name: Docs deploy pre-check

on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
      - labeled
      - unlabeled

permissions:
  contents: "read"
  id-token: "write"
  pull-requests: "write"

defaults:
  run:
    shell: bash --noprofile --norc -euo pipefail {0}

concurrency:
  group: pr-${{ github.event.pull_request.number }}-auto-docs-check
  cancel-in-progress: true

jobs:
  check-cherry-pick:
    name: Check if merge commit can be cherry-picked
    runs-on: ubuntu-latest
    if: github.event.pull_request.head.repo.owner.login == 'rerun-io' && contains(github.event.pull_request.labels.*.name, 'deploy docs')
    steps:
      - uses: actions/checkout@v3
        with:
          # ref - not set, because we want to end up on the merge commit
          fetch-depth: 0 # don't perform a shallow clone

      - name: Try cherry-pick
        env:
          GH_TOKEN: ${{ secrets.RERUN_BOT_TOKEN }}
        run: |
          # Setup git user
          git config --global user.name "rerun-bot"
          git config --global user.email "bot@rerun.io"

          git fetch origin main
          git checkout main
          git merge --squash origin/${{ github.event.pull_request.head.ref }}
          git commit -m "${{ github.event.pull_request.head.title }} (#${{ github.event.pull_request.number }})"
          commit=$(git rev-parse HEAD)
          git checkout docs-latest

          if git cherry-pick $commit; then
            echo "Cherry-pick successful"
            exit 0
          else
            echo "Cherry-pick failed"
            printf $(git diff)
            exit 1
          fi

      - name: Add success comment
        # https://github.com/mshick/add-pr-comment
        uses: mshick/add-pr-comment@v3.9.1
        # GitHub API is very unreliable. We don't want to fail the entire workflow just because we couldn't post a comment on success.
        continue-on-error: true
        if: success()
        with:
          message-id: "cherry-pick-check"
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          message: |
            Your changes can be cherry-picked to `docs-latest` and will be deployed
            immediately after merging.

      - name: Add failure comment
        # https://github.com/mshick/add-pr-comment
        uses: mshick/add-pr-comment@v3.9.1
        if: failure()
        with:
          message-id: "cherry-pick-check"
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          message: |
            Your changes cannot be automatically cherry-picked to `docs-latest`.

            You should remove the `deploy docs` label and perform the cherry-pick manually after merging.