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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Assistant IA</title>
    <!-- Using Tailwind via CDN -->
    <script src="https://cdn.tailwindcss.com?plugins=forms,typography"></script>
    <!-- Using Marked.js via CDN -->
    <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
    <style>
        :root {
            --primary-blue: #1E40AF; /* blue-800 */
            --light-blue: #EFF6FF; /* blue-50 */
            --accent-blue: #3B82F6; /* blue-500 */
            --text-dark: #111827; /* gray-900 */
            --text-light: #4B5563; /* gray-600 */
            --bg-user: #2563EB; /* blue-600 */
            --bg-assistant: #FFFFFF;
            --border-color: #E5E7EB; /* gray-200 */
        }

        body {
            background: linear-gradient(135deg, var(--light-blue) 0%, #ffffff 100%);
            min-height: 100vh;
            font-family: 'Inter', sans-serif; /* Consider adding Inter font via Google Fonts */
        }

        /* Enhanced Glass Effect */
        .glass-effect {
            background: rgba(255, 255, 255, 0.8); /* Slightly less transparent */
            backdrop-filter: blur(12px) saturate(180%); /* Increased blur and saturation */
            -webkit-backdrop-filter: blur(12px) saturate(180%);
            border: 1px solid rgba(230, 230, 230, 0.3); /* Softer border */
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15); /* Softer shadow */
        }

        /* Message Styling */
        .message-container {
            display: flex;
            margin-bottom: 1rem;
            opacity: 0;
            transform: translateY(10px);
            animation: fadeIn 0.5s ease forwards;
        }

        @keyframes fadeIn {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message-bubble {
            max-width: 75%;
            padding: 0.75rem 1rem; /* 12px 16px */
            border-radius: 1rem; /* large */
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            word-wrap: break-word; /* Ensure long words break */
            overflow-wrap: break-word; /* Modern standard */
        }

        .message-container.user {
            justify-content: flex-end;
        }
        .message-container.assistant {
            justify-content: flex-start;
        }

        .message-bubble.user {
            background-color: var(--bg-user);
            color: white;
            border-bottom-right-radius: 0.25rem; /* small */
        }
        .message-bubble.assistant {
            background-color: var(--bg-assistant);
            color: var(--text-dark);
            border: 1px solid var(--border-color);
            border-bottom-left-radius: 0.25rem; /* small */
        }
        /* Styling for code blocks generated by marked.js */
        .message-bubble pre {
            background-color: #f3f4f6; /* gray-100 */
            color: #1f2937; /* gray-800 */
            padding: 1em;
            border-radius: 0.5rem; /* md */
            overflow-x: auto;
            font-family: 'Courier New', Courier, monospace;
            font-size: 0.9em;
            margin: 0.5em 0;
        }
        .message-bubble code:not(pre code) { /* Inline code */
             background-color: #e5e7eb; /* gray-200 */
             padding: 0.2em 0.4em;
             border-radius: 0.25rem;
             font-size: 0.9em;
        }
        .message-bubble ul, .message-bubble ol {
            padding-left: 1.5rem;
            margin-top: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .message-bubble li > p { /* Prevent extra margins inside list items */
             margin-bottom: 0.25rem;
        }
        .message-bubble blockquote {
             border-left: 4px solid var(--accent-blue);
             padding-left: 1rem;
             margin-left: 0;
             color: var(--text-light);
             font-style: italic;
        }

        /* Quick Actions */
        .quick-action {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
            transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            color: white;
            font-weight: 500;
        }
        .quick-action:hover {
            transform: translateY(-3px) scale(1.03);
            box-shadow: 0 6px 15px rgba(59, 130, 246, 0.35);
        }
        .quick-action:active {
            transform: translateY(-1px) scale(0.98);
            box-shadow: 0 3px 8px rgba(59, 130, 246, 0.25);
        }
        .quick-action svg {
            transition: transform 0.2s ease-in-out;
        }
        .quick-action:hover svg {
             transform: rotate(-5deg) scale(1.1);
        }

