common

#!/bin/sh

. /lib/lsb/init-functions

FILE=`basename "$0"`
DEVICE_ID="${FILE##*.}"
APP_DIR="/opt/piBeacon"
NODE_APP="app$DEVICE_ID.js"
CONFIG_DIR="$APP_DIR"
PID_DIR="$APP_DIR/pid"
PID_FILE="$PID_DIR/app$DEVICE_ID.pid"
LOG_DIR="$APP_DIR/log"
LOG_FILE="$LOG_DIR/forever$DEVICE_ID.log"
APP_LOG_FILE="$LOG_DIR/app$DEVICE_ID.log"
APP_ERR_FILE="$LOG_DIR/err$DEVICE_ID.log"
NODE_EXEC="/usr/local/bin/forever"
. /etc/default/piBeacon

USAGE="Usage: $0 {start|stop|restart|status}"

pid_file_exists() {
	[ -f "$PID_FILE" ]
}

get_pid() {
	echo "$(cat "$PID_FILE")"
}

is_running() {
	PID=$(get_pid)
	! [ -z "$(ps aux | awk '{print $2}' | grep "^$PID$")" ]
}

start_it() {
	mkdir -p "$PID_DIR"
	mkdir -p "$LOG_DIR"

	if [ -z "$DEVICES" ]
	then
		log_daemon_msg "Cannot start piBeacon. Please fill in DEVICES in /etc/default/piBeacon"
		log_end_msg 1
	elif [ -z "$NAME" ]
	then
		log_daemon_msg "Cannot start piBeacon. Please fill in NAME in /etc/default/piBeacon"
		log_end_msg 1
	elif [ -z "$INTERVAL" ]
	then
		log_daemon_msg "Cannot start piBeacon. Please fill in INTERVAL in /etc/default/piBeacon"
		log_end_msg 1
	fi

	if [ $DEVICES -gt "0" ] && [ "$DEVICE_ID" -lt "$DEVICES" ]
	then
		log_daemon_msg "Starting piBeacon $DEVICE_ID"
		BLENO_HCI_DEVICE_ID="$DEVICE_ID" FOREVER_ROOT="$APP_DIR/.forever" $NODE_EXEC -s -a -l $LOG_FILE -o $APP_LOG_FILE -e $APP_ERR_FILE --pidFile $PID_FILE start "$APP_DIR/$NODE_APP"
		while [ ! -f $PID_FILE ]
		do
			sleep 1
		done
		log_end_msg $?
	else
		log_daemon_msg "Cannot start piBeacon $DEVICE_ID. Increase the number of devices, currently $DEVICES"
		log_end_msg 1
	fi
}

stop_process() {
	FOREVER_ROOT="$APP_DIR/.forever" $NODE_EXEC stop "$APP_DIR/$NODE_APP"
}

remove_pid_file() {
	echo "Removing pid file"
	rm -f "$PID_FILE"
}

start_app() {
	if pid_file_exists
	then
		if is_running
		then
			PID=$(get_pid)
			echo "Node app already running with pid $PID"
			exit 1
		else
			echo "Node app stopped, but pid file exists"
			echo "Forcing start anyways"
			remove_pid_file
			start_it
		fi
	else
		start_it
	fi
}

stop_app() {
	if pid_file_exists
	then
		if is_running
		then
			echo "Stopping node app ..."
			stop_process
			remove_pid_file
			echo "Node app stopped"
		else
			echo "Node app already stopped, but pid file exists"
			echo "Forcing stop anyways ..."
			remove_pid_file
			echo "Node app stopped"
		fi
	else
		echo "Node app already stopped, pid file does not exist"
		exit 1
	fi
}

status_app() {
	if pid_file_exists
	then
		if is_running
		then
			PID=$(get_pid)
			echo "Node app running with pid $PID"
		else
			echo "Node app stopped, but pid file exists"
		fi
	else
		echo "Node app stopped"
	fi
}

case "$1" in
	start)
		start_app
	;;

	stop)
		stop_app
	;;

	restart)
		stop_app
		start_app
	;;

	status)
		status_app
	;;

	*)
		echo $USAGE
		exit 1
	;;
esac