#!/bin/bash

force=0

function getInstanceIdByEnvTag {
  export instance_ids=$(aws ec2 describe-instances --filter Name=tag:Environment,Values=${environment} | jq '.Reservations[].Instances[].InstanceId' | tr -d '"')

  echo "The following instances with Tag:${environment} will be stopped"
  for instance in ${instance_ids[@]};
  do
    echo ${instance}
  done
}

function execInstancesByInstanceID {
  echo "executing: aws ec2 stop-instances --instance-ids ${instance_ids[@]}" |tr -s '\n' ' '

  for instance in ${instance_ids[*]};
  do
    echo "Executing $1 on instance: ${instance}"
    aws ec2 $1-instances --instance-ids ${instance}
  done
}

while getopts ":e:sf" opt; do
  case $opt in
    e)
      environment=$OPTARG
      ;;
    x)
      getInstanceIdByEnvTag;
      execInstancesByInstanceID "stop";
      ;;
    s)
      echo "starting nodes"
      getInstanceIdByEnvTag;
      execInstancesByInstanceID "start";
      ;;
    f)
      force=1
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done