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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>SMS Messenger | Secure Numbers</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        .message-item:hover {
            transform: translateY(-2px);
            transition: transform 0.2s ease;
        }
        
        .fade-in {
            animation: fadeIn 0.3s ease-in;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .custom-scrollbar::-webkit-scrollbar {
            width: 6px;
        }
        
        .custom-scrollbar::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }
        
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: #888;
            border-radius: 10px;
        }
        
        .custom-scrollbar::-webkit-scrollbar-thumb:hover {
            background: #555;
        }
        
        .outgoing-bubble {
            background-color: #3b82f6;
            color: white;
            border-radius: 18px 18px 0 18px;
        }
        
        .incoming-bubble {
            background-color: #e2e8f0;
            color: #1e293b;
            border-radius: 18px 18px 18px 0;
        }
        
        .contact-code {
            background-color: #e2e8f0;
            color: #3b82f6;
            padding: 0.25rem 0.5rem;
            border-radius: 0.375rem;
            font-size: 0.75rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
    </style>
</head>
<body class="bg-gray-100">
    <div class="max-w-md mx-auto min-h-screen flex flex-col">
        <!-- Header -->
        <header class="bg-blue-600 text-white p-4 shadow-md">
            <div class="flex items-center justify-between">
                <button id="backBtn" class="text-white hover:text-blue-200">
                    <i class="fas fa-arrow-left text-xl"></i>
                </button>
                <h1 class="text-xl font-bold">Secure SMS</h1>
                <button id="newMsgBtn" class="text-white hover:text-blue-200">
                    <i class="fas fa-plus text-xl"></i>
                </button>
            </div>
        </header>

        <!-- Main Content -->
        <main class="flex-1 p-4 flex flex-col" id="contentArea">
            <!-- Contacts List (Default View) -->
            <div id="contactsView" class="flex-1">
                <div class="mb-4 flex items-center">
                    <div class="relative flex-1">
                        <input type="text" placeholder="Search contacts..." class="w-full pl-10 pr-4 py-2 rounded-full border border-gray-300 focus:outline-none focus:ring-2 focus:ring-blue-500">
                        <i class="fas fa-search absolute left-3 top-3 text-gray-400"></i>
                    </div>
                </div>
                
                <div class="bg-white rounded-xl shadow-sm overflow-hidden">
                    <ul id="contactsList" class="divide-y divide-gray-100 custom-scrollbar" style="max-height: 70vh; overflow-y: auto;">
                        <!-- Contacts will be added here dynamically -->
                    </ul>
                </div>
            </div>

            <!-- Conversation View (Hidden by default) -->
            <div id="conversationView" class="hidden flex-1 flex flex-col">
                <div class="bg-white rounded-t-xl p-4 shadow-sm flex items-center">
                    <img id="contactAvatar" src="https://ui-avatars.com/api/?name=J+D&background=3b82f6&color=fff&rounded=true" alt="Contact" class="w-10 h-10 rounded-full mr-3">
                    <div>
                        <h2 id="contactName" class="font-semibold">John Doe</h2>
                        <p id="contactCode" class="text-xs text-gray-500">Code: #123456789</p>
                    </div>
                    <button id="contactOptions" class="ml-auto text-gray-500 hover:text-blue-600">
                        <i class="fas fa-ellipsis-v"></i>
                    </button>
                </div>
                
                <div id="messagesArea" class="flex-1 p-4 bg-gray-50 custom-scrollbar" style="overflow-y: auto;">
                    <div class="flex flex-col space-y-2">
                        <!-- Messages will be added here dynamically -->
                        <div class="text-center text-xs text-gray-400 my-4">
                            Start of conversation
                        </div>
                    </div>
                </div>
                
                <div class="bg-white p-3 border-t border-gray-200 rounded-b-xl shadow-sm">
                    <div class="flex items-center">
                        <button class="text-blue-600 hover:text-blue-800 mr-2">
                            <i class="fas fa-paperclip text-xl"></i>
                        </button>
                        <input type="text" id="messageInput" placeholder="Type a message" class="flex-1 py-2 px-3 rounded-full border border-gray-300 focus:outline-none focus:ring-2 focus:ring-blue-500">
                        <button id="sendBtn" class="ml-2 bg-blue-600 text-white p-2 rounded-full hover:bg-blue-700 transition-colors">
                            <i class="fas fa-paper-plane"></i>
                        </button>
                    </div>
                </div>
            </div>

