name: Generate Paper PDF

on:
  push:
    branches: [main]
    paths:
      - 'paper/README.md'
  workflow_dispatch:

permissions:
  contents: write

jobs:
  generate-pdf:
    runs-on: ubuntu-latest
    container:
      image: pandoc/extra:latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Prepare markdown (strip manual TOC)
        run: |
          cd paper
          # Remove the manual TOC table between "## Table des matières" and the next "---"
          python3 -c "
          import re
          with open('README.md', 'r', encoding='utf-8') as f:
              content = f.read()
          content = re.sub(
              r'## Table des matières\n+\|.*?\n\n---',
              '---',
              content,
              flags=re.DOTALL
          )
          with open('paper_clean.md', 'w', encoding='utf-8') as f:
              f.write(content)
          "

      - name: Create metadata
        run: |
          cat > paper/metadata.yaml << 'YAML'
          ---
          title: "XERB0XI0N"
          subtitle: "Une infrastructure pour la souveraineté humaine et la civilisation galactique"
          author: "José Gasser (J0bot)"
          date: "Mars 2026"
          lang: fr
          fontsize: 11pt
          documentclass: article
          geometry:
            - a4paper
            - margin=2.5cm
          mainfont: "DejaVu Serif"
          sansfont: "DejaVu Sans"
          monofont: "DejaVu Sans Mono"
          ---
          YAML

      - name: Generate PDF
        run: |
          cd paper
          pandoc metadata.yaml paper_clean.md \
            -o xerboxion_paper.pdf \
            --pdf-engine=xelatex \
            --toc \
            --toc-depth=3 \
            --highlight-style=tango

      - name: Cleanup temp files
        run: |
          rm -f paper/paper_clean.md paper/metadata.yaml

      - name: Commit PDF
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add paper/xerboxion_paper.pdf
          if git diff --cached --quiet; then
            echo "No changes to PDF"
          else
            git commit -m "Auto-generate xerboxion_paper.pdf from README.md"
            git push
          fi