#!/bin/bash
#
# This file is used to install database on linux systems. The operating system
# is required to use systemd to manage services at boot

set -e
#set -x

verMode=edge
pagMode=full

iplist=""
serverFqdn=""
# -----------------------Variables definition---------------------
script_dir=$(dirname $(readlink -f "$0"))
# Dynamic directory
data_dir="/var/lib/power"
log_dir="/var/log/power"

data_link_dir="/usr/local/power/data"
log_link_dir="/usr/local/power/log"

cfg_install_dir="/etc/power"

bin_link_dir="/usr/bin"
lib_link_dir="/usr/lib"
lib64_link_dir="/usr/lib64"
inc_link_dir="/usr/include"

#install main path
install_main_dir="/usr/local/power"

# old bin dir
bin_dir="/usr/local/power/bin"

# v1.5 jar dir
#v15_java_app_dir="/usr/local/lib/power"

service_config_dir="/etc/systemd/system"
nginx_port=6060
nginx_dir="/usr/local/nginxd"

# Color setting
RED='\033[0;31m'
GREEN='\033[1;32m'
GREEN_DARK='\033[0;32m'
GREEN_UNDERLINE='\033[4;32m'
NC='\033[0m'

csudo=""
if command -v sudo > /dev/null; then
    csudo="sudo"
fi

update_flag=0

initd_mod=0
service_mod=2
if pidof systemd &> /dev/null; then
    service_mod=0
elif $(which service &> /dev/null); then    
    service_mod=1
    service_config_dir="/etc/init.d" 
    if $(which chkconfig &> /dev/null); then
         initd_mod=1 
    elif $(which insserv &> /dev/null); then
        initd_mod=2
    elif $(which update-rc.d &> /dev/null); then
        initd_mod=3
    else
        service_mod=2
    fi
else 
    service_mod=2
fi


# get the operating system type for using the corresponding init file
# ubuntu/debian(deb), centos/fedora(rpm), others: opensuse, redhat, ..., no verification
#osinfo=$(awk -F= '/^NAME/{print $2}' /etc/os-release)
if [[ -e /etc/os-release ]]; then
  osinfo=$(cat /etc/os-release | grep "NAME" | cut -d '"' -f2)   ||:
else
  osinfo=""
fi
#echo "osinfo: ${osinfo}"
os_type=0
if echo $osinfo | grep -qwi "ubuntu" ; then
#  echo "This is ubuntu system"
  os_type=1
elif echo $osinfo | grep -qwi "debian" ; then
#  echo "This is debian system"
  os_type=1
elif echo $osinfo | grep -qwi "Kylin" ; then
#  echo "This is Kylin system"
  os_type=1
elif  echo $osinfo | grep -qwi "centos" ; then
#  echo "This is centos system"
  os_type=2
elif echo $osinfo | grep -qwi "fedora" ; then
#  echo "This is fedora system"
  os_type=2
else
  echo " osinfo: ${osinfo}"
  echo " This is an officially unverified linux system," 
  echo " if there are any problems with the installation and operation, "
  echo " please feel free to contact taosdata.com for support."
  os_type=1
fi


# =============================  get input parameters =================================================

# install.sh -v [server | client]  -e [yes | no] -i [systemd | service | ...]

# set parameters by default value
interactiveFqdn=yes   # [yes | no]
verType=server        # [server | client]
initType=systemd      # [systemd | service | ...]

while getopts "hv:e:i:" arg
do
  case $arg in
    e)
      #echo "interactiveFqdn=$OPTARG"
      interactiveFqdn=$( echo $OPTARG )
      ;;
    v)
      #echo "verType=$OPTARG"
      verType=$(echo $OPTARG)
      ;;
    i)
      #echo "initType=$OPTARG"
      initType=$(echo $OPTARG)
      ;;
    h)
      echo "Usage: `basename $0` -v [server | client]  -e [yes | no]"
      exit 0
      ;;
    ?) #unknow option 
      echo "unkonw argument"
      exit 1
      ;;
  esac
done