            <!-- New Message View (Hidden by default) -->
            <div id="newMessageView" class="hidden flex-1">
                <div class="mb-4">
                    <h2 class="text-lg font-bold text-gray-800 mb-2">New Message</h2>
                    <div class="relative">
                        <label for="recipientInput" class="block text-sm font-medium text-gray-700 mb-1">To:</label>
                        <input type="text" id="recipientInput" placeholder="Contact name or code (e.g. #123456789)" class="w-full pl-3 pr-10 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500">
                        <button id="addRecipientBtn" class="absolute right-3 top-8 text-blue-600">
                            <i class="fas fa-plus-circle"></i>
                        </button>
                    </div>
                </div>
                
                <div class="mb-4">
                    <label for="newMessageText" class="block text-sm font-medium text-gray-700 mb-1">Message:</label>
                    <textarea id="newMessageText" rows="5" class="w-full p-3 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500" placeholder="Type your message here..."></textarea>
                </div>
                
                <div class="flex justify-between">
                    <span id="charCount" class="text-sm text-gray-500">160 characters left</span>
                    <button id="sendNewMessageBtn" class="bg-blue-600 text-white px-4 py-2 rounded-lg hover:bg-blue-700 transition-colors">
                        Send Message
                    </button>
                </div>
            </div>
        </main>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            // UI Elements
            const contactsView = document.getElementById('contactsView');
            const conversationView = document.getElementById('conversationView');
            const newMessageView = document.getElementById('newMessageView');
            const backBtn = document.getElementById('backBtn');
            const newMsgBtn = document.getElementById('newMsgBtn');
            const sendBtn = document.getElementById('sendBtn');
            const sendNewMessageBtn = document.getElementById('sendNewMessageBtn');
            const messageInput = document.getElementById('messageInput');
            const recipientInput = document.getElementById('recipientInput');
            const newMessageText = document.getElementById('newMessageText');
            const charCount = document.getElementById('charCount');
            const messagesArea = document.getElementById('messagesArea');
            const contactsList = document.getElementById('contactsList');
            
            // Number coding system
            const numberToCodeMap = new Map();
            const codeToNumberMap = new Map();
            
            // Generate a 9-digit code from a phone number
            function generateContactCode(phoneNumber) {
                // Simple hash function to generate consistent codes for demo
                let hash = 0;
                for (let i = 0; i < phoneNumber.length; i++) {
                    hash = ((hash << 5) - hash) + phoneNumber.charCodeAt(i);
                    hash = hash & hash; // Convert to 32bit integer
                }
                const code = String(Math.abs(hash)).padStart(9, '0').substring(0, 9);
                
                // Store the mappings
                numberToCodeMap.set(phoneNumber, code);
                codeToNumberMap.set(code, phoneNumber);
                
                return code;
            }
            
            // Get a contact's code (generates if doesn't exist)
            function getContactCode(phoneNumber) {
                if (numberToCodeMap.has(phoneNumber)) {
                    return numberToCodeMap.get(phoneNumber);
                }
                return generateContactCode(phoneNumber);
            }
            
            // Find a contact by name or code
            function findContact(identifier) {
                // Check if it's a code (starts with # and 9 digits)
                if (identifier.startsWith('#') && identifier.length === 10) {
                    const code = identifier.substring(1);
                    if (codeToNumberMap.has(code)) {
                        const phoneNumber = codeToNumberMap.get(code);
                        return contacts.find(c => c.number === phoneNumber);
                    }
                    return null;
                }
                
                // Search by name
                const lowerIdentifier = identifier.toLowerCase();
                return contacts.find(c => 
                    c.name.toLowerCase().includes(lowerIdentifier) || 
                    c.number.includes(identifier)
                );
            }
            
            // Sample contacts data
            const contacts = [
                { id: 1, name: "John Doe", number: "+15551234567", lastMessage: "See you tomorrow!", time: "10:30 AM" },
                { id: 2, name: "Jane Smith", number: "+15559876543", lastMessage: "Thanks for the info", time: "Yesterday" },
                { id: 3, name: "Mike Johnson", number: "+15554567890", lastMessage: "Call me when you can", time: "Monday" },
                { id: 4, name: "Sarah Williams", number: "+15553334444", lastMessage: "Let's meet at 5pm", time: "Last week" },
                { id: 5, name: "David Brown", number: "+15557778888", lastMessage: "Did you see the news?", time: "5/20/23" }
            ];
            
            // Pre-generate codes for all contacts
            contacts.forEach(contact => {
                getContactCode(contact.number);
            });

