name: Update Java API Docs
on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  publish:
    name: Generate Java docs
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Set up JDK 11
        uses: actions/setup-java@v3
        with:
          java-version: '11'
          distribution: 'adopt'
      - name: Install gradle wrapper
        run: |
          cd java
          gradle wrapper
      - name: Validate Gradle wrapper
        uses: gradle/wrapper-validation-action@v1
      - name: Build with Gradle
        uses: gradle/gradle-build-action@v2
        with:
          build-root-directory: java
          arguments: javadoc
      - name: Set commit ID
        id: vars
        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
      - uses: actions/checkout@v2
        with:
          ref: gh-pages
          clean: false
      - name: Move API docs into target area
        run: |
          rm -rf docs/api/java
          mv java/build/docs/javadoc docs/api/java
      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v3
        with:
          branch: gh-pages-pr
          base: gh-pages
          title: '[Automated]: Update Java API docs'
          commit-message: 'Update Java API docs to commit ${{ steps.vars.outputs.sha_short }}'
          add-paths: docs/api/java