#  Copyright 2021 Collate
#  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.

name: Java Checkstyle

# read-write repo token
# access to secrets
on:
  pull_request_target:
    branches: [ main ]

concurrency: 
  group: java-checkstyle-${{ github.head_ref }}
  cancel-in-progress: true
jobs:
  java-checkstyle:
    runs-on: ${{matrix.os}}

    strategy:
      matrix:
        os:
          - ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Set up JDK 11
        uses: actions/setup-java@v1
        with:
          java-version: 11

      - name: Run checkstyle
        run: mvn googleformatter:format@reformat-sources

      - name: Save checkstyle outcome
        id: git
        continue-on-error: true
        run: |
          git diff-files --quiet

      - name: Create a comment in the PR with the instructions
        if: steps.git.outcome != 'success'
        uses: peter-evans/create-or-update-comment@v1
        with:
          issue-number: ${{ github.event.pull_request.number }}
          body: |
            **The Java checkstyle failed.**

            Please run `mvn googleformatter:format@reformat-sources` in the root of your repository and commit the changes to this PR.
            You can also use [pre-commit](https://pre-commit.com/) to automate the Java code formatting.

            You can install the pre-commit hooks with `make install_test precommit_install`.

      - name: Java checkstyle failed, check the comment in the PR
        if: steps.git.outcome != 'success'
        run: |
          exit 1