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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, maximum-scale=1.0, user-scalable=no">
    <title>Arjun Compound | Advanced AI</title>
    
    <!-- Fonts & Icons -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link href="https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    
    <!-- Markdown & Syntax Highlighting -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/12.0.1/marked.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>

    <style>
        /* --- CORE VARIABLES --- */
        :root {
            --bg-main: #F5F5F7; --bg-panel: #FFFFFF;
            --text-dark: #1D1D1F; --text-muted: #86868B;
            --accent-blue: #007AFF; --accent-hover: #0056b3;
            --danger: #FF3B30; --success: #34C759;
            --border-light: rgba(0,0,0,0.08); --border-focus: rgba(0, 122, 255, 0.3);
            --shadow-sm: 0 4px 12px rgba(0,0,0,0.05); --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
            --font-sans: 'Plus Jakarta Sans', sans-serif; --font-mono: 'Fira Code', monospace;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; -webkit-font-smoothing: antialiased; }
        body { font-family: var(--font-sans); background: var(--bg-main); color: var(--text-dark); height: 100dvh; width: 100vw; overflow: hidden; display: flex; }

        /* --- TOAST NOTIFICATIONS --- */
        #toast-container { position: absolute; top: 20px; left: 50%; transform: translateX(-50%); z-index: 10000; display: flex; flex-direction: column; gap: 10px; }
        .toast { background: var(--text-dark); color: #fff; padding: 12px 24px; border-radius: 50px; font-size: 14px; font-weight: 600; box-shadow: var(--shadow-md); animation: slideDown 0.4s ease; display: flex; align-items: center; gap: 10px; }
        @keyframes slideDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }

        /* --- LAYOUT SHELL --- */
        .app-shell { display: flex; width: 100%; height: 100%; position: relative; }

        /* --- SIDEBAR --- */
        .sidebar { width: 300px; background: var(--bg-panel); border-right: 1px solid var(--border-light); display: flex; flex-direction: column; flex-shrink: 0; transition: transform 0.3s ease; z-index: 100; }
        .brand-header { padding: 24px; border-bottom: 1px solid var(--border-light); display: flex; justify-content: space-between; align-items: center; }
        .brand-info h1 { font-size: 20px; font-weight: 800; letter-spacing: -0.5px; }
        .brand-info p { font-size: 11px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; margin-top: 2px; }
        .close-sidebar-btn { display: none; background: none; border: none; font-size: 20px; color: var(--text-dark); cursor: pointer; }

        .auth-section { padding: 20px; border-bottom: 1px solid var(--border-light); }
        .btn-primary { width: 100%; padding: 14px; background: var(--text-dark); color: #fff; border: none; border-radius: 14px; font-size: 14px; font-weight: 700; cursor: pointer; transition: 0.2s; display: flex; align-items: center; justify-content: center; gap: 8px; }
        .btn-primary:hover { background: #333; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
        
        /* Logged In User Profile */
        .user-profile { display: none; align-items: center; justify-content: space-between; background: var(--bg-main); padding: 12px 16px; border-radius: 14px; border: 1px solid var(--border-light); }
        .user-details { display: flex; align-items: center; gap: 12px; overflow: hidden; }
        .user-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--accent-blue); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
        .user-email { font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 140px;}
        .btn-logout { background: none; border: none; color: var(--danger); cursor: pointer; font-size: 16px; padding: 8px; border-radius: 8px; transition: 0.2s; }
        .btn-logout:hover { background: #FFEBEE; }

        .sidebar-menu { padding: 20px; flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
        .menu-btn { width: 100%; padding: 14px; text-align: left; background: transparent; border: 1px solid transparent; border-radius: 12px; font-size: 14px; font-weight: 600; color: var(--text-dark); cursor: pointer; transition: 0.2s; display: flex; align-items: center; gap: 12px; }
        .menu-btn:hover { background: var(--bg-main); border-color: var(--border-light); }
        .menu-btn.danger { color: var(--danger); margin-top: auto; border: 1px solid var(--border-light); }
        .menu-btn.danger:hover { background: #FFEBEE; border-color: var(--danger); }

        /* --- MAIN WORKSPACE --- */
        .main-area { flex: 1; display: flex; flex-direction: column; position: relative; min-width: 0; background: var(--bg-main); }
        
        .top-nav { height: 60px; padding: 0 24px; display: flex; align-items: center; gap: 16px; background: rgba(245,245,247,0.8); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-light); z-index: 10; }
        .hamburger { background: none; border: none; font-size: 20px; color: var(--text-dark); cursor: pointer; display: none; padding: 8px; border-radius: 8px; }
        .nav-title { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
        .nav-status { width: 8px; height: 8px; background: var(--success); border-radius: 50%; box-shadow: 0 0 0 2px rgba(52,199,89,0.2); }

