name: Free Tier AI Analysis

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

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

jobs:
  # Groq - 14,400 requests/day FREE (Llama 3, Mixtral)
  groq-analysis:
    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: |
          git diff origin/${{ github.base_ref }}...HEAD > /tmp/diff.txt
          head -c 30000 /tmp/diff.txt > /tmp/diff_truncated.txt
          
      - name: Groq Analysis
        if: env.GROQ_API_KEY != ''
        env:
          GROQ_API_KEY: ${{ secrets.GROQ_API_KEY }}
        run: |
          # Groq is FAST and FREE (14,400 req/day)
          DIFF=$(cat /tmp/diff_truncated.txt | jq -Rs .)
          
          curl -s https://api.groq.com/openai/v1/chat/completions \
            -H "Authorization: Bearer $GROQ_API_KEY" \
            -H "Content-Type: application/json" \
            -d "{
              \"model\": \"llama-3.3-70b-versatile\",
              \"messages\": [{
                \"role\": \"user\",
                \"content\": \"Review this diff for security issues, bugs, and code smells. Be very concise. Output as: SECURITY: x issues, BUGS: x issues, SMELLS: x issues. Then list critical items only.\n\nDiff:\n${DIFF}\"
              }],
              \"temperature\": 0.1,
              \"max_tokens\": 500
            }" | jq -r '.choices[0].message.content' > /tmp/groq_review.txt
            
          cat /tmp/groq_review.txt

  # Mistral - Free tier available
  mistral-analysis:
    if: github.event_name == 'pull_request' && vars.MISTRAL_API_KEY != ''
    runs-on: ubuntu-latest
    continue-on-error: true
    steps:
      - uses: actions/checkout@v4
      - name: Mistral Code Review
        env:
          MISTRAL_API_KEY: ${{ secrets.MISTRAL_API_KEY }}
        run: |
          echo "Mistral analysis would run here"
          # Similar pattern to Groq

  # Cohere - 1000 req/month free (good for classification)
  cohere-classify:
    if: github.event_name == 'issues'
    runs-on: ubuntu-latest
    continue-on-error: true
    steps:
      - name: Classify Issue
        if: env.COHERE_API_KEY != ''
        env:
          COHERE_API_KEY: ${{ secrets.COHERE_API_KEY }}
        run: |
          # Use Cohere to classify issue type/priority
          TITLE="${{ github.event.issue.title }}"
          BODY="${{ github.event.issue.body }}"
          
          curl -s https://api.cohere.ai/v1/classify \
            -H "Authorization: Bearer $COHERE_API_KEY" \
            -H "Content-Type: application/json" \
            -d "{
              \"inputs\": [\"$TITLE\"],
              \"examples\": [
                {\"text\": \"App crashes on login\", \"label\": \"bug\"},
                {\"text\": \"Add dark mode\", \"label\": \"feature\"},
                {\"text\": \"SQL injection in auth\", \"label\": \"security\"},
                {\"text\": \"Slow page load\", \"label\": \"performance\"}
              ]
            }" | jq '.classifications[0].prediction'

  # Cloudflare Workers AI - 10,000 neurons/day FREE
  cloudflare-ai:
    if: github.event_name == 'pull_request' && vars.CF_ACCOUNT_ID != ''
    runs-on: ubuntu-latest
    continue-on-error: true
    steps:
      - name: Cloudflare AI Analysis
        env:
          CF_API_TOKEN: ${{ secrets.CF_API_TOKEN }}
          CF_ACCOUNT_ID: ${{ vars.CF_ACCOUNT_ID }}
        run: |
          # Cloudflare Workers AI - runs at the edge
          echo "Cloudflare AI analysis would run here"
          # @cf/meta/llama-3-8b-instruct is free

  # Aggregate results and create summary
  aggregate:
    needs: [groq-analysis]
    if: always() && github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - name: Create Summary
        uses: actions/github-script@v7
        with:
          script: |
            const summary = `## 🤖 Free Tier AI Analysis
            
            Multiple AI services analyzed this PR:
            
            | Service | Status | Free Tier |
            |---------|--------|-----------|
            | Groq (Llama 3) | ${{ needs.groq-analysis.result }} | 14,400 req/day |
            | Mistral | skipped | 1M tokens/month |
            | Cohere | skipped | 1000 req/month |
            | Cloudflare AI | skipped | 10K neurons/day |
            
            ---
            _Add API keys to your fork secrets to enable more services._
            _All analysis runs on contributor's free tier allowance._
            `;
            
            // Only comment if at least one analysis ran
            if ('${{ needs.groq-analysis.result }}' !== 'skipped') {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: summary
              });
            }