#!/bin/bash -e

here=$(dirname "$0")
# shellcheck source=scripts/gcloud.sh
source "$here"/../scripts/gcloud.sh
# shellcheck source=net/common.sh
source "$here"/common.sh

prefix=testnet-dev-$(whoami | sed -e s/[^a-z0-9].*//)
validatorNodeCount=
clientNodeCount=

imageName="ubuntu-16-04-cuda-9-2-new"
internalNetwork=false
zone="us-west1-b"

usage() {
  exitcode=0
  if [[ -n "$1" ]]; then
    exitcode=1
    echo "Error: $*"
  fi
  cat <<EOF
usage: $0 [create|config|delete] [common options] [command-specific options]

Manage a GCE-based testnet

 create - create a new testnet (implies 'config')
 config - configure the testnet and write a config file describing it
 delete - delete the testnet

 common options:
 -p prefix        - Optional common prefix for instance names to avoid collisions
                    (default: $prefix)

 create-specific options:
 -n number        - Number of validator nodes
 -c number        - Number of client nodes
 -P               - Use GCE internal/private network
 -z               - GCP Zone for the nodes (default: $zone)
 -i imageName     - Existing image on GCE (default: $imageName)

 config-specific options:
   none

 delete-specific options:
   none

EOF
  exit $exitcode
}


command=$1
[[ -n $command ]] || usage
shift
[[ $command = create || $command = config || $command = delete ]] || usage "Invalid command: $command"

while getopts "h?p:Pi:n:c:z:" opt; do
  case $opt in
  h | \?)
    usage
    ;;
  p)
    prefix=$OPTARG
    ;;
  P)
    internalNetwork=true
    ;;
  i)
    imageName=$OPTARG
    ;;
  n)
    validatorNodeCount=$OPTARG
    ;;
  c)
    clientNodeCount=$OPTARG
    ;;
  z)
    zone=$OPTARG
    ;;
  *)
    usage "Error: unhandled option: $opt"
    ;;
  esac
done


writeConfigFile() {
  echo "# autogenerated at $(date)" >> "$configFile"

  declare sshPrivateKey="$netConfigDir/id_$prefix"
  rm -rf "$sshPrivateKey"{,.pub}
  (
    set -x
    ssh-keygen -t ecdsa -N '' -f "$sshPrivateKey"
  )
  echo "sshPrivateKey=$sshPrivateKey" >> "$configFile"

  recordInstanceIp() {
    declare name="$1"
    declare publicIp="$3"
    declare privateIp="$4"

    declare arrayName="$6"

    if $internalNetwork; then
      echo "$arrayName+=($privateIp) # $name" >> "$configFile"
    else
      echo "$arrayName+=($publicIp)  # $name" >> "$configFile"
    fi
  }

  gcloud_FindInstances "name=$prefix-leader" show
  [[ ${#instances[@]} -eq 1 ]] || {
    echo "Unable to start leader"
    exit 1
  }
  gcloud_FigureRemoteUsername "${instances[0]}"
  echo "sshUsername=$gcloud_username" >> "$configFile"
  gcloud_PrepInstancesForSsh "$gcloud_username" "$sshPrivateKey"

  echo "leaderIp=()" >> "$configFile"
  gcloud_ForEachInstance recordInstanceIp leaderIp

  gcloud_FindInstances "name~^$prefix-validator" show
  [[ ${#instances[@]} -gt 0 ]] || {
    echo "Unable to start validators"
    exit 1
  }
  echo "validatorIpList=()" >> "$configFile"
  gcloud_PrepInstancesForSsh "$gcloud_username" "$sshPrivateKey"
  gcloud_ForEachInstance recordInstanceIp validatorIpList

  echo "clientIpList=()" >> "$configFile"
  gcloud_FindInstances "name~^$prefix-client" show
  if [[ ${#instances[@]} -gt 0 ]]; then
    gcloud_PrepInstancesForSsh "$gcloud_username" "$sshPrivateKey"
    gcloud_ForEachInstance recordInstanceIp clientIpList
  fi

  echo "Wrote $configFile"
}

case $command in
delete)
  gcloud_FindInstances "name~^$prefix-"

  if [[ ${#instances[@]} -eq 0 ]]; then
    echo "No instances found matching '^$prefix-'"
    exit 0
  fi
  gcloud_DeleteInstances
  ;;

create)
  [[ -n $validatorNodeCount ]] || usage "Need number of nodes"

  gcloud_CreateInstances "$prefix-leader" 1 "$zone" "$imageName"
  gcloud_CreateInstances "$prefix-validator" "$validatorNodeCount" "$zone" "$imageName"
  if [[ -n $clientNodeCount ]]; then
    gcloud_CreateInstances "$prefix-client" "$clientNodeCount" "$zone" "$imageName"
  fi
  writeConfigFile
  ;;

config)
  writeConfigFile
  ;;
*)
  usage "Unknown command: $command"
esac