        /* --- CHAT HISTORY --- */
        .chat-container { flex: 1; overflow-y: auto; padding: 30px 40px; display: flex; flex-direction: column; gap: 24px; scroll-behavior: smooth; }
        .chat-container::-webkit-scrollbar { width: 6px; }
        .chat-container::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 10px; }

        .welcome-screen { margin: auto; text-align: center; max-width: 600px; animation: fadeIn 0.5s ease; }
        .welcome-icon { font-size: 48px; margin-bottom: 20px; background: -webkit-linear-gradient(45deg, var(--text-dark), var(--accent-blue)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .welcome-title { font-size: 32px; font-weight: 800; margin-bottom: 10px; letter-spacing: -0.5px; }
        .welcome-desc { color: var(--text-muted); font-size: 15px; line-height: 1.6; margin-bottom: 30px; }
        
        .guest-badge { display: inline-flex; align-items: center; gap: 8px; background: #FFF4E5; color: #FF9500; padding: 8px 16px; border-radius: 20px; font-size: 13px; font-weight: 700; border: 1px solid #FFE0B2; margin-bottom: 20px; }

        .msg-row { display: flex; gap: 16px; max-width: 85%; animation: slideUp 0.3s ease; }
        @keyframes slideUp { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }
        .msg-row.user { align-self: flex-end; flex-direction: row-reverse; }
        .msg-row.bot { align-self: flex-start; }
        
        .avatar { width: 36px; height: 36px; border-radius: 50%; display: flex; justify-content: center; align-items: center; font-size: 14px; font-weight: 700; flex-shrink: 0; box-shadow: var(--shadow-sm); }
        .msg-row.user .avatar { background: var(--text-dark); color: #fff; }
        .msg-row.bot .avatar { background: #fff; color: var(--accent-blue); border: 1px solid var(--border-light); }

        .msg-bubble { padding: 16px 20px; border-radius: 20px; font-size: 15px; line-height: 1.6; word-wrap: break-word; overflow-wrap: anywhere; box-shadow: var(--shadow-sm); }
        .msg-row.user .msg-bubble { background: var(--text-dark); color: #fff; border-top-right-radius: 4px; }
        .msg-row.bot .msg-bubble { background: var(--bg-panel); color: var(--text-dark); border-top-left-radius: 4px; border: 1px solid var(--border-light); width: 100%; }

        /* Markdown Styles */
        .msg-bubble p { margin-bottom: 12px; }
        .msg-bubble p:last-child { margin-bottom: 0; }
        .msg-bubble code { font-family: var(--font-mono); background: rgba(0,0,0,0.05); padding: 3px 6px; border-radius: 6px; font-size: 0.9em; color: #E91E63; }
        .msg-row.user .msg-bubble code { background: rgba(255,255,255,0.2); color: #fff; }
        .msg-bubble pre { background: #1E1E1E; padding: 16px; border-radius: 12px; overflow-x: auto; margin: 12px 0; border: 1px solid #333; }
        .msg-bubble pre code { background: transparent; color: #D4D4D4; padding: 0; }
        .msg-bubble img { max-width: 100%; border-radius: 12px; margin: 10px 0; box-shadow: var(--shadow-sm); }
        .copy-btn { background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); color: #fff; padding: 4px 10px; border-radius: 6px; font-size: 11px; cursor: pointer; float: right; margin-bottom: 8px; }

        /* Attachment Previews in Chat */
        .chat-attachment { display: flex; align-items: center; gap: 10px; background: rgba(255,255,255,0.1); padding: 8px 12px; border-radius: 10px; border: 1px solid rgba(255,255,255,0.2); margin-bottom: 8px; font-size: 12px; }
        .chat-attachment i { font-size: 16px; }
        .msg-row.bot .chat-attachment { background: rgba(0,0,0,0.04); border-color: rgba(0,0,0,0.1); }

        /* --- INPUT AREA --- */
        .input-zone { padding: 0 40px 30px; background: linear-gradient(to top, var(--bg-main) 70%, transparent); position: relative; z-index: 20; }
        .input-wrapper { background: rgba(255,255,255,0.9); backdrop-filter: blur(20px); border: 1px solid var(--border-light); border-radius: 24px; box-shadow: var(--shadow-md); display: flex; flex-direction: column; transition: 0.3s; }
        .input-wrapper:focus-within { border-color: var(--border-focus); box-shadow: 0 12px 40px rgba(0,122,255,0.15); }

