name: Daily Trends Factory

on:
  schedule:
    # 每天 UTC 18:00 运行 (北京时间凌晨 02:00)
    - cron: '0 18 * * *'
  workflow_dispatch: 

permissions:
  contents: write

jobs:
  update-trends:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.10'

      - name: Execute Trends Engine
        run: python scripts/fetch_trends.py

      - name: Commit and Push
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          
          git add data/keywords/
          
          # 防御机制：如果没有新数据，就静默退出，不产生空提交
          if git diff --staged --quiet; then
            echo "No changes, skipping."
            exit 0
          fi
          
          # 策略：放弃危险的 amend 强制覆盖，采用带日期的标准安全提交
          git commit -m "chore(data): 🤖 自动机兵：刷新全战区热点词库 [$(date +'%Y-%m-%d')]"
          git push origin main