name: Build & Test

on:
  push:
    branches:
      - main
      - 3.x
      - 2.x
    # Skip on docs-only / metadata-only pushes. Keep this list in SYNC with
    # build-and-test-skip.yml - that companion workflow reports success for
    # the same required-check names when this one is skipped, otherwise PRs
    # that only touch docs would hang forever on "Waiting for status to be
    # reported" (GitHub's well-known paths-filter + required-check gotcha).
    paths-ignore:
      - '**/*.md'
      - 'demos/**'
      - 'website/**'
      - 'LICENSE'
      - '.gitattributes'
      - '.editorconfig'
      - '.prettierrc'
      - '.nvmrc'
      - '.gitignore'
      - '.husky/**'
      - 'osv-scanner.toml'
      - '.github/ISSUE_TEMPLATE.md'
      - '.github/PULL_REQUEST_TEMPLATE.md'
      - '.github/FUNDING.yml'
      - '.github/dependabot.yml'
      - '.github/workflows/codeql-analysis.yml'
      - '.github/workflows/dependency-review.yml'
      - '.github/workflows/fuzz.yml'
      - '.github/workflows/scorecard.yml'
      - '.github/workflows/sign-release.yml'
      - '.github/workflows/slsa-provenance.yml'
      - '.github/workflows/legacy-browsers.yml'
  pull_request:
    paths-ignore:
      - '**/*.md'
      - 'demos/**'
      - 'website/**'
      - 'LICENSE'
      - '.gitattributes'
      - '.editorconfig'
      - '.prettierrc'
      - '.nvmrc'
      - '.gitignore'
      - '.husky/**'
      - 'osv-scanner.toml'
      - '.github/ISSUE_TEMPLATE.md'
      - '.github/PULL_REQUEST_TEMPLATE.md'
      - '.github/FUNDING.yml'
      - '.github/dependabot.yml'
      - '.github/workflows/codeql-analysis.yml'
      - '.github/workflows/dependency-review.yml'
      - '.github/workflows/fuzz.yml'
      - '.github/workflows/scorecard.yml'
      - '.github/workflows/sign-release.yml'
      - '.github/workflows/slsa-provenance.yml'
      - '.github/workflows/legacy-browsers.yml'

permissions:
  contents: read

# Cancel superseded runs on the same PR to save minutes on rapid pushes.
# Pushes to protected branches are NOT cancelled - we want full CI history
# for every merged commit.
concurrency:
  group: build-test-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

jobs:
  # Fast feedback: lint, build, dist-sync and jsdom across all supported
  # Node versions. The full three-engine browser suite runs once, on the
  # primary Node version only - browser behaviour is Node-independent, so
  # repeating it per Node entry added cost without coverage.
  # Runs on every push and every PR.
  install:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        node-version: [20.x, 22.x, 24.x, 25.x, 26.x]

    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Setup Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version: ${{ matrix.node-version }}
          cache: npm

      - name: Install Dependencies
        run: npm ci --ignore-scripts

      # All three engines, but only on the primary Node version (the same
      # one the browser-matrix job uses). DOMPurify's security posture
      # depends on per-engine HTML parser behaviour being exercised on
      # every PR - but the browsers don't care which Node drives them, so
      # installing and running 3 engines x 5 Node versions repeated the
      # same suite 15 times. This gate keeps the full per-engine coverage
      # once per PR and drops the 12 redundant runs.
      - name: Install Playwright Browsers
        if: matrix.node-version == '25.x'
        run: ./node_modules/.bin/playwright install --with-deps chromium firefox webkit

      - name: Build
        run: npm run build
        
      - name: Verify dist/ matches src/
        run: |
          if ! git diff --quiet dist/; then
            echo "::error::dist/ is out of sync with src/. The husky pre-commit hook should have rebuilt dist/ before commit. Did you commit without running 'npm install' first (which wires up the hook), or bypass hooks with --no-verify?"
            echo "--- dist/ diff ---"
            git diff --stat dist/
            git diff dist/ | head -100
            exit 1
          fi
          echo "dist/ matches src/ ✓"

      - name: Lint
        run: npm run lint

      - name: Test (jsdom + full browser matrix)
        if: matrix.node-version == '25.x'
        run: npm run test:ci

      - name: Test (jsdom)
        if: matrix.node-version != '25.x'
        run: npm run test:jsdom

      - name: Upload Playwright report
        if: failure() && matrix.node-version == '25.x'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: playwright-report-node-${{ matrix.node-version }}
          path: playwright-report/
          retention-days: 7

      - name: Verify TypeScript
        run: npm run verify-typescript

  # Browser diversity: chromium + firefox + webkit across Ubuntu, macOS, and
  # Windows. Catches OS-specific rendering quirks (e.g. macOS WebKit ≈ real
  # Safari engine, Windows font shaping, Linux-specific parser paths).
  #
  # Only runs on release branches (main, 2.x, 3.x) to conserve runner minutes.
  # PRs get full three-engine coverage on a single Node version from the
  # "install" job above, which is sufficient for catching regressions.
  browser-matrix:
    if: github.event_name == 'push'
    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]

    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Setup Node.js 25.x
        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version: 25.x
          cache: npm

      - name: Install Dependencies
        run: npm ci --ignore-scripts

      - name: Install Playwright Browsers (Linux)
        if: runner.os == 'Linux'
        run: ./node_modules/.bin/playwright install --with-deps chromium firefox webkit

      - name: Install Playwright Browsers (macOS / Windows)
        if: runner.os != 'Linux'
        run: ./node_modules/.bin/playwright install chromium firefox webkit

      - name: Build
        run: npm run build

      - name: Run browser tests (all engines)
        run: npm run test:browser

      - name: Upload Playwright report
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: playwright-report-${{ matrix.os }}
          path: playwright-report/
          retention-days: 7