        /* File Preview Area */
        .file-preview { display: none; padding: 16px 20px 0; align-items: center; gap: 12px; border-bottom: 1px solid rgba(0,0,0,0.05); padding-bottom: 12px; margin: 12px 20px 0; }
        .file-preview.active { display: flex; }
        .file-thumb { width: 40px; height: 40px; border-radius: 8px; object-fit: cover; background: #f0f0f0; display: flex; justify-content: center; align-items: center; font-size: 20px; color: var(--text-muted); }
        .file-info { flex: 1; overflow: hidden; }
        .file-name { font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .file-meta { font-size: 11px; color: var(--text-muted); }
        .remove-file { background: #FFEBEE; color: var(--danger); border: none; width: 28px; height: 28px; border-radius: 50%; cursor: pointer; display: flex; justify-content: center; align-items: center; transition: 0.2s; }
        .remove-file:hover { background: var(--danger); color: #fff; }

        .input-row { display: flex; align-items: flex-end; gap: 12px; padding: 12px 16px 12px 20px; }
        
        .action-icon-btn { width: 40px; height: 40px; border-radius: 12px; background: transparent; border: none; font-size: 18px; color: var(--text-muted); cursor: pointer; display: flex; justify-content: center; align-items: center; transition: 0.2s; position: relative; overflow: hidden; }
        .action-icon-btn:hover { background: rgba(0,0,0,0.05); color: var(--text-dark); }
        .action-icon-btn input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
        
        /* Voice Active Animation */
        .action-icon-btn.recording { color: var(--danger); animation: pulseRecord 1.5s infinite; }
        @keyframes pulseRecord { 0% { background: rgba(255,59,48,0.1); } 50% { background: rgba(255,59,48,0.3); } 100% { background: rgba(255,59,48,0.1); } }

        .chat-input { flex: 1; border: none; outline: none; background: transparent; font-family: var(--font-sans); font-size: 15px; color: var(--text-dark); resize: none; min-height: 24px; max-height: 200px; padding: 8px 0; line-height: 1.5; }
        
        .send-btn { width: 44px; height: 44px; border-radius: 14px; border: none; background: var(--text-dark); color: #fff; display: flex; justify-content: center; align-items: center; cursor: pointer; transition: 0.2s; box-shadow: 0 4px 12px rgba(0,0,0,0.1); flex-shrink: 0; }
        .send-btn:hover { background: #333; transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0,0,0,0.2); }
        .send-btn:disabled { background: #ccc; cursor: not-allowed; transform: none; box-shadow: none; }

        /* --- AUTH MODAL --- */
        .modal-overlay { position: fixed; inset: 0; background: rgba(245,245,247,0.8); backdrop-filter: blur(20px); z-index: 5000; display: none; justify-content: center; align-items: center; animation: fadeIn 0.3s ease; }
        @keyframes fadeIn { from{opacity:0;} to{opacity:1;} }
        
        .modal-card { background: #fff; padding: 40px; border-radius: 32px; width: 100%; max-width: 440px; border: 1px solid var(--border-light); box-shadow: var(--shadow-md); position: relative; margin: 20px; }
        .close-modal { position: absolute; top: 20px; right: 20px; background: none; border: none; font-size: 20px; color: var(--text-muted); cursor: pointer; transition: 0.2s; }
        .close-modal:hover { color: var(--danger); transform: rotate(90deg); }
        
        .modal-header { text-align: center; margin-bottom: 24px; }
        .modal-header h2 { font-size: 26px; font-weight: 800; color: var(--text-dark); }
        
        .auth-tabs { display: flex; background: var(--bg-main); padding: 4px; border-radius: 12px; margin-bottom: 24px; }
        .auth-tab { flex: 1; padding: 10px; text-align: center; border-radius: 8px; font-size: 14px; font-weight: 700; color: var(--text-muted); cursor: pointer; transition: 0.2s; }
        .auth-tab.active { background: #fff; color: var(--text-dark); box-shadow: var(--shadow-sm); }

        .auth-step { display: none; flex-direction: column; animation: slideIn 0.3s ease; }
        .auth-step.active { display: flex; }
        @keyframes slideIn { from{opacity:0; transform:translateX(20px);} to{opacity:1; transform:translateX(0);} }

