background.js

// 监听扩展安装事件
chrome.runtime.onInstalled.addListener((details) => {
  console.log('Style Injector (v2.2) 已安装');
  
  // 初始化存储结构（如果不存在）
  chrome.storage.local.get(['styleRules'], (result) => {
    if (!result.styleRules) {
      chrome.storage.local.set({ styleRules: {} });
    }
  });
});

// 监听标签页更新，确保样式注入
chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (changeInfo.status === 'complete' && tab.url) {
    try {
      const url = new URL(tab.url);
      const hostname = url.hostname;
      
      chrome.storage.local.get(['styleRules'], (result) => {
        const allRules = result.styleRules || {};
        const rules = allRules[hostname];
        
        if (rules && rules.length > 0) {
          chrome.tabs.sendMessage(tabId, {
            action: 'updateStyles',
            rules: rules
          }).catch(() => {
            // 忽略错误：可能是 content script 还没加载好
          });
        }
      });
    } catch (e) {
      console.error('Error checking tab url:', e);
    }
  }
});