name: docs-mdbook

on:
  push:
    branches:
      - main
  pull_request:
  workflow_dispatch:

permissions:
  contents: read

concurrency:
  group: mdbook-${{ github.ref }}
  cancel-in-progress: true

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

      - name: Setup mdBook
        uses: peaceiris/actions-mdbook@v2
        with:
          mdbook-version: latest

      - name: Build book
        run: mdbook build docs/book

      - name: Upload book artifact
        uses: actions/upload-artifact@v4
        with:
          name: mdbook-site
          path: ./book
          if-no-files-found: error

  deploy:
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    needs: build
    permissions:
      contents: write
    runs-on: ubuntu-latest
    steps:
      - name: Download book artifact
        uses: actions/download-artifact@v4
        with:
          name: mdbook-site
          path: ./book

      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v4
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./book