#!/usr/bin/env bash

# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# "---------------------------------------------------------"
# "-                                                       -"
# "-  Helper script to generate terraform variables        -"
# "-  file based on glcoud defaults.                       -"
# "-                                                       -"
# "---------------------------------------------------------"

# "---------------------------------------------------------"
# "-                                                       -"
# "-  Helper script to generate terraform variables        -"
# "-  file based on glcoud defaults.                       -"
# "-                                                       -"
# "---------------------------------------------------------"

# Stop immediately if something goes wrong
set -euo pipefail

# The purpose of this script is to populate variables for subsequent terraform
# commands.

ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." && pwd )"
# shellcheck source=scripts/common.sh
source "$ROOT/scripts/common.sh"

check_dependency_installed gcloud

# gcloud config holds values related to your environment. If you already
# defined a default zone we will retrieve it and use it
ZONE="$(gcloud config get-value compute/zone)"
if [[ -z "${ZONE}" ]]; then
    echo "https://cloud.google.com/compute/docs/regions-zones/changing-default-zone-region" 1>&2
    echo "gcloud cli must be configured with a default zone." 1>&2
    echo "run 'gcloud config set compute/zone ZONE'." 1>&2
    echo "replace 'ZONE' with the zone name like us-west1-a." 1>&2
    exit 1;
fi

# Write out the file now in the terraform directory.
cat <<EOF > "${ROOT}/terraform/terraform.tfvars"
project="${PROJECT}"
zone="${ZONE}"
EOF
