name: Documentation

on:
  push:
    branches: [master]
    paths:
      - '.github/workflows/docs.yml'
      - 'docs/**'
      - 'site/**'
      - 'src-skills/**'
      - 'skills/**'
      - 'scripts/build-skill.mjs'
      - 'scripts/check-skill.mjs'
      - 'scripts/check-docs.mjs'
      - 'scripts/check-site.mjs'
      - 'scripts/lib/skill-bundle.mjs'
      - 'scripts/lib/slugify-heading.mjs'
      - 'package.json'
      - 'package-lock.json'
  pull_request:
    paths:
      - '.github/workflows/docs.yml'
      - 'docs/**'
      - 'site/**'
      - 'src-skills/**'
      - 'skills/**'
      - 'scripts/build-skill.mjs'
      - 'scripts/check-skill.mjs'
      - 'scripts/check-docs.mjs'
      - 'scripts/check-site.mjs'
      - 'scripts/lib/skill-bundle.mjs'
      - 'scripts/lib/slugify-heading.mjs'
      - 'package.json'
      - 'package-lock.json'
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm

      - name: Install dependencies
        run: npm ci

      - name: Check project
        run: npm run check

      - name: Resolve skill tree hash
        id: skill
        run: echo "tree_hash=$(git rev-parse HEAD:skills/slm-design)" >> "$GITHUB_OUTPUT"

      - name: Restore skill archive
        id: skill-cache
        uses: actions/cache@v4
        with:
          path: ${{ runner.temp }}/slm-design.zip
          key: slm-design-zip-v1-${{ steps.skill.outputs.tree_hash }}

      - name: Pack skill
        if: steps.skill-cache.outputs.cache-hit != 'true'
        run: >-
          git archive
          --format=zip
          --prefix=slm-design/
          --mtime=2000-01-01T00:00:00Z
          --output="$RUNNER_TEMP/slm-design.zip"
          "${{ steps.skill.outputs.tree_hash }}"

      - name: Verify skill archive
        run: unzip -t "$RUNNER_TEMP/slm-design.zip"

      - name: Add skill archive to Pages
        run: |
          mkdir -p site/.vitepress/dist/downloads
          cp "$RUNNER_TEMP/slm-design.zip" site/.vitepress/dist/downloads/slm-design.zip

      - name: Configure Pages
        uses: actions/configure-pages@v5

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: site/.vitepress/dist

  deploy:
    if: github.event_name != 'pull_request'
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4