#echo "verType=${verType} interactiveFqdn=${interactiveFqdn}"

function kill_process() {
  pid=$(ps -ef | grep "$1" | grep -v "grep" | awk '{print $2}')
  if [ -n "$pid" ]; then
    ${csudo} kill -9 $pid   || :
  fi
}

function install_main_path() {
    #create install main dir and all sub dir
    ${csudo} rm -rf ${install_main_dir}    || :
    ${csudo} mkdir -p ${install_main_dir}  
    ${csudo} mkdir -p ${install_main_dir}/cfg
    ${csudo} mkdir -p ${install_main_dir}/bin    
    ${csudo} mkdir -p ${install_main_dir}/connector
    ${csudo} mkdir -p ${install_main_dir}/driver
    ${csudo} mkdir -p ${install_main_dir}/examples
    ${csudo} mkdir -p ${install_main_dir}/include
    ${csudo} mkdir -p ${install_main_dir}/init.d
    if [ "$verMode" == "cluster" ]; then
        ${csudo} mkdir -p ${nginx_dir}
    fi
}

function install_bin() {
    # Remove links
    ${csudo} rm -f ${bin_link_dir}/power     || :
    ${csudo} rm -f ${bin_link_dir}/powerd    || :
    ${csudo} rm -f ${bin_link_dir}/powerdemo || :
    ${csudo} rm -f ${bin_link_dir}/rmpower   || :
    ${csudo} rm -f ${bin_link_dir}/tarbitrator   || :
    ${csudo} rm -f ${bin_link_dir}/set_core   || :

    ${csudo} cp -r ${script_dir}/bin/* ${install_main_dir}/bin && ${csudo} chmod 0555 ${install_main_dir}/bin/*

    #Make link
    [ -x ${install_main_dir}/bin/power ] && ${csudo} ln -s ${install_main_dir}/bin/power ${bin_link_dir}/power                        || :
    [ -x ${install_main_dir}/bin/powerd ] && ${csudo} ln -s ${install_main_dir}/bin/powerd ${bin_link_dir}/powerd                     || :
    [ -x ${install_main_dir}/bin/powerdemo ] && ${csudo} ln -s ${install_main_dir}/bin/powerdemo ${bin_link_dir}/powerdemo            || :
    [ -x ${install_main_dir}/bin/remove_power.sh ] && ${csudo} ln -s ${install_main_dir}/bin/remove_power.sh ${bin_link_dir}/rmpower  || :
    [ -x ${install_main_dir}/bin/set_core.sh ] && ${csudo} ln -s ${install_main_dir}/bin/set_core.sh ${bin_link_dir}/set_core         || :
    [ -x ${install_main_dir}/bin/tarbitrator ] && ${csudo} ln -s ${install_main_dir}/bin/tarbitrator ${bin_link_dir}/tarbitrator      || :

    if [ "$verMode" == "cluster" ]; then
        ${csudo} cp -r ${script_dir}/nginxd/* ${nginx_dir} && ${csudo} chmod 0555 ${nginx_dir}/*
        ${csudo} mkdir -p ${nginx_dir}/logs
        ${csudo} chmod 777 ${nginx_dir}/sbin/nginx
    fi
}

function install_lib() {
    # Remove links
    ${csudo} rm -f ${lib_link_dir}/libtaos.*         || :
    ${csudo} rm -f ${lib64_link_dir}/libtaos.*       || :
    #${csudo} rm -rf ${v15_java_app_dir}              || :
    ${csudo} cp -rf ${script_dir}/driver/* ${install_main_dir}/driver && ${csudo} chmod 777 ${install_main_dir}/driver/*  
    
    ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib_link_dir}/libtaos.so.1
    ${csudo} ln -s ${lib_link_dir}/libtaos.so.1 ${lib_link_dir}/libtaos.so
    
    if [[ -d ${lib64_link_dir} && ! -e ${lib64_link_dir}/libtaos.so ]]; then
      ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib64_link_dir}/libtaos.so.1       || :
      ${csudo} ln -s ${lib64_link_dir}/libtaos.so.1 ${lib64_link_dir}/libtaos.so               || :
    fi
        
	  #if [ "$verMode" == "cluster" ]; then
    #    # Compatible with version 1.5
    #    ${csudo} mkdir -p ${v15_java_app_dir}
    #    ${csudo} ln -s ${install_main_dir}/connector/taos-jdbcdriver-1.0.2-dist.jar ${v15_java_app_dir}/JDBCDriver-1.0.2-dist.jar
    #    ${csudo} chmod 777 ${v15_java_app_dir} || :
    #fi
    
