name: Docs

on:
  push:
    branches: [main]
    paths:
      - "docs/**"
      - "blume.config.ts"
      - "package.json"
      - "package-lock.json"
      - ".github/workflows/docs.yml"
  pull_request:
    paths:
      - "docs/**"
      - "blume.config.ts"
      - "package.json"
      - "package-lock.json"
      - ".github/workflows/docs.yml"
  workflow_dispatch:

# GITHUB_TOKEN permissions for Pages deployment via OIDC.
permissions:
  contents: read
  pages: write
  id-token: write

# Serialize deployments; never cancel a running one mid-publish.
concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    name: Build site
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Full history so Blume's `lastModified` can read per-page commit dates.
          fetch-depth: 0

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          # Blume requires Node 22.12 or newer.
          node-version: "22.x"
          cache: npm

      - name: Install dependencies
        run: npm ci

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

      - name: Build
        run: npm run build
        env:
          # Lifts the GitHub API rate limit for build-time repo metadata.
          GITHUB_TOKEN: ${{ github.token }}

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

  deploy:
    name: Deploy to Pages
    # Deploy only from main; pull requests build as a check and stop there.
    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
        id: deployment
        uses: actions/deploy-pages@v4