name: "Benchmark Report"

description: "Runs benchmarks and posts or updates a sticky PR comment with the results."

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read

jobs:
  benchmark:
    name: Benchmark
    runs-on: ubuntu-latest
    env: 
      nodeVersion: 20
      mainRef: "main"
    steps:
      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.nodeVersion }}

      # Run benchmark on main branch
      - name: Checkout main branch
        uses: actions/checkout@v4
        with:
          ref: ${{ env.mainRef }}
          path: main-source

      - name: Install dependencies (main)
        run: npm install --ignore-scripts
        working-directory: main-source

      - name: Run benchmark on main
        run: node benchmarks/runBenchmarks.js > ../results.main.csv
        working-directory: main-source

      # Run benchmark on PR branch
      - name: Checkout PR branch
        uses: actions/checkout@v4
        with:
          path: pr-source

      - name: Install dependencies (PR)
        run: npm install --ignore-scripts
        working-directory: pr-source

      - name: Run benchmark on PR branch
        run: node benchmarks/runBenchmarks.js > ../results.branch.csv
        working-directory: pr-source

      # Generate the report
      - name: Generate report
        shell: bash
        run: |
          cat results.main.csv results.branch.csv | node main-source/benchmarks/report.js >> $GITHUB_STEP_SUMMARY