        .input-group { position: relative; margin-bottom: 16px; }
        .input-group i { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 16px; }
        .input-group input { width: 100%; padding: 16px 16px 16px 48px; border: 1px solid var(--border-light); border-radius: 14px; font-size: 15px; background: #FAFAFA; outline: none; transition: 0.3s; font-family: var(--font-sans); }
        .input-group input:focus { border-color: var(--accent-blue); background: #fff; box-shadow: 0 4px 12px rgba(0,122,255,0.1); }
        
        .btn-text { background: none; border: none; color: var(--text-muted); font-size: 14px; font-weight: 600; cursor: pointer; margin-top: 10px; padding: 10px; width: 100%; transition: 0.2s; }
        .btn-text:hover { color: var(--text-dark); }

        /* --- RESPONSIVE MOBILE ADAPTIVE --- */
        @media (max-width: 850px) {
            .sidebar { position: absolute; left: -300px; height: 100%; box-shadow: var(--shadow-md); }
            .sidebar.open { left: 0; transform: translateX(0); }
            .hamburger, .close-sidebar-btn { display: block; }
            .chat-container { padding: 20px 20px; }
            .input-zone { padding: 0 15px 20px; }
            .msg-row { max-width: 95%; }
            .modal-card { padding: 30px 24px; }
        }
    </style>
</head>
<body>

<div id="toast-container"></div>

<div class="app-shell">
    <!-- Sidebar -->
    <aside class="sidebar" id="sidebar">
        <div class="brand-header">
            <div class="brand-info">
                <h1>Arjun Compound</h1>
                <p>By Abhay Kumar</p>
            </div>
            <button class="close-sidebar-btn" onclick="toggleSidebar()"><i class="fa-solid fa-xmark"></i></button>
        </div>

        <!-- Auth / Profile Section -->
        <div class="auth-section">
            <button id="loginBtn" class="btn-primary" onclick="openAuthModal()"><i class="fa-solid fa-shield-halved"></i> Secure Login</button>
            <div id="userProfile" class="user-profile">
                <div class="user-details">
                    <div class="user-avatar" id="uAvatar">U</div>
                    <div class="user-email" id="uEmail">user@email.com</div>
                </div>
                <button class="btn-logout" onclick="logout()" title="Logout Account"><i class="fa-solid fa-power-off"></i></button>
            </div>
        </div>

        <div class="sidebar-menu">
            <button class="menu-btn" onclick="sendEx('Write a python script for a simple HTTP server.')"><i class="fa-solid fa-code"></i> Code Assistant</button>
            <button class="menu-btn" onclick="sendEx('Create a cinematic image of a futuristic Indian city.')"><i class="fa-solid fa-image"></i> Generate Image</button>
            <button class="menu-btn danger" onclick="clearMemory()"><i class="fa-solid fa-trash-can"></i> Clear History</button>
        </div>
    </aside>

    <!-- Main Workspace -->
    <main class="main-area">
        <header class="top-nav">
            <button class="hamburger" onclick="toggleSidebar()"><i class="fa-solid fa-bars"></i></button>
            <div class="nav-title"><div class="nav-status"></div> Arjun AI Connected</div>
        </header>

        <div class="chat-container" id="chatArea">
            <div class="welcome-screen" id="welcomeScreen">
                <div class="welcome-icon"><i class="fa-solid fa-microchip"></i></div>
                <h2 class="welcome-title">How can I help you today?</h2>
                <p class="welcome-desc">I am Arjun Compound, an advanced AI developed by Abhay Kumar. I can write code, analyze files, understand voice, and generate images.</p>
                
                <div id="guestBadge" class="guest-badge" style="display: none;">
                    <i class="fa-solid fa-circle-exclamation"></i> Guest Mode: <span id="guestCount">0</span>/3 Queries Used. Login to unlock.
                </div>
            </div>
        </div>

        <div class="input-zone">
            <div class="input-wrapper">
                <!-- File Preview UI -->
                <div class="file-preview" id="filePreview">
                    <div class="file-thumb" id="fileThumb"><i class="fa-solid fa-file-lines"></i></div>
                    <div class="file-info">
                        <div class="file-name" id="fileName">document.pdf</div>
                        <div class="file-meta" id="fileMeta">Processing...</div>
                    </div>
                    <button class="remove-file" onclick="removeFile()"><i class="fa-solid fa-xmark"></i></button>
                </div>

                <div class="input-row">
                    <!-- Universal File Attach -->
                    <button class="action-icon-btn" title="Attach File or Image">
                        <i class="fa-solid fa-paperclip"></i>
                        <input type="file" id="fileInput" accept="*/*" onchange="handleFile(this)">
                    </button>
                    
