#!/bin/bash

WORKSPACE=$(cd $(dirname $0)/; pwd)
cd $WORKSPACE

mkdir -p var

module=agent
app=falcon-$module
conf=cfg.json
pidfile=var/app.pid
logfile=var/app.log

[[ -f $app ]] || mv $module $app
[[ -f $conf ]] || cp cfg.example.json $conf

function check_pid() {
    if [ -f $pidfile ];then
        pid=`cat $pidfile`
        if [ -n $pid ]; then
            running=`ps -p $pid|grep -v "PID TTY" |wc -l`
            return $running
        fi
    fi
    return 0
}

function start() {
    check_pid
    running=$?
    if [ $running -gt 0 ];then
        echo -n "$app now is running already, pid="
        cat $pidfile
        return 1
    fi

    nohup ./$app -c $conf &> $logfile &
    echo $! > $pidfile
    echo "$app started..., pid=$!"
}

function stop() {
    pgrep $app | xargs kill &>/dev/null
    echo "$app stoped..."
}

function restart() {
    stop
    sleep 1
    start
}

function status() {
    check_pid
    running=$?
    if [ $running -gt 0 ];then
        echo -n "$app now is running, pid="
        cat $pidfile
    else
        echo "$app is stoped"
    fi
}

function help() {
    echo "$0 start|stop|restart|status"
}

if [ "$1" == "" ]; then
    help
elif [ "$1" == "stop" ];then
    stop
elif [ "$1" == "start" ];then
    start
elif [ "$1" == "restart" ];then
    restart
elif [ "$1" == "status" ];then
    status
else
    help
fi