# 🐕 Sundog Dog Food Calorie Calculator

A professional veterinary nutrition tool for calculating dogs' daily calorie requirements and food amounts. Built for embedding on websites with complete brand protection options.

**By [Canine Nutrition and Wellness](https://caninenutritionandwellness.com)**

## ✨ Features

- **Accurate Calculations**: Uses veterinary-standard RER formula: `70 × (weight in kg)^0.75`
- **Multiple Activity Levels**: 11 different dog types and activity factors
- **Multi-Region Support**: kcal/100g (EU/UK), kcal/kg, kcal/cup, kcal/can (US/Canada)
- **Food Amount Calculator**: Converts calories to grams/kg/oz/lb of food
- **Scalable Widget**: Easily resize from 50% to 200% with data attributes
- **Theme Support**: Light, dark, and system themes
- **Responsive Design**: Mobile-first, works on all devices
- **Brand Integration**: Uses Canine Nutrition and Wellness color scheme
- **Two Embedding Options**: JavaScript widget and iframe
- **Accessibility**: Full keyboard navigation and screen reader support

## 🚀 Quick Start

### Option 1: JavaScript Widget (Recommended)
```html
<!-- Basic usage -->
<script src="https://yourdomain.com/sundog-dog-food-calculator.js"></script>
<div id="dog-calorie-calculator"></div>

<!-- With theme and scale options -->
<div id="dog-calorie-calculator" data-theme="dark" data-scale="0.8"></div>
```

### Option 2: iframe Embed
```html
<!-- Basic iframe -->
<iframe 
    src="https://yourdomain.com/iframe.html"
    width="100%" 
    height="600"
    frameborder="0"
    title="Dog Calorie Calculator">
</iframe>

<!-- With theme and scale parameters -->
<iframe 
    src="https://yourdomain.com/iframe.html?theme=dark&scale=1.2"
    width="100%" 
    height="600"
    frameborder="0"
    title="Dog Calorie Calculator">
</iframe>
```

## ⚙️ Configuration Options

### Theme Options
Choose from three themes:
- `light` - Light theme
- `dark` - Dark theme  
- `system` - Follows user's OS preference (default)

### Scale Options
Resize the widget from 50% to 200%:
- Range: `0.5` to `2.0`
- Default: `1.0` (100% size)
- Examples: `0.8` (80%), `1.2` (120%), `1.5` (150%)

### Food Energy Units
Support for regional differences:
- `kcal/100g` - European/UK standard (default)
- `kcal/kg` - North American standard
- `kcal/cup` - US/Canada dry food
- `kcal/can` - US/Canada wet food

### Advanced JavaScript Usage
```javascript
new DogCalorieCalculatorWidget(container, {
    theme: 'dark',    // 'light', 'dark', 'system'
    scale: 1.2        // 0.5 to 2.0
});
```

## 🛠️ Development

### Build System
This project uses a single source of truth approach:

- **Master Source**: `iframe.html` - Contains all functionality, styles, and calculations
- **Build Script**: `build.js` - Generates the widget from iframe.html 
- **Generated Output**: `sundog-dog-food-calculator.js` - Embeddable widget

### Development Workflow
1. **Make changes to `iframe.html`** - Edit calculations, design, layout, or functionality
2. **Run the build script**: `node build.js` 
3. **Done!** - Both iframe and widget now have identical functionality

### Why This Approach?
- ✅ **Single Source of Truth** - No need to maintain two separate files
- ✅ **Identical Functionality** - Widget matches iframe exactly
- ✅ **Easy Maintenance** - Edit once, deploy everywhere
- ✅ **No Sync Issues** - Build script ensures consistency

### Build Script Features
- Extracts CSS, HTML, and JavaScript from iframe.html
- Transforms CSS classes for widget namespacing (`dog-calculator-` → `dog-calc-`)
- Preserves all functionality including unit switching and calculations
- Maintains theme and scale support via data attributes

## 📁 Project Structure

```
├── iframe.html                    # 🎯 MASTER SOURCE - Edit this file
├── build.js                      # 🔧 Build script - Run after changes
├── sundog-dog-food-calculator.js  # 📦 Generated widget (don't edit)
├── test-widget.html              # 🧪 Test file for widget
└── README.md                     # 📖 This file
```

## 🎨 Brand Integration

The calculator uses your brand's color system:
- **Primary**: `#f19a5f` (Coral)
- **Secondary**: `#9f5999` (Purple)
- **Text**: `#6f3f6d` (Deep Purple)
- **Backgrounds**: Light purple tints
- **Font**: Montserrat

Colors automatically adapt to light/dark themes via CSS custom properties.

