#!/bin/bash
#
# Deploys a playbook

set -e

function usage() {
  cat<<EOF
Usage: $0 [options]

-p playbook     Playbook to be deployed. Is the script for Kubeless: slack, taint, isolate.
-e environment  Environment variables for the Kubeless function.  You can pass multiple environment variables passing several -e parameters.
-t topic        NATS topic to subscribe function. You can bind to multiple topics passing several -t parameters.

You must pass the playbook and at least one topic to subscribe.

Example:

deploy_playbook -r slack -t "falco.error.*" -e SLACK_WEBHOOK_URL=http://foobar.com/...
EOF
  exit 1
}

function join { local IFS="$1"; shift; echo "$*"; }

playbook=""
environment=()
topics=()

while getopts "r:e:t:" arg; do
  case $arg in
    r)
      playbook="${OPTARG}"
      ;;
    e)
      environment+=("${OPTARG}")
      ;;
    t)
      topics+=("${OPTARG}")
      ;;
    *)
      usage
      ;;
  esac
done

if [[ "${playbook}" == "" || ${#topics[@]} -eq 0 ]]; then
  usage
fi

pipenv lock --requirements | sed '/^-/ d' > requirements.txt

zip "${playbook}".zip -r playbooks/*.py "${playbook}".py

kubeless function deploy  --from-file "${playbook}".zip \
                          --dependencies requirements.txt \
                          --env "$(join , ${environment[*]})" \
                          --runtime python3.6 \
                          --handler "${playbook}".handler \
                          falco-"${playbook}"

rm requirements.txt ${playbook}.zip

for index in ${!topics[*]}; do
  kubeless trigger nats create falco-"${playbook}"-trigger-"${index}" \
      --function-selector created-by=kubeless,function=falco-${playbook} \
      --trigger-topic "${topics[$index]}"
done