#!/bin/bash
#
# Copyright 2016-present Google Inc. 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.

# Writes a CHANGELOG.md-ready list of changes in this release, organized by component, to stdout.

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"; pushd $DIR >> /dev/null
MDC_ROOT="$(git rev-parse --show-toplevel | tail -n1)"; popd >> /dev/null
cd $MDC_ROOT

if [ ! $(git rev-parse --verify release-candidate 2> /dev/null) ]; then
  echo "Please cut a release first by running scripts/release/cut."
  exit 1
fi

echo "## Component changes"

find components -type d -name 'src' | while read path; do
  folder=$(dirname $path)
  component=$(echo $folder | cut -d'/' -f2-)

  if [[ $component == private* ]]; then
    continue;
  fi
  
  if [ $(git log --pretty=oneline --no-merges origin/master..release-candidate $folder \
         | wc -l) == "0" ]; then
    continue
  fi

  componentdiff() {
    git log \
      --pretty="* [%s](https://github.com/google/material-components-ios/commit/%H) (%an)" \
      --no-merges \
      origin/master..release-candidate \
      $folder
  }

  if [[ $(componentdiff) ]]; then
    echo
    echo "### $component"

    if [[ $(componentdiff | grep "\[$component\]\!") ]]; then
      echo
      echo "#### Breaking changes"
      echo

      componentdiff \
        | grep "\[$component\]\!" \
        | sed "s|\[$component\]!|**Breaking**: |" \
        | sort
    fi

    if [[ $(componentdiff | grep -v "\[$component\]\!") ]]; then
      echo
      echo "#### Changes"
      echo

      componentdiff \
        | grep -v "\[$component\]!" \
        | sed "s|\[$component\] ||" \
        | sort
    fi
  fi

done