name: Plan Release
on:
  workflow_dispatch:
  push:
    branches:
      - main
      - master
  pull_request_target: # This workflow has permissions on the repo, do NOT run code from PRs in this workflow. See https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
    types:
      - labeled
      - unlabeled

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

jobs:
  is-this-a-release:
    name: "Is this a release?"
    runs-on: ubuntu-latest
    outputs:
      command: ${{ steps.check-release.outputs.command }}

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2
          ref: 'main'
      # This will only cause the `is-this-a-release` 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

  create-prepare-release-pr:
    name: Create Prepare Release PR
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: is-this-a-release
    permissions:
      contents: write
      issues: read
      pull-requests: write
    # only run on push event or workflow dispatch 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' || github.event_name == 'workflow_dispatch') && needs.is-this-a-release.outputs.command != 'release') || (github.event_name == 'pull_request_target' && 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: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 18
          cache: pnpm
      - 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 [ $? -ne 0 ]; then
            release_plan_output=$(cat release-plan-stderr.txt)
          else
            release_plan_output=$(jq .description .release-plan.json -r)
            rm release-plan-stderr.txt

            if [ $(jq '.solution | length' .release-plan.json) -eq 1 ]; then
              new_version=$(jq -r '.solution[].newVersion' .release-plan.json)
              echo "new_version=v$new_version" >> $GITHUB_OUTPUT
            fi
          fi
            echo 'text<<EOF' >> $GITHUB_OUTPUT
          echo "$release_plan_output" >> $GITHUB_OUTPUT
            echo 'EOF' >> $GITHUB_OUTPUT
        env:
          GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}

      - uses: peter-evans/create-pull-request@v7
        with:
          commit-message: "Prepare Release ${{ steps.explanation.outputs.new_version}} using 'release-plan'"
          labels: "internal"
          branch: release-preview
          title: Prepare Release ${{ steps.explanation.outputs.new_version }}
          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 }}