#!/usr/bin/env bash

# Copyright 2018 The Kubernetes Authors All rights reserved.
#
# 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.

export readonly ROOT_DIR=${1:-$(pwd)}

function prepend() {
  local ignore="vendor\|\_gopath\|assets.go"
  local pattern=$1
  local ref=$2
  local headers=$3
  pushd hack/boilerplate > /dev/null
  local files=$(go run boilerplate.go -rootdir ${ROOT_DIR} -boilerplate-dir ${ROOT_DIR}/hack/boilerplate | grep -v "$ignore" | grep "$pattern")
  popd > /dev/null
  for f in ${files}; do
    echo ${f};
    local copyright="$(cat hack/boilerplate/boilerplate.${ref}.txt | sed s/YEAR/$(date +%Y)/g)"
    local file_headers=""

    if [ "${headers}" != "" ]; then
      file_headers="$(cat ${f} | grep ${headers})"
    fi

    if [ "${file_headers}" != "" ]; then
        fileContent="$(cat ${f} | grep -v ${headers})"
        printf '%s\n\n%s\n%s\n' "$file_headers" "${copyright}" "$fileContent" > ${f}
    else
      fileContent="$(cat ${f})"
      printf '%s\n\n%s\n' "${copyright}" "$fileContent" > ${f}
    fi

    done
}

prepend "\.go" "go" "+build"
prepend "\.py" "py"
prepend "\.sh" "sh" "#!"
prepend Makefile Makefile
prepend Dockerfile Dockerfile