name: Deploy Docs

on:
  push:
    branches: [main]
  workflow_dispatch:

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

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

jobs:
  build:
    runs-on: ubuntu-22.04

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python 3.10
        uses: actions/setup-python@v5
        with:
          python-version: '3.10'
          cache: 'pip'

      - name: Install pandoc
        run: |
          wget -q https://github.com/jgm/pandoc/releases/download/2.19.2/pandoc-2.19.2-1-amd64.deb
          sudo dpkg -i pandoc-2.19.2-1-amd64.deb

      - name: Install d2lbook
        run: |
          git clone https://github.com/openmlsys/d2l-book.git
          cd d2l-book
          # Fix Python 3.10+ incompatibility: bibtex<2.0.0 depends on oset which
          # uses collections.MutableSet removed in Python 3.10.
          sed -i "s/'sphinxcontrib-bibtex<2.0.0'/'sphinxcontrib-bibtex>=2.5.0'/" setup.py
          python3 -m pip install .

      - name: Install Python dependencies
        run: python3 -m pip install -r requirements.txt sphinx-mathjax-offline

      - name: Build English HTML
        run: bash build_html.sh

      - name: Build Chinese HTML
        run: bash build_html_zh.sh

      - name: Assemble site
        run: |
          mkdir -p _site
          # English → root
          cp -r en_chapters/_build/html/* _site/
          # Chinese → /cn/
          mkdir -p _site/cn
          cp -r zh_chapters/_build/html/* _site/cn/

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

  deploy:
    needs: build
    runs-on: ubuntu-22.04
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4