# Web Frontend for Mailing List Manager

This directory contains the web frontend for the Mailing List Manager - a clean, modern web interface for managing mailing lists and members.

## Features

- 🔐 **Token-based Authentication** - Secure access using API tokens
- 📧 **Mailing List Management** - Create, edit, and delete mailing lists
- 👥 **Member Management** - Add, edit, and remove members
- 🔗 **Subscription Management** - Subscribe/unsubscribe members to/from lists
- 📱 **Responsive Design** - Works on desktop, tablet, and mobile devices
- 🎨 **Clean UI** - Modern, professional interface with intuitive navigation
- ⚡ **Real-time Updates** - Immediate feedback and data refresh

## Architecture

### Frontend Stack
- **HTML5** - Semantic markup with accessibility features
- **CSS3** - Modern styling with CSS Grid/Flexbox and custom properties
- **Vanilla JavaScript** - No frameworks, just clean ES6+ code
- **Nginx** - Static file serving with compression and caching

### File Structure
```
web/
├── index.html           # Main HTML interface
├── static/
│   ├── css/
│   │   └── style.css    # Complete styling system
│   └── js/
│       ├── api.js       # API client for backend communication
│       ├── ui.js        # UI helpers and modal management
│       └── app.js       # Main application controller
├── Dockerfile           # Container configuration
├── nginx.conf           # Nginx server configuration
└── README.md           # This file
```

## Usage

### Accessing the Interface

**Via Docker (Recommended):**
```bash
# Ensure all services are running
sudo docker-compose up -d

# Access the web interface
open http://localhost:3000
```

**For Development:**
You can also open `index.html` directly in a browser, but the API must be running on port 8000.

### Getting Started

1. **Authenticate**: Enter your API_TOKEN (from `.env` file) when prompted
2. **Manage Lists**: Click the "Lists" tab to view and manage mailing lists
3. **Manage Members**: Click the "Members" tab to add and edit member information
4. **Manage Subscriptions**: Click "Subscriptions" button on any member to toggle their list memberships

The interface saves your token in browser storage, so you won't need to re-enter it on subsequent visits.

## Features Overview

### Authentication
- Secure token-based authentication
- Token persistence in browser storage
- Automatic logout on authentication errors

### Subscription Management (New & Improved!)

#### Member-Centric Subscription Management
The subscription management has been completely redesigned for the best user experience:

**How to Use:**
1. Navigate to the **Members** tab
2. Find the member you want to manage
3. Click the **"Subscriptions"** button next to their name
4. A modal appears showing all available mailing lists with toggle switches

**Visual Interface:**
- **Green toggle** = Member is subscribed to this list
- **Gray toggle** = Member is not subscribed to this list
- **Click anywhere** on a list item to toggle subscription on/off

**Batch Operations:**
- Make multiple changes (subscribe to some lists, unsubscribe from others)
- The "Save Changes" button shows how many changes you've made (e.g., "Save 3 Changes")
- All changes are saved together when you click "Save Changes"
- Click "Cancel" to discard all changes

**Benefits:**
- ✅ **Fast** - Toggle multiple subscriptions at once
- ✅ **Visual** - See all subscriptions at a glance with color coding
- ✅ **Intuitive** - Works like modern mobile app switches
- ✅ **Smart** - Only saves actual changes, not unchanged items
- ✅ **Clear** - Shows exactly how many changes you're about to save

#### Alternative: Legacy Bulk Subscription
For power users who prefer the old approach:
1. Go to the **Subscriptions** tab
2. Select list and member from dropdowns
3. Click "Add Subscription"

This is still available but the member-centric approach is much more efficient for managing multiple subscriptions.

### Mailing Lists
- View all mailing lists in a clean table
- Create new lists with name, email, and description
- Edit existing list details
- Delete lists with confirmation
- View member count for each list
- Status indicators (Active/Inactive)

### Members
- View all members with their details
- Add new members with name and email
- Edit member information
- Delete members with confirmation
- See which lists each member is subscribed to
- Status management

### Subscriptions
- **Member-centric subscription management** - Click on any member to manage their subscriptions
- **Interactive toggle interface** - Check/uncheck lists with visual toggles
- **Batch changes** - Make multiple subscription changes and save them all at once
- **Real-time feedback** - See subscription status instantly with visual indicators
- **Subscription overview** - View all subscriptions organized by list
- **Quick add functionality** - Legacy bulk subscription interface for power users

### User Experience
- **Responsive Design** - Works seamlessly on all device sizes
- **Loading States** - Visual feedback during API operations
- **Error Handling** - Clear error messages and graceful degradation
- **Notifications** - Success/error notifications with auto-dismiss
- **Confirmation Dialogs** - Prevent accidental deletions
- **Keyboard Shortcuts** - Enter key support in forms
- **Accessibility** - Semantic HTML and ARIA labels

## API Integration

The frontend communicates with the FastAPI backend through a comprehensive API client:

- **Authentication** - Bearer token authentication
- **Error Handling** - Automatic error parsing and user-friendly messages
- **Loading States** - Integrated loading indicators
- **Data Validation** - Client-side form validation before API calls

## Customization

### Styling
The CSS uses CSS custom properties (variables) for easy theming:

```css
:root {
    --primary-color: #2563eb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    /* ... more variables */
}
```

### Configuration
The API client automatically detects the backend URL based on the current hostname and can be configured for different environments.

## Browser Support

- Modern browsers (Chrome 60+, Firefox 55+, Safari 12+, Edge 79+)
- Mobile browsers (iOS Safari 12+, Chrome Mobile 60+)
- Progressive enhancement for older browsers