background.ts

export default defineBackground(() => {
  const injectContentToTab = async (tab: chrome.tabs.Tab): Promise<void> => {
    // Skip if URL is undefined
    if (!tab.url) {
      return;
    }

    // Skip if tab is discarded
    if (tab.discarded) {
      return;
    }

    // Skip if tab ID is undefined
    if (tab.id === undefined) {
      return;
    }

    // Skip if not a GitHub URL
    if (!tab.url.startsWith('https://github.com/')) {
      return;
    }

    try {
      const manifest = chrome.runtime.getManifest();

      // Inject CSS
      if (manifest.content_scripts?.[0]?.css) {
        await chrome.scripting.insertCSS({
          target: { tabId: tab.id },
          files: manifest.content_scripts[0].css,
        });
      }

      // Inject JavaScript
      if (manifest.content_scripts?.[0]?.js) {
        await chrome.scripting.executeScript({
          target: { tabId: tab.id },
          files: manifest.content_scripts[0].js,
        });
      }
    } catch (error) {
      console.error('Error injecting content script:', error);
    }
  };

  // Update extension content for tabs
  chrome.tabs.query({}, async (tabs: chrome.tabs.Tab[]) => {
    for (const tab of tabs) {
      try {
        await injectContentToTab(tab);
      } catch (e) {
        console.error(e);
      }
    }
  });
});