    ${csudo} ldconfig
}

function install_header() {
    ${csudo} rm -f ${inc_link_dir}/taos.h ${inc_link_dir}/taoserror.h    || :
    ${csudo} cp -f ${script_dir}/inc/* ${install_main_dir}/include && ${csudo} chmod 644 ${install_main_dir}/include/*    
    ${csudo} ln -s ${install_main_dir}/include/taos.h ${inc_link_dir}/taos.h
    ${csudo} ln -s ${install_main_dir}/include/taoserror.h ${inc_link_dir}/taoserror.h
}

function add_newHostname_to_hosts() {
  localIp="127.0.0.1"
  OLD_IFS="$IFS"
  IFS=" "
  iphost=$(cat /etc/hosts | grep $1 | awk '{print $1}')
  arr=($iphost)
  IFS="$OLD_IFS"
  for s in ${arr[@]}
  do
    if [[ "$s" == "$localIp" ]]; then
      return
    fi
  done 
  ${csudo} echo "127.0.0.1  $1" >> /etc/hosts   ||:
}

function set_hostname() {
  echo -e -n "${GREEN}Please enter one hostname(must not be 'localhost')${NC}:"
	read newHostname
  while true; do
    if [[ ! -z "$newHostname" && "$newHostname" != "localhost" ]]; then
      break
    else
      read -p "Please enter one hostname(must not be 'localhost'):" newHostname
    fi
  done

  ${csudo} hostname $newHostname ||:
  retval=`echo $?`
  if [[ $retval != 0 ]]; then
   echo
   echo "set hostname fail!"
   return 
  fi
  #echo -e -n "$(hostnamectl status --static)"
  #echo -e -n "$(hostnamectl status --transient)"
  #echo -e -n "$(hostnamectl status --pretty)"
  
  #ubuntu/centos /etc/hostname
  if [[ -e /etc/hostname ]]; then
    ${csudo} echo $newHostname > /etc/hostname   ||:
  fi
  
  #debian: #HOSTNAME=yourname
  if [[ -e /etc/sysconfig/network ]]; then
    ${csudo} sed -i -r "s/#*\s*(HOSTNAME=\s*).*/\1$newHostname/" /etc/sysconfig/network   ||:
  fi

  ${csudo} sed -i -r "s/#*\s*(fqdn\s*).*/\1$newHostname/" ${cfg_install_dir}/taos.cfg
  serverFqdn=$newHostname  
  
  if [[ -e /etc/hosts ]]; then
    add_newHostname_to_hosts $newHostname
  fi
}

function is_correct_ipaddr() {
  newIp=$1
  OLD_IFS="$IFS"
  IFS=" "
  arr=($iplist)
  IFS="$OLD_IFS"
  for s in ${arr[@]}
  do
   if [[ "$s" == "$newIp" ]]; then
     return 0
   fi
  done
  
  return 1
}

function set_ipAsFqdn() {
  iplist=$(ip address |grep inet |grep -v inet6 |grep -v 127.0.0.1 |awk '{print $2}' |awk -F "/" '{print $1}') ||:
  if [ -z "$iplist" ]; then
    iplist=$(ifconfig |grep inet |grep -v inet6 |grep -v 127.0.0.1 |awk '{print $2}' |awk -F ":" '{print $2}') ||:
  fi

  if [ -z "$iplist" ]; then
    echo
    echo -e -n "${GREEN}Unable to get local ip, use 127.0.0.1${NC}"
    localFqdn="127.0.0.1"
    # Write the local FQDN to configuration file                    
    ${csudo} sed -i -r "s/#*\s*(fqdn\s*).*/\1$localFqdn/" ${cfg_install_dir}/taos.cfg    
    serverFqdn=$localFqdn
    echo
    return
  fi  
  
  echo -e -n "${GREEN}Please choose an IP from local IP list${NC}:"
  echo
  echo -e -n "${GREEN}$iplist${NC}"
  echo
  echo
  echo -e -n "${GREEN}Notes: if IP is used as the node name, data can NOT be migrated to other machine directly${NC}:"
  read localFqdn
    while true; do
      if [ ! -z "$localFqdn" ]; then            
        # Check if correct ip address
        is_correct_ipaddr $localFqdn
        retval=`echo $?`
        if [[ $retval != 0 ]]; then
          read -p "Please choose an IP from local IP list:" localFqdn
        else
          # Write the local FQDN to configuration file                    
          ${csudo} sed -i -r "s/#*\s*(fqdn\s*).*/\1$localFqdn/" ${cfg_install_dir}/taos.cfg    
          serverFqdn=$localFqdn
          break
        fi
      else
        read -p "Please choose an IP from local IP list:" localFqdn
      fi
    done
}

