name: Roadmap explorer

on:
  push:
    branches: [master]
    paths:
      - README.md
      - "site/**"
      - .github/workflows/pages.yml
      - .github/scripts/next-version.sh
  pull_request:
    paths:
      - README.md
      - "site/**"
      - .github/workflows/pages.yml
      - .github/scripts/next-version.sh
  workflow_dispatch:
    inputs:
      bump:
        description: "Version bump: auto releases a patch only if the map changed; minor/major always release"
        type: choice
        options: [auto, minor, major]
        default: auto

permissions:
  contents: read

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  # Builds on master queue instead of cancelling, so two releases never pick the same version.
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

jobs:
  build:
    name: Test and build
    # Pinned runner and Playwright keep the rendering stable, so the map fingerprint only changes with the map.
    runs-on: ubuntu-24.04
    outputs:
      release: ${{ steps.version.outputs.release }}
      version: ${{ steps.version.outputs.version }}
      previous: ${{ steps.version.outputs.previous }}
      fingerprint: ${{ steps.fingerprint.outputs.sha256 }}
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v4
        with:
          node-version: 22

      - name: Test the README parser and map layout
        run: node --test site/parser.test.mjs

      - name: Warn about README sections that are not on the map
        run: node site/tools/coverage.mjs

      - name: Assemble the site
        run: |
          mkdir _site
          cp site/*.html site/*.css site/*.js site/map.json README.md _site/
          cp -r site/fonts site/assets _site/

      - name: Install Chromium
        run: |
          npm install --no-save --no-package-lock playwright@1.64.0
          npx playwright install --with-deps chromium

      - name: Fingerprint the map
        id: fingerprint
        # Rendered before build.json exists, so the revision line is not part of the fingerprint.
        run: |
          node site/tools/render.mjs _site / fingerprint
          echo "sha256=$(sha256sum fingerprint/Embedded-Engineering-Roadmap.png | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"

      - name: Decide the version
        id: version
        env:
          FINGERPRINT: ${{ steps.fingerprint.outputs.sha256 }}
          BUMP: ${{ inputs.bump || 'auto' }}
          GH_TOKEN: ${{ github.token }}
          GH_REPO: ${{ github.repository }}
        run: .github/scripts/next-version.sh

      - name: Render the roadmap to PDF and PNG
        env:
          VERSION: ${{ steps.version.outputs.version }}
          DATE: ${{ steps.version.outputs.date }}
        run: |
          node -e 'console.log(JSON.stringify({ version: process.env.VERSION, date: process.env.DATE }))' > _site/build.json
          cat _site/build.json
          node site/tools/render.mjs _site / _site

      - uses: actions/upload-artifact@v4
        with:
          name: roadmap-render
          path: |
            _site/Embedded-Engineering-Roadmap.pdf
            _site/Embedded-Engineering-Roadmap.png
          if-no-files-found: error

      - uses: actions/upload-pages-artifact@v3
        with:
          path: _site

  release:
    name: Publish release
    if: github.event_name != 'pull_request' && github.ref == 'refs/heads/master' && needs.build.outputs.release == 'true'
    needs: build
    runs-on: ubuntu-24.04
    permissions:
      contents: write
    steps:
      - uses: actions/download-artifact@v4
        with:
          name: roadmap-render

      - name: Create the release with the PDF and PNG
        env:
          GH_TOKEN: ${{ github.token }}
          GH_REPO: ${{ github.repository }}
          VERSION: ${{ needs.build.outputs.version }}
          PREVIOUS: ${{ needs.build.outputs.previous }}
          FINGERPRINT: ${{ needs.build.outputs.fingerprint }}
        run: |
          gh api "repos/$GH_REPO/releases/generate-notes" -f tag_name="$VERSION" -f target_commitish="$GITHUB_SHA" \
            -f previous_tag_name="$PREVIOUS" --jq .body > notes.md
          # The next build compares its map with this fingerprint to decide whether a new patch release is due.
          printf '\n<!-- map-fingerprint: %s -->\n' "$FINGERPRINT" >> notes.md
          gh release create "$VERSION" Embedded-Engineering-Roadmap.pdf Embedded-Engineering-Roadmap.png \
            --target "$GITHUB_SHA" --title "$VERSION" --notes-file notes.md

  deploy:
    name: Deploy to GitHub Pages
    if: >-
      !cancelled() && github.event_name != 'pull_request' && github.ref == 'refs/heads/master'
      && needs.build.result == 'success' && needs.release.result != 'failure'
    needs: [build, release]
    runs-on: ubuntu-24.04
    permissions:
      pages: write
      id-token: write
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - id: deployment
        uses: actions/deploy-pages@v4