        /* Input Area */
        .custom-input {
            border: 2px solid var(--border-color);
            transition: all 0.3s ease;
            color: var(--text-dark);
            padding-right: 3rem; /* Space for potential icons inside input */
        }
        .custom-input::placeholder {
            color: #9ca3af; /* gray-400 */
        }
        .custom-input:focus {
            border-color: var(--accent-blue);
            box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
            outline: none;
        }
        /* Send Button */
        #sendButton {
             /* Inherits quick-action styles */
             min-width: 80px; /* Ensure button doesn't shrink too much */
        }

        /* Loading Spinner */
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .loading-spinner {
            border: 4px solid rgba(59, 130, 246, 0.2); /* Lighter border */
            border-top-color: var(--accent-blue); /* Spinner color */
            animation: spin 1s linear infinite;
        }
        #loadingOverlay {
             transition: opacity 0.3s ease-in-out;
        }

        /* File Upload Preview */
        .file-upload-area {
            background: rgba(59, 130, 246, 0.05);
            border: 2px dashed var(--accent-blue);
            transition: all 0.3s ease;
        }
        .file-upload-area:hover {
            background: rgba(59, 130, 246, 0.1);
            border-color: var(--primary-blue);
        }
        #fileName {
            font-size: 0.9rem;
            font-style: italic;
        }

        /* Scrollbar */
        #chatMessages::-webkit-scrollbar {
            width: 8px;
        }
        #chatMessages::-webkit-scrollbar-track {
            background: var(--light-blue);
            border-radius: 10px;
        }
        #chatMessages::-webkit-scrollbar-thumb {
            background-color: var(--accent-blue);
            border-radius: 10px;
            border: 2px solid var(--light-blue);
        }
        #chatMessages {
            scrollbar-width: thin;
            scrollbar-color: var(--accent-blue) var(--light-blue);
        }
    </style>
</head>
<body class="text-gray-800">
    <div class="container mx-auto px-4 py-8 max-w-4xl"> <!-- Centered & Max Width -->

        <!-- Header -->
        <header class="glass-effect rounded-2xl p-4 md:p-6 mb-6 flex flex-col sm:flex-row justify-between items-center">
            <div class="flex items-center space-x-3 mb-4 sm:mb-0">
                <div class="w-12 h-12 rounded-full bg-gradient-to-br from-blue-600 to-blue-800 flex items-center justify-center shadow-md">
                    <svg class="w-7 h-7 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 10h.01M12 10h.01M16 10h.01M9 16H5a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v8a2 2 0 01-2 2h-5l-5 5v-5z"></path>
                    </svg>
                </div>
                <div>
                    <h1 class="text-xl md:text-2xl font-bold text-blue-900">Assistant IA</h1>
                    <p class="text-sm text-green-600 font-medium">En ligne</p>
                </div>
            </div>
            <div class="flex items-center space-x-3">
                <label class="flex items-center space-x-2 text-sm text-blue-900 cursor-pointer hover:text-blue-700">
                    <input type="checkbox" id="webSearchToggle" class="form-checkbox h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded">
                    <span>Recherche web</span>
                </label>
                <button id="clearChatButton" title="Effacer la conversation" class="bg-red-500 hover:bg-red-600 text-white px-3 py-2 rounded-lg transition-colors duration-200 text-sm font-medium flex items-center space-x-1">
                     <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path></svg>
                    <span>Effacer</span>
                </button>
            </div>
        </header>

