Merge pull request 'Improvements to quiz and dashboards.' (#9 ) from next into master

Reviewed-on: #9
Merge pull request 'Fix chatbot history not persistent; Fix uploaded notes disappearing; Fix Quiz Generation breaking' (#8 ) from next into master
2025-07-08 15:16:12 +00:00 · 2025-07-07 15:18:55 +00:00
14 changed files with 232 additions and 2371 deletions
--- a/README.md
+++ b/README.md
@@ -1,50 +1,5 @@
 # EduCat - AI-Powered Note Revision Platform

-EduCat is a modern web application that helps students improve their study notes using AI. Built with Node.js, Express, and EJS, it features secure file upload capabilities, AI-powered note revision, interactive quizzes, and an intelligent chatbot.
-
-## Features
-
-### 🔐 **Security & Authentication**
- Secure login and registration system
- Session-based authentication with flash messages
- Password hashing with bcrypt
- Strict file type whitelisting for secure uploads
-
-### 📁 **Document Processing**
- Upload notes in multiple formats (PDF, DOC, DOCX, XLSX, XLS, TXT, MD, JSON, CSV, XML)
- Secure document extraction with proper error handling
- File preview with extraction information and metadata
- Separate storage for original uploads and AI-revised notes
-
-### 🤖 **AI-Powered Features**
- **Note Revision**: Automatically improve, summarize, and generate study questions
- **Interactive Chatbot**: Chat with AI for study assistance
- **Quiz Generation**: Create interactive quizzes from uploaded documents
- **Smart Content Extraction**: Extract text from various document formats
-
-### 📊 **Dashboard & Management**
- Modern dashboard to manage uploaded files
- Separate sections for original files and AI-revised notes
- File preview with extraction status and metadata
- Download and delete functionality for all file types
-
-### 🎯 **Quiz System**
- Generate quizzes from uploaded documents
- Multiple question types (multiple choice, true/false, short answer)
- Comprehensive quiz review with explanations
- Statistics tracking for quiz performance
-
-### 🎨 **Modern UI/UX**
- Beautiful, responsive design with Bootstrap 5
- Custom SVG favicon and branded interface
- Improved file icons and visual indicators
- Mobile-friendly responsive layout
-
-### 🔗 **AI Integration**
- Connected to Flowise at https://flowise.suika.cc/
- RAG (Retrieval-Augmented Generation) capabilities
- Secure API integration with proper error handling-Powered Note Revision Platform
-
 EduCat is a modern web application that helps students improve their study notes using AI. Built with Node.js, Express, and EJS, it features file upload capabilities, AI-powered note revision, and an interactive chatbot.

 ## Features
@@ -62,15 +17,10 @@ EduCat is a modern web application that helps students improve their study notes
 - **Backend**: Node.js, Express.js
 - **Frontend**: EJS templates, Bootstrap 5, Font Awesome
 - **Authentication**: bcrypt for password hashing, express-session
- **File Handling**: Multer for secure file uploads with type validation
- **Document Processing**: 
-  - PDFParse for PDF extraction
-  - Mammoth for Word document processing
-  - ExcelJS for secure Excel file handling (replaced vulnerable xlsx)
- **AI Integration**: Flowise API integration with RAG capabilities
+- **File Handling**: Multer for file uploads
+- **AI Integration**: Flowise API integration
 - **Session Management**: Express Session with flash messages
- **Security**: File type whitelisting, secure extraction methods
- **Styling**: Custom CSS with Bootstrap and custom SVG favicon
+- **Styling**: Custom CSS with Bootstrap

