#!/bin/bash

export EC2_HOME="/usr/share/ec2/ec2-api-tools"
export JAVA_HOME="$(dirname $(dirname $(readlink /etc/alternatives/java)))"
export PATH="$PATH:${EC2_HOME}/bin"
export TZ="UTC"

# retrieve AWS_* environment variables
if [ -r "$HOME/.ec2-create-ngcp" ] ; then
  source "$HOME/.ec2-create-ngcp"
fi

usage() {
  echo "$0 - script to stop the specified EC2 instance ID

Usage:

  $0 <instance_id>

Supported OPTIONS:

  --help                    display this help text
  --region <REGION>         specify region that should be used
                            (if unset defaults to the eu-west-1 zone)
"
}

CMDLINE_OPTS=help,region:

_opt_temp=$(getopt --name $0 -o +bch --long $CMDLINE_OPTS -- "$@")
if [ $? -ne 0 ]; then
  echo "Try '$0 --help' for more information." >& 2
  exit 1
fi
eval set -- "$_opt_temp"

_opt_public=false

while :; do
  case "$1" in
  --help)
    usage ; exit 0;
    ;;
  --region)
    shift; AWS_REGION="$1"
    ;;
  --)
    shift; break
    ;;
  *)
    echo "Internal getopt error! $1" >&2
    exit 1
    ;;
  esac
  shift
done

# if unset set sane defaults
[ -n "$AWS_REGION" ] || AWS_REGION="eu-west-1"

if [ -z "$AWS_ACCESS_KEY" ] ; then
  echo "AWS_ACCESS_KEY is unset, can not continue." >&2
  exit 1
fi

if [ -z "$AWS_SECRET_KEY" ] ; then
  echo "AWS_SECRET_KEY is unset, can not continue." >&2
  exit 1
fi

check4progs(){
  local RC=''
  for arg in $* ; do
    which $arg >/dev/null 2>&1 || RC="$arg"
  done
  if [ -n "$RC" ] ; then
    echo "$RC not found/executable" >&2
    return 1
  fi
}

if ! check4progs ec2-stop-instances ; then
  echo "Required tools not found, forgot to install ec2-api-tools?" >&2
  exit 1
fi

INSTANCE_ID="$1"

echo "Stopping Instance ID $INSTANCE_ID"
ec2-stop-instances --region "$AWS_REGION" "$INSTANCE_ID"
if [ $? -ne 0 ] ; then
  echo "Noticed problem when trying to stop Instance with ID $INSTANCE_ID" >&2
  exit 1
fi