        <!-- Quick Actions (Optional: Keep or remove based on preference) -->
        <div class="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-5 gap-3 mb-6">
             <!-- Example Quick Action Button -->
            <button data-prompt="Effectuez une recherche sur " class="quick-action p-3 rounded-xl flex flex-col sm:flex-row items-center justify-center space-y-1 sm:space-y-0 sm:space-x-2 text-xs sm:text-sm">
                <svg class="w-5 h-5 mb-1 sm:mb-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"/></svg>
                <span>Recherche</span>
            </button>
             <button data-prompt="Donnez-moi des idées sur " class="quick-action p-3 rounded-xl flex flex-col sm:flex-row items-center justify-center space-y-1 sm:space-y-0 sm:space-x-2 text-xs sm:text-sm">
                <svg class="w-5 h-5 mb-1 sm:mb-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"/></svg>
                <span>Brainstorm</span>
            </button>
            <button data-prompt="Analysez les données suivantes : " class="quick-action p-3 rounded-xl flex flex-col sm:flex-row items-center justify-center space-y-1 sm:space-y-0 sm:space-x-2 text-xs sm:text-sm">
                <svg class="w-5 h-5 mb-1 sm:mb-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z"/></svg>
                <span>Analyse</span>
            </button>
             <button data-prompt="Créez une image de " class="quick-action p-3 rounded-xl flex flex-col sm:flex-row items-center justify-center space-y-1 sm:space-y-0 sm:space-x-2 text-xs sm:text-sm">
                <svg class="w-5 h-5 mb-1 sm:mb-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z"/></svg>
                <span>Images</span>
            </button>
            <button data-prompt="Écrivez du code pour " class="quick-action p-3 rounded-xl flex flex-col sm:flex-row items-center justify-center space-y-1 sm:space-y-0 sm:space-x-2 text-xs sm:text-sm">
                <svg class="w-5 h-5 mb-1 sm:mb-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4"/></svg>
                <span>Code</span>
            </button>
        </div>

        <!-- Chat Messages -->
        <div id="chatMessages" class="glass-effect rounded-2xl p-4 md:p-6 mb-6 h-[50vh] md:h-[60vh] overflow-y-auto space-y-4">
            <!-- Messages Rendered by Server (Jinja2) -->
            {% for message in messages %}
                <div class="message-container {{ message.role }}"> {# Use role for class #}
                    <div class="message-bubble {{ message.role }}">
                         {# Use marked.parse and sanitize output #}
                         {{ message.content | safe }} {# Assume backend sends sanitized HTML or use JS #}
                    </div>
                </div>
            {% endfor %}
            <!-- New messages will be appended here by JavaScript -->
        </div>

        <!-- Input Area -->
        <div class="glass-effect rounded-2xl p-4 md:p-6">
            <!-- File Upload Area -->
            <div class="mb-4">
                <input type="file" id="fileUpload" class="hidden" accept=".jpg,.jpeg,.png,.gif,.webp,.heic,.heif,.pdf,.txt,.mp3,.wav,.ogg,.mp4,.mov,.avi">
                <label for="fileUpload" class="file-upload-area p-4 rounded-xl flex flex-col items-center justify-center cursor-pointer hover:bg-blue-50 text-center">
                    <svg class="w-8 h-8 text-blue-500 mb-2" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12"></path>
                    </svg>
                    <span id="fileName" class="text-blue-600 text-sm">Cliquez ou déposez un fichier ici (Max 100Mo)</span>
                     <span id="uploadStatus" class="text-xs text-gray-500 mt-1"></span>
                </label>
            </div>

            <!-- Text Input & Send Button -->
            <div class="flex items-center space-x-3">
                <div class="relative flex-grow">
                    <textarea id="messageInput"
                        class="custom-input w-full rounded-xl px-4 py-3 pr-12 text-sm md:text-base resize-none border-gray-300 focus:border-blue-500 focus:ring focus:ring-blue-200 focus:ring-opacity-50"
                        placeholder="Écrivez votre message... (Shift+Enter pour nouvelle ligne)"
                        rows="1"
                        style="min-height: 48px; max-height: 150px;"
                        oninput="this.style.height = 'auto'; this.style.height = (this.scrollHeight) + 'px';"
                    ></textarea>
                </div>
                <button id="sendButton" title="Envoyer le message" class="quick-action px-4 py-3 rounded-xl flex items-center justify-center self-end transition-transform duration-150 ease-in-out">
                     <svg class="w-6 h-6 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 19l9 2-9-18-9 18 9-2zm0 0v-8"></path></svg>
                     <span class="sr-only">Envoyer</span>
                </button>
            </div>
        </div>

