background.js

// 2025 Security: Proper service worker implementation
chrome.runtime.onInstalled.addListener(() => {
  console.log("CodeRush Extension Installed - 2025 Edition!");
});

// Listener for triggered alarms (reminders)
chrome.alarms.onAlarm.addListener((alarm) => {
  // Security: Validate alarm data
  if (!alarm || !alarm.name) {
    console.error("Invalid alarm data received");
    return;
  }

  chrome.notifications.create(alarm.name, {
    type: "basic",
    iconUrl: "/src/assets/icon128.png",
    title: "CodeRush Reminder",
    message: `Contest "${alarm.name}" is starting soon!`,
    priority: 2,
    requireInteraction: true
  });
});

// 2025 Security: Proper message handling without direct fetch
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
  // Security: Validate request structure
  if (!request || typeof request.action !== 'string') {
    sendResponse({ success: false, error: "Invalid request format" });
    return;
  }

  if (request.action === "setReminder") {
    const { contestName, reminderTime } = request;
    
    // Security: Input validation
    if (!contestName || typeof contestName !== 'string' || contestName.length > 100) {
      sendResponse({ success: false, error: "Invalid contest name" });
      return;
    }
    
    if (!reminderTime || typeof reminderTime !== 'number' || reminderTime <= Date.now()) {
      sendResponse({ success: false, error: "Invalid reminder time" });
      return;
    }
    
    try {
      chrome.alarms.create(contestName, { when: reminderTime });
      chrome.storage.local.set({ [contestName]: reminderTime }, () => {
        if (chrome.runtime.lastError) {
          sendResponse({ success: false, error: chrome.runtime.lastError.message });
        } else {
          sendResponse({ success: true });
        }
      });
    } catch (error) {
      sendResponse({ success: false, error: "Failed to set reminder" });
    }
    
    return true;
  }
  
  if (request.action === "clearReminder") {
    const { contestName } = request;
    
    if (!contestName || typeof contestName !== 'string') {
      sendResponse({ success: false, error: "Invalid contest name" });
      return;
    }
    
    try {
      chrome.alarms.clear(contestName);
      chrome.storage.local.remove(contestName, () => {
        sendResponse({ success: true });
      });
    } catch (error) {
      sendResponse({ success: false, error: "Failed to clear reminder" });
    }
    
    return true;
  }
  
  // Default: Unknown action
  sendResponse({ success: false, error: "Unknown action" });
});