "${PIDFILE}.pids"

		logger -p user.info -t "watchcat" "all tasks stopped"
	else
		logger -p user.info -t "watchcat" "no tasks running"
	fi
}

start() {
	[ -f "${PIDFILE}.pids" ] && stop

	config_load system
	if [ -n "$(uci show system.@watchcat[0])" ]; then # at least one watchcat section exists
		logger -p user.info -t "watchcat" "starting all tasks"
		config_foreach load_watchcat watchcat
		logger -p user.info -t "watchcat" "all tasks started"
	else
		logger -p user.info -t "watchcat" "no tasks defined"
	fi
}