        <footer class="text-center mt-6 text-xs text-gray-500">
             Propulsé par Gemini | Conçu par Youssouf
        </footer>
    </div>

    <!-- Loading Overlay -->
    <div id="loadingOverlay" class="fixed inset-0 bg-white bg-opacity-75 backdrop-filter backdrop-blur-sm hidden items-center justify-center z-50" style="display: none;">
        <div class="loading-spinner w-16 h-16 rounded-full"></div>
        <span id="loadingText" class="ml-4 text-blue-800 font-medium">Chargement...</span>
    </div>

    <script>
        const messageInput = document.getElementById('messageInput');
        const chatMessages = document.getElementById('chatMessages');
        const webSearchToggle = document.getElementById('webSearchToggle');
        const fileUpload = document.getElementById('fileUpload');
        const fileNameLabel = document.getElementById('fileName');
        const uploadStatusLabel = document.getElementById('uploadStatus');
        const loadingOverlay = document.getElementById('loadingOverlay');
        const loadingText = document.getElementById('loadingText');
        const sendButton = document.getElementById('sendButton');
        const clearChatButton = document.getElementById('clearChatButton');

        let currentFileName = null; // Track uploaded file name

        // --- Utility Functions ---
        function showLoading(text = "Chargement...") {
            loadingText.textContent = text;
            loadingOverlay.style.display = 'flex'; // Use style.display
            loadingOverlay.style.opacity = 1;
        }

        function hideLoading() {
             // Add a small delay for smoother transition if needed
            loadingOverlay.style.opacity = 0;
            setTimeout(() => {
               loadingOverlay.style.display = 'none';
            }, 300); // Match CSS transition duration
        }

        function sanitizeHTML(str) {
            // Basic sanitizer (consider a more robust library like DOMPurify for production)
            const temp = document.createElement('div');
            temp.textContent = str;
            return temp.innerHTML;
        }

        function addMessage(content, role = 'assistant') {
            const messageContainer = document.createElement('div');
            messageContainer.className = `message-container ${role}`; // 'user' or 'assistant'

            const messageBubble = document.createElement('div');
            messageBubble.className = `message-bubble ${role}`;

            // Use marked.parse for Markdown rendering
            // Ensure marked is loaded before this script runs
            if (typeof marked === 'undefined') {
                 console.error("Marked.js library is not loaded.");
                 messageBubble.textContent = content; // Fallback to plain text
            } else {
                 // Basic sanitization - FOR PRODUCTION, USE A ROBUST LIBRARY (e.g., DOMPurify)
                 // marked.parse might return HTML, ensure it's safe before inserting
                 const rawHtml = marked.parse(content);
                 // Simple placeholder for sanitization concept:
                 // const sanitizedHtml = yourSanitizationFunction(rawHtml);
                 // For now, we'll trust the backend/marked output for this example, but BE CAREFUL.
                 messageBubble.innerHTML = rawHtml; // Potentially unsafe if content isn't trusted
            }

            messageContainer.appendChild(messageBubble);
            chatMessages.appendChild(messageContainer);

            // Smooth scroll to the bottom
            chatMessages.scrollTo({ top: chatMessages.scrollHeight, behavior: 'smooth' });
        }

        // --- Event Listeners ---
        sendButton.addEventListener('click', sendMessage);
        messageInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault(); // Prevent default Enter behavior (new line)
                sendMessage();
            }
        });

        clearChatButton.addEventListener('click', clearChat);

        fileUpload.addEventListener('change', handleFileUpload);

        document.querySelectorAll('.quick-action[data-prompt]').forEach(button => {
            button.addEventListener('click', () => {
                const promptText = button.getAttribute('data-prompt');
                messageInput.value = promptText;
                messageInput.focus();
                // Auto-resize textarea after setting value
                messageInput.style.height = 'auto';
                messageInput.style.height = (messageInput.scrollHeight) + 'px';
                // Optional: Place cursor at the end
                messageInput.setSelectionRange(promptText.length, promptText.length);
            });
        });