function local_fqdn_check() {
  #serverFqdn=$(hostname)
  echo
  echo -e -n "System hostname is: ${GREEN}$serverFqdn${NC}"
  echo
  if [[ "$serverFqdn" == "" ]] || [[ "$serverFqdn" == "localhost"  ]]; then    
    echo -e -n "${GREEN}It is strongly recommended to configure a hostname for this machine ${NC}"
    echo
    
    while true
    do
	    read -r -p "Set hostname now? [Y/n] " input
	    if [ ! -n "$input" ]; then
       set_hostname
       break
      else
	      case $input in
	        [yY][eE][sS]|[yY])
          set_hostname
          break
			    ;;
        
	        [nN][oO]|[nN])
			    set_ipAsFqdn
			    break   	
			    ;;
        
	        *)
			    echo "Invalid input..."
			    ;;
	      esac
	    fi
    done
  fi
}

function install_config() {
    #${csudo} rm -f ${install_main_dir}/cfg/taos.cfg     || :
    
    if [ ! -f ${cfg_install_dir}/taos.cfg ]; then
        ${csudo} mkdir -p ${cfg_install_dir}
        [ -f ${script_dir}/cfg/taos.cfg ] && ${csudo} cp ${script_dir}/cfg/taos.cfg ${cfg_install_dir}
        ${csudo} chmod 644 ${cfg_install_dir}/*
    fi 
    
    ${csudo} cp -f ${script_dir}/cfg/taos.cfg ${install_main_dir}/cfg/taos.cfg.org
    ${csudo} ln -s ${cfg_install_dir}/taos.cfg ${install_main_dir}/cfg

    [ ! -z $1 ] && return 0 || : # only install client
    
    if ((${update_flag}==1)); then
        return 0
    fi
    
    if [ "$interactiveFqdn" == "no" ]; then
        return 0
    fi
    
    local_fqdn_check

    #FQDN_FORMAT="(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"
    #FQDN_FORMAT="(:[1-6][0-9][0-9][0-9][0-9]$)"
    #PORT_FORMAT="(/[1-6][0-9][0-9][0-9][0-9]?/)"
    #FQDN_PATTERN=":[0-9]{1,5}$"

    # first full-qualified domain name (FQDN) for PowerDB cluster system
    echo
    echo -e -n "${GREEN}Enter FQDN:port (like h1.powerdata.com:6030) of an existing PowerDB cluster node to join${NC}"
    echo
    echo -e -n "${GREEN}OR leave it blank to build one${NC}:"
    read firstEp
    while true; do
        if [ ! -z "$firstEp" ]; then
            # check the format of the firstEp
            #if [[ $firstEp == $FQDN_PATTERN ]]; then
                # Write the first FQDN to configuration file                    
                ${csudo} sed -i -r "s/#*\s*(firstEp\s*).*/\1$firstEp/" ${cfg_install_dir}/taos.cfg    
                break
            #else
            #    read -p "Please enter the correct FQDN:port: " firstEp
            #fi
        else
            break
        fi
    done	
}


function install_log() {
    ${csudo} rm -rf ${log_dir}  || :
    ${csudo} mkdir -p ${log_dir} && ${csudo} chmod 777 ${log_dir}
    
    ${csudo} ln -s ${log_dir} ${install_main_dir}/log
}

function install_data() {
    ${csudo} mkdir -p ${data_dir}
    
    ${csudo} ln -s ${data_dir} ${install_main_dir}/data    
}

function install_connector() {
    ${csudo} cp -rf ${script_dir}/connector/* ${install_main_dir}/connector
}

function install_examples() {
    if [ -d ${script_dir}/examples ]; then
        ${csudo} cp -rf ${script_dir}/examples/* ${install_main_dir}/examples
    fi
}

function clean_service_on_sysvinit() {
    #restart_config_str="power:2345:respawn:${service_config_dir}/powerd start"
    #${csudo} sed -i "\|${restart_config_str}|d" /etc/inittab || :    
    