 ## Installation

@@ -85,17 +35,6 @@ EduCat is a modern web application that helps students improve their study notes
   npm install
   ```

-   **Key Dependencies:**
-   - `express` - Web framework
-   - `ejs` - Template engine
-   - `multer` - File upload handling
-   - `bcrypt` - Password hashing
-   - `express-session` - Session management
-   - `pdf-parse` - PDF text extraction
-   - `mammoth` - Word document processing
-   - `exceljs` - Secure Excel file handling
-   - `axios` - HTTP client for API calls
-
 3. **Configure environment variables**:
   - Copy `.env.example` to `.env` (if exists) or create a new `.env` file
   - Update the following variables:
@@ -136,12 +75,8 @@ EduCat is a modern web application that helps students improve their study notes
 ### Uploading Notes
 1. After logging in, click "Upload Notes" in the navigation
 2. Drag and drop your file or click to browse
-3. Select a supported file type:
-   - **Documents**: PDF, DOC, DOCX
-   - **Spreadsheets**: XLSX, XLS  
-   - **Text Files**: TXT, MD, JSON, CSV, XML
+3. Select a file (PDF, DOC, TXT, or image)
 4. Click "Upload & Process"
-5. View file preview with extraction information

 ### Revising Notes
 1. Go to your Dashboard to see uploaded files
@@ -151,19 +86,11 @@ EduCat is a modern web application that helps students improve their study notes
   - **Summarize**: Creates concise summaries
   - **Generate Questions**: Creates study questions
 4. Click "Revise with AI" to process
-5. Save and download revised notes from the "AI-Revised Notes" section
-
-### Quiz System
-1. Upload a document to generate quizzes from
-2. Navigate to the quiz section
-3. Take interactive quizzes with multiple question types
-4. Review answers with detailed explanations
-5. Track your quiz performance and statistics

 ### Using the Chatbot
 1. Navigate to the "Chat" section
 2. Type your questions about study materials or academic topics
-3. Get instant AI-powered responses using RAG technology
+3. Get instant AI-powered responses

 ## Project Structure

@@ -174,10 +101,8 @@ EduCat/
 │   │   └── style.css
 │   ├── js/
 │   │   └── main.js
-│   ├── images/
-│   │   └── favicon.svg
-│   ├── favicon.svg
-│   └── favicon-32x32.svg
+│   └── images/
+│       └── logo.png
 ├── views/
 │   ├── partials/
 │   │   ├── header.ejs
@@ -187,14 +112,8 @@ EduCat/
 │   ├── revise.ejs
 │   ├── chat.ejs
 │   ├── dashboard.ejs
-│   ├── quiz.ejs
 │   └── error.ejs
 ├── uploads/
-│   └── revised-notes/
-├── data/
-│   ├── user-files/
-│   ├── revised-files/
-│   └── quiz-results/
 ├── server.js
 ├── package.json
 └── .env
@@ -202,38 +121,14 @@ EduCat/

 ## API Endpoints

-### Authentication & Core Routes
 - `GET /` - Home page
- `GET /login` - Login page
- `POST /login` - Handle login
- `GET /register` - Registration page
- `POST /register` - Handle registration
- `GET /logout` - Logout user
-
-### File Management
 - `GET /upload` - File upload page
- `POST /upload` - Handle file uploads with validation
- `GET /dashboard` - User dashboard with file management
- `GET /api/files/:fileId/preview` - File preview with extraction info
- `DELETE /api/files/:fileId` - Delete uploaded file
-
-### AI-Powered Features
+- `POST /upload` - Handle file uploads
 - `GET /revise/:fileId` - Note revision page
 - `POST /api/revise` - AI revision endpoint
- `POST /api/save-revised` - Save revised notes
- `GET /api/download-revised/:fileId` - Download revised notes
- `GET /api/revised-files/:fileId/info` - Get revised file info
- `DELETE /api/revised-files/:fileId` - Delete revised file
-
-### Quiz System
- `GET /quiz` - Quiz interface
- `POST /api/quiz/generate` - Generate quiz from document
- `POST /api/quiz/submit` - Submit quiz answers
- `GET /api/quiz/results` - Get quiz statistics
-
-### Chat Integration
 - `GET /chat` - Chat interface
- `POST /api/chat` - Chat API endpoint with RAG support
+- `POST /api/chat` - Chat API endpoint
+- `GET /dashboard` - User dashboard

 ## Configuration

@@ -249,37 +144,24 @@ EduCat/
 ### File Upload Settings

 - **Maximum file size**: 10MB
- **Allowed formats**: PDF, DOC, DOCX, XLSX, XLS, TXT, MD, JSON, CSV, XML
- **Upload directory**: `uploads/` (original files)
- **Revised notes directory**: `uploads/revised-notes/`
- **Security**: Strict file type whitelisting with MIME type validation
- **Processing**: Automatic text extraction with error handling
+- **Allowed formats**: PDF, DOC, DOCX, TXT, JPG, JPEG, PNG, GIF
+- **Upload directory**: `uploads/`

 ## Customization

 ### Styling
 - Edit `public/css/style.css` to customize the appearance
 - The design uses Bootstrap 5 with custom CSS variables
- Custom SVG favicon and file icons for better visual consistency
- Responsive design optimized for mobile and desktop

 ### AI Integration
 - Modify the Flowise API calls in `server.js`
 - Update prompts in the `/api/revise` endpoint
 - Customize chat responses in the `/api/chat` endpoint
- Configure RAG settings for document-based queries
-
-### Security
- File type restrictions configured in server.js and main.js
- MIME type validation for uploaded files
- Secure document extraction methods
- Session security with proper secret management

 ### Adding Features
 - Add new routes in `server.js`
 - Create corresponding EJS templates in `views/`
 - Add client-side JavaScript in `public/js/main.js`
- Update CSS in `public/css/style.css`

 ## Troubleshooting

@@ -287,38 +169,17 @@ EduCat/

 1. **File upload fails**:
   - Check file size (max 10MB)
-   - Verify file format is supported (PDF, DOC, DOCX, XLSX, XLS, TXT, MD, JSON, CSV, XML)
-   - Ensure `uploads/` and `uploads/revised-notes/` directories exist
-   - Check file type validation in both client and server
+   - Verify file format is supported
+   - Ensure `uploads/` directory exists

-2. **Document extraction errors**:
-   - Verify document is not corrupted
-   - Check extraction status in file preview
-   - Ensure proper permissions for file access
-   - Review server logs for specific extraction errors
-
-3. **AI responses don't work**:
+2. **AI responses don't work**:
   - Verify Flowise API URL is correct
   - Check if your chatflow ID is valid
   - Ensure Flowise server is accessible
-   - Verify RAG configuration for document-based queries

-4. **Quiz generation fails**:
-   - Ensure document has sufficient text content
-   - Check if document extraction was successful
-   - Verify AI service is properly connected
-   - Review quiz generation prompts
-
-5. **Session issues**:
-   - Verify SESSION_SECRET is set in .env
+3. **Session issues**:
+   - Verify SESSION_SECRET is set
   - Check if sessions are properly configured
-   - Clear browser cookies and try again
-
-6. **Revised notes not saving**:
-   - Ensure `uploads/revised-notes/` directory exists
-   - Check file permissions
-   - Verify sufficient disk space
-   - Review server logs for save errors

 ### Development

@@ -328,58 +189,6 @@ npm install -g nodemon
 npm run dev
 ```

-## Recent Updates & Security Improvements
-
-### Version 2.0 Security Enhancements
- **🔒 Enhanced Security**: Replaced vulnerable `xlsx` library with secure `exceljs` for Excel processing
- **🛡️ File Type Whitelisting**: Implemented strict file type validation to prevent malicious uploads
- **🔍 MIME Type Validation**: Added comprehensive file type checking on both client and server
- **🗂️ Secure Document Processing**: Improved extraction methods with proper error handling
-
-### UI/UX Improvements
- **🎨 Custom Favicon**: Added custom SVG favicon for brand consistency
- **📱 Responsive Design**: Enhanced mobile-friendly interface with improved layouts
- **🔧 File Icons**: Updated file type icons for better visual clarity
- **📊 Dashboard Enhancements**: Separate sections for original and revised files
- **🏷️ Badge System**: Improved status indicators and badge alignment
-
-### New Features
- **💾 Revised Notes Management**: Save, download, and manage AI-revised notes separately
- **🎯 Enhanced Quiz System**: Fixed short-answer questions with explanations
- **📈 Quiz Statistics**: Comprehensive tracking of quiz performance
- **🔍 File Preview**: Detailed extraction information and metadata display
- **📁 Persistent Storage**: Improved file tracking and session management
-
-### Performance & Reliability
- **⚡ Optimized Extraction**: Faster and more reliable document processing
- **🔄 Error Handling**: Comprehensive error handling for all file operations
- **💪 Robust API**: Improved API endpoints with better validation
- **🧹 Code Refactoring**: Cleaner, more maintainable codebase
-
-## Deployment & Production
-
-### Production Considerations
- Set strong `SESSION_SECRET` in production environment
- Configure proper file upload limits based on server capacity
- Set up proper logging and monitoring
- Implement rate limiting for API endpoints
- Configure HTTPS for secure file uploads
- Set up backup procedures for uploaded files and data
-
-### Environment Setup
- Ensure Node.js 14+ is installed
- Create proper directory structure with correct permissions
- Configure environment variables for production
- Set up reverse proxy (nginx/Apache) if needed
- Configure SSL certificates for HTTPS
-
-### Monitoring & Maintenance
- Monitor disk space for uploads directory
- Set up log rotation for application logs
- Regular security updates for dependencies
- Monitor API usage and performance
- Backup user data and quiz results regularly
-
 ## Contributing