        // --- Core Functions ---
        async function sendMessage() {
            const messageText = messageInput.value.trim();
            if (!messageText && !currentFileName) { // Don't send empty messages unless a file is context
                 console.log("Empty message, not sending.");
                 return;
            }

            // Add user message optimistically to UI
            // Use the raw text, backend response will be formatted
            addMessage(sanitizeHTML(messageText), 'user');
            const userMessageToSend = messageText; // Keep the original text for sending
            messageInput.value = ''; // Clear input
            messageInput.style.height = '48px'; // Reset textarea height

            showLoading("Envoi en cours...");

            try {
                const response = await fetch('/send_message', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'Accept': 'application/json' // Explicitly accept JSON
                    },
                    body: JSON.stringify({
                        message: userMessageToSend,
                        web_search: webSearchToggle.checked
                        // File info is now handled server-side via session
                    })
                });

                 hideLoading(); // Hide loading indicator once response headers are received

                if (!response.ok) {
                     // Try to get error message from JSON response body
                     let errorMsg = `Erreur HTTP: ${response.status}`;
                     try {
                          const errorData = await response.json();
                          errorMsg = `Erreur: ${errorData.error || response.statusText}`;
                     } catch (jsonError) {
                           // If response is not JSON, use statusText
                          console.warn("Could not parse error response as JSON:", jsonError);
                     }
                     addMessage(errorMsg, 'assistant'); // Display error in chat
                     console.error("Send message error:", errorMsg);
                     return; // Stop processing on error
                }

                const data = await response.json();

                if (data.error) {
                    addMessage(`Erreur: ${sanitizeHTML(data.error)}`, 'assistant');
                } else if (data.response) {
                    addMessage(data.response, 'assistant'); // Add AI response (already Markdown processed if backend does it, or process here)
                     // If files were processed, reset the file indicator?
                     // Decide based on whether files persist across messages
                     // resetFileUploadUI(); // Uncomment if needed
                } else {
                     addMessage("Réponse inattendue du serveur.", 'assistant');
                }

            } catch (error) {
                hideLoading();
                console.error('Erreur lors de l\'envoi du message:', error);
                addMessage(`Erreur de connexion ou de traitement: ${sanitizeHTML(error.message)}`, 'assistant');
            }
        }

        async function handleFileUpload(event) {
            const file = event.target.files[0];
            if (!file) return;

            // Basic validation (optional: add more checks like type if needed)
            const maxSize = 100 * 1024 * 1024; // 100MB
            if (file.size > maxSize) {
                uploadStatusLabel.textContent = `Fichier trop volumineux (Max ${maxSize / 1024 / 1024}Mo).`;
                uploadStatusLabel.style.color = 'red';
                fileUpload.value = ''; // Clear the file input
                return;
            }


            fileNameLabel.textContent = `Fichier sélectionné : ${file.name}`;
            uploadStatusLabel.textContent = 'Upload en cours...';
            uploadStatusLabel.style.color = 'gray';
            showLoading("Téléversement du fichier...");

            const formData = new FormData();
            formData.append('file', file);

            try {
                const response = await fetch('/upload', {
                    method: 'POST',
                    body: formData
                    // No 'Content-Type' header needed, browser sets it for FormData
                });

                hideLoading();
                const data = await response.json();