                    <!-- Voice Input (Google Speech API) -->
                    <button class="action-icon-btn" id="voiceBtn" onclick="toggleVoice()" title="Voice Input">
                        <i class="fa-solid fa-microphone"></i>
                    </button>

                    <textarea class="chat-input" id="chatInput" placeholder="Type a message or use voice..." rows="1" oninput="autoGrow(this)" onkeydown="handleKey(event)"></textarea>
                    
                    <button class="send-btn" id="sendBtn" onclick="sendMsg()">
                        <i class="fa-solid fa-paper-plane"></i>
                    </button>
                </div>
            </div>
        </div>
    </main>
</div>

<!-- Authentication Modal (GAS Powered) -->
<div class="modal-overlay" id="authModal">
    <div class="modal-card">
        <button class="close-modal" onclick="closeAuthModal()"><i class="fa-solid fa-xmark"></i></button>
        <div class="modal-header"><h2>Arjun Network</h2></div>
        
        <div class="auth-tabs">
            <div class="auth-tab active" id="tab-login" onclick="switchAuthTab('login')">Login</div>
            <div class="auth-tab" id="tab-register" onclick="switchAuthTab('register')">Create Account</div>
        </div>

        <!-- Login Flow -->
        <div id="flow-login">
            <div class="auth-step active" id="log-step-1">
                <div class="input-group"><i class="fa-solid fa-envelope"></i><input type="email" id="logEmail" placeholder="Registered Email"></div>
                <button class="btn-primary" id="btn-log-otp" onclick="processAuth('login_send_otp')">Send Secure OTP</button>
            </div>
            <div class="auth-step" id="log-step-2">
                <div class="input-group"><i class="fa-solid fa-key"></i><input type="number" id="logOTP" placeholder="Enter 6-Digit OTP"></div>
                <button class="btn-primary" id="btn-log-verify" onclick="processAuth('login_verify')">Verify & Login</button>
                <button class="btn-text" onclick="switchStep('log-step-2', 'log-step-1')">Back</button>
            </div>
        </div>

        <!-- Register Flow -->
        <div id="flow-register" style="display: none;">
            <div class="auth-step active" id="reg-step-1">
                <div class="input-group"><i class="fa-solid fa-user"></i><input type="text" id="regName" placeholder="Full Name"></div>
                <div class="input-group"><i class="fa-solid fa-envelope"></i><input type="email" id="regEmail" placeholder="Email Address"></div>
                <button class="btn-primary" id="btn-reg-otp" onclick="processAuth('register_send_otp')">Generate OTP</button>
            </div>
            <div class="auth-step" id="reg-step-2">
                <div class="input-group"><i class="fa-solid fa-shield-check"></i><input type="number" id="regOTP" placeholder="Enter Verification OTP"></div>
                <button class="btn-primary" id="btn-reg-verify" onclick="processAuth('register_verify')">Create Account</button>
                <button class="btn-text" onclick="switchStep('reg-step-2', 'reg-step-1')">Back</button>
            </div>
        </div>
    </div>
</div>

<script>
// --- CORE CONFIGURATION & STATE ---
const GAS_URL = "https://script.google.com/macros/s/AKfycbzTsXGoVh97JjtFAAG825GF4WUZqf7FDB3Zbxyf0nrLXt_1HjJSSqA829UcdoamRPvg0A/exec";
const STATE = { history: [], pendingFile: null, isProcessing: false };

// CACHE MEMORY (Persistent Login)
let currentUser = localStorage.getItem('arjun_user');
let guestCount = parseInt(localStorage.getItem('arjun_guest') || '0');

// --- INITIALIZATION ---
window.onload = () => {
    updateUIForAuth();
    if (currentUser) { fetchHistoryFromGAS(); } 
    else { 
        document.getElementById('guestBadge').style.display = 'inline-flex';
        document.getElementById('guestCount').innerText = guestCount;
    }
    setupMarkdown();
};

function showToast(msg) {
    const t = document.createElement('div'); t.className = 'toast';
    t.innerHTML = `<i class="fa-solid fa-circle-info"></i> ${msg}`;
    document.getElementById('toast-container').appendChild(t);
    setTimeout(() => t.remove(), 3000);
}

function toggleSidebar() { document.getElementById('sidebar').classList.toggle('open'); }
function autoGrow(el) { el.style.height = 'auto'; el.style.height = Math.min(el.scrollHeight, 200) + 'px'; }
function handleKey(e) { if(e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); sendMsg(); } }
function scrollChat() { const c = document.getElementById('chatArea'); c.scrollTo({ top: c.scrollHeight, behavior: 'smooth' }); }