            // Sample messages data with timestamps
            const sampleMessages = {
                "John Doe": [
                    { text: "Hey, how are you doing?", sent: false, time: "10:25 AM" },
                    { text: "I'm good, thanks! How about you?", sent: true, time: "10:27 AM" },
                    { text: "Pretty good. Want to grab lunch tomorrow?", sent: false, time: "10:29 AM" },
                    { text: "Sure, sounds great! See you tomorrow.", sent: true, time: "10:30 AM" }
                ],
                "Jane Smith": [
                    { text: "Did you get the report I sent?", sent: false, time: "Yesterday 2:45 PM" },
                    { text: "Yes, I received it. Thanks for sending it over.", sent: true, time: "Yesterday 2:50 PM" },
                    { text: "Great! Let me know if you need anything else.", sent: false, time: "Yesterday 2:51 PM" },
                    { text: "Will do. The info was very helpful.", sent: true, time: "Yesterday 3:00 PM" }
                ]
            };

            // Current conversation
            let currentConversation = null;

            // Initialize the app
            function init() {
                renderContacts();
                setupEventListeners();
                updateCharCount();
            }

            // Render contacts list
            function renderContacts() {
                contactsList.innerHTML = '';
                
                contacts.forEach(contact => {
                    const code = getContactCode(contact.number);
                    const li = document.createElement('li');
                    li.className = 'message-item p-3 hover:bg-gray-50 cursor-pointer transition-colors';
                    li.innerHTML = `
                        <div class="flex items-center">
                            <img src="https://ui-avatars.com/api/?name=${contact.name.split(' ').join('+')}&background=3b82f6&color=fff&rounded=true" alt="${contact.name}" class="w-12 h-12 rounded-full mr-3">
                            <div class="flex-1">
                                <div class="flex justify-between items-start">
                                    <h3 class="font-medium text-gray-800">${contact.name}</h3>
                                    <span class="text-xs text-gray-500">${contact.time}</span>
                                </div>
                                <div class="flex items-center justify-between">
                                    <p class="text-sm text-gray-500 truncate">${contact.lastMessage}</p>
                                    <span class="contact-code">#${code}</span>
                                </div>
                            </div>
                        </div>
                    `;
                    li.addEventListener('click', () => openConversation(contact));
                    contactsList.appendChild(li);
                });
            }

            // Open conversation with a contact
            function openConversation(contact) {
                currentConversation = contact;
                
                // Update contact info in conversation view
                document.getElementById('contactName').textContent = contact.name;
                const code = numberToCodeMap.get(contact.number);
                document.getElementById('contactCode').textContent = `Code: #${code}`;
                document.getElementById('contactAvatar').src = `https://ui-avatars.com/api/?name=${contact.name.split(' ').join('+')}&background=3b82f6&color=fff&rounded=true`;
                
                // Switch views
                contactsView.classList.add('hidden');
                newMessageView.classList.add('hidden');
                conversationView.classList.remove('hidden');
                
                // Load messages
                loadMessages(contact.name);
                
                // Scroll to bottom of messages
                setTimeout(() => {
                    messagesArea.scrollTop = messagesArea.scrollHeight;
                }, 100);
            }

            // Load messages for a contact
            function loadMessages(contactName) {
                messagesArea.querySelector('div').innerHTML = '<div class="text-center text-xs text-gray-400 my-4">Start of conversation</div>';
                
                const messages = sampleMessages[contactName] || [];
                
                messages.forEach(msg => {
                    addMessageToView(msg.text, msg.sent, msg.time);
                });
            }

            // Add message to the conversation view
            function addMessageToView(text, isOutgoing, timestamp) {
                const messageDiv = document.createElement('div');
                messageDiv.className = `flex ${isOutgoing ? 'justify-end' : 'justify-start'} fade-in`;
                
                const bubbleClass = isOutgoing ? 'outgoing-bubble' : 'incoming-bubble';
                
                messageDiv.innerHTML = `
                    <div class="max-w-xs md:max-w-md">
                        <div class="${bubbleClass} px-4 py-2 shadow-sm">
                            <p class="text-sm">${text}</p>
                        </div>
                        <div class="text-xs text-gray-500 mt-1 ${isOutgoing ? 'text-right' : 'text-left'}">${timestamp || getCurrentTime()}</div>
                    </div>
                `;
                
                messagesArea.querySelector('div').appendChild(messageDiv);
                messagesArea.scrollTop = messagesArea.scrollHeight;
            }

            // Open new message view
            function openNewMessageView() {
                contactsView.classList.add('hidden');
                conversationView.classList.add('hidden');
                newMessageView.classList.remove('hidden');
                recipientInput.focus();
            }

