thgtoa/.github/workflows/build.yml

# 1. Push to main → build.yml runs automatically → note the run ID
# 2. Manually trigger sign.yml with that build run ID → note the sign run ID
# 3. Manually trigger release.yml with: version=v1.2.5, sign_run_id=<id>
# 4. Manually trigger changelog.yml with: version=v1.2.5

name: 📖 Build PDFs

on:
  workflow_dispatch:
    inputs:
      build_mode:
        description: 'PDF build mode'
        required: true
        default: 'both'
        type: choice
        options:
          - light
          - dark
          - both
  push:
    branches:
      - main
    paths:
      - "docs/**"
      - "mkdocs.yml"
      - "scripts/**"
      - ".github/workflows/build.yml"

permissions:
  contents: read

jobs:
  build:
    name: Build PDFs
    runs-on: ubuntu-latest
    outputs:
      build_mode: ${{ steps.mode.outputs.build_mode }}
      run_id:     ${{ github.run_id }}

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

      - name: 🐍 Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.13"

      - name: 📦 Install Python dependencies
        run: pip install "mkdocs-material[imaging]" pillow numpy

      - name: 🖼️ Install poppler and qpdf
        run: |
          sudo apt-get update -qq
          sudo apt-get install -y poppler-utils qpdf

      - name: Setup Chrome
        uses: browser-actions/setup-chrome@v2
        with:
          chrome-version: 120
          install-dependencies: true
          install-chromedriver: true

      - name: 🖨️ Resolve build mode
        id: mode
        run: |
          MODE="${{ inputs.build_mode || 'both' }}"
          echo "build_mode=$MODE" >> $GITHUB_OUTPUT
          echo "Building in mode: $MODE"

      - name: 🖨️ Build PDFs
        env:
          CI: true
        run: python scripts/build_guide_pdf.py --${{ steps.mode.outputs.build_mode }}

      - name: 📤 Upload PDF artifacts
        uses: actions/upload-artifact@v4
        with:
          name: pdfs
          path: |
            export/thgtoa.pdf
            export/thgtoa-dark.pdf
          if-no-files-found: warn
          retention-days: 90
          compression-level: 0