// Global variables
let isDarkMode = true;
let currentChat = [];
let isTyping = false;

// DOM elements
const messageInput = document.getElementById('messageInput');
const sendBtn = document.getElementById('sendBtn');
const chatContainer = document.getElementById('chatContainer');
const welcomeScreen = document.getElementById('welcomeScreen');
const themeToggle = document.getElementById('themeToggle');
const settingsBtn = document.getElementById('settingsBtn');
const settingsModal = document.getElementById('settingsModal');
const closeSettings = document.getElementById('closeSettings');
const loadingOverlay = document.getElementById('loadingOverlay');
const suggestions = document.getElementById('suggestions');

// Initialize
document.addEventListener('DOMContentLoaded', () => {
    initializeApp();
});

function initializeApp() {
    setupEventListeners();
    setupAutoResize();
    setupQuickActions();
    setupSuggestionChips();
    
    // Auto-focus input
    messageInput.focus();
}

// Event listeners
function setupEventListeners() {
    sendBtn.addEventListener('click', sendMessage);
    messageInput.addEventListener('keypress', (e) => {
        if (e.key === 'Enter' && !e.shiftKey) {
            e.preventDefault();
            sendMessage();
        }
    });
    
    themeToggle.addEventListener('click', toggleTheme);
    settingsBtn.addEventListener('click', () => settingsModal.classList.remove('hidden'));
    closeSettings.addEventListener('click', () => settingsModal.classList.add('hidden'));
    
    // Handle suggestion clicks
    document.querySelectorAll('.suggestion-chip').forEach(chip => {
        chip.addEventListener('click', () => {
            messageInput.value = chip.dataset.suggestion;
            messageInput.focus();
        });
    });
}

// Auto-resize textarea
function setupAutoResize() {
    messageInput.addEventListener('input', () => {
        messageInput.style.height = 'auto';
        messageInput.style.height = Math.min(messageInput.scrollHeight, 120) + 'px';
    });
}

// Quick actions
function setupQuickActions() {
    document.querySelectorAll('.quick-action-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            const prompt = btn.dataset.prompt;
            messageInput.value = prompt;
            sendMessage();
        });
    });
}
// Suggestion chips with better suggestions
function setupSuggestionChips() {
    const hindiSuggestions = [
        "क्या हाल है?",
        "मजाक सुनाओ",
        "मौसम कैसा है?",
        "कहानी सुनाओ",
        "समय क्या हुआ?",
        "कविता सुनाओ",
        "कोड लिखो",
        "तुम कैसे हो?",
        "मदद चाहिए",
        "नमस्ते"
    ];
    
    const englishSuggestions = [
        "How are you?",
        "Tell me a joke",
        "What's the weather?",
        "Tell a story",
        "What time is it?",
        "Write a poem",
        "Write some code",
        "How are you doing?",
        "I need help",
        "Hello there"
    ];

    // Update suggestions periodically with mix of languages
    setInterval(() => {
        const chips = suggestions.querySelectorAll('.suggestion-chip');
        chips.forEach((chip, index) => {
            const useHindi = Math.random() > 0.5;
            const suggestionsArray = useHindi ? hindiSuggestions : englishSuggestions;
            const randomIndex = Math.floor(Math.random() * suggestionsArray.length);
            chip.textContent = suggestionsArray[randomIndex];
            chip.dataset.suggestion = suggestionsArray[randomIndex];
        });
    }, 8000); // Slightly faster update
}
// Send message with smoother experience
async function sendMessage() {
    const message = messageInput.value.trim();
    if (!message || isTyping) return;
    
    // Hide welcome screen with smooth transition
    if (!welcomeScreen.classList.contains('hidden')) {
        welcomeScreen.style.opacity = '0';
        welcomeScreen.style.transition = 'opacity 0.3s ease';
        setTimeout(() => {
            welcomeScreen.classList.add('hidden');
            chatContainer.classList.remove('hidden');
            chatContainer.style.opacity = '0';
            setTimeout(() => {
                chatContainer.style.opacity = '1';
                chatContainer.style.transition = 'opacity 0.3s ease';
            }, 10);
        }, 300);
    } else {
        chatContainer.classList.remove('hidden');
    }
    
    // Add user message
    addMessage(message, 'user');
    messageInput.value = '';
    messageInput.style.height = 'auto';
    