// --- AUTHENTICATION (Login / Register / Cache) ---
function updateUIForAuth() {
    if (currentUser) {
        document.getElementById('loginBtn').style.display = 'none';
        document.getElementById('userProfile').style.display = 'flex';
        document.getElementById('uEmail').innerText = currentUser;
        document.getElementById('uAvatar').innerText = currentUser.charAt(0).toUpperCase();
        document.getElementById('guestBadge').style.display = 'none';
    } else {
        document.getElementById('loginBtn').style.display = 'flex';
        document.getElementById('userProfile').style.display = 'none';
    }
}

function openAuthModal() { document.getElementById('authModal').style.display = 'flex'; }
function closeAuthModal() { document.getElementById('authModal').style.display = 'none'; }

function switchAuthTab(tab) {
    document.querySelectorAll('.auth-tab').forEach(e => e.classList.remove('active'));
    document.getElementById(`tab-${tab}`).classList.add('active');
    document.getElementById('flow-login').style.display = tab === 'login' ? 'block' : 'none';
    document.getElementById('flow-register').style.display = tab === 'register' ? 'block' : 'none';
}
function switchStep(curr, next) {
    document.getElementById(curr).classList.remove('active');
    document.getElementById(next).classList.add('active');
}

async function processAuth(action) {
    let payload = { action }; let btnId = '';
    
    if (action === 'register_send_otp') {
        payload.name = document.getElementById('regName').value.trim();
        payload.email = document.getElementById('regEmail').value.trim();
        payload.phone = "0000000000"; payload.organization = "Arjun Compound";
        if(!payload.email || !payload.name) return showToast("Name and Email required."); 
        btnId = 'btn-reg-otp';
    } else if (action === 'login_send_otp') {
        payload.email = document.getElementById('logEmail').value.trim();
        if(!payload.email) return showToast("Enter email first."); 
        btnId = 'btn-log-otp';
    } else if (action === 'register_verify' || action === 'login_verify') {
        payload.email = document.getElementById(action === 'register_verify' ? 'regEmail' : 'logEmail').value.trim();
        payload.otp = document.getElementById(action === 'register_verify' ? 'regOTP' : 'logOTP').value.trim();
        if(!payload.otp) return showToast("Enter OTP!"); 
        btnId = action === 'register_verify' ? 'btn-reg-verify' : 'btn-log-verify';
    }

    const btn = document.getElementById(btnId); const ogText = btn.innerHTML;
    btn.disabled = true; btn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> Processing...';

    try {
        const res = await fetch(GAS_URL, { method: 'POST', body: JSON.stringify(payload) });
        const data = await res.json();
        
        if (data.status === 'success') {
            showToast(data.message);
            if (action === 'register_send_otp') switchStep('reg-step-1', 'reg-step-2');
            else if (action === 'login_send_otp') switchStep('log-step-1', 'log-step-2');
            else if (action === 'register_verify' || action === 'login_verify') {
                currentUser = payload.email; 
                localStorage.setItem('arjun_user', currentUser); // Persistent Cache Update
                closeAuthModal(); updateUIForAuth(); fetchHistoryFromGAS();
            }
        } else showToast(data.message);
    } catch (e) { showToast("Network Error."); }
    btn.disabled = false; btn.innerHTML = ogText;
}

function logout() { localStorage.removeItem('arjun_user'); location.reload(); }
async function clearMemory() {
    if(currentUser) {
        showToast("Clearing Cloud History...");
        await fetch(GAS_URL, { method: 'POST', body: JSON.stringify({ action: "delete_history", email: currentUser }) });
    }
    location.reload();
}

async function fetchHistoryFromGAS() {
    document.getElementById('welcomeScreen').style.display = 'none';
    const c = document.getElementById('chatArea');
    c.innerHTML = '<div style="text-align:center; color:var(--text-muted); margin-top:20px;"><i class="fa-solid fa-spinner fa-spin"></i> Syncing Arjun Network...</div>';
    
    try {
        const res = await fetch(GAS_URL, { method: 'POST', body: JSON.stringify({ action: "get_history", email: currentUser }) });
        const data = await res.json();
        c.innerHTML = '';
        if (data.status === 'success' && data.historyJSON !== "[]") {
            STATE.history = JSON.parse(data.historyJSON);
            STATE.history.forEach(m => appendMsg(m.content, m.role, true));
            setTimeout(scrollChat, 100);
        } else { document.getElementById('welcomeScreen').style.display = 'block'; }
    } catch(e) { c.innerHTML = ''; document.getElementById('welcomeScreen').style.display = 'block'; }
}

function syncHistory() {
    if(currentUser) fetch(GAS_URL, { method: 'POST', body: JSON.stringify({ action: "save_history", email: currentUser, historyJSON: JSON.stringify(STATE.history) }) });
}