## 📊 Dog Activity Factors

| Dog Type | Factor | Use Case |
|----------|--------|----------|
| Puppy (0-4 months) | 3.0 | Rapid growth phase |
| Puppy (4 months - adult) | 2.0 | Continued growth |
| Adult - inactive/obese | 1.2 | Weight management |
| Adult (neutered/spayed) | 1.6 | Typical house pet |
| Adult (intact) | 1.8 | Unaltered adult |
| Adult - weight loss | 1.0 | Calorie restriction |
| Adult - weight gain | 1.7 | Weight building |
| Working dog - light work | 2.0 | Light activity |
| Working dog - moderate work | 3.0 | Regular work |
| Working dog - heavy work | 5.0 | Intensive work |
| Senior dog | 1.1 | Reduced activity |

## 🔧 Technical Implementation

### JavaScript Widget Features
- **Auto-initialization**: Detects `#dog-calorie-calculator` containers
- **CSS Namespacing**: All classes prefixed with `dog-calc-`
- **Shadow DOM Ready**: Prepared for better style isolation
- **Real-time Validation**: Input validation with error messages
- **Mobile Optimized**: Responsive breakpoints and touch-friendly

### iframe Features
- **Auto-resize**: Communicates height changes to parent
- **Style Isolation**: Complete protection from host site CSS
- **Loading Animation**: Smooth fade-in when ready
- **Cross-origin Ready**: PostMessage communication for integration

## 🚀 Deployment Guide

### 1. Host the Files
Upload these files to your web server:
- `sundog-dog-food-calculator.js` (for widget embedding)
- `iframe.html` (for iframe embedding)

### 2. Update URLs
Replace `https://yourdomain.com` in:
- `test-widget.html` examples
- `sundog-dog-food-calculator.js` comments
- This README

### 3. CDN Distribution (Optional)
For better performance, serve the widget script via CDN:
- Use CloudFlare, AWS CloudFront, or similar
- Enable CORS headers for cross-origin requests
- Set appropriate cache headers (1 day for updates)

### 4. Analytics Integration
Add tracking to understand usage:

```javascript
// Track widget interactions
document.addEventListener('DOMContentLoaded', function() {
    // Track when calculator is used
    document.addEventListener('change', function(e) {
        if (e.target.closest('.dog-calc-widget')) {
            gtag('event', 'calculator_interaction', {
                'event_category': 'dog_calculator',
                'event_label': e.target.id
            });
        }
    });
});
```

## 🔒 Brand Protection

### JavaScript Widget Risks
Users can override your styling with:
```css
.dog-calc-footer { display: none !important; }
```

### iframe Protection
Your branding is completely protected in iframe mode. Users cannot:
- Remove your footer link
- Modify your styling
- Access your content with JavaScript

## 📱 Mobile Optimization

- **Responsive breakpoints**: 576px (mobile), 850px (tablet)
- **Touch-friendly**: Larger tap targets on mobile
- **Input optimization**: Numeric keyboards for number inputs
- **Collapsible sections**: Better mobile space utilization

## 🧪 Testing

### Manual Testing Checklist
- [ ] All dog type selections work
- [ ] Weight validation (minimum 0.1kg)
- [ ] RER/MER calculations accurate
- [ ] Food energy unit selector (kcal/100g, kcal/kg, kcal/cup, kcal/can)
- [ ] Food energy validation (minimum values per unit)
- [ ] Unit conversions (g/kg/oz/lb) correct
- [ ] Theme switching (light/dark/system)
- [ ] Scale options (0.5x to 2.0x) work properly
- [ ] Collapsible section toggles
- [ ] Mobile responsive layout
- [ ] Branded footer link works
- [ ] Box shadows consistent across all sections

### Browser Compatibility
- ✅ Chrome 90+
- ✅ Firefox 88+
- ✅ Safari 14+
- ✅ Edge 90+
- ✅ Mobile Safari (iOS 14+)
- ✅ Chrome Mobile (Android 10+)

## 🤝 Contributing

This tool is maintained by Canine Nutrition and Wellness. For suggestions or issues:

1. Test the issue on the demo page
2. Provide specific browser/device information
3. Include steps to reproduce
4. Suggest improvements based on veterinary nutrition standards

## 📄 License

© 2024 Canine Nutrition and Wellness. All rights reserved.

This calculator is provided for educational and professional use. The formulas are based on established veterinary nutrition standards. Always consult with a veterinary nutritionist for specific dietary recommendations.

## 🔗 Links

- **Website**: [caninenutritionandwellness.com](https://caninenutritionandwellness.com)
- **Demo**: Open `embed-demo.html` in your browser
- **Standalone**: Open `index.html` in your browser

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**Built with ❤️ for canine nutrition professionals**