name: Release Plan Review
on:
  push:
    branches:
      - main
      - master
  pull_request:
    types:
      - labeled

concurrency:
  group: plan-release # only the latest one of these should ever be running
  cancel-in-progress: true

jobs:
  check-plan:
    name: 'Check Release Plan'
    runs-on: ubuntu-latest
    outputs:
      command: ${{ steps.check-release.outputs.command }}

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: 'main'
      # This will only cause the `check-plan` job to have a "command" of `release`
      # when the .release-plan.json file was changed on the last commit.
      - id: check-release
        run: if git diff --name-only HEAD HEAD~1 | grep -w -q ".release-plan.json"; then echo "command=release"; fi >> $GITHUB_OUTPUT

  prepare_release_notes:
    name: Prepare Release Notes
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: check-plan
    permissions:
      contents: write
      pull-requests: write
    outputs:
      explanation: ${{ steps.explanation.outputs.text }}
    # only run on push event if plan wasn't updated (don't create a release plan when we're releasing)
    # only run on labeled event if the PR has already been merged
    if: (github.event_name == 'push' && needs.check-plan.outputs.command != 'release') || (github.event_name == 'pull_request' && github.event.pull_request.merged == true)

    steps:
      - uses: actions/checkout@v4
        # We need to download lots of history so that
        # github-changelog can discover what's changed since the last release
        with:
          fetch-depth: 0
          ref: 'main'
      - uses: wyvox/action-setup-pnpm@v3
      - run: pnpm install --frozen-lockfile

      - name: 'Generate Explanation and Prep Changelogs'
        id: explanation
        run: |
          set +e

          pnpm release-plan prepare 2> >(tee -a release-plan-stderr.txt >&2)


          if [ $? -ne 0 ]; then
            echo 'text<<EOF' >> $GITHUB_OUTPUT
            cat release-plan-stderr.txt >> $GITHUB_OUTPUT
            echo 'EOF' >> $GITHUB_OUTPUT
          else
            echo 'text<<EOF' >> $GITHUB_OUTPUT
            jq .description .release-plan.json -r >> $GITHUB_OUTPUT
            echo 'EOF' >> $GITHUB_OUTPUT
            rm release-plan-stderr.txt
          fi
        env:
          GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}

      - uses: peter-evans/create-pull-request@v6
        with:
          commit-message: "Prepare Release using 'release-plan'"
          labels: 'internal'
          branch: release-preview
          title: Prepare Release
          body: |
            This PR is a preview of the release that [release-plan](https://github.com/embroider-build/release-plan) has prepared. To release you should just merge this PR 👍

            -----------------------------------------

            ${{ steps.explanation.outputs.text }}
