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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>ContextQuery AI</title>
    
    <!-- Miranda Sans Font -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Miranda+Sans:ital,wght@0,400..700;1,400..700&display=swap" rel="stylesheet">

    <style>
        :root {
            --deep-navy: #010736;
            --dark-navy: #0D1C42;
            --med-blue: #22396F;
            --cream: #FCF1D0;
            
            --bg: var(--cream);
            --sidebar: var(--deep-navy);
            --primary: var(--med-blue);
            --primary-hover: var(--dark-navy);
            --text-main: var(--deep-navy);
            --text-sidebar: var(--cream);
            --text-muted: var(--dark-navy);
            --border: rgba(34, 57, 111, 0.2);
            --danger: #ef4444;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; font-family: "Miranda Sans", sans-serif; }
        body { background: var(--bg); color: var(--text-main); height: 100vh; display: flex; overflow: hidden; }

        /* Layout */
        .sidebar { width: 320px; background: var(--sidebar); border-right: 1px solid var(--deep-navy); display: flex; flex-direction: column; transition: all 0.3s; color: var(--text-sidebar); }
        .main-content { flex: 1; display: flex; flex-direction: column; position: relative; background: var(--bg); }

        /* Sidebar Elements */
        .sidebar-header { padding: 24px 20px; border-bottom: 1px solid rgba(252, 241, 208, 0.1); }
        .sidebar-header h1 { font-size: 20px; font-weight: 700; color: var(--cream); display: flex; align-items: center; gap: 8px; }
        
        .hub-list { flex: 1; overflow-y: auto; padding: 10px; }
        .hub-item { padding: 14px 16px; border-radius: 8px; cursor: pointer; margin-bottom: 4px; transition: background 0.2s; border: 1px solid transparent; }
        .hub-item:hover { background: var(--dark-navy); }
        .hub-item.active { background: var(--med-blue); border-color: var(--cream); }
        .hub-item h3 { font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--cream); margin: 0; }
        
        .sidebar-footer { padding: 20px; border-top: 1px solid rgba(252, 241, 208, 0.1); }

        /* Buttons & Inputs */
        button { width: 100%; padding: 10px 16px; border-radius: 8px; border: none; background: var(--primary); color: var(--cream); font-weight: 600; cursor: pointer; transition: background 0.2s; display: flex; justify-content: center; align-items: center; gap: 8px; }
        button:hover { background: var(--primary-hover); }
        button:disabled { opacity: 0.6; cursor: not-allowed; }
        
        button.secondary { background: transparent; color: var(--cream); border: 1px solid var(--cream); }
        button.secondary:hover { background: rgba(252, 241, 208, 0.1); }
        .auth-card button.secondary { color: var(--med-blue); border: 1px solid var(--med-blue); }
        .auth-card button.secondary:hover { background: rgba(34, 57, 111, 0.05); }
        
        /* Top Header Actions */
        .header-actions { display: flex; gap: 10px; align-items: center; }
        .btn-icon { background: transparent; border: 1px solid var(--med-blue); color: var(--med-blue); padding: 8px 12px; border-radius: 8px; cursor: pointer; transition: all 0.2s; font-size: 16px; width: auto; display: flex; align-items: center; justify-content: center; }
        .btn-icon:hover { background: rgba(34, 57, 111, 0.1); }
        .btn-icon.danger { color: var(--danger); border-color: var(--danger); }
        .btn-icon.danger:hover { background: rgba(239, 68, 68, 0.1); }

        input, textarea { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; outline: none; transition: border 0.2s; background: white; color: var(--deep-navy); }
        input:focus, textarea:focus { border-color: var(--med-blue); box-shadow: 0 0 0 3px rgba(34, 57, 111, 0.1); }

        /* Auth Screen */
        .auth-overlay { 
            position: fixed; inset: 0; 
            background: linear-gradient(-45deg, #FCF1D0, #22396F, #0D1C42, #010736); 
            background-size: 400% 400%; 
            animation: gradientBG 15s ease infinite; 
            display: flex; justify-content: center; align-items: center; z-index: 50; 
        }
        @keyframes gradientBG { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }

