#!/bin/bash

#before was _LOGFILE: check why
# This can be overridden via config.json
LOGFILE="/var/log/ets.log"

C_OK="\E[1;42m OK \033[0m"
C_KO="\E[1;41m KO \033[0m"

function usage() {
  echo "Usage: $(basename $0) [install|update|start|stop|restart|status|test|log]"
  exit 1
}

function check_logdir() {
  [ ! -w $(dirname ${LOGFILE}) ] && { return 1; } || { return 0; }
}

function check_config() {
  node chk_config 2> /dev/null
  return $?
}

function check_stash() {
  node chk_stash 2> /dev/null
  return $?
}

function check_node() {
  return 0
}

function stop() {

  # getting processes pid from the port they are running on
  ehs="$(fuser -n tcp 6701 2>/dev/null)"
  mhs="$(fuser -n tcp 6721 2>/dev/null)"

  if [ "$ehs" == "" ] && [ "$mhs" == "" ]; then
    echo "Server is already stopped (no process available on ports)."
  else
    echo "Stopping server..."
    kill $ehs
    kill $mhs
    echo "Attention: If server was started at system boot, will be respawned after stopping it."
  fi

  #if [ ! -f /tmp/ets.pid ]; then
  #  echo "Server is already stopped (no pid file)."
  #else
  #  echo "Stopping server..."
  #  kill $(cat /tmp/ets.pid)
  #  rm -f /tmp/ets.pid
  #fi

}

function start() {
  
  echo "Starting..."

  check_node

  if [ $? != 0 ]; then
    echo "You're running a wrong version of node, you're using $NODE_VERSION, we need at least v0.6.0" >&2
    exit 1
  fi

  check_stash

  if [ $? != 0 ]; then
    echo "There is a problem accessing the stash server (file or redis). An error in config.json, maybe? Redis server not started?"
    exit 1
  fi

  check_logdir

  if [ $? != 0 ]; then
    echo "$(dirname ${LOGFILE}) is not writable"
    exit 1
  fi

  check_config

  if [ $? != 0 ]; then
    echo "Syntax error on config.json. Cannot continue."
    exit 1
  fi

  node server >> ${LOGFILE} 2>>${LOGFILE} & 
  # This script is aimed to be used in a development environment, so use a "easy" dir
  #echo ps -ef | pgrep -f "node server" > /tmp/ets.pid # collecting the pid in this way seems not to work anymore so i get the pid with fuser, knowing its port
}

cd `dirname $0`

if [ -d "../bin" ]; then
  cd "../"
fi

if [ "${1}" != "update" ] && [ "${1}" != "test" ] && [ "${1}" != "restart" ] && [ "${1}" != "log" ] && [ "${1}" != "status" ] && [ "${1}" != "start" ] && [ "${1}" != "stop" ] && [ "${1}" != "install" ]; then
  usage
fi

#if [ "$(id -u)" -eq 0 ]; then
#  echo "You shouldn't use this tool as root!"
#  exit 1
#fi

# Is node installed?
hash node > /dev/null 2>&1 || {
  echo "Please install node.js ( http://nodejs.org )" >&2
  exit 1
}

#if [ "${1}" != "install" ]; then
 # LOGFILE=$(cat conf/config.json | grep -Po '"append_to"\s*:.*' | sed -n  's/.*:\s*"\(.*\)".*/\1/p')
 # [ "${LOGFILE}" = "" ] && LOGFILE=${_LOGFILE}
 #LOGFILE=./ets.log
#fi

# Is npm installed?
hash npm > /dev/null 2>&1 || {
  echo "Please install npm ( http://npmjs.org )" >&2
  exit 1
}

# Check npm version
#NPM_VERSION=$(npm --version)
#if [ ! $(echo $NPM_VERSION | cut -d "." -f 1-2) = "1.0" ]; then
#  echo "You're running a wrong version of npm, you're using $NPM_VERSION, we need 1.0.x" >&2
#  exit 1
#fi

# Check if the system is correctly installed
# Betta: this is commented for the new install procedure doesn't create this file .install in the ets directory
#if [ "${1}" != "install" ] && [ ! -f .install ]; then
#  echo The system is not correctly installed 1
#  echo Please run $(basename $0) install
#  exit 1
#fi

if [ "${1}" != "install" ] && [ ! -f "conf/config.json" ]; then
  echo The config file is missing
  echo The system is not correctly installed 2
  echo Please run $(basename $0) install
  exit 1
fi

##
# START / STOP
##
if [ "${1}" = "start" ] || [ "${1}" = "stop" ] || [ "${1}" = "restart" ]; then

  cd node

  if [ "${1}" = "start" ]; then
    start
  fi

  if [ "${1}" == "stop" ]; then
    stop
  fi

  if [ "${1}" == "restart" ]; then
    stop
    sleep 2
    start
  fi

fi

##
# UPDATE
##
if [ "${1}" = "update" ]; then
  cd node
#  echo "Updating npm..."
#  curl -s http://npmjs.org/install.sh | sudo sh
  echo "Updating node modules. This might take a while..."
  npm update
fi

##
# TEST
##
if [ "${1}" = "test" ]; then
  cd node
  echo -n "Test if log directory is writable: $(dirname ${LOGFILE}) "
  check_logdir
  [ $? != 0 ] && { echo -e [${C_KO}]; } || { echo -e [${C_OK}]; }
  echo -n "Test if config is correct "
  check_config
  [ $? != 0 ]  && { echo -e [${C_KO}]; } || { echo -e [${C_OK}]; }
  echo -n "Test if the stash is accessible "
  check_stash
  [ $? != 0 ]  && { echo -e [${C_KO}]; } || { echo -e [${C_OK}]; }
fi

##
# LOG
##
if [ "${1}" = "log" ]; then
  echo Reading ${LOGFILE}
  tail -f -n 100 -f ${LOGFILE}
fi

##
# STATUS
##
if [ "${1}" = "status" ]; then
  echo "Showing node.js processes. You should see at least 'node server', 'node ehs' and 'node mhs'"
  ps o args= -p $(ps axo pid,command,args | grep -i "node" | grep -v grep | awk '{ print $1 }') 2> /dev/null
fi

##
# INSTALLER
##
if [ "${1}" = "install" ]; then

  check_node 

  if [ $? != 0 ]; then
    echo "You're running a wrong version of node, you're using $NODE_VERSION, we need at least v0.6.0" >&2
    exit 1
  fi

  rm -f .install

  if [ ! -f "conf/config.json" ]; then
    echo "Creating the settings file config.json..."
    cp -v conf/config.json.template conf/config.json || exit 1
    echo ==============================================================
    echo "You now have to edit config.json and supply the correct values"
    echo "Once the editing will be finished, the install process will continue"
    echo "If you prefer you can always edit the file with you editor of choice"
    echo "once the install process is ended"
    echo
    echo "Remember that whenever you'll have to modify the config.json file"
    echo "you will then need to restart the whole server for the changes to"
    echo "take effect"
    echo
    echo "Press a key to start editing"
    echo ==============================================================
    read x
    vi conf/config.json
  fi

  cd node

  echo Installing node.js modules. This may take a while...

  npm install

  if [ $? != 0 ]; then
    echo Sorry, something went wrong during the module installation. Installation NOT completed.
    exit 1
  fi

  touch ../.install

  echo
  echo Success!
  echo The system appears to be correctly installed.

fi