                if (!response.ok || data.error) {
                    const errorMsg = data.error || `Erreur HTTP ${response.status}`;
                    uploadStatusLabel.textContent = `Échec: ${sanitizeHTML(errorMsg)}`;
                    uploadStatusLabel.style.color = 'red';
                    fileNameLabel.textContent = 'Cliquez ou déposez un fichier ici (Max 100Mo)'; // Reset label
                    fileUpload.value = ''; // Clear the file input
                    currentFileName = null;
                    console.error("File upload error:", errorMsg);
                } else if (data.success) {
                    uploadStatusLabel.textContent = 'Prêt à être envoyé avec votre message.';
                    uploadStatusLabel.style.color = 'green';
                    currentFileName = data.filename; // Store filename indicating success
                    // Optionally add a message to chat confirming upload?
                    // addMessage(`Fichier "${sanitizeHTML(data.filename)}" prêt.`, 'system'); // Example system message
                } else {
                     uploadStatusLabel.textContent = 'Réponse serveur inattendue.';
                     uploadStatusLabel.style.color = 'red';
                     currentFileName = null;
                }

            } catch (error) {
                hideLoading();
                console.error('Erreur lors de l\'upload:', error);
                uploadStatusLabel.textContent = `Erreur: ${sanitizeHTML(error.message)}`;
                uploadStatusLabel.style.color = 'red';
                fileNameLabel.textContent = 'Cliquez ou déposez un fichier ici (Max 100Mo)'; // Reset label
                fileUpload.value = ''; // Clear the file input
                currentFileName = null;
            }
        }

        async function clearChat() {
             if (!confirm("Êtes-vous sûr de vouloir effacer toute la conversation et les fichiers uploadés ?")) {
                 return;
            }
            showLoading("Effacement...");
            try {
                const response = await fetch('/clear_chat', { method: 'POST' });
                hideLoading();
                if (!response.ok) {
                     throw new Error(`Erreur serveur: ${response.status}`);
                }
                const data = await response.json();
                if (data.success) {
                    chatMessages.innerHTML = ''; // Clear messages on frontend
                    resetFileUploadUI();
                    messageInput.value = ''; // Clear input field
                     messageInput.style.height = '48px'; // Reset textarea height
                    console.log("Chat cleared successfully.");
                     // Optionally add a confirmation message
                     // addMessage("Conversation effacée.", "system");
                } else {
                    throw new Error("Le serveur n'a pas confirmé l'effacement.");
                }
            } catch (error) {
                hideLoading();
                console.error('Erreur lors de l\'effacement:', error);
                // Maybe display error in a non-chat way (e.g., alert or status bar)
                alert(`Erreur lors de l'effacement : ${error.message}`);
            }
        }

        function resetFileUploadUI() {
             fileNameLabel.textContent = 'Cliquez ou déposez un fichier ici (Max 100Mo)';
             uploadStatusLabel.textContent = '';
             fileUpload.value = ''; // Clear the actual file input
             currentFileName = null;
        }

        // --- Initial Setup ---
        // Scroll to bottom on initial load (after server-rendered messages)
        window.addEventListener('load', () => {
            chatMessages.scrollTop = chatMessages.scrollHeight;
             // Initial resize check for text area in case of cached content
            messageInput.style.height = 'auto';
            messageInput.style.height = (messageInput.scrollHeight) + 'px';
            messageInput.focus(); // Focus input on load

             // Initial rendering of messages from server uses Jinja template.
             // We need to apply marked AFTER the page loads to the server-rendered content.
             document.querySelectorAll('.message-bubble').forEach(bubble => {
                 // Re-parse content that came from the server template if it wasn't pre-rendered as HTML
                 // This assumes the server sent raw markdown in message.content
                 // If the server sends pre-rendered HTML via `| safe`, this step might not be needed
                 // or could cause double-rendering issues. Adjust based on backend output.

                 // Let's assume backend sends raw markdown for consistency with JS added messages:
                 if (typeof marked !== 'undefined') {
                      const currentContent = bubble.innerHTML; // Get the raw content from template
                      bubble.innerHTML = marked.parse(currentContent); // Parse and replace
                 }
             });
        });

         // Optional: Add online/offline status indicators
         window.addEventListener('offline', () => addMessage('⚠️ Vous êtes hors ligne. Vérifiez votre connexion.', 'system'));
         window.addEventListener('online', () => addMessage('✅ Vous êtes de nouveau en ligne.', 'system'));

    </script>

</body>
</html>