#!/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 gcloud defaults.                       -"
# "-                                                       -"
# "---------------------------------------------------------"

# Stop immediately if something goes wrong
set -euo pipefail

ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." && pwd )"

# shellcheck source=scripts/common.sh
source "$ROOT/scripts/common.sh"

# gcloud config holds values related to your environment. If you already
# defined a default project we will retrieve it and use it
PROJECT=$(gcloud config get-value core/project)
if [[ -z "${PROJECT}" ]]; then
    echo "gcloud cli must be configured with a default project." 1>&2
    echo "run 'gcloud config set core/project PROJECT'." 1>&2
    echo "replace 'PROJECT' with the project name." 1>&2
    exit 1;
fi

TFVARS_FILE="$ROOT/terraform/terraform.tfvars"

# We don't want to overwrite a pre-existing tfvars file
if [[ -f "${TFVARS_FILE}" ]]
then
    echo "${TFVARS_FILE} already exists." 1>&2
    echo "Please remove or rename before regenerating." 1>&2
    exit 1;
else
# Write out all the values we gathered into a tfvars file so you don't
# have to enter the values manually
    cat <<EOF > "${TFVARS_FILE}"
project="${PROJECT}"
zone="${ZONE}"
EOF
fi