 1. Fork the repository
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,6 @@
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      "version": "5.0.0",
      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
@@ -3695,36 +3150,6 @@
      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
      "license": "ISC"
    },
-    "node_modules/ws": {
-      "version": "8.18.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
-      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=10.0.0"
-      },
-      "peerDependencies": {
-        "bufferutil": "^4.0.1",
-        "utf-8-validate": ">=5.0.2"
-      },
-      "peerDependenciesMeta": {
-        "bufferutil": {
-          "optional": true
-        },
-        "utf-8-validate": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/xml-name-validator": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
-      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
-      "license": "Apache-2.0",
-      "engines": {
-        "node": ">=18"
-      }
-    },
    "node_modules/xmlbuilder": {
      "version": "10.1.1",
      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-10.1.1.tgz",
--- a/package.json
+++ b/package.json
@@ -13,7 +13,6 @@
    "body-parser": "^1.20.2",
    "connect-flash": "^0.1.1",
    "cors": "^2.8.5",
-    "dompurify": "^3.2.6",
    "dotenv": "^16.4.5",
    "ejs": "^3.1.10",
    "exceljs": "^4.4.0",
@@ -21,9 +20,7 @@
    "express-session": "^1.18.0",
    "form-data": "^4.0.3",
    "fs-extra": "^11.2.0",
-    "jsdom": "^26.1.0",
    "mammoth": "^1.9.1",
-    "marked": "^16.0.0",
    "multer": "^2.0.0",
    "pdf-parse": "^1.1.1",
    "uuid": "^10.0.0"
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -614,357 +614,3 @@ body {
    border-radius: 0.75rem;
    overflow: hidden;
 }
-
-/* Enhanced Chat Message Formatting */
-.message-text {
-    line-height: 1.6;
-    word-wrap: break-word;
-    overflow-wrap: break-word;
-}
-
-.message-text h3,
-.message-text h4,
-.message-text h5 {
-    color: inherit;
-    font-weight: 600;
-    margin-bottom: 0.5rem;
-}
-
-.message-text h3 {
-    font-size: 1.1rem;
-    border-bottom: 1px solid rgba(0,0,0,0.1);
-    padding-bottom: 0.25rem;
-}
-
-.message-text h4 {
-    font-size: 1.05rem;
-}
-
-.message-text h5 {
-    font-size: 1rem;
-}
-
-/* Code formatting */
-.message-text .code-block {
-    background-color: #f8f9fa;
-    border: 1px solid #e9ecef;
-    border-radius: 0.375rem;
-    padding: 0.75rem;
-    margin: 0.5rem 0;
-    font-family: 'Courier New', monospace;
-    font-size: 0.875rem;
-    white-space: pre-wrap;
-    overflow-x: auto;
-    max-width: 100%;
-}
-
-.message-text .inline-code {
-    background-color: #f8f9fa;
-    border: 1px solid #e9ecef;
-    border-radius: 0.25rem;
-    padding: 0.125rem 0.25rem;
-    font-family: 'Courier New', monospace;
-    font-size: 0.875rem;
-    color: #d63384;
-}
-
-/* List formatting */
-.message-text .formatted-list {
-    margin: 0.5rem 0;
-    padding-left: 1.5rem;
-}
-
-.message-text .formatted-list li {
-    margin-bottom: 0.25rem;
-    line-height: 1.5;
-}
-
-.message-text ul.formatted-list {
-    list-style-type: disc;
-}
-
-.message-text ol.formatted-list {
-    list-style-type: decimal;
-}
-
-.message-text .bullet-item,
-.message-text .list-item {
-    display: list-item;
-}
-
-/* Bold and italic text */
-.message-text strong {
-    font-weight: 600;
-}
-
-.message-text em {
-    font-style: italic;
-}
-
-/* Paragraph spacing */
-.message-text br + br {
-    display: block;
-    margin: 0.5rem 0;
-    content: "";
-}
-
-/* Special styling for bot messages */
-.bot-message .message-text .code-block {
-    background-color: #f1f3f4;
-    border-color: #dadce0;
-}
-
-.bot-message .message-text .inline-code {
-    background-color: #f1f3f4;
-    border-color: #dadce0;
-    color: #1a73e8;
-}
-
-/* Special styling for user messages */
-.user-message .message-text .code-block {
-    background-color: rgba(255,255,255,0.1);
-    border-color: rgba(255,255,255,0.2);
-    color: #ffffff;
-}
-
-.user-message .message-text .inline-code {
-    background-color: rgba(255,255,255,0.1);
-    border-color: rgba(255,255,255,0.2);
-    color: #ffffff;
-}
-
-.user-message .message-text h3,
-.user-message .message-text h4,
-.user-message .message-text h5 {
-    color: #ffffff;
-    border-color: rgba(255,255,255,0.3);
-}
-
-/* Rendered Markdown Styles */
-.rendered-markdown {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-    line-height: 1.6;
-    color: #333;
-    max-width: 100%;
-    word-wrap: break-word;
-}
-
-.rendered-markdown h1,
-.rendered-markdown h2,
-.rendered-markdown h3,
-.rendered-markdown h4,
-.rendered-markdown h5,
-.rendered-markdown h6 {
-    margin-top: 1.5rem;
-    margin-bottom: 0.75rem;
-    font-weight: 600;
-    line-height: 1.25;
-}
-
-.rendered-markdown h1 {
-    font-size: 1.75rem;
-    border-bottom: 2px solid #e1e4e8;
-    padding-bottom: 0.5rem;
-}
-
-.rendered-markdown h2 {
-    font-size: 1.5rem;
-    border-bottom: 1px solid #e1e4e8;
-    padding-bottom: 0.3rem;
-}
-
-.rendered-markdown h3 {
-    font-size: 1.25rem;
-}
-
-.rendered-markdown h4 {
-    font-size: 1.1rem;
-}
-
-.rendered-markdown h5,
-.rendered-markdown h6 {
-    font-size: 1rem;
-}
-
-.rendered-markdown p {
-    margin-bottom: 1rem;
-}
-
-.rendered-markdown strong,
-.rendered-markdown b {
-    font-weight: 600;
-}
-
-.rendered-markdown em,
-.rendered-markdown i {
-    font-style: italic;
-}
-
-.rendered-markdown ul,
-.rendered-markdown ol {
-    margin-bottom: 1rem;
-    padding-left: 2rem;
-}
-
-.rendered-markdown li {
-    margin-bottom: 0.25rem;
-}
-
-.rendered-markdown li > p {
-    margin-bottom: 0.5rem;
-}
-
-.rendered-markdown ul {
-    list-style-type: disc;
-}
-
-.rendered-markdown ol {
-    list-style-type: decimal;
-}
-
-.rendered-markdown blockquote {
-    margin: 1rem 0;
-    padding: 0.5rem 1rem;
-    border-left: 4px solid #dfe2e5;
-    background-color: #f6f8fa;
-    color: #6a737d;
-}
-
-.rendered-markdown blockquote p:last-child {
-    margin-bottom: 0;
-}
-
-.rendered-markdown pre {
-    background-color: #f6f8fa;
-    border-radius: 6px;
-    font-size: 0.875rem;
-    line-height: 1.45;
-    overflow: auto;
-    padding: 1rem;
-    margin-bottom: 1rem;
-    font-family: 'Courier New', Consolas, monospace;
-}
-
-.rendered-markdown code {
-    background-color: rgba(27, 31, 35, 0.05);
-    border-radius: 3px;
-    font-size: 0.875rem;
-    margin: 0;
-    padding: 0.2em 0.4em;
-    font-family: 'Courier New', Consolas, monospace;
-}
-
-.rendered-markdown pre code {
-    background-color: transparent;
-    border-radius: 0;
-    font-size: inherit;
-    margin: 0;
-    padding: 0;
-    word-break: normal;
-    white-space: pre;
-    word-wrap: normal;
-}
-
-.rendered-markdown table {
-    border-collapse: collapse;
-    margin-bottom: 1rem;
-    width: 100%;
-}
-
-.rendered-markdown table th,
-.rendered-markdown table td {
-    border: 1px solid #dfe2e5;
-    padding: 6px 13px;
-    text-align: left;
-}
-
-.rendered-markdown table th {
-    background-color: #f6f8fa;
-    font-weight: 600;
-}
-
-.rendered-markdown table tr:nth-child(2n) {
-    background-color: #f6f8fa;
-}
-
-.rendered-markdown a {
-    color: #0366d6;
-    text-decoration: none;
-}
-
-.rendered-markdown a:hover {
-    text-decoration: underline;
-}
-
-.rendered-markdown hr {
-    border: none;
-    border-top: 1px solid #e1e4e8;
-    height: 1px;
-    margin: 1.5rem 0;
-}
-
-.rendered-markdown img {
-    max-width: 100%;
-    height: auto;
-    border-radius: 6px;
-    margin: 0.5rem 0;
-}
-
-/* Display mode toggle styling */
-#display-mode-toggle .btn-outline-secondary {
-    border-color: #6c757d;
-    color: #6c757d;
-    padding: 0.25rem 0.5rem;
-    font-size: 0.875rem;
-}
-
-#display-mode-toggle .btn-check:checked + .btn-outline-secondary {
-    background-color: #6c757d;
-    border-color: #6c757d;
-    color: white;
-}
-
-#display-mode-toggle .btn-outline-secondary:hover {
-    background-color: #5c636a;
-    border-color: #565e64;
-    color: white;
-}
-
-/* Alert for format detection */
-.alert-sm {
-    padding: 0.375rem 0.75rem;
-    font-size: 0.875rem;
-}
-
-/* Responsive adjustments */
-@media (max-width: 768px) {
-    .rendered-markdown {
-        font-size: 0.9rem;
-    }
-    
-    .rendered-markdown h1 {
-        font-size: 1.5rem;
-    }
-    
-    .rendered-markdown h2 {
-        font-size: 1.3rem;
-    }
-    
-    .rendered-markdown h3 {
-        font-size: 1.1rem;
-    }
-    
-    .rendered-markdown pre {
-        padding: 0.75rem;
-        font-size: 0.8rem;
-    }
-    
-    .rendered-markdown table {
-        font-size: 0.875rem;
-    }
-    
-    .rendered-markdown ul,
-    .rendered-markdown ol {
-        padding-left: 1.5rem;
-    }
-}
--- a/public/favicon-32x32.svg
+++ b/public/favicon-32x32.svg
@@ -1,38 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
-  <defs>
-    <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
-      <stop offset="0%" style="stop-color:#007bff;stop-opacity:1" />
-      <stop offset="100%" style="stop-color:#0056b3;stop-opacity:1" />
-    </linearGradient>
-  </defs>
-  
-  <!-- Background circle -->
-  <circle cx="16" cy="16" r="15" fill="url(#grad1)" stroke="#ffffff" stroke-width="1"/>
-  
-  <!-- Cat ears -->
-  <polygon points="8,8 12,4 16,8" fill="#ffffff" opacity="0.9"/>
-  <polygon points="16,8 20,4 24,8" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Cat face -->
-  <ellipse cx="16" cy="18" rx="8" ry="6" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Eyes -->
-  <circle cx="13" cy="16" r="1.5" fill="#007bff"/>
-  <circle cx="19" cy="16" r="1.5" fill="#007bff"/>
-  
-  <!-- Nose -->
-  <polygon points="16,18 15,19 17,19" fill="#007bff"/>
-  
-  <!-- Mouth -->
-  <path d="M 16 19 Q 14 21 12 20" stroke="#007bff" stroke-width="1" fill="none" stroke-linecap="round"/>
-  <path d="M 16 19 Q 18 21 20 20" stroke="#007bff" stroke-width="1" fill="none" stroke-linecap="round"/>
-  
-  <!-- Whiskers -->
-  <line x1="8" y1="17" x2="11" y2="17" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="8" y1="19" x2="11" y2="19" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="21" y1="17" x2="24" y2="17" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="21" y1="19" x2="24" y2="19" stroke="#007bff" stroke-width="0.5"/>
-  
-  <!-- Small AI indicator -->
-  <text x="16" y="26" text-anchor="middle" font-family="Arial, sans-serif" font-size="6" font-weight="bold" fill="#ffffff">AI</text>
-</svg>
--- a/public/favicon.svg
+++ b/public/favicon.svg
@@ -1,32 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
-  <defs>
-    <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
-      <stop offset="0%" style="stop-color:#007bff;stop-opacity:1" />
-      <stop offset="100%" style="stop-color:#0056b3;stop-opacity:1" />
-    </linearGradient>
-  </defs>
-  
-  <!-- Background circle -->
-  <circle cx="8" cy="8" r="7.5" fill="url(#grad1)" stroke="#ffffff" stroke-width="0.5"/>
-  
-  <!-- Cat ears -->
-  <polygon points="4,4 6,2 8,4" fill="#ffffff" opacity="0.9"/>
-  <polygon points="8,4 10,2 12,4" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Cat face -->
-  <ellipse cx="8" cy="9" rx="4" ry="3" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Eyes -->
-  <circle cx="6.5" cy="8" r="0.7" fill="#007bff"/>
-  <circle cx="9.5" cy="8" r="0.7" fill="#007bff"/>
-  
-  <!-- Nose -->
-  <polygon points="8,9 7.5,9.5 8.5,9.5" fill="#007bff"/>
-  
-  <!-- Mouth -->
-  <path d="M 8 9.5 Q 7 10.5 6 10" stroke="#007bff" stroke-width="0.5" fill="none" stroke-linecap="round"/>
-  <path d="M 8 9.5 Q 9 10.5 10 10" stroke="#007bff" stroke-width="0.5" fill="none" stroke-linecap="round"/>
-  
-  <!-- Small AI indicator -->
-  <text x="8" y="13" text-anchor="middle" font-family="Arial, sans-serif" font-size="3" font-weight="bold" fill="#ffffff">AI</text>
-</svg>
--- a/public/images/favicon.svg
+++ b/public/images/favicon.svg
@@ -1,38 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
-  <defs>
-    <linearGradient id="grad1" x1="0%" y1="0%" x2="100%" y2="100%">
-      <stop offset="0%" style="stop-color:#007bff;stop-opacity:1" />
-      <stop offset="100%" style="stop-color:#0056b3;stop-opacity:1" />
-    </linearGradient>
-  </defs>
-  
-  <!-- Background circle -->
-  <circle cx="16" cy="16" r="15" fill="url(#grad1)" stroke="#ffffff" stroke-width="1"/>
-  
-  <!-- Cat ears -->
-  <polygon points="8,8 12,4 16,8" fill="#ffffff" opacity="0.9"/>
-  <polygon points="16,8 20,4 24,8" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Cat face -->
-  <ellipse cx="16" cy="18" rx="8" ry="6" fill="#ffffff" opacity="0.9"/>
-  
-  <!-- Eyes -->
-  <circle cx="13" cy="16" r="1.5" fill="#007bff"/>
-  <circle cx="19" cy="16" r="1.5" fill="#007bff"/>
-  
-  <!-- Nose -->
-  <polygon points="16,18 15,19 17,19" fill="#007bff"/>
-  
-  <!-- Mouth -->
-  <path d="M 16 19 Q 14 21 12 20" stroke="#007bff" stroke-width="1" fill="none" stroke-linecap="round"/>
-  <path d="M 16 19 Q 18 21 20 20" stroke="#007bff" stroke-width="1" fill="none" stroke-linecap="round"/>
-  
-  <!-- Whiskers -->
-  <line x1="8" y1="17" x2="11" y2="17" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="8" y1="19" x2="11" y2="19" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="21" y1="17" x2="24" y2="17" stroke="#007bff" stroke-width="0.5"/>
-  <line x1="21" y1="19" x2="24" y2="19" stroke="#007bff" stroke-width="0.5"/>
-  
-  <!-- Small AI indicator -->
-  <text x="16" y="26" text-anchor="middle" font-family="Arial, sans-serif" font-size="6" font-weight="bold" fill="#ffffff">AI</text>
-</svg>
--- a/public/js/main.js
+++ b/public/js/main.js
@@ -53,60 +53,9 @@ function initializeFileUpload() {

