#!/usr/bin/env bash

# Copyright 2020 The Knative Authors
#
# 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 -o errexit
set -o nounset
set -o pipefail

source $(dirname "${BASH_SOURCE[0]}")/../vendor/knative.dev/hack/library.sh

readonly TMP_DIFFROOT="$(mktemp -d)"
DIRS_TOBE_INSPECTED=(
  "go.sum"
  "vendor"
  "config"
  "third_party"
)

cleanup() {
  rm -rf "${TMP_DIFFROOT}"
}

trap "cleanup" EXIT SIGINT

cleanup

mkdir -p "${TMP_DIFFROOT}/pkg"
# Save working tree state
for dir in ${DIRS_TOBE_INSPECTED[@]}; do
  cp -aR "${REPO_ROOT_DIR}/${dir}" "${TMP_DIFFROOT}"
done

"${REPO_ROOT_DIR}/hack/update-codegen.sh"
echo "Diffing ${REPO_ROOT_DIR} against freshly generated codegen"
ret=0
for dir in ${DIRS_TOBE_INSPECTED[@]}; do
  diff -Nupr --no-dereference "${REPO_ROOT_DIR}/${dir}" "${TMP_DIFFROOT}/${dir}" || \
    { ret=1; echo "--- FAIL: ${REPO_ROOT_DIR}/${dir} is not up-to-date"; }
done

# Restore working tree state
for dir in {DIRS_TOBE_INSPECTED[@]}; do
  rm -fr "${REPO_ROOT_DIR}/${dir}"
done
cp -aR "${TMP_DIFFROOT}"/* "${REPO_ROOT_DIR}"

if [[ $ret -eq 0 ]]
then
  echo "${REPO_ROOT_DIR} up to date."
else
  echo "ERROR: ${REPO_ROOT_DIR} is out of date. Please run ./hack/update-codegen.sh"
  exit 1
fi
