// Theme toggle functionality
const toggleTheme = () => {
    document.documentElement.classList.toggle('dark');
    localStorage.setItem('theme', document.documentElement.classList.contains('dark') ? 'dark' : 'light');
};

// Initialize theme
if (localStorage.getItem('theme') === 'dark' || 
    (window.matchMedia('(prefers-color-scheme: dark)').matches && !localStorage.getItem('theme'))) {
    document.documentElement.classList.add('dark');
}

// Auto-resize textarea
const textarea = document.querySelector('textarea');
const resizeTextarea = () => {
    textarea.style.height = 'auto';
    textarea.style.height = `${textarea.scrollHeight}px`;
};

textarea.addEventListener('input', resizeTextarea);

// Send message functionality
const sendMessage = () => {
    const message = textarea.value.trim();
    if (!message) return;
    
    // Add user message
    addMessage(message, 'user');
    textarea.value = '';
    resizeTextarea();
    
    // Simulate AI response
    setTimeout(() => {
        addMessage("I'm Gemini, your AI assistant. I'll respond shortly...", 'ai');
    }, 1000);
};

const addMessage = (content, sender) => {
    const messagesContainer = document.querySelector('.chat-messages');
    const messageElement = document.createElement('div');
    messageElement.className = `message ${sender}-message`;
    
    messageElement.innerHTML = `
        <div class="message-content">
            <p>${content}</p>
        </div>
    `;
    
    messagesContainer.appendChild(messageElement);
    messagesContainer.scrollTop = messagesContainer.scrollHeight;
};

// Event listeners
document.querySelector('.send-btn').addEventListener('click', sendMessage);
textarea.addEventListener('keydown', (e) => {
    if (e.key === 'Enter' && !e.shiftKey) {
        e.preventDefault();
        sendMessage();
    }
});

// Mobile menu toggle
const toggleMobileMenu = () => {
    document.querySelector('.sidebar').classList.toggle('active');
};

// Initialize feather icons
feather.replace();

// Chat item selection
document.querySelectorAll('.chat-item').forEach(item => {
    item.addEventListener('click', () => {
        document.querySelectorAll('.chat-item').forEach(i => i.classList.remove('active'));
        item.classList.add('active');
    });
});