#!/bin/bash

# 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.

declare FILES_MISSING_COPYRIGHT=()

# Find all files of given format and add license if missing
check_license() {
  ext=$1
  # skipping license for testdata and manifests folders
  FILES=$(find -L . -name "*.${ext}" | grep -vE "(testdata|manifests)")

  for each in $FILES
  do
    if ! grep -Eq 'Apache License|License-Identifier: Apache' $each
    then
      FILES_MISSING_COPYRIGHT+=($each)
    fi
  done
}

check_license 'go'
check_license 'yaml'
check_license 'yml'
check_license 'sh'

if [ ${#FILES_MISSING_COPYRIGHT[@]} -gt 0 ]
then
   echo "Copyright header missing for these files: ${FILES_MISSING_COPYRIGHT[@]}"
   echo "please run make add-copyright"
   exit 1
else
   echo "no file with missing copyright header detected, make target completed successfully"
fi