// --- VOICE RECOGNITION (Google Speech API) ---
const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
let recognition = null;
let isRecording = false;

if (SpeechRecognition) {
    recognition = new SpeechRecognition();
    recognition.continuous = false; recognition.interimResults = true; recognition.lang = 'en-US';
    
    recognition.onstart = () => { isRecording = true; document.getElementById('voiceBtn').classList.add('recording'); };
    recognition.onresult = (event) => {
        let transcript = '';
        for (let i = event.resultIndex; i < event.results.length; ++i) { transcript += event.results[i][0].transcript; }
        document.getElementById('chatInput').value = transcript; autoGrow(document.getElementById('chatInput'));
    };
    recognition.onend = () => { isRecording = false; document.getElementById('voiceBtn').classList.remove('recording'); };
    recognition.onerror = () => { showToast("Voice recognition failed. Try again."); };
}

function toggleVoice() {
    if(!recognition) return showToast("Voice input not supported in this browser.");
    if(isRecording) recognition.stop(); else recognition.start();
}

// --- MULTI-FILE ATTACHMENT HANDLING ---
function handleFile(input) {
    const file = input.files[0]; if(!file) return;
    const reader = new FileReader();
    
    document.getElementById('fileName').innerText = file.name;
    document.getElementById('fileThumb').innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i>';
    document.getElementById('filePreview').classList.add('active');

    // Categorize: Image vs Text vs Binary(PDF/Doc)
    if (file.type.startsWith('image/')) {
        reader.onload = (e) => {
            STATE.pendingFile = { type: 'image', data: e.target.result, name: file.name };
            document.getElementById('fileThumb').innerHTML = `<img src="${e.target.result}" style="width:100%; height:100%; border-radius:8px; object-fit:cover;">`;
            document.getElementById('fileMeta').innerText = 'Image Ready';
        };
        reader.readAsDataURL(file);
    } else if (file.type.match(/(text|json|csv|xml)/) || file.name.match(/\.(txt|md|csv|json)$/i)) {
        reader.onload = (e) => {
            STATE.pendingFile = { type: 'text', data: e.target.result, name: file.name };
            document.getElementById('fileThumb').innerHTML = '<i class="fa-solid fa-file-code" style="color:var(--accent-blue)"></i>';
            document.getElementById('fileMeta').innerText = 'Text Extracted';
        };
        reader.readAsText(file);
    } else {
        // Fallback for PDFs, DOCs (Sends as Base64. Actual parsing depends on AI backend capability)
        reader.onload = (e) => {
            STATE.pendingFile = { type: 'document', data: e.target.result, name: file.name };
            document.getElementById('fileThumb').innerHTML = '<i class="fa-solid fa-file-pdf" style="color:var(--danger)"></i>';
            document.getElementById('fileMeta').innerText = 'Document Ready';
        };
        reader.readAsDataURL(file);
    }
}
function removeFile() { STATE.pendingFile = null; document.getElementById('filePreview').classList.remove('active'); document.getElementById('fileInput').value = ''; }

// --- CHAT & MARKDOWN SYSTEM ---
function setupMarkdown() {
    const renderer = new marked.Renderer();
    renderer.code = function(code, lang) {
        const valid = (lang && hljs.getLanguage(lang)) ? lang : 'plaintext';
        const highlighted = hljs.highlight(code, { language: valid }).value;
        const safeCode = encodeURIComponent(code);
        return `<div style="position:relative;">
            <button class="copy-btn" onclick="navigator.clipboard.writeText(decodeURIComponent('${safeCode}')).then(()=>{this.innerText='Copied!';setTimeout(()=>this.innerText='Copy Code',2000)})">Copy Code</button>
            <pre><code class="hljs ${valid}">${highlighted}</code></pre>
        </div>`;
    };
    marked.use({ renderer, breaks: true });
}

async function sendMsg() {
    if (STATE.isProcessing) return;
    const inp = document.getElementById('chatInput');
    let msg = inp.value.trim(); 
    
    if (!msg && !STATE.pendingFile) return;

    if (!currentUser) {
        if (guestCount >= 3) { openAuthModal(); return showToast("Guest limit reached. Please Login."); }
        guestCount++; localStorage.setItem('arjun_guest', guestCount.toString());
        document.getElementById('guestCount').innerText = guestCount;
    }

    inp.value = ''; inp.style.height = 'auto';
    document.getElementById('welcomeScreen').style.display = 'none';
    STATE.isProcessing = true; document.getElementById('sendBtn').disabled = true;

