background.js

/**
 * ChatGPT Web Accelerator - Background Service Worker
 * 
 * Dynamically enables/disables the action button and popup depending on the URL
 * of the tab, ensuring it only triggers and is clickable on target ChatGPT pages.
 */

const TARGET_DOMAINS = [
  'chatgpt.com',
  'chat.openai.com'
];

/**
 * Checks if the URL matches target domains.
 * @param {string} urlStr 
 * @returns {boolean}
 */
function isTargetUrl(urlStr) {
  if (!urlStr) return false;
  try {
    const url = new URL(urlStr);
    // Check if hostname matches exactly or ends with target domain
    return TARGET_DOMAINS.some(domain => 
      url.hostname === domain || url.hostname.endsWith('.' + domain)
    );
  } catch (e) {
    return false;
  }
}

/**
 * Updates the action and popup configuration for a specific tab.
 * @param {number} tabId 
 * @param {string} url 
 */
function updateTabAction(tabId, url) {
  if (isTargetUrl(url)) {
    chrome.action.enable(tabId, () => {
      // Ignore errors if the tab was closed in the meantime
      if (chrome.runtime.lastError) return;
      chrome.action.setPopup({ tabId: tabId, popup: 'popup.html' });
    });
  } else {
    chrome.action.disable(tabId, () => {
      // Ignore errors if the tab was closed in the meantime
      if (chrome.runtime.lastError) return;
      chrome.action.setPopup({ tabId: tabId, popup: '' });
    });
  }
}

// 1. Listen for tab updates (e.g. navigation, URL changes)
chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  // If the tab contains a URL, check and update
  if (tab && tab.url) {
    updateTabAction(tabId, tab.url);
  }
});

// 2. Listen for tab activation (e.g. switching tabs)
chrome.tabs.onActivated.addListener((activeInfo) => {
  chrome.tabs.get(activeInfo.tabId, (tab) => {
    if (chrome.runtime.lastError) return;
    if (tab && tab.url) {
      updateTabAction(activeInfo.tabId, tab.url);
    }
  });
});

// 3. Initialize all existing tabs on startup/install
chrome.runtime.onInstalled.addListener(() => {
  chrome.tabs.query({}, (tabs) => {
    if (chrome.runtime.lastError) return;
    tabs.forEach((tab) => {
      if (tab.id && tab.url) {
        updateTabAction(tab.id, tab.url);
      }
    });
  });
});