checkvalidpr.yaml

name: PR Auto Grader

on:
  pull_request_target:
    branches:
      - main

permissions:
  contents: write
  pull-requests: write

jobs:
  grade:
    name: PR Auto Grader
    runs-on: ubuntu-latest
    env:
      # Future-proofing against the Node 20 deprecation warning
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

    steps:
      # 1️⃣ Checkout the Student's PR branch
      # We use fetch-depth: 0 to ensure we have the history needed for git diff
      - name: Checkout PR Code
        uses: actions/checkout@v4
        with:
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.ref }}
          fetch-depth: 0

      # 2️⃣ Checkout Private Grader Repository
      # Using the PAT to access your private test runner
      - name: Checkout Private Grader
        uses: actions/checkout@v4
        with:
          repository: Once-1296/CoC-workshop-test-runner
          token: ${{ secrets.GRADER_REPO_TOKEN }}
          path: grader_repo
          persist-credentials: false

      # 3️⃣ Fetch the Main branch from the ORIGINAL repo
      # This fixes the "fatal: bad object" error by letting Git see the Base SHA
      - name: Fetch Main Branch
        run: |
          git remote add upstream https://github.com/${{ github.repository }}
          git fetch upstream main

      # 4️⃣ Assemble Workspace
      # Note: Ensure the folder structure matches your Python allowed_prefix logic
      - name: Assemble Workspace
        run: |
          mkdir -p workspace/student_repo
          cp -r grader_repo/grader workspace/
          cp -r grader_repo/hidden_tests workspace/
          
          # Adjusting this to match your Python script's expected path
          # If the folder is SOLUTIONS/username, we copy that content
          TARGET_DIR="SOLUTIONS/${{ github.event.pull_request.user.login }}"
          if [ -d "$TARGET_DIR" ]; then
            cp -r "$TARGET_DIR/." workspace/student_repo/
          else
            echo "⚠️ Warning: $TARGET_DIR not found"
          fi
          
          ls -R workspace

      # 5️⃣ Validate Repository Structure
      - name: Validate Structure
        run: python3 grader_repo/grader/validate_structure.py

      # 6️⃣ Validate Only Allowed Files Modified
      - name: Validate Diff
        run: python3 grader_repo/grader/validate_diff.py
        env:
          GITHUB_BASE_SHA: ${{ github.event.pull_request.base.sha }}
          GITHUB_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
          PULL_REQUEST_AUTHOR: ${{ github.event.pull_request.user.login }}