    function showFileInfo(file) {
        if (fileName && fileSize && fileInfo) {
-            // Define allowed file types for client-side validation
-            const allowedExtensions = ['.pdf', '.txt', '.doc', '.docx', '.xlsx', '.xls', '.md', '.json', '.csv', '.xml'];
-            const allowedMimeTypes = [
-                'application/pdf',
-                'text/plain',
-                'text/markdown',
-                'text/csv',
-                'text/xml',
-                'application/xml',
-                'application/json',
-                'application/msword',
-                'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
-                'application/vnd.ms-excel',
-                'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
-            ];
-            
-            // Get file extension
-            const fileExtension = '.' + file.name.split('.').pop().toLowerCase();
-            const fileMimeType = file.type.toLowerCase();
-            
-            // Check if file type is allowed
-            const isExtensionAllowed = allowedExtensions.includes(fileExtension);
-            const isMimeTypeAllowed = allowedMimeTypes.includes(fileMimeType) || fileMimeType === '';
-            
-            if (!isExtensionAllowed) {
-                // Show error for invalid file type
-                fileInfo.innerHTML = `
-                    <div class="alert alert-danger">
-                        <i class="fas fa-exclamation-triangle me-2"></i>
-                        <strong>Invalid file type!</strong> "${fileExtension}" files are not supported.
-                        <br><small>Only document files (PDF, Word, Excel, text files) are allowed to prevent RAG corruption.</small>
-                    </div>
-                `;
-                fileInfo.classList.remove('d-none');
-                uploadBtn.disabled = true;
-                return;
-            }
-            
-            // Show valid file info
-            fileInfo.innerHTML = `
-                <div class="alert alert-info">
-                    <i class="fas fa-file me-2"></i>
-                    <span>${file.name}</span>
-                    <span class="text-muted ms-2">(${formatFileSize(file.size)})</span>
-                    <div class="mt-2">
-                        <small class="text-success">
-                            <i class="fas fa-check-circle me-1"></i>
-                            File type supported for AI processing
-                        </small>
-                    </div>
-                </div>
-            `;
+            fileName.textContent = file.name;
+            fileSize.textContent = `(${formatFileSize(file.size)})`;
            fileInfo.classList.remove('d-none');
-            uploadBtn.disabled = false;
        }
    }