    // Show typing indicator
    showTypingIndicator();
    // Generate AI response with improved system
    await generateAIResponse(message);
}
// Add message to chat with improved code handling
function addMessage(content, sender) {
    const messageDiv = document.createElement('div');
    messageDiv.className = `flex ${sender === 'user' ? 'justify-end' : 'justify-start'} message-enter`;
    
    const messageContent = document.createElement('div');
    messageContent.className = sender === 'user' ? 'user-message' : 'ai-message';
    
    // Improved code detection with multiple languages
    if (content.includes('```')) {
        const parts = content.split('```');
        parts.forEach((part, index) => {
            if (index % 2 === 1) {
                // Code block with syntax highlighting
                const pre = document.createElement('pre');
                pre.className = 'code-block';
                const code = document.createElement('code');
                
                // Detect language for better formatting
                const firstLine = part.trim().split('\n')[0];
                let language = 'javascript';
                if (firstLine.includes('python') || firstLine.includes('py')) language = 'python';
                if (firstLine.includes('html')) language = 'html';
                if (firstLine.includes('css')) language = 'css';
                if (firstLine.includes('java')) language = 'java';
                
                code.className = `language-${language}`;
                code.textContent = part.replace(firstLine, '').trim();
                pre.appendChild(code);
                messageContent.appendChild(pre);
            } else if (part.trim()) {
                // Regular text with proper line breaks
                part.split('\n').forEach(textLine => {
                    if (textLine.trim()) {
                        const p = document.createElement('p');
                        p.textContent = textLine;
                        p.style.marginBottom = '0.5rem';
                        messageContent.appendChild(p);
                    }
                });
            }
        });
    } else {
        // Handle regular text with line breaks
        content.split('\n').forEach(textLine => {
            if (textLine.trim()) {
                const p = document.createElement('p');
                p.textContent = textLine;
                p.style.marginBottom = '0.5rem';
                messageContent.appendChild(p);
            }
        });
    }
    
    messageDiv.appendChild(messageContent);
    chatContainer.appendChild(messageDiv);
    
    // Smooth scroll to bottom
    setTimeout(() => {
        chatContainer.scrollTo({
            top: chatContainer.scrollHeight,
            behavior: 'smooth'
        });
    }, 50);
    
    // Store in current chat
    currentChat.push({ content, sender, timestamp: new Date() });
}
// Show typing indicator
function showTypingIndicator() {
    isTyping = true;
    const typingDiv = document.createElement('div');
    typingDiv.className = 'flex justify-start message-enter';
    typingDiv.id = 'typingIndicator';
    
    const typingContent = document.createElement('div');
    typingContent.className = 'typing-indicator';
    typingContent.innerHTML = '<span></span><span></span><span></span>';
    
    typingDiv.appendChild(typingContent);
    chatContainer.appendChild(typingDiv);
    chatContainer.scrollTop = chatContainer.scrollHeight;
}
// Generate AI response with strict Hindi-first behavior
async function generateAIResponse(userMessage) {
    // Faster response time
    await new Promise(resolve => setTimeout(resolve, 200 + Math.random() * 100));
    
    const typingIndicator = document.getElementById('typingIndicator');
    if (typingIndicator) typingIndicator.remove();
    
    let response = "";
    
    const hasHindi = /[\u0900-\u097F]/.test(userMessage);
    const hasEnglish = /[a-zA-Z]/.test(userMessage);
    const useHindi = hasHindi || !hasEnglish;
    
    const lowerMessage = userMessage.toLowerCase();
    
    // Greetings - Normal human-like
    if (lowerMessage.includes('नमस्ते') || lowerMessage.includes('हैलो') || lowerMessage === 'hi' || lowerMessage === 'hello') {
        response = "नमस्ते!";
    }
    else if (lowerMessage.includes('हाल') || lowerMessage.includes('कैसे') || lowerMessage.includes('how are')) {
        response = useHindi ? "ठीक हूँ। आप?" : "I'm good. You?";
    }
    
    // Joke - Direct joke, no intro
    else if (lowerMessage.includes('joke') || lowerMessage.includes('मजाक') || lowerMessage.includes('मजा')) {
        response = useHindi ? 
            "डॉक्टर: आपको 1 दिन की दवा लेनी है।\nमरीज़: कब से?\nडॉक्टर: कब से क्या?" : 
            "Doctor: Take 1 day of medicine.\nPatient: Since when?\nDoctor: Since when what?";
    }
    