        .auth-card { background: #ffffff; padding: 40px; border-radius: 16px; box-shadow: 0 10px 25px rgba(1, 7, 54, 0.15); width: 100%; max-width: 400px; border: 1px solid rgba(34, 57, 111, 0.1); position: relative; color: var(--deep-navy); }
        .auth-card h2 { margin-bottom: 24px; text-align: center; font-size: 24px; font-weight: 700; color: var(--deep-navy); }
        .auth-card input { margin-bottom: 16px; border-color: rgba(34, 57, 111, 0.3); }
        .auth-card textarea { margin-bottom: 16px; resize: vertical; border-color: rgba(34, 57, 111, 0.3); }
        .auth-card .btn-group { display: flex; gap: 12px; margin-top: 16px; }

        .password-wrapper { position: relative; margin-bottom: 16px; }
        .password-wrapper input { margin-bottom: 0; padding-right: 40px; }
        .eye-icon { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); cursor: pointer; font-size: 18px; color: var(--med-blue); user-select: none; }

        .file-upload-wrapper { margin-bottom: 16px; border: 1px dashed var(--med-blue); padding: 16px; border-radius: 8px; text-align: center; background: rgba(34, 57, 111, 0.02); }
        .file-upload-wrapper label { font-size: 14px; font-weight: 600; color: var(--med-blue); cursor: pointer; display: block; }
        .file-upload-wrapper input[type="file"] { display: none; }

        /* Chat Area */
        .chat-header { padding: 20px; border-bottom: 1px solid var(--border); background: var(--cream); display: flex; justify-content: space-between; align-items: center; }
        .chat-header h2 { font-size: 18px; color: var(--deep-navy); }
        .chat-history { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 20px; }
        
        .message { max-width: 80%; padding: 16px; border-radius: 12px; font-size: 15px; line-height: 1.5; animation: fadeIn 0.3s ease; }
        .message.user { align-self: flex-end; background: var(--med-blue); color: var(--cream); border-bottom-right-radius: 4px; }
        .message.ai { align-self: flex-start; background: white; color: var(--deep-navy); border: 1px solid var(--border); border-bottom-left-radius: 4px; box-shadow: 0 2px 5px rgba(1, 7, 54, 0.05); }
        .message pre { white-space: pre-wrap; font-family: inherit; }
        
        .evidence-badge { display: inline-block; margin-top: 10px; padding: 4px 8px; background: var(--cream); border-radius: 4px; font-size: 12px; color: var(--dark-navy); border: 1px solid rgba(34, 57, 111, 0.3); }
        
        .doc-chip { display: inline-flex; align-items: center; gap: 8px; background: #f1f5f9; border: 1px solid #cbd5e1; padding: 8px 12px; border-radius: 8px; font-size: 13px; color: var(--dark-navy); font-weight: 600; margin-bottom: 8px; align-self: flex-end; animation: fadeIn 0.3s ease; }
        
        .chat-input-area { padding: 20px; background: var(--cream); border-top: 1px solid var(--border); }
        .chat-input-wrapper { display: flex; gap: 12px; align-items: center; background: white; padding: 8px; border-radius: 12px; border: 1px solid rgba(34, 57, 111, 0.3); box-shadow: 0 2px 6px rgba(0,0,0,0.02); }
        .chat-input-wrapper input { border: none; box-shadow: none; padding: 8px; flex: 1; }
        .chat-input-wrapper input:focus { box-shadow: none; }
        
        .btn-attach { background: transparent; border: none; color: var(--med-blue); font-size: 20px; padding: 8px; cursor: pointer; width: auto; border-radius: 8px; transition: background 0.2s; }
        .btn-attach:hover { background: rgba(34, 57, 111, 0.1); }
        .btn-send { background: var(--med-blue); border: none; color: var(--cream); padding: 10px 20px; border-radius: 8px; font-weight: 600; cursor: pointer; transition: background 0.2s; width: auto; margin-left: 8px; }
        .btn-send:hover { background: var(--dark-navy); }

        /* Suggested Questions */
        .suggestions-container { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; align-self: center; max-width: 600px; text-align: center; }
        .suggestion-chip { background: white; border: 1px solid var(--med-blue); color: var(--med-blue); padding: 12px 20px; border-radius: 20px; cursor: pointer; transition: all 0.2s; font-weight: 600; }
        .suggestion-chip:hover { background: var(--med-blue); color: var(--cream); }

