#!/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
	config_get pinghosts	$1 pinghosts
	config_get pingperiod	$1 pingperiod
	config_get nopingtime	$1 nopingtime
	config_get forcedelay	$1 forcedelay
	
	local nopingtime_dflt="900"
	local forcedelay_dflt="60"
	
	# Fix potential typo in mode (backward compatibility).
	[ "$mode" = "allways" ] && mode="always"

	error=""
	warn=""
	
	if [ -z "$period" ] 
	then
		append_string "error" "period is not set! Use time value(ex: '30'; '4m'; '6h'; '2d')." "; "	
	else
		timetoseconds "$period";period="$seconds"	
		[ "$period" -ge 1 ] \
			|| append_string "error" "period has invalid format! Use time value(ex: '30'; '4m'; '6h'; '2d')" "; "	
	fi
	
	[ "$mode" = "always" -o "$mode" = "ping" ] \
		|| append_string "error" "mode must be 'always' or 'ping'" "; "	
	
	if [ -z "$forcedelay" ]
	then
		forcedelay="$forcedelay_dflt"		
		append_string "warn" "forcedelay is not configured! Defaulted to $forcedelay seconds" "; "		
	else
		[ "$forcedelay" -ge 0 ] || {
			forcedelay="$forcedelay_dflt"		
			append_string "warn" "forcedelay is invalid! Defaulted to $forcedelay seconds" "; "		
		}
	fi
	
	[ -z "$error" -a "$mode" = "ping" ] && {			
		[ -z "$pinghosts" ] \
			&& append_string "error" "pinghosts must be set in 'ping' mode! Use space separated address list (ex: '8.8.8.8 9.9.9.9')" "; "
	
		if [ -z "$nopingtime" ]
		then
			nopingtime="$nopingtime_dflt"
			append_string "warn" "nopingtime is not configured! Defaulted to $nopingtime seconds" "; "			
		else
			timetoseconds "$nopingtime";nopingtime="$seconds"
			[ "$nopingtime" -ge 0 ] || {
				nopingtime="$nopingtime_dflt"
				append_string "warn" "nopingtime invalid format! Use time value(ex: '30'; '4m'; '6h'; '2d'). Defaulted to $nopingtime seconds" "; "
			}
		fi
		
		local pingperiod_dflt="$((period/5))"
				
		if [ -z "$pingperiod" ] 
		then
			pingperiod="$pingperiod_dflt"
			append_string "warn" "pingperiod is not configured! Defaulted to $pingperiod seconds(1/5 of period)" "; "
		else
			timetoseconds "$pingperiod";pingperiod="$seconds"
			[ "$pingperiod" -ge 0 -a "$pingperiod" -ge "$period" ] && {
				pingperiod="$pingperiod_dflt"
				append_string "warn" "pingperiod is invalid value(greater than period)! Defaulted to $pingperiod seconds(1/5 of period)" "; "
			}
			[ "$pingperiod" -ge 0 ] || {
				pingperiod="$pingperiod_dflt"				
				append_string "warn" "pingperiod has invalid format! Use time value(ex: '30'; '4m'; '6h'; '2d'). Defaulted to $pingperiod seconds(1/5 of period)" "; "
			}			
		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; }

	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 "ping" "$period" "$forcedelay" "$pinghosts" "$pingperiod" "$nopingtime" &
		logger -p user.info -t "watchcat" "started task (mode=$mode;period=$period;pinghosts=$pinghosts;pingperiod=$pingperiod;forcedelay=$forcedelay;nopingtime=$nopingtime)"
	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
}
