#!/usr/bin/env bash
# Bash script template from https://betterdev.blog/minimal-safe-bash-script-template/

set -Eeuo pipefail

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-l] [-s s-1vcpu-1gb] [-i docker-20-04]

A wrapper around doctl for easy creation of droplets.

Available options:

-h, --help      Print this help and exit
-v, --verbose   Print script debug info
-l, --large     Create a s-4vcpu-8gb instance (optional, default is s-1vcpu-1gb)
-s, --size      Specify the instance size to create (use "doctl compute size list" to see all instance sizes) (optional, default is s-1vcpu-1gb)
-i, --image     Specify the image to create (use "doctl compute image list-application; doctl compute image list-distribution; doctl compute image list-user" to see all images) (optional, default is docker-20-04)
EOF
  exit
}

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

parse_params() {
  # default values of variables set from params
  INSTANCE_SIZE='s-1vcpu-1gb'
  IMAGE='docker-20-04'

  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose) set -x ;;
    -l | --large) INSTANCE_SIZE='s-4vcpu-8gb' ;;
    -s | --size)
      INSTANCE_SIZE="${2-}"
      shift
      ;;
    -i | --image)
      IMAGE="${2-}"
      shift
      ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
    esac
    shift
  done

  args=("$@")

  return 0
}

parse_params "$@"

if ! command -v doctl &> /dev/null
then
    die "Error! Please make sure that 'doctl' is installed in your path."
fi

msg "Creating a droplet using image $IMAGE of size $INSTANCE_SIZE."
msg "This command will finish once the droplet is created."
doctl compute droplet create --region fra1 --ssh-keys "b5:c0:09:bd:dc:ac:3e:75:85:28:0a:f8:a4:8e:02:78" --image $IMAGE --wait --size $INSTANCE_SIZE $(date +"instance-%m-%d-%Y-%H-%M")