--- a/server.js
+++ b/server.js
--- a/views/chat.ejs
+++ b/views/chat.ejs
@@ -94,16 +94,6 @@ document.addEventListener('DOMContentLoaded', function() {
    function addWelcomeMessage() {
        const messageDiv = document.createElement('div');
        messageDiv.className = 'chat-message bot-message mb-3';
-        const welcomeText = `Hello! I'm **EduCat AI**, your study assistant. I can help you with:
-
-• Questions about your notes and study materials
-• Study techniques and academic strategies
-• Explanations of complex concepts
-• Creating study plans and schedules
-
-How can I assist you today?`;
-        const formattedWelcome = formatMessage(welcomeText, true);
-        
        messageDiv.innerHTML = `
            <div class="d-flex align-items-start">
                <div class="avatar bg-primary text-white rounded-circle d-flex align-items-center justify-content-center me-3 flex-shrink-0" style="width: 45px; height: 45px; min-width: 45px;">
@@ -111,7 +101,7 @@ How can I assist you today?`;
                </div>
                <div class="message-content flex-grow-1">
                    <div class="message-bubble bg-light p-3 rounded-3 shadow-sm border">
-                        <div class="message-text">${formattedWelcome}</div>
+                        <p class="mb-0">Hello! I'm EduCat AI, your study assistant. I can help you with questions about your notes, study techniques, and academic topics. How can I assist you today?</p>
                    </div>
                    <small class="text-muted d-block mt-1">Just now</small>
                </div>
@@ -135,81 +125,18 @@ How can I assist you today?`;
        sendToAI(message);
    }
    