    // Story - Immediate full story
    else if (lowerMessage.includes('कहानी') || lowerMessage.includes('story') || lowerMessage.includes('कहो')) {
        response = useHindi ? 
            "एक चूहा था जो रोज़ दाना बीनता। एक दिन उसे सोने का सिक्का मिला। खुश होकर उसने उसे छिपाया। दूसरे दिन चोर आया, सब ले गया। चूहे ने सीखा: अति का भला न बोले रे कोई।" : 
            "A mouse collected grain daily. One day he found a gold coin. He hid it happily. Next day a thief came, took everything. Mouse learned: Greed brings loss.";
    }
    
    // Poetry - Direct poem
    else if (lowerMessage.includes('कविता') || lowerMessage.includes('poem') || lowerMessage.includes('कविता सुनाओ')) {
        response = useHindi ? 
            "चाँद सितारे आसमान में,\nचिड़ियाँ चहचहाती हैं,\nमन करता है उड़ जाऊँ मैं,\nइस अनंत नभ में।" : 
            "Moon and stars in the sky,\nBirds are chirping,\nI wish to fly,\nIn this endless sky.";
    }
    
    // Code - ONLY if explicitly asked "code likho" or "कोड लिखो"
    else if (lowerMessage.includes('code likho') || lowerMessage.includes('कोड लिखो') || lowerMessage.includes('code बनाओ')) {
        response = useHindi ? "हाँ, कौन सा code चाहिए? Python, JavaScript, HTML?" : "Yes, what code do you need?";
    }
    
    // Weather - Direct answer
    else if (lowerMessage.includes('मौसम') || lowerMessage.includes('weather')) {
        response = useHindi ? "माफ़ी, मौसम check नहीं कर पा रहा अभी।" : "Sorry, can't check weather right now.";
    }
    
    // Time - Direct answer
    else if (lowerMessage.includes('time') || lowerMessage.includes('समय') || lowerMessage.includes('टाइम') || lowerMessage.includes('कितना बजा')) {
        const now = new Date();
        const timeStr = `${now.getHours()}:${now.getMinutes().toString().padStart(2, '0')}`;
        response = timeStr;
    }
    
    // Help - Direct answer
    else if (lowerMessage.includes('help') || lowerMessage.includes('मदद') || lowerMessage.includes('help करो')) {
        response = useHindi ? "बोलिए, क्या चाहिए?" : "Tell me, what do you need?";
    }
    
    // Math - Direct calculation
    else if (/[\d+\-*/]/.test(userMessage)) {
        try {
            const result = eval(userMessage.replace(/[^0-9+\-*/().\s]/g, ''));
            response = String(result);
        } catch {
            response = useHindi ? "गलत calculation" : "Invalid calculation";
        }
    }
    
    // Name - Direct answer
    else if (lowerMessage.includes('नाम') || lowerMessage.includes('kaun') || lowerMessage.includes('who are')) {
        response = useHindi ? "मैं Desi AI Assistant हूँ। आपका AI दोस्त।" : "I'm Desi AI Assistant, your AI friend.";
    }
    
    // Age - Direct answer
    else if (lowerMessage.includes('उम्र') || lowerMessage.includes('age') || lowerMessage.includes('बहुत पुराना')) {
        response = useHindi ? "बस बनकर हुआ हूँ, उम्र मत पूछो।" : "Just created, don't ask age!";
    }
    
    // Where - Direct answer
    else if (lowerMessage.includes('कहाँ') || lowerMessage.includes('where') || lowerMessage.includes('रहता') || lowerMessage.includes('rehta')) {
        response = useHindi ? "यहीं हूँ, आपके फोन में।" : "Right here, in your phone.";
    }
    
    // Failsafe for unclear inputs
    else {
        response = "थोड़ा साफ बताओ";
    }
    
    addMessage(response, 'ai');
    isTyping = false;
}
// Toggle theme
function toggleTheme() {
    isDarkMode = !isDarkMode;
    document.body.classList.toggle('bg-gray-900');
    document.body.classList.toggle('text-white');
    document.body.classList.toggle('bg-white');
    document.body.classList.toggle('text-gray-900');
    
    const icon = themeToggle.querySelector('i');
    icon.setAttribute('data-feather', isDarkMode ? 'sun' : 'moon');
    feather.replace();
}