            // Go back to previous view
            function goBack() {
                if (!contactsView.classList.contains('hidden')) {
                    // Already in contacts view, maybe minimize app in a real scenario
                    return;
                }
                
                if (!conversationView.classList.contains('hidden')) {
                    // Returning from conversation to contacts
                    conversationView.classList.add('hidden');
                    contactsView.classList.remove('hidden');
                } else if (!newMessageView.classList.contains('hidden')) {
                    // Returning from new message view
                    newMessageView.classList.add('hidden');
                    contactsView.classList.remove('hidden');
                }
            }

            // Send a new message
            function sendMessage() {
                const messageText = messageInput.value.trim();
                if (messageText === '') return;
                
                // In a real app, this would send via SMS API (using actual number)
                console.log(`Sending message to ${currentConversation.number}: ${messageText}`);
                
                // Add to conversation view
                addMessageToView(messageText, true);
                
                // Add auto-reply for demo purposes
                setTimeout(() => {
                    const replies = [
                        "Got it, thanks!",
                        "Sure, I'll be there!",
                        "Can we talk later?",
                        "I'll get back to you soon.",
                        "Thanks for letting me know."
                    ];
                    const randomReply = replies[Math.floor(Math.random() * replies.length)];
                    addMessageToView(randomReply, false);
                }, 1000 + Math.random() * 2000);
                
                // Clear input
                messageInput.value = '';
            }

            // Send a new message from new message view
            function sendNewMessage() {
                const recipientIdentifier = recipientInput.value.trim();
                const message = newMessageText.value.trim();
                
                if (recipientIdentifier === '' || message === '') {
                    alert('Please enter a recipient and message');
                    return;
                }
                
                // Find contact by name or code
                const contact = findContact(recipientIdentifier);
                
                if (!contact) {
                    alert('Contact not found. Please enter a valid name or code (e.g. #123456789)');
                    return;
                }
                
                // In a real app, this would send via SMS API (using contact.number)
                console.log(`Sending message to ${contact.number}: ${message}`);
                
                // Show success message
                alert(`Message sent to ${contact.name} (Code: #${numberToCodeMap.get(contact.number)})`);
                
                // Clear form
                recipientInput.value = '';
                newMessageText.value = '';
                
                // Go back to contacts view
                goBack();
            }

            // Update character count
            function updateCharCount() {
                const maxLength = 160;
                const currentLength = newMessageText.value.length;
                const remaining = maxLength - currentLength;
                
                charCount.textContent = `${remaining} characters left`;
                
                if (remaining < 0) {
                    charCount.classList.add('text-red-500');
                    charCount.classList.remove('text-gray-500');
                } else {
                    charCount.classList.add('text-gray-500');
                    charCount.classList.remove('text-red-500');
                }
            }

            // Get current time in HH:MM AM/PM format
            function getCurrentTime() {
                const now = new Date();
                let hours = now.getHours();
                const ampm = hours >= 12 ? 'PM' : 'AM';
                hours = hours % 12;
                hours = hours ? hours : 12; // the hour '0' should be '12'
                const minutes = now.getMinutes().toString().padStart(2, '0');
                return `${hours}:${minutes} ${ampm}`;
            }

            // Set up event listeners
            function setupEventListeners() {
                backBtn.addEventListener('click', goBack);
                newMsgBtn.addEventListener('click', openNewMessageView);
                sendBtn.addEventListener('click', sendMessage);
                sendNewMessageBtn.addEventListener('click', sendNewMessage);
                
                // Send message on Enter key
                messageInput.addEventListener('keypress', (e) => {
                    if (e.key === 'Enter') {
                        sendMessage();
                    }
                });
                
                // Update character count as user types
                newMessageText.addEventListener('input', updateCharCount);
                
                // Prevent Enter key from creating new line when Shift is not pressed
                newMessageText.addEventListener('keydown', (e) => {
                    if (e.key === 'Enter' && !e.shiftKey) {
                        e.preventDefault();
                        sendNewMessage();
                    }
                });
                
                // Tab completion for contact codes
                recipientInput.addEventListener('input', function(e) {
                    if (e.target.value.startsWith('#') && e.target.value.length > 1) {
                        const codeInput = e.target.value.substring(1);
                        const matchingCode = Array.from(codeToNumberMap.keys()).find(k => k.startsWith(codeInput));
                        
                        if (matchingCode && matchingCode !== codeInput && document.activeElement === recipientInput) {
                            const currentPos = e.target.selectionStart;
                            
                            // Set timeout to allow the current input to be processed
                            setTimeout(() => {
                                e.target.value = `#${matchingCode}`;
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            // Initialize the app
            init();
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