-    function formatMessage(text, isBot = false) {
-        if (!isBot) {
-            // For user messages, just escape HTML and preserve basic formatting
-            return text.replace(/&/g, '&amp;')
-                      .replace(/</g, '&lt;')
-                      .replace(/>/g, '&gt;')
-                      .replace(/\n/g, '<br>');
-        }
-        
-        // For bot messages, apply rich formatting
-        let formatted = text
-            // Escape HTML first
-            .replace(/&/g, '&amp;')
-            .replace(/</g, '&lt;')
-            .replace(/>/g, '&gt;');
-        
-        // Convert markdown-style formatting
-        // Bold text **text** or __text__
-        formatted = formatted.replace(/\*\*(.*?)\*\*/g, '<strong>$1</strong>');
-        formatted = formatted.replace(/__(.*?)__/g, '<strong>$1</strong>');
-        
-        // Italic text *text* or _text_
-        formatted = formatted.replace(/(?<!\*)\*([^*]+)\*(?!\*)/g, '<em>$1</em>');
-        formatted = formatted.replace(/(?<!_)_([^_]+)_(?!_)/g, '<em>$1</em>');
-        
-        // Code blocks ```code```
-        formatted = formatted.replace(/```([\s\S]*?)```/g, '<pre class="code-block"><code>$1</code></pre>');
-        
-        // Inline code `code`
-        formatted = formatted.replace(/`([^`]+)`/g, '<code class="inline-code">$1</code>');
-        
-        // Headers
-        formatted = formatted.replace(/^### (.*$)/gm, '<h5 class="mt-3 mb-2">$1</h5>');
-        formatted = formatted.replace(/^## (.*$)/gm, '<h4 class="mt-3 mb-2">$1</h4>');
-        formatted = formatted.replace(/^# (.*$)/gm, '<h3 class="mt-3 mb-2">$1</h3>');
-        
-        // Convert bullet points and numbered lists
-        // Handle bullet points: - item, * item, • item
-        formatted = formatted.replace(/^[\s]*[-*•]\s+(.+)$/gm, '<li class="bullet-item">$1</li>');
-        
-        // Handle numbered lists: 1. item, 2. item, etc.
-        formatted = formatted.replace(/^[\s]*\d+\.\s+(.+)$/gm, '<li class="numbered-item">$1</li>');
-        
-        // Wrap consecutive list items in proper list containers
-        formatted = formatted.replace(/(<li class="bullet-item">.*?<\/li>)(?:\s*<li class="bullet-item">.*?<\/li>)*/gs, function(match) {
-            return '<ul class="formatted-list">' + match + '</ul>';
-        });
-        
-        formatted = formatted.replace(/(<li class="numbered-item">.*?<\/li>)(?:\s*<li class="numbered-item">.*?<\/li>)*/gs, function(match) {
-            return '<ol class="formatted-list">' + match.replace(/class="numbered-item"/g, 'class="list-item"') + '</ol>';
-        });
-        
-        // Convert line breaks to <br> but not inside <pre> or list tags
-        let parts = formatted.split(/(<pre[\s\S]*?<\/pre>|<ul[\s\S]*?<\/ul>|<ol[\s\S]*?<\/ol>)/);
-        for (let i = 0; i < parts.length; i += 2) {
-            parts[i] = parts[i].replace(/\n\s*\n/g, '<br><br>').replace(/\n/g, '<br>');
-        }
-        formatted = parts.join('');
-        
-        return formatted;
-    }
-
    function addMessageToChat(sender, message, withScroll = true) {
        const messageDiv = document.createElement('div');
        messageDiv.className = `chat-message ${sender}-message mb-3`;
        
        const time = new Date().toLocaleTimeString([], {hour: '2-digit', minute:'2-digit'});
-        const formattedMessage = formatMessage(message, sender === 'bot');
        
        if (sender === 'user') {
            messageDiv.innerHTML = `
                <div class="d-flex align-items-start justify-content-end">
                    <div class="message-content me-3 flex-grow-1" style="max-width: 70%;">
                        <div class="message-bubble bg-primary text-white p-3 rounded-3 shadow-sm">
-                            <div class="message-text">${formattedMessage}</div>
+                            <p class="mb-0">${message}</p>
                        </div>
                        <small class="text-muted d-block text-end mt-1">${time}</small>
                    </div>
@@ -226,7 +153,7 @@ How can I assist you today?`;
                    </div>
                    <div class="message-content flex-grow-1" style="max-width: 70%;">
                        <div class="message-bubble bg-light p-3 rounded-3 shadow-sm border">
-                            <div class="message-text">${formattedMessage}</div>
+                            <p class="mb-0">${message}</p>
                        </div>
                        <small class="text-muted d-block mt-1">${time}</small>
                    </div>
--- a/views/dashboard.ejs
+++ b/views/dashboard.ejs
@@ -890,100 +890,25 @@ async function previewRevisedFile(fileId) {
        
        const file = fileInfo.file;
        
-        // Get file content using the new API endpoint
-        const contentResponse = await fetch(`/api/revised-files/${fileId}/content`);
+        // Download the file content
+        const contentResponse = await fetch(`/uploads/revised-notes/${file.filename}`);
        if (!contentResponse.ok) {
            throw new Error('Failed to load file content');
        }
        
-        const contentResult = await contentResponse.json();
-        if (!contentResult.success) {
-            throw new Error('Failed to load file content');
-        }
-        
-        const content = contentResult.content;
+        const content = await contentResponse.text();
        const modal = new bootstrap.Modal(document.getElementById('previewModal'));
        