        /* Empty State */
        .empty-state { flex: 1; display: flex; flex-direction: column; justify-content: center; align-items: center; color: var(--text-muted); text-align: center; padding: 40px; }
        .empty-state h2 { font-size: 24px; color: var(--deep-navy); margin-bottom: 8px; }

        /* Utilities */
        .hidden { display: none !important; }
        .error-msg { color: var(--danger); font-size: 13px; margin-top: 8px; text-align: center; font-weight: 600; }
        .toast { position: fixed; bottom: 20px; right: 20px; padding: 12px 24px; border-radius: 8px; background: var(--deep-navy); color: var(--cream); font-size: 14px; box-shadow: 0 4px 12px rgba(1, 7, 54, 0.3); z-index: 100; transform: translateY(100px); opacity: 0; transition: all 0.3s; }
        .toast.show { transform: translateY(0); opacity: 1; }
        .spinner { width: 16px; height: 16px; border: 2px solid rgba(34, 57, 111, 0.3); border-top-color: var(--med-blue); border-radius: 50%; animation: spin 0.8s linear infinite; }
        .spinner-light { border: 2px solid rgba(252, 241, 208, 0.3); border-top-color: var(--cream); }
        
        @keyframes spin { to { transform: rotate(360deg); } }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
    </style>
</head>
<body>

    <!-- AUTH SCREEN -->
    <div id="auth-screen" class="auth-overlay">
        <div class="auth-card">
            <h2>Welcome to ContextQuery</h2>
            <input type="email" id="auth-email" placeholder="Email" value="user@test.com">
            <div class="password-wrapper">
                <input type="password" id="auth-password" placeholder="Password" value="Password123">
                <span class="eye-icon" onclick="togglePassword('auth-password', 'eye-auth')" id="eye-auth">👁️</span>
            </div>
            <div class="btn-group">
                <button onclick="login()" id="login-btn">Login</button>
                <button onclick="signup()" class="secondary" id="signup-btn">Sign Up</button>
            </div>
            <div id="auth-error" class="error-msg hidden"></div>
        </div>
    </div>

    <!-- MAIN DASHBOARD -->
    <div id="dashboard" class="hidden" style="display:flex; width:100%; height:100%;">
        <!-- SIDEBAR -->
        <div class="sidebar">
            <div class="sidebar-header">
                <h1>🧠 ContextQuery</h1>
            </div>
            <div class="hub-list" id="hub-list"></div>
            <div class="sidebar-footer">
                <button onclick="openCreateModal()" class="secondary">+ New Hub</button>
            </div>
        </div>

        <!-- MAIN CHAT AREA -->
        <div class="main-content">
            <div id="empty-state" class="empty-state">
                <h2>No Hub Selected</h2>
                <p>Select a hub from the sidebar or create a new one to start asking questions.</p>
            </div>

            <div id="chat-container" class="hidden" style="display:flex; flex-direction:column; height:100%;">
                <div class="chat-header">
                    <h2 id="chat-title">Hub Name</h2>
                    <!-- Top Right Actions -->
                    <div class="header-actions">
                        <button class="btn-icon" onclick="refreshHub()" title="Sync Data">🔄</button>
                        <button class="btn-icon danger" onclick="deleteHub()" title="Delete Hub">🗑️</button>
                        <button class="btn-icon" onclick="openSettingsModal()" title="Account Settings">⚙️</button>
                        <button class="btn-icon" onclick="logout()" title="Logout">🚪</button>
                    </div>
                </div>
                
                <div class="chat-history" id="chat-history"></div>
                
                <div class="chat-input-area">
                    <div class="chat-input-wrapper">
                        <input type="file" id="pdf-upload" accept=".pdf,.txt,.md" style="display:none" onchange="uploadDocument(event)">
                        <button class="btn-attach" onclick="document.getElementById('pdf-upload').click()" id="attach-btn" title="Attach Document">📎</button>
                        
