const readline = require('readline');

// Create the interface
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

// Menu options
const menuOptions = [
  { id: 1, name: 'View Profile' },
  { id: 2, name: 'Edit Settings' },
  { id: 3, name: 'Check Messages' },
  { id: 4, name: 'Log Out' },
  { id: 5, name: 'Exit' }
];

// Current user data (simulated)
let userData = {
  username: 'johndoe',
  email: 'john@example.com',
  messages: [
    { id: 1, from: 'admin', subject: 'Welcome!', read: false },
    { id: 2, from: 'support', subject: 'Your ticket #1234', read: true }
  ],
  settings: {
    theme: 'light',
    notifications: true,
    language: 'en'
  }
};

// Display the menu
function displayMenu() {
  console.log('\n===== MAIN MENU =====');
  menuOptions.forEach(option => {
    console.log(`${option.id}. ${option.name}`);
  });
  console.log('====================');
}

// Process the selected option
function processOption(option) {
  const selectedOption = menuOptions.find(item => item.id === parseInt(option));
  
  if (!selectedOption) {
    console.log('Invalid option. Please try again.');
    return promptUser();
  }
  
  switch(selectedOption.id) {
    case 1: // View Profile
      console.log('\n=== YOUR PROFILE ===');
      console.log(`Username: ${userData.username}`);
      console.log(`Email: ${userData.email}`);
      console.log(`Member since: January 2023`);
      break;
      
    case 2: // Edit Settings
      console.log('\n=== EDIT SETTINGS ===');
      console.log('1. Change Theme');
      console.log('2. Toggle Notifications');
      console.log('3. Change Language');
      console.log('4. Back to Main Menu');
      
      rl.question('\nSelect an option (1-4): ', (settingOption) => {
        switch(settingOption) {
          case '1':
            const theme = userData.settings.theme === 'light' ? 'dark' : 'light';
            userData.settings.theme = theme;
            console.log(`Theme changed to ${theme} mode.`);
            break;
            
          case '2':
            userData.settings.notifications = !userData.settings.notifications;
            console.log(`Notifications ${userData.settings.notifications ? 'enabled' : 'disabled'}.`);
            break;
            
          case '3':
            console.log('\nAvailable languages:');
            console.log('1. English (en)');
            console.log('2. Spanish (es)');
            console.log('3. French (fr)');
            
            rl.question('Select language (1-3): ', (langOption) => {
              const languages = { '1': 'en', '2': 'es', '3': 'fr' };
              if (languages[langOption]) {
                userData.settings.language = languages[langOption];
                console.log(`Language changed to ${languages[langOption]}.`);
              } else {
                console.log('Invalid language option.');
              }
              promptUser();
            });
            return; // Don't call promptUser() here as we're handling it in the callback
            
          case '4':
            // Just continue to promptUser() below
            break;
            
          default:
            console.log('Invalid option.');
        }
        promptUser();
      });
      return; // Return early to prevent the default promptUser() call
      
    case 3: // Check Messages
      console.log('\n=== YOUR MESSAGES ===');
      if (userData.messages.length === 0) {
        console.log('No new messages.');
      } else {
        userData.messages.forEach(msg => {
          console.log(`[${msg.read ? ' ' : '!'}] ${msg.id}. From: ${msg.from} - ${msg.subject}`);
        });
      }
      break;
      
    case 4: // Log Out
      console.log('\nLogging out...');
      console.log('Goodbye!');
      rl.close();
      return; // Exit early
      
    case 5: // Exit
      console.log('\nExiting application...');
      rl.close();
      return; // Exit early
  }
  
  // Return to the menu after a short delay
  setTimeout(() => {
    promptUser();
  }, 1000);
}

// Prompt the user for input
function promptUser() {
  displayMenu();
  rl.question('\nSelect an option (1-5): ', (answer) => {
    processOption(answer);
  });
}

// Handle application exit
rl.on('close', () => {
  console.log('\nThank you for using our application!');
  process.exit(0);
});

// Start the application
console.log('Welcome to the Interactive Menu Demo!');
console.log('Use the menu below to navigate:');
promptUser();