#!/bin/bash
# Copyright 2023 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
#
#      http://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.
################################################################################

set -euo pipefail

# Fail if RELEASE_VERSION is not set.
if [[ -z "${RELEASE_VERSION:-}" ]]; then
  echo "RELEASE_VERSION must be set" >&2
  exit 1
fi

IS_KOKORO="false"
if [[ -n "${KOKORO_ARTIFACTS_DIR:-}" ]]; then
  IS_KOKORO="true"
fi
readonly IS_KOKORO

# If not defined, default to /tmp.
: "${TMPDIR:="/tmp"}"

# WARNING: Setting this environment varialble to "true" will cause this script
# to actually perform a release.
: "${DO_MAKE_RELEASE:="false"}"

if [[ ! "${DO_MAKE_RELEASE}" =~ ^(false|true)$ ]]; then
  echo "DO_MAKE_RELEASE must be either \"true\" or \"false\"" >&2
  exit 1
fi

if [[ "${IS_KOKORO}" == "true" ]] ; then
  readonly TINK_BASE_DIR="$(echo "${KOKORO_ARTIFACTS_DIR}"/git*)"
  cd "${TINK_BASE_DIR}/tink_go"
fi

GITHUB_RELEASE_UTIL_OPTS=()
if [[ "${IS_KOKORO}" == "true" ]] ; then
  # Note: KOKORO_GIT_COMMIT is populated by Kokoro.
  GITHUB_RELEASE_UTIL_OPTS+=(
    -c "${KOKORO_GIT_COMMIT}"
    -t "${GITHUB_ACCESS_TOKEN}"
  )
fi

if [[ "${DO_MAKE_RELEASE}" == "true" ]]; then
  GITHUB_RELEASE_UTIL_OPTS+=( -r )
fi

readonly GITHUB_RELEASE_UTIL_OPTS

# If running on Kokoro, TMPDIR is populated with the tmp folder.
readonly TMP_DIR="$(mktemp -d "${TMPDIR}/release_XXXXXX")"
readonly RELEASE_UTIL_SCRIPT="$(pwd)/kokoro/testutils/github_release_util.sh"
if [[ ! -f "${RELEASE_UTIL_SCRIPT}" ]]; then
  echo "${RELEASE_UTIL_SCRIPT} not found."
  echo "Make sure you run this script from the root of tink-go."
  return 1
fi

pushd "${TMP_DIR}"
# Create a release branch.
"${RELEASE_UTIL_SCRIPT}" "${GITHUB_RELEASE_UTIL_OPTS[@]}" create_branch \
  "${RELEASE_VERSION}" tink-go
popd