                        <input type="text" id="query-input" placeholder="Ask a question or attach a document..." onkeypress="handleKeyPress(event)">
                        
                        <button class="btn-send" onclick="askQuestion()" id="ask-btn">Ask</button>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- CREATE HUB MODAL -->
    <div id="create-modal" class="auth-overlay hidden" style="background: rgba(1, 7, 54, 0.6); backdrop-filter: blur(4px);">
        <div class="auth-card">
            <h2>Create New Hub</h2>
            <input type="text" id="new-hub-name" placeholder="Hub Name (e.g., HR Policies)">
            <textarea id="new-hub-content" rows="3" placeholder="Paste text data here (Optional)..."></textarea>
            
            <div class="file-upload-wrapper">
                <label for="new-hub-file">📄 Or click to upload a PDF / Text file</label>
                <input type="file" id="new-hub-file" accept=".pdf,.txt,.md">
                <div id="file-name-display" style="font-size: 12px; color: var(--text-muted); margin-top: 8px;">No file selected</div>
            </div>

            <div class="btn-group">
                <button onclick="createHub()" id="create-hub-btn">Create Hub</button>
                <button onclick="closeCreateModal()" class="secondary">Cancel</button>
            </div>
            <div id="create-error" class="error-msg hidden"></div>
        </div>
    </div>

    <!-- SETTINGS / CHANGE PASSWORD MODAL -->
    <div id="settings-modal" class="auth-overlay hidden" style="background: rgba(1, 7, 54, 0.6); backdrop-filter: blur(4px);">
        <div class="auth-card">
            <h2>Account Settings</h2>
            <div style="margin-bottom: 16px;">
                <label style="font-size: 14px; font-weight: 600; margin-bottom: 8px; display: block;">Change Password</label>
                <div class="password-wrapper">
                    <input type="password" id="current-password" placeholder="Current Password">
                </div>
                <div class="password-wrapper">
                    <input type="password" id="new-password" placeholder="New Password">
                </div>
            </div>
            <div class="btn-group">
                <button onclick="changePassword()" id="change-pass-btn">Update Password</button>
                <button onclick="closeSettingsModal()" class="secondary">Cancel</button>
            </div>
            <div id="settings-error" class="error-msg hidden"></div>
            <div id="settings-success" class="error-msg hidden" style="color: #16a34a;"></div>
        </div>
    </div>

    <div id="toast" class="toast">Notification</div>

<script>
    const API = "http://localhost:8000/api/v1";
    let currentHubId = null;
    let allHubs = []; 
    let chatHistories = {}; 

    // --- UTILS & UI ---
    function showToast(msg) { const toast = document.getElementById("toast"); toast.textContent = msg; toast.classList.add("show"); setTimeout(() => toast.classList.remove("show"), 3000); }
    function showError(id, msg) { const el = document.getElementById(id); el.textContent = msg; el.classList.remove("hidden"); el.style.color = "var(--danger)"; }
    function showSuccess(id, msg) { const el = document.getElementById(id); el.textContent = msg; el.classList.remove("hidden"); el.style.color = "#16a34a"; }
    function hideError(id) { document.getElementById(id).classList.add("hidden"); }

    function togglePassword(inputId, iconId) {
        const input = document.getElementById(inputId);
        const icon = document.getElementById(iconId);
        if (input.type === "password") { input.type = "text"; icon.textContent = "🙈"; } 
        else { input.type = "password"; icon.textContent = "👁️"; }
    }

    function setLoading(btnId, isLoading, text = "Loading...", isLight = false) {
        const btn = document.getElementById(btnId);
        if (isLoading) { 
            btn.dataset.original = btn.innerHTML; 
            btn.innerHTML = `<div class="spinner ${isLight ? 'spinner-light' : ''}"></div> ${text}`; 
            btn.disabled = true; 
        } else { 
            btn.innerHTML = btn.dataset.original; 
            btn.disabled = false; 
        }
    }

