name: Deploy Docs

on:
  pull_request:
    types:
      - closed

jobs:
  deploy:
    if: github.event.pull_request.merged == true
    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: Deploy to GitHub Pages
        run: |
          git clone https://github.com/openmlsys/openmlsys.github.io.git

          # English → root (default language)
          cp -r openmlsys-zh/en_chapters/_build/html/* openmlsys.github.io/docs/

          # Chinese → /cn/ subdirectory
          mkdir -p openmlsys.github.io/docs/cn
          cp -r openmlsys-zh/zh_chapters/_build/html/* openmlsys.github.io/docs/cn/

          cd openmlsys.github.io
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add .
          git commit -m "deploy: update docs (en+zh) from openmlsys-zh@${{ github.sha }}"
          git push