name: Check PRs for merge conflicts

on:
  # Check for new conflicts due to merges.
  push:
    branches:
      - main
  # Check conflicts in new PRs and for resolved conflicts due to an open PR being updated.
  pull_request_target:
    types:
      - opened
      - synchronize
      - reopened
  # Allow manually triggering the workflow.
  workflow_dispatch:

permissions: {}

jobs:
  check-prs:
    runs-on: ubuntu-latest
    if: github.repository_owner == 'MyOrg'

    name: Check PRs for merge conflicts

    permissions:
      pull-requests: write # to label PRs

    steps:
      - name: Check PRs for merge conflicts
        uses: eps1lon/actions-label-merge-conflict@1df065ebe6e3310545d4f4c4e862e43bdca146f0 # v3.0.3
        with:
          dirtyLabel: "Status: has merge conflict"
          repoToken: ${{ secrets.GITHUB_TOKEN }}

name: Label new PRs

on:
  # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target
  # The `pull_request_target` event is used for "normal" PRs to label them when they are opened.
  # This will use the `labeler.yml` file in the default branch of the repo.
  pull_request_target:
    types:
      - opened
      - ready_for_review

  # The `pull_request` event is used for PRs which change the files which handle the labelling to prevent a silently failing action.
  # This will use the `labeler.yml` file in the PR branch.
  pull_request:
    paths:
      - '.github/workflows/label-new-prs.yml'
      - '.github/labeler.yml'

jobs:
  label-new-prs:
    runs-on: ubuntu-latest
    if: github.repository_owner == 'MyOrg' && github.event_name == 'pull_request_target'

    name: Add labels to new PRs

    steps:
      - name: Label new PRs
        uses: srvaroa/labeler@v1
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

  validate-labeler-worflow:
    runs-on: ubuntu-latest
    if: github.repository_owner == 'MyOrg' && github.event_name == 'pull_request' && github.event.pull_request.merged == false

    name: Validate changes to Labeler logic

    steps:
      # Checkout is needed to use the `use_local_config` option.
      - name: Checkout code
        uses: actions/checkout@v5

      - name: Verify changes to the labeling logic
        uses: srvaroa/labeler@v1
        with:
          use_local_config: true
          fail_on_error: true
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"