3-step.yml

name: Step 3

on:
  pull_request:
    types: [opened, reopened, synchronize]
  workflow_dispatch:

permissions:
  contents: read
  actions: write
  issues: write
  pull-requests: write

env:
  STEP_4_FILE: ".github/steps/4-step.md"

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  find_exercise:
    name: Find Exercise Issue
    uses: skills/exercise-toolkit/.github/workflows/find-exercise-issue.yml@v0.7.1

  step4_merge_guidance:
    name: Post Step 4 (merge/conflicts) guidance
    needs: [find_exercise]
    runs-on: ubuntu-latest
    if: ${{ github.event_name == 'pull_request' }}
    env:
      ISSUE_REPOSITORY: ${{ github.repository }}
      ISSUE_NUMBER: ${{ needs.find_exercise.outputs.issue-number }}

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Detect PR mergeability
        id: prinfo
        uses: actions/github-script@v7
        with:
          script: |
            const { owner, repo } = context.repo;
            const number = context.payload.pull_request.number;
            const { data: pr } = await github.rest.pulls.get({ owner, repo, pull_number: number });
            core.setOutput('mergeable_state', pr.mergeable_state || 'unknown');

      - name: Build status line
        id: status
        run: |
          state='${{ steps.prinfo.outputs.mergeable_state }}'
          if [ "$state" = "clean" ] || [ "$state" = "unstable" ] || [ "$state" = "blocked" ]; then
            echo "line=✅ Pas de conflit bloquant détecté, tu peux **fusionner** ta PR" >> $GITHUB_OUTPUT
          elif [ "$state" = "dirty" ]; then
            echo "line=⚠️ Conflits détectés, suis les étapes ci-dessous pour les résoudre" >> $GITHUB_OUTPUT
          else
            echo "line=ℹ️ État de fusion inconnu pour le moment, suis le guide ci-dessous si GitHub indique des conflits" >> $GITHUB_OUTPUT
          fi

      - name: Find existing Step 4 comment
        id: find
        uses: peter-evans/find-comment@v3
        with:
          repository: ${{ env.ISSUE_REPOSITORY }}
          issue-number: ${{ env.ISSUE_NUMBER }}
          comment-author: github-actions[bot]
          body-includes: "## Étape 4, résoudre les conflits et fusionner"

      - name: Create or update Step 4 comment
        uses: GrantBirki/comment@v2.1.1
        with:
          repository: ${{ env.ISSUE_REPOSITORY }}
          issue-number: ${{ env.ISSUE_NUMBER }}
          file: ${{ env.STEP_4_FILE }}
          edit-mode: ${{ steps.find.outputs.comment-id && 'replace' || 'append' }}
          comment-id: ${{ steps.find.outputs.comment-id }}
          vars: |
            status_line: ${{ steps.status.outputs.line }}