name: AI Worker (Free Tier)

# Runs on contributor's fork - uses THEIR API allowances
# Gemini 2.0 Flash: 1500 req/day free
# Jules: Available to all GitHub users

on:
  pull_request:
    types: [opened, synchronize]
  issues:
    types: [labeled]

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

env:
  # Contributors set their own GEMINI_API_KEY in fork secrets
  # Free tier: 1500 requests/day, 1M tokens/min
  GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}

jobs:
  # Analyze PR with Gemini (contributor's free tier)
  gemini-review:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      
      - name: Get diff
        id: diff
        run: |
          DIFF=$(git diff origin/${{ github.base_ref }}...HEAD | head -c 50000)
          echo "diff<<EOFMARKER" >> $GITHUB_OUTPUT
          echo "$DIFF" >> $GITHUB_OUTPUT
          echo "EOFMARKER" >> $GITHUB_OUTPUT

      - name: Gemini Analysis
        if: env.GEMINI_API_KEY != ''
        id: gemini
        run: |
          # Call Gemini 2.0 Flash (free tier)
          RESPONSE=$(curl -s "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=$GEMINI_API_KEY" \
            -H 'Content-Type: application/json' \
            -d @- << 'PAYLOAD'
          {
            "contents": [{
              "parts": [{
                "text": "Review this code diff. Be concise. List: 1) Security issues 2) Bugs 3) Improvements. If none, say 'LGTM'.\n\nDiff:\n${{ steps.diff.outputs.diff }}"
              }]
            }],
            "generationConfig": {
              "temperature": 0.2,
              "maxOutputTokens": 1000
            }
          }
          PAYLOAD
          )
          
          # Extract text from response
          REVIEW=$(echo "$RESPONSE" | jq -r '.candidates[0].content.parts[0].text // "Analysis failed"')
          echo "review<<EOFMARKER" >> $GITHUB_OUTPUT
          echo "$REVIEW" >> $GITHUB_OUTPUT
          echo "EOFMARKER" >> $GITHUB_OUTPUT

      - name: Post Gemini review
        if: steps.gemini.outputs.review != ''
        uses: actions/github-script@v7
        with:
          script: |
            const review = `${{ steps.gemini.outputs.review }}`;
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `## 🤖 Gemini Analysis (Free Tier)\n\n${review}\n\n---\n_Powered by contributor's Gemini API allowance (1500 req/day free)_`
            });

  # Trigger Jules to fix issues (contributor's Copilot allowance)
  trigger-jules:
    if: github.event_name == 'issues' && github.event.label.name == 'agent:ready'
    runs-on: ubuntu-latest
    steps:
      - name: Check Jules eligibility
        id: check
        uses: actions/github-script@v7
        with:
          script: |
            // Check if this repo has Copilot coding agent enabled
            const issue = context.payload.issue;
            
            console.log(`Issue #${issue.number}: ${issue.title}`);
            console.log(`Labels: ${issue.labels.map(l => l.name).join(', ')}`);
            
            // Jules can be assigned to issues with specific labels
            const hasAgentic = issue.labels.some(l => l.name === 'agentic');
            
            return { eligible: hasAgentic, issueNumber: issue.number };

      - name: Assign to Jules
        if: steps.check.outputs.result != ''
        uses: actions/github-script@v7
        with:
          script: |
            // Trigger Jules by adding the copilot label
            // Jules will pick up the issue and create a PR
            try {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.issue.number,
                labels: ['copilot']  // This triggers Jules/Copilot coding agent
              });
              
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.issue.number,
                body: `## 🤖 Jules Activated\n\nThis issue has been assigned to GitHub Copilot coding agent (Jules).\n\nJules will:\n1. Analyze the issue\n2. Create a solution\n3. Open a PR with the fix\n\n_Using contributor's Copilot allowance_ 🆓`
              });
            } catch (e) {
              console.log('Could not assign to Jules:', e.message);
            }