#!/bin/bash

if [ "$(id -u)" != "0" ]; then
  echo "You must be root to run this script."
  exit 1
fi

if [ $# -gt 0 ]; then
  CONF=$1

  if [ $CONF == "shiny-server-rules" ]; then
    echo "shiny-server-rules is not a valid configuration."
    exit 1
  fi

else
  # No arguments passed. Use the default.
  CONF="default"
fi

echo "Attempting to deploy configuration named: $CONF"
FILE="/opt/shiny-server/config/$CONF.config"
if [ ! -f $FILE ]; then
  echo "ERROR: There is no configuration named: $CONF"
  exit 1
fi

SSCONF="/etc/shiny-server/shiny-server.conf"

# Restart
restart_shiny () {
  echo "Restarting Shiny Server..."
  INIT_SYSTEM=`cat /proc/1/comm`
  if test $INIT_SYSTEM = "systemd"
  then
    systemctl stop shiny-server.service 2>/dev/null
    echo "Waiting..."
    systemctl start shiny-server.service
  elif test -d /etc/init/
  then
    initctl stop shiny-server 2>/dev/null
    echo "Waiting..."
    initctl start shiny-server
  else
    /sbin/service shiny-server stop 2>/dev/null
    echo "Waiting..."
    sleep 5
    /sbin/service shiny-server start
  fi
  echo
  echo "The $CONF config is all setup now. Enjoy!"
}

copy_config () {
  /bin/cp -f $1 $SSCONF 
  echo "Copied $1 to $SSCONF."

  echo "Installing sample apps..."
  
  if [ ! -e /srv/shiny-server/index.html ]; then
    ln -s /opt/shiny-server/samples/welcome.html /srv/shiny-server/index.html
    echo "Created /srv/shiny-server/index.html"
  else
    echo "/srv/shiny-server/index.html already exists. Not overwriting."
  fi

  if [ ! -e /srv/shiny-server/sample-apps ]; then
    ln -s /opt/shiny-server/samples/sample-apps /srv/shiny-server/sample-apps
    echo "Created /srv/shiny-server/sample-apps/"
  else
    echo "/srv/shiny-server/sample-apps already exists. Not overwriting."
  fi
  
  echo "Done installing samples."

  restart_shiny
}

if [ -f $SSCONF ]; then
  read -p "Configuration file already exists at /etc/shiny-server/shiny-server.conf. Are you sure you want to overwrite it? [yN]" -n 1 -r
  echo 
  if [[ $REPLY =~ ^[Yy]$ ]]; then
    copy_config $FILE
  else 
    echo "Not overwriting existing file. Exiting."
    exit 1
  fi
else
  copy_config $FILE
fi