name: AI PR Review

on:
  pull_request:
    types: [opened, synchronize]

jobs:
  ai-review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get PR diff
        id: diff
        run: |
          git diff origin/${{ github.base_ref }}...HEAD > /tmp/pr.diff
          echo "diff_size=$(wc -c < /tmp/pr.diff)" >> $GITHUB_OUTPUT

      - name: AI Code Review
        if: steps.diff.outputs.diff_size < 100000
        env:
          OPENAI_API_KEY: ${{ secrets.WP_AI_API_KEY }}
          OPENAI_BASE_URL: ${{ secrets.WP_AI_BASE_URL }}
        run: |
          curl -s ${{ secrets.WP_AI_BASE_URL || 'https://openrouter.ai/api/v1' }}/chat/completions \
            -H "Authorization: Bearer ${{ secrets.WP_AI_API_KEY }}" \
            -H "Content-Type: application/json" \
            -d '{
              "model": "${{ secrets.WP_AI_MODEL || 'openai/gpt-4o' }}",
              "messages": [
                {"role": "system", "content": "Review this PR diff for bugs, security issues, AI hallucinations, and maintainability problems. Output issues with file:line references."},
                {"role": "user", "content": "'"$(cat /tmp/pr.diff)"'"}
              ]
            }' > /tmp/ai_review.json

      - name: Post Review Comment
        if: steps.diff.outputs.diff_size < 100000
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const review = JSON.parse(fs.readFileSync('/tmp/ai_review.json', 'utf8'));
            const content = review.choices?.[0]?.message?.content || 'AI review unavailable (check API key)';
            const comment = `## 🤖 AI Code Review\n\n${content}`;
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: comment
            });