    if pidof powerd &> /dev/null; then
        ${csudo} service powerd stop || :
    fi
    
    if pidof tarbitrator &> /dev/null; then
        ${csudo} service tarbitratord stop || :
    fi

    if ((${initd_mod}==1)); then
      if [ -e ${service_config_dir}/powerd ]; then 
        ${csudo} chkconfig --del powerd || :
      fi

      if [ -e ${service_config_dir}/tarbitratord ]; then 
        ${csudo} chkconfig --del tarbitratord || :
      fi
    elif ((${initd_mod}==2)); then
      if [ -e ${service_config_dir}/powerd ]; then 
        ${csudo} insserv -r powerd || :
      fi
      if [ -e ${service_config_dir}/tarbitratord ]; then
        ${csudo} insserv -r tarbitratord || :
      fi
    elif ((${initd_mod}==3)); then
      if [ -e ${service_config_dir}/powerd ]; then
        ${csudo} update-rc.d -f powerd remove || :
      fi
      if [ -e ${service_config_dir}/tarbitratord ]; then
        ${csudo} update-rc.d -f tarbitratord remove || :
      fi
    fi
    
    ${csudo} rm -f ${service_config_dir}/powerd || :
    ${csudo} rm -f ${service_config_dir}/tarbitratord || :
    
    if $(which init &> /dev/null); then
        ${csudo} init q || :
    fi
}

function install_service_on_sysvinit() {
    clean_service_on_sysvinit
    sleep 1

    # Install powerd service

    if ((${os_type}==1)); then
        ${csudo} cp -f ${script_dir}/init.d/powerd.deb ${install_main_dir}/init.d/powerd
        ${csudo} cp    ${script_dir}/init.d/powerd.deb ${service_config_dir}/powerd && ${csudo} chmod a+x ${service_config_dir}/powerd
        ${csudo} cp -f ${script_dir}/init.d/tarbitratord.deb ${install_main_dir}/init.d/tarbitratord
        ${csudo} cp    ${script_dir}/init.d/tarbitratord.deb ${service_config_dir}/tarbitratord && ${csudo} chmod a+x ${service_config_dir}/tarbitratord
    elif ((${os_type}==2)); then
        ${csudo} cp -f ${script_dir}/init.d/powerd.rpm ${install_main_dir}/init.d/powerd
        ${csudo} cp    ${script_dir}/init.d/powerd.rpm ${service_config_dir}/powerd && ${csudo} chmod a+x ${service_config_dir}/powerd
        ${csudo} cp -f ${script_dir}/init.d/tarbitratord.rpm ${install_main_dir}/init.d/tarbitratord
        ${csudo} cp    ${script_dir}/init.d/tarbitratord.rpm ${service_config_dir}/tarbitratord && ${csudo} chmod a+x ${service_config_dir}/tarbitratord
    fi
    
    #restart_config_str="power:2345:respawn:${service_config_dir}/powerd start"
    #${csudo} grep -q -F "$restart_config_str" /etc/inittab || ${csudo} bash -c "echo '${restart_config_str}' >> /etc/inittab"
    
    if ((${initd_mod}==1)); then
        ${csudo} chkconfig --add powerd || :
        ${csudo} chkconfig --level 2345 powerd on || :
        ${csudo} chkconfig --add tarbitratord || :
        ${csudo} chkconfig --level 2345 tarbitratord on || :
    elif ((${initd_mod}==2)); then
        ${csudo} insserv powerd || :
        ${csudo} insserv -d powerd || :
        ${csudo} insserv tarbitratord || :
        ${csudo} insserv -d tarbitratord || :
    elif ((${initd_mod}==3)); then
        ${csudo} update-rc.d powerd defaults || :
        ${csudo} update-rc.d tarbitratord defaults || :
    fi
}

function clean_service_on_systemd() {
    powerd_service_config="${service_config_dir}/powerd.service"
    if systemctl is-active --quiet powerd; then
        echo "PowerDB is running, stopping it..."
        ${csudo} systemctl stop powerd &> /dev/null || echo &> /dev/null
    fi
    ${csudo} systemctl disable powerd &> /dev/null || echo &> /dev/null
    ${csudo} rm -f ${powerd_service_config}
    