-        // Create preview content with display mode toggle
        document.getElementById('preview-content').innerHTML = `
-            <div class="d-flex justify-content-between align-items-center mb-3">
-                <div class="alert alert-info mb-0 flex-grow-1 me-3">
-                    <i class="fas fa-brain me-2"></i>
-                    <strong>AI-Revised Content</strong> • ${file.revisionType} • From: ${file.originalFileName || 'Unknown'}
-                </div>
-                <div class="btn-group btn-group-sm" role="group" id="preview-display-mode">
-                    <input type="radio" class="btn-check" name="previewDisplayMode" id="preview-mode-markdown" value="markdown" checked>
-                    <label class="btn btn-outline-secondary" for="preview-mode-markdown" title="Show as Markdown">
-                        <i class="fab fa-markdown"></i>
-                    </label>
-                    
-                    <input type="radio" class="btn-check" name="previewDisplayMode" id="preview-mode-html" value="html">
-                    <label class="btn btn-outline-secondary" for="preview-mode-html" title="Render as HTML">
-                        <i class="fas fa-code"></i>
-                    </label>
-                </div>
+            <div class="alert alert-info">
+                <i class="fas fa-brain me-2"></i>
+                <strong>AI-Revised Content</strong> • ${file.revisionType} • From: ${file.originalFileName || 'Unknown'}
            </div>
-            <div id="preview-content-container" class="border p-3 bg-light rounded" style="max-height: 400px; overflow-y: auto;">
-                <pre style="white-space: pre-wrap; word-wrap: break-word; margin: 0;">${escapeHtml(content)}</pre>
+            <div class="border p-3 bg-light rounded" style="max-height: 400px; overflow-y: auto;">
+                <pre style="white-space: pre-wrap; word-wrap: break-word;">${escapeHtml(content)}</pre>
            </div>
        `;
        
-        // Add event listeners for display mode toggle
-        const modeMarkdown = document.getElementById('preview-mode-markdown');
-        const modeHtml = document.getElementById('preview-mode-html');
-        const contentContainer = document.getElementById('preview-content-container');
-        
-        async function updatePreviewMode() {
-            const selectedMode = document.querySelector('input[name="previewDisplayMode"]:checked').value;
-            
-            try {
-                const renderResponse = await fetch('/api/render-revised-content', {
-                    method: 'POST',
-                    headers: {
-                        'Content-Type': 'application/json',
-                    },
-                    body: JSON.stringify({
-                        content: content,
-                        displayMode: selectedMode,
-                        autoDetect: true
-                    })
-                });
-                
-                const renderResult = await renderResponse.json();
-                
-                if (renderResult.success) {
-                    if (selectedMode === 'html') {
-                        let htmlContent = `<div class="rendered-markdown">${renderResult.renderedContent}</div>`;
-                        
-                        if (renderResult.isMarkdownContent) {
-                            htmlContent = `
-                                <div class="alert alert-info alert-sm mb-2">
-                                    <small><i class="fas fa-info-circle me-1"></i>Markdown formatting detected and rendered</small>
-                                </div>
-                                ${htmlContent}
-                            `;
-                        }
-                        
-                        contentContainer.innerHTML = htmlContent;
-                        contentContainer.style.backgroundColor = '#ffffff';
-                    } else {
-                        contentContainer.innerHTML = `<pre style="white-space: pre-wrap; word-wrap: break-word; margin: 0;">${escapeHtml(renderResult.renderedContent)}</pre>`;
-                        contentContainer.style.backgroundColor = '#f8f9fa';
-                    }
-                } else {
-                    throw new Error(renderResult.error || 'Failed to render content');
-                }
-            } catch (error) {
-                console.error('Error rendering preview:', error);
-                // Fallback to escaped text
-                contentContainer.innerHTML = `<pre style="white-space: pre-wrap; word-wrap: break-word; margin: 0;">${escapeHtml(content)}</pre>`;
-                contentContainer.style.backgroundColor = '#f8f9fa';
-            }
-        }
-        
-        modeMarkdown.addEventListener('change', updatePreviewMode);
-        modeHtml.addEventListener('change', updatePreviewMode);
-        
        modal.show();
    } catch (error) {
        console.error('Error previewing revised file:', error);
--- a/views/partials/header.ejs
+++ b/views/partials/header.ejs
@@ -4,13 +4,6 @@
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><%= title %></title>
-    
-    <!-- Favicon -->
-    <link rel="icon" type="image/svg+xml" href="/favicon.svg">
-    <link rel="icon" type="image/svg+xml" sizes="32x32" href="/favicon-32x32.svg">
-    <link rel="apple-touch-icon" sizes="180x180" href="/images/favicon.svg">
-    <meta name="theme-color" content="#007bff">
-    
    <link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.3.0/css/bootstrap.min.css" rel="stylesheet">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
    <link href="/css/style.css" rel="stylesheet">
--- a/views/revise.ejs
+++ b/views/revise.ejs
@@ -35,20 +35,7 @@
                            </div>
                        </div>
                        <div class="col-md-6">
-                            <div class="d-flex justify-content-between align-items-center mb-2">
-                                <h5>AI-Revised Notes</h5>
-                                <div class="btn-group btn-group-sm" role="group" id="display-mode-toggle" style="display: none;">
-                                    <input type="radio" class="btn-check" name="displayMode" id="mode-markdown" value="markdown" checked>
-                                    <label class="btn btn-outline-secondary" for="mode-markdown" title="Show as Markdown">
-                                        <i class="fab fa-markdown"></i>
-                                    </label>
-                                    
-                                    <input type="radio" class="btn-check" name="displayMode" id="mode-html" value="html">
-                                    <label class="btn btn-outline-secondary" for="mode-html" title="Render as HTML">
-                                        <i class="fas fa-code"></i>
-                                    </label>
-                                </div>
-                            </div>
+                            <h5>AI-Revised Notes</h5>
                            <div id="revised-content" class="border p-3 bg-white rounded" style="height: 400px; overflow-y: auto;">
                                <p class="text-muted text-center mt-5">Select a revision type and click "Revise" to see AI-enhanced notes here.</p>
                            </div>
@@ -152,72 +139,11 @@ document.addEventListener('DOMContentLoaded', function() {
    const revisionType = document.getElementById('revision-type');
    const saveBtn = document.getElementById('save-btn');
    const downloadBtn = document.getElementById('download-btn');
-    const displayModeToggle = document.getElementById('display-mode-toggle');
-    const modeMarkdown = document.getElementById('mode-markdown');
-    const modeHtml = document.getElementById('mode-html');
    
