name: Build Performance

on:
  # Note! you can't safely use "pull_request_target" here
  # This workflow is mostly useful for "internal PRs"
  # External PRs won't be able to post a PR comment
  # See https://github.com/preactjs/compressed-size-action/issues/54
  # See https://securitylab.github.com/research/github-actions-preventing-pwn-requests
  pull_request:
    branches:
      - main
      - docusaurus-v**
    paths:
      - .github/workflows/build-perf.yml
      - package.json
      - yarn.lock
      - packages/**
      - website/**
      - '!website/docs/**'

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  # Posts a PR comment with build size differences from PR vs main branches
  build-size:
    permissions:
      checks: write # for preactjs/compressed-size-action to create and update the checks
      contents: read # for actions/checkout to fetch code
      issues: write # for preactjs/compressed-size-action to create comments
      pull-requests: write # for preactjs/compressed-size-action to write a PR review
    name: Build Size Report
    timeout-minutes: 30
    runs-on: ubuntu-latest
    strategy:
      matrix:
        DOCUSAURUS_INFRA: ['SLOWER', 'FASTER']
    steps:
      - name: Checkout
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
      - name: Set up Node
        uses: actions/setup-node@1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a # v4.2.0
        with:
          node-version: lts/*
          cache: yarn
      - name: Track build size changes
        uses: preactjs/compressed-size-action@946a292cd35bd1088e0d7eb92b69d1a8d5b5d76a # v2
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          build-script: build:website:fast
          clean-script: clear:website # see https://github.com/facebook/docusaurus/pull/6838
          pattern: '{website/build/assets/js/main*js,website/build/assets/js/runtime~main*js,website/build/assets/css/styles*css,website/.docusaurus/globalData.json,website/.docusaurus/registry.js,website/.docusaurus/routes.js,website/.docusaurus/routesChunkNames.json,website/.docusaurus/site-metadata.json,website/.docusaurus/codeTranslations.json,website/.docusaurus/i18n.json,website/.docusaurus/docusaurus.config.mjs,website/build/index.html,website/build/docs.html,website/build/docs/**/*.html,website/build/blog.html,website/build/blog/**/*.html}'
          # HTML files: exclude versioned docs pages, tags pages, html redirect files
          exclude: '{website/build/docs/?.?.?/**/*.html,website/build/docs/next/**/*.html,website/build/blog/tags/**/*.html,**/*.html.html}'
          strip-hash: '\.([^;]\w{7})\.'
          minimum-change-threshold: 30
          compression: none
          comment-key: DOCUSAURUS_INFRA_${{ matrix.DOCUSAURUS_INFRA }}
        env:
          DOCUSAURUS_SLOWER: ${{ matrix.DOCUSAURUS_INFRA == 'SLOWER' && 'true' || 'false'  }}

  # Ensures build times stay under reasonable thresholds
  build-time:
    name: Build Time Perf
    timeout-minutes: 30
    runs-on: ubuntu-latest
    strategy:
      matrix:
        DOCUSAURUS_INFRA: ['SLOWER', 'FASTER']
    steps:
      - name: Checkout
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
      - name: Set up Node
        uses: actions/setup-node@1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a # v4.2.0
        with:
          node-version: lts/*
          cache: yarn
      - name: Installation
        run: yarn || yarn || yarn

      # Ensure build with a cold cache does not increase too much
      - name: Build (cold cache)
        run: yarn build:website:fast
        timeout-minutes: ${{ matrix.DOCUSAURUS_INFRA == 'SLOWER' && 3 || 2  }}
        env:
          DOCUSAURUS_SLOWER: ${{ matrix.DOCUSAURUS_INFRA == 'SLOWER' && 'true' || 'false'  }}

      # Ensure build with a warm cache does not increase too much
      - name: Build (warm cache)
        run: yarn build:website:fast
        # Temporary: upper value for Rspack until incremental cache works better
        timeout-minutes: ${{ matrix.DOCUSAURUS_INFRA == 'SLOWER' && 1 || 2  }}
        env:
          DOCUSAURUS_SLOWER: ${{ matrix.DOCUSAURUS_INFRA == 'SLOWER' && 'true' || 'false'  }}

    # TODO post a GitHub comment with build with perf warnings?