    tarbitratord_service_config="${service_config_dir}/tarbitratord.service"
    if systemctl is-active --quiet tarbitratord; then
        echo "tarbitrator is running, stopping it..."
        ${csudo} systemctl stop tarbitratord &> /dev/null || echo &> /dev/null
    fi
    ${csudo} systemctl disable tarbitratord &> /dev/null || echo &> /dev/null
    ${csudo} rm -f ${tarbitratord_service_config}
        
    if [ "$verMode" == "cluster" ]; then
      nginx_service_config="${service_config_dir}/nginxd.service"
      if systemctl is-active --quiet nginxd; then
        echo "Nginx for TDengine is running, stopping it..."
        ${csudo} systemctl stop nginxd &> /dev/null || echo &> /dev/null
      fi
      ${csudo} systemctl disable nginxd &> /dev/null || echo &> /dev/null
      ${csudo} rm -f ${nginx_service_config}              
	  fi
}

# power:2345:respawn:/etc/init.d/powerd start

function install_service_on_systemd() {
    clean_service_on_systemd

    powerd_service_config="${service_config_dir}/powerd.service"
    ${csudo} bash -c "echo '[Unit]'                              >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'Description=PowerDB server service'  >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'After=network-online.target'         >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'Wants=network-online.target'         >> ${powerd_service_config}"
    ${csudo} bash -c "echo                                       >> ${powerd_service_config}"
    ${csudo} bash -c "echo '[Service]'                           >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'Type=simple'                         >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'ExecStart=/usr/bin/powerd'           >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'ExecStartPre=/usr/local/power/bin/startPre.sh'           >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'LimitNOFILE=infinity'                >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'LimitNPROC=infinity'                 >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'LimitCORE=infinity'                  >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'TimeoutStartSec=0'                   >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'StandardOutput=null'                 >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'Restart=always'                      >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'StartLimitBurst=3'                   >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'StartLimitInterval=60s'              >> ${powerd_service_config}"
    ${csudo} bash -c "echo                                       >> ${powerd_service_config}"
    ${csudo} bash -c "echo '[Install]'                           >> ${powerd_service_config}"
    ${csudo} bash -c "echo 'WantedBy=multi-user.target'          >> ${powerd_service_config}"
    ${csudo} systemctl enable powerd
    
    tarbitratord_service_config="${service_config_dir}/tarbitratord.service"
    ${csudo} bash -c "echo '[Unit]'                                  >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'Description=TDengine arbitrator service' >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'After=network-online.target'             >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'Wants=network-online.target'             >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo                                           >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo '[Service]'                               >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'Type=simple'                             >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'ExecStart=/usr/bin/tarbitrator'          >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'LimitNOFILE=infinity'                    >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'LimitNPROC=infinity'                     >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'LimitCORE=infinity'                      >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'TimeoutStartSec=0'                       >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'StandardOutput=null'                     >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'Restart=always'                          >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'StartLimitBurst=3'                       >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'StartLimitInterval=60s'                  >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo                                           >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo '[Install]'                               >> ${tarbitratord_service_config}"
    ${csudo} bash -c "echo 'WantedBy=multi-user.target'              >> ${tarbitratord_service_config}"
    #${csudo} systemctl enable tarbitratord  
        
    if [ "$verMode" == "cluster" ]; then		
        nginx_service_config="${service_config_dir}/nginxd.service"
        ${csudo} bash -c "echo '[Unit]'                                             >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'Description=Nginx For PowrDB Service'               >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'After=network-online.target'                        >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'Wants=network-online.target'                        >> ${nginx_service_config}"
        ${csudo} bash -c "echo                                                      >> ${nginx_service_config}"
        ${csudo} bash -c "echo '[Service]'                                          >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'Type=forking'                                       >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'PIDFile=/usr/local/nginxd/logs/nginx.pid'           >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'ExecStart=/usr/local/nginxd/sbin/nginx'             >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'ExecStop=/usr/local/nginxd/sbin/nginx -s stop'      >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'LimitNOFILE=infinity'                               >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'LimitNPROC=infinity'                                >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'LimitCORE=infinity'                                 >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'TimeoutStartSec=0'                                  >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'StandardOutput=null'                                >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'Restart=always'                                     >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'StartLimitBurst=3'                                  >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'StartLimitInterval=60s'                             >> ${nginx_service_config}"
        ${csudo} bash -c "echo                                                      >> ${nginx_service_config}"
        ${csudo} bash -c "echo '[Install]'                                          >> ${nginx_service_config}"
        ${csudo} bash -c "echo 'WantedBy=multi-user.target'                         >> ${nginx_service_config}"
        if ! ${csudo} systemctl enable nginxd &> /dev/null; then
            ${csudo} systemctl daemon-reexec
            ${csudo} systemctl enable nginxd
        fi
        ${csudo} systemctl start nginxd
	fi
}

