# GitHub Actions: 字体子集化自动化
# 当内容更新时自动提取字符并生成优化的子集字体

name: Font Subset Optimization

on:
  # 当推送到main分支且content目录有变更时触发
  push:
    branches:
      - main
    paths:
      - 'content/**'
      - 'layouts/**'

  # 允许手动触发
  workflow_dispatch:
    inputs:
      force_rebuild:
        description: '强制重新生成子集字体'
        required: false
        default: 'false'
        type: boolean

  # 可选：每周自动运行一次（检查是否需要更新）
  schedule:
    - cron: '0 2 * * 1'  # 每周一凌晨2点

# 限制同时运行的工作流数量
concurrency:
  group: font-subset-${{ github.ref }}
  cancel-in-progress: true

jobs:
  subset-fonts:
    name: Subset Fonts
    runs-on: ubuntu-latest
    timeout-minutes: 30

    # 只在主仓库上运行（fork不运行）
    if: github.repository == 'zqlit/blog'

    steps:
      # 1. 检出代码
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # 获取完整历史用于比较

      # 2. 设置Python环境
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
          cache: 'pip'  # 使用requirements.txt进行缓存

      # 3. 安装Python依赖
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install fonttools brotli

      # 4. 检查是否需要更新（可选）
      - name: Check if update needed
        id: check
        run: |
          # 检查内容文件是否有变更
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "needs_update=true" >> $GITHUB_OUTPUT
          else
            # 比较content目录的变更
            CHANGED_FILES=$(git diff --name-only HEAD~1 HEAD -- content/ layouts/ || echo "")
            if [ -n "$CHANGED_FILES" ]; then
              echo "needs_update=true" >> $GITHUB_OUTPUT
              echo "Changed files: $CHANGED_FILES"
            else
              echo "needs_update=false" >> $GITHUB_OUTPUT
              echo "No content changes detected"
            fi
          fi

      # 5. 构建Hugo站点（用于提取字符）
      - name: Build Hugo site
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        uses: peaceiris/actions-hugo@v2
        with:
          hugo-version: '0.128.2'  # 固定版本，与本地一致
          extended: true

      - name: Build
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: hugo --destination=public --minify

      # 6. 运行字体子集化脚本
      - name: Subset fonts
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: |
          python scripts/subset-font-safe.py

      # 7. 检查子集字体是否真的优化了
      - name: Verify optimization
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: |
          ORIGINAL_SIZE=$(stat -f%z themes/Ying/static/font/zql-v2.woff2 2>/dev/null || stat -c%s themes/Ying/static/font/zql-v2.woff2)
          SUBSET_SIZE=$(stat -f%z themes/Ying/static/font/zql-v2-subset.woff2 2>/dev/null || stat -c%s themes/Ying/static/font/zql-v2-subset.woff2)

          echo "Original font size: $ORIGINAL_SIZE bytes"
          echo "Subset font size: $SUBSET_SIZE bytes"

          # 检查子集字体是否真的更小
          if [ $SUBSET_SIZE -ge $ORIGINAL_SIZE ]; then
            echo "⚠️  Warning: Subset font is not smaller than original"
            echo "Skipping commit..."
            exit 0
          fi

          REDUCTION=$((ORIGINAL_SIZE - SUBSET_SIZE))
          PERCENTAGE=$((REDUCTION * 100 / ORIGINAL_SIZE))
          echo "✅ Font optimized: reduced $REDUCTION bytes ($PERCENTAGE%)"

      # 8. 提交更改（如果有优化）
      - name: Commit changes
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: |
          # 配置git
          git config --local user.email "github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"

          # 检查是否有变更
          if git diff --quiet; then
            echo "No changes to commit"
            exit 0
          fi

          # 添加变更的文件
          git add themes/Ying/static/font/zql-v2-subset.*
          git add themes/Ying/static/font/used_chars.txt

          # 提交（添加[skip ci]避免触发deploy.yml）
          git commit -m "chore: update font subset (automated) [skip ci]

          - Updated font subset based on latest content
          - Subset characters: $(wc -c < themes/Ying/static/font/used_chars.txt) chars
          - Font size: $(stat -c%s themes/Ying/static/font/zql-v2-subset.woff2 2>/dev/null || echo 'N/A') bytes"

      # 9. 推送更改
      - name: Push changes
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: |
          git push origin main

      # 10. 创建摘要
      - name: Create summary
        if: steps.check.outputs.needs_update == 'true' || github.event.inputs.force_rebuild == 'true'
        run: |
          echo "## 🔤 Font Subset Optimization" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ Font subset updated successfully!" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### 📊 Statistics" >> $GITHUB_STEP_SUMMARY
          echo "- **Characters in subset:** $(wc -c < themes/Ying/static/font/used_chars.txt)" >> $GITHUB_STEP_SUMMARY
          echo "- **Subset font size:** $(stat -c%s themes/Ying/static/font/zql-v2-subset.woff2 2>/dev/null || echo 'N/A') bytes" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### 📝 Triggered by" >> $GITHUB_STEP_SUMMARY
          echo "- Event: ${{ github.event_name }}" >> $GITHUB_STEP_SUMMARY
          echo "- Commit: ${{ github.sha }}" >> $GITHUB_STEP_SUMMARY