#!/usr/bin/env bash

TTL="8h"
CERTIFICATE_GROUP="system:masters"
DEBUG=""

print_usage() {
  echo "gs-login - login to Giant Swarm managed clusters"
  echo " "
  echo "gs-login [INSTALLATION] [WORKLOAD CLUSTER] [ORGANISATION]"
  echo " "
  echo "Examples:"
  echo "> gs-login gauss"
  echo "> gs-login gauss mywc1"
  echo " "
  echo "Options:"
  echo "-h, --help                show this help text"
  echo "-t, --ttl                 the certificate ttl for the workload cluster login (default: 8h)"
  echo "-g, --certificate-group   the certificate group to login as on the workload cluster (default: system:masters)"
}

POS_ARGS=()

while test $# -gt 0; do
  case "$1" in
    -t|--ttl)
      shift
      TTL=$1
      shift
      ;;
    -g|--certificate-group)
      shift
      CERTIFICATE_GROUP=$1
      shift
      ;;
    -h|--help)
      print_usage
      exit 0
      ;;
    --debug)
      DEBUG="--debug"
      shift
      ;;
    /)
      # We want to ignore slash seperators between MC and WC
      shift
      ;;
    *)
      POS_ARGS+=(`echo $1 | tr '/' ' '`)
      shift
      ;;
  esac
done

if [ ${#POS_ARGS[@]} -eq 0 ]; then
  POS_ARGS+=(`opsctl list installations --short | tr ' ' '\n' | fzf`)
fi

MC_EXIST=$(kubectl config get-contexts --no-headers -o name gs-${POS_ARGS[0]} 2>/dev/null | wc -l | xargs)

case ${#POS_ARGS[@]} in
  1)
    opsctl login ${DEBUG} ${POS_ARGS[0]}
    ;;
  2)
    opsctl login ${DEBUG} ${POS_ARGS[0]} ${POS_ARGS[1]}
    ;;
  3)
    if [ ${MC_EXIST} -eq 0 ]; then gs-login ${POS_ARGS[0]}; fi
    ORG_FLAG="--organization ${POS_ARGS[2]}"
    if [[ "${POS_ARGS[2]}" == "default" ]]; then
      ORG_FLAG="--insecure-namespace"
    fi
    kubectl gs login ${POS_ARGS[0]} --workload-cluster ${POS_ARGS[1]} --certificate-group ${CERTIFICATE_GROUP} --certificate-ttl ${TTL} ${ORG_FLAG} ${DEBUG}
    ;;
  *)
    print_usage
    exit 1
    ;;
esac