    // --- AUTHENTICATION ---
    function getToken() { return sessionStorage.getItem("token"); }
    function setToken(token) { sessionStorage.setItem("token", token); showDashboard(); }
    function logout() { sessionStorage.removeItem("token"); location.reload(); }

    async function apiFetch(path, options = {}) {
        const token = getToken();
        const headers = { ...(token && { "Authorization": `Bearer ${token}` }), ...options.headers };
        if (!(options.body instanceof FormData)) headers["Content-Type"] = "application/json";
        
        try {
            const res = await fetch(`${API}${path}`, { ...options, headers });
            if (res.status === 401) { logout(); return; }
            if (res.status === 204) return {}; // Handle DELETE success
            const data = await res.json();
            if (!res.ok) throw new Error(data.error?.message || "Request failed");
            return data;
        } catch (err) {
            if (err.message === "Failed to fetch") throw new Error("Failed to fetch. Is the backend running?");
            throw err;
        }
    }

    async function login() {
        const email = document.getElementById("auth-email").value;
        const password = document.getElementById("auth-password").value;
        hideError("auth-error"); setLoading("login-btn", true, "Logging in...", true);
        try {
            const data = await apiFetch("/auth/login", { method: "POST", body: JSON.stringify({ email, password }) });
            setToken(data.access_token);
        } catch (e) { showError("auth-error", e.message); setLoading("login-btn", false, "", true); }
    }

    async function signup() {
        const email = document.getElementById("auth-email").value;
        const password = document.getElementById("auth-password").value;
        hideError("auth-error"); setLoading("signup-btn", true, "Signing up...");
        try {
            await apiFetch("/auth/signup", { method: "POST", body: JSON.stringify({ email, password }) });
            showToast("Account created! Please log in.");
            document.getElementById("login-btn").click();
        } catch (e) { showError("auth-error", e.message); setLoading("signup-btn", false); }
    }

    function showDashboard() { 
        document.getElementById("auth-screen").classList.add("hidden"); 
        document.getElementById("dashboard").classList.remove("hidden"); 
        loadHubs(); 
    }

    // --- SETTINGS & PASSWORD ---
    function openSettingsModal() { 
        document.getElementById("settings-modal").classList.remove("hidden"); 
        document.getElementById("current-password").value = "";
        document.getElementById("new-password").value = "";
        hideError("settings-error");
        hideError("settings-success");
    }
    function closeSettingsModal() { document.getElementById("settings-modal").classList.add("hidden"); }

    async function changePassword() {
        const currentPass = document.getElementById("current-password").value;
        const newPass = document.getElementById("new-password").value;
        hideError("settings-error"); hideError("settings-success");
        
        if (!currentPass || !newPass) return showError("settings-error", "Both fields are required");
        
        setLoading("change-pass-btn", true, "Updating...");
        try {
            await apiFetch("/auth/change-password", {
                method: "POST",
                body: JSON.stringify({ current_password: currentPass, new_password: newPass })
            });
            showSuccess("settings-success", "Password updated successfully!");
            setTimeout(closeSettingsModal, 1500);
        } catch (e) {
            showError("settings-error", e.message);
        } finally {
            setLoading("change-pass-btn", false);
        }
    }

    // --- HUBS & CREATION ---
    function openCreateModal() { 
        document.getElementById("create-modal").classList.remove("hidden"); 
        document.getElementById("new-hub-file").value = "";
        document.getElementById("file-name-display").textContent = "No file selected";
    }
    function closeCreateModal() { 
        document.getElementById("create-modal").classList.add("hidden"); 
        hideError("create-error"); 
    }

    document.getElementById("new-hub-file").addEventListener("change", (e) => {
        const fileName = e.target.files[0] ? e.target.files[0].name : "No file selected";
        document.getElementById("file-name-display").textContent = fileName;
    });

    async function createHub() {
        const name = document.getElementById("new-hub-name").value;
        const content = document.getElementById("new-hub-content").value;
        const file = document.getElementById("new-hub-file").files[0];
        
        if (!name) return showError("create-error", "Name is required");
        
        hideError("create-error"); 
        setLoading("create-hub-btn", true, "Creating Hub...", true);
        
        try {
            const key = crypto.randomUUID(); 
            const hubRes = await apiFetch("/hubs", { 
                method: "POST", 
                headers: { "X-Idempotency-Key": key }, 
                body: JSON.stringify({ name, content }) 
            });
            const newHubId = hubRes.id;

