name: Release

env:
  GIT_AUTHOR_EMAIL: "packages@datadoghq.com"
  GIT_AUTHOR_NAME: "ci.datadog-api-spec"

on:
  pull_request:
    types: [closed]
    branches:
      - master

jobs:
  create_release:
    name: Create release
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged == true && startsWith(github.head_ref, 'release/')
    steps:
      - name: Get GitHub App token
        id: get_token
        uses: tibdex/github-app-token@v1
        with:
          app_id: ${{ secrets.PIPELINE_GITHUB_APP_ID }}
          private_key: ${{ secrets.PIPELINE_GITHUB_APP_PRIVATE_KEY }}

      - name: Create release
        uses: actions/github-script@v5
        env:
          RELEASE_BRANCH: ${{ github.head_ref }}
        with:
          github-token: ${{ steps.get_token.outputs.token }}
          script: |
            const tagName = process.env.RELEASE_BRANCH.split("/")[1];
            await github.rest.git.createRef({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: `refs/tags/${tagName}`,
              sha: context.payload.pull_request.merge_commit_sha,
            });
            await github.rest.repos.createRelease({
              owner: context.repo.owner,
              repo: context.repo.repo,
              generate_release_notes: true,
              tag_name: tagName,
            });

      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
          token: ${{ steps.get_token.outputs.token }}

      - name: Setup Git
        run: |
          git config user.name "${GIT_AUTHOR_NAME}"
          git config user.email "${GIT_AUTHOR_EMAIL}"

      - name: Set up Ruby 2.6
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.6

      - name: Bump Gem version
        run: |
          git switch -c "${POST_RELEASE_BRANCH}"
          bundle install
          bundle exec gem bump -v dev
          git push -f --set-upstream origin "${POST_RELEASE_BRANCH}"
        env:
          POST_RELEASE_BRANCH: post-${{ github.head_ref }}

      - name: Create PR
        uses: actions/github-script@v5
        env:
          POST_RELEASE_BRANCH: post-${{ github.head_ref }}
          BASE: master
        with:
          github-token: ${{ steps.get_token.outputs.token }}
          script: |
            const { data: pr } = await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              head: process.env.POST_RELEASE_BRANCH,
              base: process.env.BASE,
              title: "Post release",
              body: "Bump to dev version",
            });
            await github.rest.issues.addLabels({
              issue_number: pr.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ["changelog/no-changelog"],
            });