name: 'release'

on:
  push:
    branches:
    - 'main'
  workflow_dispatch:

jobs:
  # build compiles the code and creates a pull request of the compiled result if
  # there is a diff.
  build:
    runs-on: 'ubuntu-latest'
    steps:
    - uses: 'actions/checkout@v2'

    - uses: 'actions/setup-node@v2'
      with:
        node-version: '12.x'

    - name: 'npm build'
      run: 'npm ci && npm run build'

    - name: 'Create pull request'
      uses: 'peter-evans/create-pull-request@dcd5fd746d53dd8de555c0f10bca6c35628be47a'
      with:
        token: '${{ secrets.ACTIONS_BOT_TOKEN }}'
        add-paths: 'dist/'
        committer: 'google-github-actions-bot <github-actions-bot@google.com>'
        author: 'google-github-actions-bot <github-actions-bot@google.com>'
        signoff: 'google-github-actions-bot <github-actions-bot@google.com>'
        commit-message: 'Build dist'
        title: 'chore: build dist'
        body: 'Build compiled Typescript'
        base: 'main'
        branch: 'actions/build'
        push-to-fork: 'google-github-actions-bot/auth'
        delete-branch: true

  # create-pull-request creates a release pull request if there are any
  # convential commit changes since the last release.
  create-pull-request:
    runs-on: 'ubuntu-latest'
    steps:
    - uses: 'google-github-actions/release-please-action@v2'
      with:
        token: '${{ secrets.ACTIONS_BOT_TOKEN }}'
        release-type: 'node'
        bump-minor-pre-major: true
        command: 'release-pr'
        fork: true

  # release does a release on the merge of the release pull request. It also
  # updates the floating tag alias for the major version.
  release:
    runs-on: 'ubuntu-latest'
    steps:
    - id: 'release'
      uses: 'google-github-actions/release-please-action@v2'
      with:
        release-type: 'node'
        bump-minor-pre-major: true
        command: 'github-release'

    - name: 'Update floating tag'
      if: '${{ steps.release.outputs.release_created }}'
      uses: 'actions/github-script@v5'
      with:
        script: |-
          const sha = '${{ steps.release.outputs.sha }}'
          const major = 'v${{ steps.release.outputs.major }}';

          // Try to update the ref first. If that fails, it probably does not
          // exist yet, and we should create it.
          try {
            await github.rest.git.updateRef({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: `tags/${major}`,
              sha: sha,
              force: true,
            });
            core.info(`Updated ${major} to ${sha}`);
          } catch(err) {
            core.warning(`Failed to create ${major}: ${err}`);

            await github.rest.git.createRef({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: `refs/tags/${major}`,
              sha: sha,
            });
            core.info(`Created ${major} at ${sha}`);
          }