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'
      - '.prettierignore'
      - '.prettierrc'
      - '.nvmrc'
      - '.gitignore'
      - '.husky/**'
      - '.pre-commit-config.yaml'
      - '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'
  pull_request:
    paths-ignore:
      - '**/*.md'
      - 'demos/**'
      - 'website/**'
      - 'LICENSE'
      - '.gitattributes'
      - '.editorconfig'
      - '.prettierignore'
      - '.prettierrc'
      - '.nvmrc'
      - '.gitignore'
      - '.husky/**'
      - '.pre-commit-config.yaml'
      - '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'

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# Cancel superseded runs on the same PR to save minutes on rapid pushes.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, jsdom, chromium-only browser test across Node versions.
  # 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@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Setup Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: ${{ matrix.node-version }}
          cache: npm

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

      # All three engines - test:ci runs the full browser matrix (no
      # --project flag, unlike local `npm test`). DOMPurify's security
      # posture depends on per-engine HTML parser behaviour being exercised,
      # so this coverage is kept on every PR despite the download cost.
      - name: Install Playwright Browsers
        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
        run: npm run test:ci

      - name: Upload Playwright report
        if: failure()
        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 chromium-only coverage 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@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
        with:
          egress-policy: audit

      - name: Checkout
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Setup Node.js 25.x
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        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
