Merge pull request 'Fixes and improvements' (#14) from next into master

Reviewed-on: #14

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
+- **File Handling**: Multer for file uploads
-- **Document Processing**: 
+- **AI Integration**: Flowise API integration
-  - 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
 - **Session Management**: Express Session with flash messages
-- **Security**: File type whitelisting, secure extraction methods
+- **Styling**: Custom CSS with Bootstrap
-- **Styling**: Custom CSS with Bootstrap and custom SVG favicon
 
 ## 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:
+3. Select a file (PDF, DOC, TXT, or image)
-   - **Documents**: PDF, DOC, DOCX
-   - **Spreadsheets**: XLSX, XLS  
-   - **Text Files**: TXT, MD, JSON, CSV, XML
 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/
+│   └── images/
-│   │   └── favicon.svg
+│       └── logo.png
-│   ├── favicon.svg
-│   └── favicon-32x32.svg
 ├── 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
+- `POST /upload` - Handle file uploads
-- `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
 - `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
+- **Allowed formats**: PDF, DOC, DOCX, TXT, JPG, JPEG, PNG, GIF
-- **Upload directory**: `uploads/` (original files)
+- **Upload directory**: `uploads/`
-- **Revised notes directory**: `uploads/revised-notes/`
-- **Security**: Strict file type whitelisting with MIME type validation
-- **Processing**: Automatic text extraction with error handling
 
 ## 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)
+   - Verify file format is supported
-   - Ensure `uploads/` and `uploads/revised-notes/` directories exist
+   - Ensure `uploads/` directory exists
-   - Check file type validation in both client and server
 
-2. **Document extraction errors**:
+2. **AI responses don't work**:
-   - 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**:
    - 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**:
+3. **Session issues**:
-   - Ensure document has sufficient text content
+   - Verify SESSION_SECRET is set
-   - 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
    - 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

package-lock.json

@@ -14,7 +14,6 @@
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       "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",

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"

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;
-    }
-}

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>

views/dashboard.ejs

@@ -890,100 +890,25 @@ async function previewRevisedFile(fileId) {
         
         const file = fileInfo.file;
         
-        // Get file content using the new API endpoint
+        // Download the file content
-        const contentResponse = await fetch(`/api/revised-files/${fileId}/content`);
+        const contentResponse = await fetch(`/uploads/revised-notes/${file.filename}`);
         if (!contentResponse.ok) {
             throw new Error('Failed to load file content');
         }
         
-        const contentResult = await contentResponse.json();
+        const content = await contentResponse.text();
-        if (!contentResult.success) {
-            throw new Error('Failed to load file content');
-        }
-        
-        const content = contentResult.content;
         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">
-                <div class="alert alert-info mb-0 flex-grow-1 me-3">
+                <i class="fas fa-brain me-2"></i>
-                    <i class="fas fa-brain me-2"></i>
+                <strong>AI-Revised Content</strong> • ${file.revisionType} • From: ${file.originalFileName || 'Unknown'}
-                    <strong>AI-Revised Content</strong> • ${file.revisionType} • From: ${file.originalFileName || 'Unknown'}
-                </div>
-                <div class="btn-group btn-group-sm" role="group" id="preview-display-mode">
-                    <input type="radio" class="btn-check" name="previewDisplayMode" id="preview-mode-markdown" value="markdown" checked>
-                    <label class="btn btn-outline-secondary" for="preview-mode-markdown" title="Show as Markdown">
-                        <i class="fab fa-markdown"></i>
-                    </label>
-                    
-                    <input type="radio" class="btn-check" name="previewDisplayMode" id="preview-mode-html" value="html">
-                    <label class="btn btn-outline-secondary" for="preview-mode-html" title="Render as HTML">
-                        <i class="fas fa-code"></i>
-                    </label>
-                </div>
             </div>
-            <div id="preview-content-container" class="border p-3 bg-light rounded" style="max-height: 400px; overflow-y: auto;">
+            <div class="border p-3 bg-light rounded" style="max-height: 400px; overflow-y: auto;">
-                <pre style="white-space: pre-wrap; word-wrap: break-word; margin: 0;">${escapeHtml(content)}</pre>
+                <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);

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">

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>
-                                <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>
                             <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 {

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>
+                        <i class="fas fa-file-alt 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>
                         <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>