function install_service() {
    if ((${service_mod}==0)); then
        install_service_on_systemd
    elif ((${service_mod}==1)); then
        install_service_on_sysvinit
    else
        # must manual stop powerd
        kill_process powerd
    fi
}

vercomp () {
    if [[ $1 == $2 ]]; then
        return 0
    fi
    local IFS=.
    local i ver1=($1) ver2=($2)
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++)); do
        ver1[i]=0
    done

    for ((i=0; i<${#ver1[@]}; i++)); do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

function is_version_compatible() {

    curr_version=$(${bin_dir}/powerd -V | head -1 | cut -d ' ' -f 3)

    min_compatible_version=$(${script_dir}/bin/powerd -V | head -1 | cut -d ' ' -f 5)

    vercomp $curr_version $min_compatible_version
    case $? in
        0) return 0;;
        1) return 0;;
        2) return 1;;
    esac
}

function update_PowerDB() {
    # Start to update
    if [ ! -e power.tar.gz ]; then
        echo "File power.tar.gz does not exist"
        exit 1
    fi
    tar -zxf power.tar.gz

    # Check if version compatible
    if ! is_version_compatible; then
        echo -e "${RED}Version incompatible${NC}"
        return 1
    fi

    echo -e "${GREEN}Start to update PowerDB...${NC}"
    # Stop the service if running
    if pidof powerd &> /dev/null; then
        if ((${service_mod}==0)); then
            ${csudo} systemctl stop powerd || :
        elif ((${service_mod}==1)); then
            ${csudo} service powerd stop || :
        else
            kill_process powerd
        fi
        sleep 1
    fi    
    if [ "$verMode" == "cluster" ]; then 
      if pidof nginx &> /dev/null; then
        if ((${service_mod}==0)); then
            ${csudo} systemctl stop nginxd || :
        elif ((${service_mod}==1)); then
            ${csudo} service nginxd stop || :
        else
            kill_process nginx
        fi
        sleep 1
      fi
    fi
    
    install_main_path

    install_log
    install_header
    install_lib
    if [ "$pagMode" != "lite" ]; then
      install_connector
    fi
    install_examples
    if [ -z $1 ]; then
        install_bin
        install_service
        install_config		
		
        openresty_work=false
		    if [ "$verMode" == "cluster" ]; then    
            # Check if openresty is installed
            # Check if nginx is installed successfully
            if type curl &> /dev/null; then
                if curl -sSf http://127.0.0.1:${nginx_port} &> /dev/null; then
                    echo -e "\033[44;32;1mNginx for PowerDB is updated successfully!${NC}"
                    openresty_work=true
                else
                    echo -e "\033[44;31;5mNginx for PowerDB does not work! Please try again!\033[0m"
                fi
            fi
		    fi 

        #echo
        #echo -e "\033[44;32;1mPowerDB is updated successfully!${NC}"
        echo
        echo -e "${GREEN_DARK}To configure PowerDB ${NC}: edit /etc/power/taos.cfg"
        if ((${service_mod}==0)); then
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: ${csudo} systemctl start powerd${NC}"
        elif ((${service_mod}==1)); then
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: ${csudo} service powerd start${NC}"
        else
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: ./powerd${NC}"
        fi

        if [ ${openresty_work} = 'true' ]; then
            echo -e "${GREEN_DARK}To access PowerDB    ${NC}: use ${GREEN_UNDERLINE}power -h $serverFqdn${NC} in shell OR from ${GREEN_UNDERLINE}http://127.0.0.1:${nginx_port}${NC}"
        else
            echo -e "${GREEN_DARK}To access PowerDB    ${NC}: use ${GREEN_UNDERLINE}power -h $serverFqdn${NC} in shell${NC}"
        fi
                
        echo
        echo -e "\033[44;32;1mPowerDB is updated successfully!${NC}"
    else
        install_bin
        install_config

