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

START=97

PIDFILE="/tmp/run/watchcat"

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

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

timetoseconds() {
	local time=$1
	unset seconds

	{ [ "$time" -ge 1 ] 2> /dev/null && seconds="$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)); }
}

load_watchcat() {
	config_get period	$1 period
	config_get mode		$1 mode		"always"
	config_get pinghosts	$1 pinghosts	"8.8.8.8"
	config_get pingperiod	$1 pingperiod
	config_get forcedelay	$1 forcedelay	"0"

	# Fix potential typo in mode (backward compatibility).
	[ "$mode" = "allways" ] && mode="always"

	error=""

	timetoseconds "$period"
	period="$seconds"
	[ "$period" -ge 1 ] \
		|| append_string "error" 'period is not a valid time value (ex: "30"; "4m"; "6h"; "2d")' "; "
	[ "$mode" = "always" -o "$mode" = "ping" ] \
		|| append_string "error" "mode must be 'always' or 'ping'" "; "
	[ -n "$pinghosts" -o "$mode" = "always" ] \
		|| append_string "error" "pinghosts must be set when in 'ping' mode" "; "
	[ "$mode" = "ping" ] && {
		if [ -n "$pingperiod" ]
		then
			timetoseconds "$pingperiod"
			pingperiod="$seconds"
			if [ "$pingperiod" -ge 0 ]
			then
				[ "$pingperiod" -lt "$period" ] \
					|| append_string "error" "pingperiod must be less than period" "; "
			else
				append_string "error" 'pingperiod is not a valid time value (ex: "30"; "4m"; "6h"; "2d")' "; "
			fi
		else
			pingperiod="$((period/20))"
		fi
	}
	[ "$forcedelay" -ge 0 ] \
		|| append_string "error" "forcedelay must be a integer greater or equal than 0, where 0 means disabled" "; "

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

	if [ "$mode" = "always" ]
	then
		/usr/bin/watchcat.sh "always" "$period" "$forcedelay" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;forcedelay=$forcedelay)"
	else
		/usr/bin/watchcat.sh "period" "$period" "$forcedelay" "$pinghosts" "$pingperiod" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;pinghosts=$pinghosts;pingperiod=$pingperiod;forcedelay=$forcedelay)"
	fi

	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])" ] # at least one watchcat section exists
	then
		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
}