    // Handle Attached File Content
    let displayMsg = msg;
    let backendPayloadMsg = msg;
    let attachmentHTML = '';

    if (STATE.pendingFile) {
        if (STATE.pendingFile.type === 'text') {
            backendPayloadMsg = `[User attached file: ${STATE.pendingFile.name}]\nFile Content:\n${STATE.pendingFile.data}\n\nUser Message: ${msg}`;
            attachmentHTML = `<div class="chat-attachment"><i class="fa-solid fa-file-lines"></i> ${STATE.pendingFile.name} (Text Data)</div>`;
        } else if (STATE.pendingFile.type === 'image') {
            // If backend handles image base64, we send it in attachments array (like previous logic).
            attachmentHTML = `<div class="chat-attachment"><i class="fa-solid fa-image"></i> ${STATE.pendingFile.name}</div><img src="${STATE.pendingFile.data}" style="max-width:200px; border-radius:10px; margin-top:10px;">`;
        } else {
            backendPayloadMsg = `[User attached document: ${STATE.pendingFile.name}]\nUser Message: ${msg}`;
            attachmentHTML = `<div class="chat-attachment"><i class="fa-solid fa-file"></i> ${STATE.pendingFile.name}</div>`;
        }
        removeFile();
    }

    const finalUserHTML = attachmentHTML + (msg ? `<p>${msg.replace(/</g,'&lt;')}</p>` : '');
    appendMsg(finalUserHTML, 'user');
    STATE.history.push({ role: 'user', content: backendPayloadMsg }); // Save text to history

    const botNode = appendMsg('<i class="fa-solid fa-circle-notch fa-spin"></i> Processing...', 'bot');
    scrollChat();

    const sysPrompt = "You are Arjun Compound, an advanced AI developed by Abhay Kumar. Always respond in English unless requested otherwise. To generate images, reply with ![Arjun AI Image](https://image.pollinations.ai/prompt/{URL_ENCODED_PROMPT}?width=1024&height=1024&nologo=true&model=flux)";

    try {
        const res = await fetch('/api/chat', {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ message: backendPayloadMsg, system_prompt: sysPrompt, history: STATE.history.slice(0, -1) })
        });

        const reader = res.body.getReader();
        const decoder = new TextDecoder();
        let fullText = "";

        while (true) {
            const { done, value } = await reader.read();
            if (done) break;
            const lines = decoder.decode(value, {stream: true}).split('\n');
            
            for (let line of lines) {
                if (line.startsWith('data: ') && !line.includes('[DONE]')) {
                    try {
                        const dataObj = JSON.parse(line.substring(6));
                        if (dataObj.choices && dataObj.choices[0].delta.content) {
                            fullText += dataObj.choices[0].delta.content;
                            // Regex to clean up think tags if present
                            let cleanText = fullText.replace(/<think>[\s\S]*?(<\/think>|$)/gi, '');
                            botNode.querySelector('.msg-bubble').innerHTML = marked.parse(cleanText) + '<span style="display:inline-block;width:6px;height:12px;background:var(--accent-blue);animation:blink 1s infinite;"></span>';
                            scrollChat();
                        }
                    } catch (e) { }
                }
            }
        }
        
        let finalText = fullText.replace(/<think>[\s\S]*?(<\/think>|$)/gi, '');
        botNode.querySelector('.msg-bubble').innerHTML = marked.parse(finalText);
        STATE.history.push({ role: 'bot', content: fullText });
        syncHistory();

    } catch(err) { botNode.querySelector('.msg-bubble').innerHTML = "<b>Error:</b> Connection failed."; }

    STATE.isProcessing = false; document.getElementById('sendBtn').disabled = false; scrollChat();
}

function sendEx(t) { document.getElementById('chatInput').value = t; sendMsg(); }

function appendMsg(htmlContent, role, isMD = false) {
    const d = document.createElement('div'); d.className = `msg-row ${role}`;
    let displayHtml = isMD ? marked.parse(htmlContent.replace(/<think>[\s\S]*?(<\/think>|$)/gi, '')) : htmlContent;
    d.innerHTML = `<div class="avatar">${role === 'user' ? 'U' : '<i class="fa-solid fa-microchip"></i>'}</div><div class="msg-bubble">${displayHtml}</div>`;
    document.getElementById('chatArea').appendChild(d);
    return d;
}
</script>
</body>
</html>