        echo
        echo -e "\033[44;32;1mPowerDB client is updated successfully!${NC}"
    fi

    rm -rf $(tar -tf power.tar.gz)
}

function install_PowerDB() {
    # Start to install
    if [ ! -e power.tar.gz ]; then
        echo "File power.tar.gz does not exist"
        exit 1
    fi
    tar -zxf power.tar.gz

    echo -e "${GREEN}Start to install PowerDB...${NC}"
    
	  install_main_path
	   
    if [ -z $1 ]; then
        install_data
    fi 
    
    install_log 
    install_header
    install_lib
    if [ "$pagMode" != "lite" ]; then
      install_connector
    fi
    install_examples

    if [ -z $1 ]; then # install service and client
        # For installing new
        install_bin
        install_service

        openresty_work=false
        if [ "$verMode" == "cluster" ]; then
            # Check if nginx is installed successfully
            if type curl &> /dev/null; then
                if curl -sSf http://127.0.0.1:${nginx_port} &> /dev/null; then
                    echo -e "\033[44;32;1mNginx for PowerDB is installed successfully!${NC}"
                    openresty_work=true
                else
                    echo -e "\033[44;31;5mNginx for PowerDB does not work! Please try again!\033[0m"
                fi
            fi
        fi
		
        install_config	

        # Ask if to start the service
        #echo
        #echo -e "\033[44;32;1mPowerDB is installed successfully!${NC}"
        echo
        echo -e "${GREEN_DARK}To configure PowerDB ${NC}: edit /etc/power/taos.cfg"
        if ((${service_mod}==0)); then
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: ${csudo} systemctl start powerd${NC}"
        elif ((${service_mod}==1)); then
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: ${csudo} service powerd start${NC}"
        else
            echo -e "${GREEN_DARK}To start PowerDB     ${NC}: powerd${NC}"
        fi		

        #if [ ${openresty_work} = 'true' ]; then
        #     echo -e "${GREEN_DARK}To access PowerDB    ${NC}: use ${GREEN_UNDERLINE}power${NC} in shell OR from ${GREEN_UNDERLINE}http://127.0.0.1:${nginx_port}${NC}"
        #else
        #     echo -e "${GREEN_DARK}To access PowerDB    ${NC}: use ${GREEN_UNDERLINE}power${NC} in shell${NC}"
        #fi
		
        if [ ! -z "$firstEp" ]; then
          tmpFqdn=${firstEp%%:*}
          substr=":"
          if [[ $firstEp =~ $substr ]];then
            tmpPort=${firstEp#*:}
          else
            tmpPort=""
          fi
          if [[ "$tmpPort" != "" ]];then
	          echo -e "${GREEN_DARK}To access PowerDB    ${NC}: power -h $tmpFqdn -P $tmpPort${GREEN_DARK} to login into cluster, then${NC}"
	        else
	          echo -e "${GREEN_DARK}To access PowerDB    ${NC}: power -h $tmpFqdn${GREEN_DARK} to login into cluster, then${NC}"
	        fi
	        echo -e "${GREEN_DARK}execute ${NC}: create dnode 'newDnodeFQDN:port'; ${GREEN_DARK}to add this new node${NC}"
          echo
        elif [ ! -z "$serverFqdn" ]; then
	        echo -e "${GREEN_DARK}To access PowerDB    ${NC}: power -h $serverFqdn${GREEN_DARK} to login into PowerDB server${NC}"
          echo
        fi
        echo -e "\033[44;32;1mPowerDB is installed successfully!${NC}"
        echo       
    else # Only install client
        install_bin
        install_config

        echo
        echo -e "\033[44;32;1mPowerDB client is installed successfully!${NC}"
    fi

    rm -rf $(tar -tf power.tar.gz)
}


## ==============================Main program starts from here============================
serverFqdn=$(hostname)
if [ "$verType" == "server" ]; then
    # Install server and client
    if [ -x ${bin_dir}/powerd ]; then
        update_flag=1
        update_PowerDB
    else
        install_PowerDB
    fi
elif [ "$verType" == "client" ]; then
    interactiveFqdn=no
    # Only install client
    if [ -x ${bin_dir}/power ]; then
        update_flag=1
        update_PowerDB client
    else
        install_PowerDB client
    fi
else 
    echo  "please input correct verType"   
fi