name: Preview Performance Regression Gate

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
    paths:
      - 'code/**'
      - 'csv_files/**'
      - 'logs/perf/theme_preview_warm_baseline.json'
      - '.github/workflows/preview-perf-ci.yml'

jobs:
  preview-perf:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    env:
      PYTHONUNBUFFERED: '1'
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
      - name: Launch app (background)
        run: |
          python -m uvicorn code.web.app:app --host 0.0.0.0 --port 8080 &
          echo $! > uvicorn.pid
          # simple wait
          sleep 5
      - name: Run preview performance CI check
        run: |
          python -m code.scripts.preview_perf_ci_check --url http://localhost:8080 --baseline logs/perf/theme_preview_warm_baseline.json --p95-threshold 5
      - name: Upload candidate artifact
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: preview-perf-candidate
          path: logs/perf/theme_preview_ci_candidate.json
      - name: Stop app
        if: always()
        run: |
          if [ -f uvicorn.pid ]; then kill $(cat uvicorn.pid) || true; fi