            if (file) {
                setLoading("create-hub-btn", true, "Uploading File...", true);
                const formData = new FormData();
                formData.append("file", file);
                const uploadKey = crypto.randomUUID();
                const uploadRes = await apiFetch(`/hubs/${newHubId}/documents`, {
                    method: "POST",
                    headers: { "X-Idempotency-Key": uploadKey },
                    body: formData
                });
                await pollDocumentProcess(newHubId, uploadRes.id, "create-hub-btn", true);
            }

            showToast("Hub created successfully!"); 
            closeCreateModal();
            document.getElementById("new-hub-name").value = ""; 
            document.getElementById("new-hub-content").value = "";
            
            await loadHubs();
            const newHubObj = allHubs.find(h => h.id === newHubId);
            if (newHubObj) selectHub(newHubObj);
            
        } catch (e) { 
            showError("create-error", e.message); 
        } finally { 
            setLoading("create-hub-btn", false); 
        }
    }

    async function loadHubs() {
        try {
            const data = await apiFetch("/hubs"); 
            allHubs = data.items;
            const list = document.getElementById("hub-list"); list.innerHTML = "";
            if (allHubs.length === 0) { 
                list.textContent = "No hubs yet. Create one below!"; list.style.padding = "20px"; list.style.color = "rgba(252, 241, 208, 0.5)"; list.style.textAlign = "center"; return; 
            }
            
            allHubs.forEach(hub => {
                const div = document.createElement("div"); 
                div.className = "hub-item" + (currentHubId === hub.id ? " active" : "");
                const title = document.createElement("h3"); title.textContent = hub.name;
                div.appendChild(title); 
                div.onclick = () => selectHub(hub); 
                list.appendChild(div);
            });
        } catch (e) { showToast("Error loading hubs: " + e.message); }
    }

    function selectHub(hub) {
        currentHubId = hub.id; 
        document.getElementById("empty-state").classList.add("hidden");
        document.getElementById("chat-container").classList.remove("hidden"); 
        document.getElementById("chat-title").textContent = hub.name;
        loadHubs(); 
        renderChat(hub.id, hub.suggested_questions);
    }

    // --- DELETE & REFRESH ---
    async function deleteHub() {
        if (!currentHubId) return;
        if (!confirm("Are you sure you want to delete this hub? This will permanently delete all documents and embeddings inside it.")) return;

        try {
            await apiFetch(`/hubs/${currentHubId}`, { method: "DELETE" });
            showToast("Hub deleted successfully.");
            currentHubId = null;
            document.getElementById("chat-container").classList.add("hidden");
            document.getElementById("empty-state").classList.remove("hidden");
            loadHubs();
        } catch (e) {
            showToast("Failed to delete hub: " + e.message);
        }
    }

    async function refreshHub() {
        if (!currentHubId) return;
        showToast("Syncing latest data...");
        await loadHubs();
        const hub = allHubs.find(h => h.id === currentHubId);
        if (hub) {
            document.getElementById("chat-title").textContent = hub.name;
        }
        showToast("Synced.");
    }

    // --- CHAT RENDERING ---
    function renderChat(hubId, suggestedQuestions = []) {
        const history = document.getElementById("chat-history");
        history.innerHTML = ""; 
        
        if (chatHistories[hubId] && chatHistories[hubId].length > 0) {
            chatHistories[hubId].forEach(msg => {
                if (msg.role === "doc") appendDocChipToDOM(msg.filename);
                else appendMessageToDOM(msg.role, msg.text, msg.evidence);
            });
        } 
        else if (suggestedQuestions && suggestedQuestions.length > 0) {
            const suggestionsDiv = document.createElement("div");
            suggestionsDiv.className = "suggestions-container";
            
            const header = document.createElement("p");
            header.textContent = "Try asking one of these to get started:";
            header.style.color = "var(--text-muted)";
            header.style.fontWeight = "600";
            suggestionsDiv.appendChild(header);

            suggestedQuestions.forEach(q => {
                const btn = document.createElement("button");
                btn.className = "suggestion-chip";
                btn.textContent = q;
                btn.onclick = () => {
                    document.getElementById("query-input").value = q;
                    askQuestion();
                };
                suggestionsDiv.appendChild(btn);
            });
            history.appendChild(suggestionsDiv);
        }
    }