    const fileId = '<%= file.id %>';
    const content = <%- JSON.stringify(content) %>;
    let currentRevisedContent = '';
    let currentRevisionType = '';
-    let currentDisplayMode = 'markdown';
-    
-    // Handle display mode changes
-    function updateDisplayMode() {
-        if (!currentRevisedContent) return;
-        
-        const selectedMode = document.querySelector('input[name="displayMode"]:checked').value;
-        currentDisplayMode = selectedMode;
-        
-        renderRevisedContent(currentRevisedContent, selectedMode);
-    }
-    
-    // Render revised content based on display mode
-    async function renderRevisedContent(content, displayMode = 'markdown') {
-        try {
-            const response = await fetch('/api/render-revised-content', {
-                method: 'POST',
-                headers: {
-                    'Content-Type': 'application/json',
-                },
-                body: JSON.stringify({
-                    content: content,
-                    displayMode: displayMode,
-                    autoDetect: true
-                })
-            });
-            
-            const result = await response.json();
-            
-            if (result.success) {
-                if (displayMode === 'html') {
-                    // Render as HTML
-                    revisedContent.innerHTML = `<div class="rendered-markdown">${result.renderedContent}</div>`;
-                    
-                    // Show format detection info if available
-                    if (result.isMarkdownContent) {
-                        const formatInfo = document.createElement('div');
-                        formatInfo.className = 'alert alert-info alert-sm mb-2';
-                        formatInfo.innerHTML = '<small><i class="fas fa-info-circle me-1"></i>Markdown formatting detected and rendered</small>';
-                        revisedContent.insertBefore(formatInfo, revisedContent.firstChild);
-                    }
-                } else {
-                    // Show as raw markdown/text
-                    revisedContent.innerHTML = `<pre class="mb-0" style="white-space: pre-wrap; word-wrap: break-word;">${escapeHtml(result.renderedContent)}</pre>`;
-                }
-            } else {
-                throw new Error(result.error || 'Failed to render content');
-            }
-        } catch (error) {
-            console.error('Error rendering content:', error);
-            // Fallback to escaped text
-            revisedContent.innerHTML = `<pre class="mb-0" style="white-space: pre-wrap; word-wrap: break-word;">${escapeHtml(content)}</pre>`;
-        }
-    }
-    
-    // Add event listeners for display mode toggle
-    modeMarkdown.addEventListener('change', updateDisplayMode);
-    modeHtml.addEventListener('change', updateDisplayMode);
    
    reviseBtn.addEventListener('click', async function() {
        const type = revisionType.value;
@@ -227,7 +153,6 @@ document.addEventListener('DOMContentLoaded', function() {
        
        reviseBtn.disabled = true;
        revisionProgress.classList.remove('d-none');
-        displayModeToggle.style.display = 'none'; // Hide toggle during processing
        revisedContent.innerHTML = '<div class="text-center mt-5"><div class="spinner-border text-primary" role="status"><span class="visually-hidden">Processing...</span></div><p class="mt-2">AI is processing your notes...</p></div>';
        
        try {
@@ -250,15 +175,9 @@ document.addEventListener('DOMContentLoaded', function() {
            console.log('Revision result:', result);
            
            if (result.success) {
+                revisedContent.innerHTML = '<pre class="mb-0" style="white-space: pre-wrap; word-wrap: break-word;">' + escapeHtml(result.revisedContent) + '</pre>';
                currentRevisedContent = result.revisedContent;
                currentRevisionType = type;
-                
-                // Show display mode toggle
-                displayModeToggle.style.display = 'block';
-                
-                // Render content based on current display mode
-                await renderRevisedContent(currentRevisedContent, currentDisplayMode);
-                
                saveBtn.disabled = false;
                downloadBtn.disabled = false;
            } else {
--- a/views/upload.ejs
+++ b/views/upload.ejs
@@ -14,18 +14,12 @@
                        <i class="fas fa-cloud-upload-alt fa-3x text-primary mb-3"></i>
                        <h5>Drag & Drop your files here</h5>
                        <p class="text-muted">or click to browse</p>
-                        <input type="file" id="noteFile" name="noteFile" class="d-none" accept=".pdf,.doc,.docx,.txt,.xlsx,.xls,.md,.json,.csv,.xml">
+                        <input type="file" id="noteFile" name="noteFile" class="d-none" accept=".pdf,.doc,.docx,.txt,.jpg,.jpeg,.png,.gif">
                        <button type="button" class="btn btn-primary" onclick="document.getElementById('noteFile').click()">
                            <i class="fas fa-folder-open me-2"></i>Choose File
                        </button>
                    </div>

-                    <div class="alert alert-info mb-4">
-                        <i class="fas fa-info-circle me-2"></i>
-                        <strong>Supported file types:</strong> PDF, Word (.doc, .docx), Excel (.xlsx, .xls), text files (.txt, .md, .json, .csv, .xml)
-                        <br><small class="text-muted">Only text-extractable documents are allowed to ensure optimal AI processing and prevent RAG corruption.</small>
-                    </div>
-
                    <div id="file-info" class="d-none mb-4">
                        <div class="alert alert-info">
                            <i class="fas fa-file me-2"></i>
@@ -52,32 +46,25 @@
            </div>

            <div class="row mt-5">
-                <div class="col-md-3">
+                <div class="col-md-4">
                    <div class="text-center">
                        <i class="fas fa-file-pdf fa-2x text-danger mb-2"></i>
                        <h6>PDF Files</h6>
                        <p class="text-muted small">Upload PDF documents</p>
                    </div>
                </div>
-                <div class="col-md-3">
+                <div class="col-md-4">
                    <div class="text-center">
                        <i class="fas fa-file-word fa-2x text-primary mb-2"></i>
                        <h6>Word Documents</h6>
                        <p class="text-muted small">DOC & DOCX files</p>
                    </div>
                </div>
-                <div class="col-md-3">
+                <div class="col-md-4">
                    <div class="text-center">
-                        <i class="fas fa-file-excel fa-2x text-success mb-2"></i>
-                        <h6>Excel Files</h6>
-                        <p class="text-muted small">XLSX & XLS files</p>
-                    </div>
-                </div>
-                <div class="col-md-3">
-                    <div class="text-center">
-                        <i class="fas fa-file-alt fa-2x text-info mb-2"></i>
+                        <i class="fas fa-file-alt fa-2x text-success mb-2"></i>
                        <h6>Text Files</h6>
-                        <p class="text-muted small">TXT, MD, JSON, CSV, XML</p>
+                        <p class="text-muted small">Plain text documents</p>
                    </div>
                </div>
            </div>
Author	SHA1	Message	Date
kqjy	85651c9824	Merge pull request 'Improvements to quiz and dashboards.' (#9 ) from next into master Reviewed-on: #9	2025-07-08 15:16:12 +00:00
kqjy	7c003df9e9	Merge pull request 'Fix chatbot history not persistent; Fix uploaded notes disappearing; Fix Quiz Generation breaking' (#8 ) from next into master Reviewed-on: #8	2025-07-07 15:18:55 +00:00