name: Deploy Documentation

on:
  push:
    branches:
      - main
    paths:
      - "docs/**"
      - "website/**"
      - "tools/build-docs.mjs"
      - ".github/workflows/docs.yaml"
  workflow_dispatch:

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

concurrency:
  group: "pages"
  # No big win in setting this to true — risk of cancelling a deploy mid-flight.
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          # Full history needed for Starlight's lastUpdated timestamps (git log)
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version-file: ".nvmrc"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Build documentation
        env:
          # Override site URL from GitHub repo variable if set
          # Otherwise, astro.config.mjs will compute from GITHUB_REPOSITORY
          SITE_URL: ${{ vars.SITE_URL }}
        run: npm run docs:build

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

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