classroom.yml

name: GitHub Classroom Workflow

on:
  push:
    branches: [main]

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

jobs:
  autograding:
    name: Autograding
    runs-on: ubuntu-latest
    outputs:
      grading_status: ${{ steps.grading.outcome }}
    steps:
      - uses: actions/setup-java@v5
        with:
          distribution: 'temurin'
          java-version: '25'
      - uses: actions/checkout@v5

      # 🧪 Compilation
      - name: Compilation Check
        id: compile
        run: mvn -ntp compile

      # ✅ Basic functionality
      - name: Basic Tests
        id: basic
        run: mvn -ntp test -Dtest=BasicTest

      # ⚠️ Optional edge cases
      - name: Edge Case Tests
        id: edge
        continue-on-error: true
        run: |
          mvn -ntp test -Dtest=EdgeCaseTest
          echo "exit_code=$?" >> $GITHUB_ENV
        
      # 🧮 Scoring and conditional failure
      - name: Calculate and Report Points
        run: |
          POINTS=0
          MAX=3
      
          if [ "${{ steps.compile.outcome }}" == "success" ]; then
            POINTS=$((POINTS + 1))
          else
            echo "❌ Compilation failed"
          fi
      
          if [ "${{ steps.basic.outcome }}" == "success" ]; then
            POINTS=$((POINTS + 1))
          else
            echo "❌ Basic tests failed"
          fi
      
          if [ "$exit_code" -eq 0 ]; then
            POINTS=$((POINTS + 1))
          else
            echo "⚠️ Edge case tests failed (optional)"
          fi
      
          echo "Points ${POINTS}/${MAX}"
          exit 0
  ai_feedback:
    name: AI-Powered Feedback
    needs: autograding
    if: ${{ needs.autograding.result == 'success' }}
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    env:
      OPENROUTER_MODEL: ${{ vars.OPENROUTER_MODEL }}
      SYSTEM_PROMPT: ${{ vars.SYSTEM_PROMPT }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v5

      - name: Read assignment instructions
        id: instructions
        run: |
          # Reads the content of the README.md file into an output variable.
          # The `EOF` marker is used to handle multi-line file content.
          echo "instructions=$(cat README.md | sed 's/\"/\\\"/g' | sed 's/$/\\n/' | tr -d '\n' | sed 's/\\n/\\\\n/g')" >> $GITHUB_OUTPUT

      - name: Read source code
        id: source_code
        run: |
          {
            echo 'source_code<<EOF'
            find src/main/java -type f -name "*.java" | while read -r file; do
              echo "=== File: $file ==="
              cat "$file"
              echo
            done
            echo 'EOF'
          } >> "$GITHUB_OUTPUT"

      - name: Read test code
        id: test_code
        run: |
          {
            echo 'test_code<<EOF'
            if [ -d "src/test/java" ]; then
              find src/test/java -type f -name "*.java" | while read -r file; do
                echo "=== File: $file ==="
                cat "$file"
                echo
              done
            else
              echo "No test code found."
            fi
            echo 'EOF'
          } >> "$GITHUB_OUTPUT"
      - name: Generate AI Feedback
        id: ai_feedback
        run: |
          # This step sends the collected data to the OpenRouter API.
          INSTRUCTIONS=$(jq -Rs . <<'EOF'
          ${{ steps.instructions.outputs.instructions }}
          EOF
          )
          SOURCE_CODE=$(jq -Rs . <<'EOF'
          ${{ steps.source_code.outputs.source_code }}
          EOF
          )
          TEST_CODE=$(jq -Rs . <<'EOF'
          ${{ steps.test_code.outputs.test_code }}
          EOF
          )
          
          if [ -z "$INSTRUCTIONS" ] || [ -z "$SOURCE_CODE" ] || [ -z "$TEST_CODE" ]; then
            echo "Error: One or more required variables are not set."
          exit 1
          fi

          # Assigning to USER_CONTENT with variable expansion
          PAYLOAD="Please provide feedback on the following Java assignment.
          
          --- Assignment Instructions ---
          ${INSTRUCTIONS}
          
          --- Source files ---          
          ${SOURCE_CODE}
          
          --- Test files ---
          ${TEST_CODE}"
          
          JSON_CONTENT=$(jq -n \
          --argjson model "$OPENROUTER_MODEL" \
          --arg system_prompt "$SYSTEM_PROMPT" \
          --arg payload "$PAYLOAD" \
          '{
          models: $model,
          messages: [
            {role: "system", content: $system_prompt},
            {role: "user", content: $payload}
          ]
          }')
          
          echo "$JSON_CONTENT"
          
          API_RESPONSE=$(echo "$JSON_CONTENT" | curl https://openrouter.ai/api/v1/chat/completions \
          -H "Authorization: Bearer ${{ secrets.OPENROUTER_API_KEY }}" \
          -H "Content-Type: application/json" \
          -d @-)

          echo "$API_RESPONSE"

          FEEDBACK_CONTENT=$(echo "$API_RESPONSE" | jq -r '.choices[0].message.content')
          echo "feedback<<EOF" >> $GITHUB_OUTPUT
          echo "$FEEDBACK_CONTENT" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
      - name: Post Feedback as PR Comment ✍️
        uses: actions/github-script@v7
        env:
          FEEDBACK_BODY: ${{ steps.ai_feedback.outputs.feedback }}
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { owner, repo } = context.repo;
            const targetTitle = "Feedback";
            const signature = "🤖 AI Feedback";

            // Find the PR by title
            const { data: pullRequests } = await github.rest.pulls.list({
              owner,
              repo,
              state: "open",
              per_page: 100
            });

            const matchingPR = pullRequests.find(pr => pr.title.trim().toLowerCase() === targetTitle.toLowerCase());
            if (!matchingPR) {
              throw new Error(`No open pull request found with title '${targetTitle}'`);
            }

            const prNumber = matchingPR.number;

            // Get all comments on the PR
            const { data: comments } = await github.rest.issues.listComments({
              owner,
              repo,
              issue_number: prNumber,
              per_page: 100
            });

            // Find existing comment from github-actions with our signature
            const existing = comments.find(c =>
              c.user?.login === "github-actions[bot]" &&
              c.body?.includes(signature)
            );

            const timestamp = new Date().toISOString();
            const newEntry = `🕒 _Posted on ${timestamp}_\n\n${process.env.FEEDBACK_BODY}\n\n---\n`;

            if (existing) {
              const updatedBody = `${newEntry}${existing.body}`;
              await github.rest.issues.updateComment({
                owner,
                repo,
                comment_id: existing.id,
                body: updatedBody
              });
              console.log(`🔄 Updated existing comment on PR #${prNumber}`);
            } else {
              const body = `### ${signature}\n\n${newEntry}`;
              await github.rest.issues.createComment({
                owner,
                repo,
                issue_number: prNumber,
                body
              });
              console.log(`🆕 Posted new comment on PR #${prNumber}`);
            }