    function appendMessageToDOM(role, text, evidence = null) {
        const history = document.getElementById("chat-history");
        const msgDiv = document.createElement("div");
        msgDiv.className = `message ${role}`;
        
        const pre = document.createElement("pre");
        pre.textContent = text;
        msgDiv.appendChild(pre);
        
        if (evidence) {
            const badge = document.createElement("span");
            badge.className = "evidence-badge";
            badge.textContent = `Evidence: "${evidence}"`;
            msgDiv.appendChild(badge);
        }
        history.appendChild(msgDiv);
        history.scrollTop = history.scrollHeight;
    }

    function appendDocChipToDOM(filename) {
        const history = document.getElementById("chat-history");
        const chip = document.createElement("div");
        chip.className = "doc-chip";
        chip.innerHTML = `<span>📄</span> <span>${filename}</span>`;
        history.appendChild(chip);
        history.scrollTop = history.scrollHeight;
    }

    // --- UPLOAD & POLLING ---
    async function uploadDocument(event) {
        const file = event.target.files[0];
        if (!file || !currentHubId) return;
        
        setLoading("attach-btn", true, "⏳");
        const formData = new FormData();
        formData.append("file", file);
        
        try {
            const key = crypto.randomUUID();
            const uploadRes = await apiFetch(`/hubs/${currentHubId}/documents`, {
                method: "POST",
                headers: { "X-Idempotency-Key": key },
                body: formData
            });
            
            if (!chatHistories[currentHubId]) chatHistories[currentHubId] = [];
            chatHistories[currentHubId].push({ role: "doc", filename: file.name });
            appendDocChipToDOM(file.name);
            
            showToast("Document uploaded. Processing...");
            await pollDocumentProcess(currentHubId, uploadRes.id, "attach-btn");
            
        } catch (e) {
            showToast("Upload failed: " + e.message);
            setLoading("attach-btn", false, "📎");
        }
        event.target.value = ""; 
    }

    async function pollDocumentProcess(hubId, docId, btnId, isLight = false) {
        let isReady = false;
        while (!isReady) {
            setLoading(btnId, true, isLight ? "Processing..." : "⏳", isLight);
            try {
                const doc = await apiFetch(`/hubs/${hubId}/documents/${docId}/process`, { method: "POST" });
                
                if (doc.status === "ready") {
                    isReady = true;
                    showToast("Document ready!");
                } else if (doc.status === "failed") {
                    throw new Error(doc.error_message || "Processing failed");
                } else {
                    await new Promise(r => setTimeout(r, 2000));
                }
            } catch (e) {
                showToast("Processing error: " + e.message);
                break;
            }
        }
        setLoading(btnId, false, isLight ? "" : "📎", isLight);
        if(!isLight) document.getElementById(btnId).innerHTML = "📎"; 
        loadHubs(); 
    }

    // --- QUERY ---
    function handleKeyPress(e) { if (e.key === "Enter") askQuestion(); }

    async function askQuestion() {
        const input = document.getElementById("query-input"); 
        const question = input.value.trim();
        if (!question || !currentHubId) return;
        
        input.value = ""; 
        
        if (!chatHistories[currentHubId]) chatHistories[currentHubId] = [];
        if (chatHistories[currentHubId].length === 0) {
            document.getElementById("chat-history").innerHTML = "";
        }

        chatHistories[currentHubId].push({ role: "user", text: question });
        appendMessageToDOM("user", question);

        setLoading("ask-btn", true, "Thinking...");
        try {
            const data = await apiFetch(`/hubs/${currentHubId}/query`, {
                method: "POST", body: JSON.stringify({ question })
            });
            
            chatHistories[currentHubId].push({ role: "ai", text: data.answer, evidence: data.evidence });
            appendMessageToDOM("ai", data.answer, data.evidence);
            
        } catch (e) {
            appendMessageToDOM("ai", "Error: " + e.message);
        } finally { 
            setLoading("ask-btn", false); 
        }
    }

    if (getToken()) showDashboard();
</script>
</body>
</html>