# Products Backend - Complete Implementation

## Overview

The products backend has been enhanced with comprehensive features including:

- ✅ Color variant support for images
- ✅ Rich text editor support for descriptions
- ✅ Active/Featured/Bestseller status flags
- ✅ Complete product metadata (SKU, weight, dimensions, material)
- ✅ Multiple images per product with color associations
- ✅ Automatic slug generation
- ✅ Full CRUD operations

## Database Schema

### Products Table

Enhanced with new fields:

- `weight` - Product weight (decimal)
- `dimensions` - Product dimensions (string)
- `material` - Product material description
- `metakeywords` - SEO keywords
- Existing: `name`, `slug`, `description`, `shortdescription`, `price`, `sku`, `category`, `isactive`, `isfeatured`, `isbestseller`, `stockquantity`

### Product Images Table (New)

Stores product images with color variant associations:

```sql
CREATE TABLE product_images (
  id TEXT PRIMARY KEY,
  product_id TEXT REFERENCES products(id) ON DELETE CASCADE,
  image_url VARCHAR(500) NOT NULL,
  color_variant VARCHAR(100),
  alt_text VARCHAR(255),
  display_order INTEGER DEFAULT 0,
  is_primary BOOLEAN DEFAULT FALSE,
  created_at TIMESTAMP DEFAULT NOW()
);
```

**Features:**

- Multiple images per product
- Color variant tagging (e.g., "Red", "Blue", "Ocean Blue")
- Display order control
- Primary image designation
- Automatic cleanup on product deletion (CASCADE)

## API Endpoints

### Admin Endpoints (Require Authentication)

#### 1. List All Products

```
GET /api/admin/products
```

**Response:**

```json
{
  "success": true,
  "products": [
    {
      "id": "prod-123",
      "name": "Product Name",
      "price": 99.99,
      "stockquantity": 10,
      "isactive": true,
      "isfeatured": false,
      "isbestseller": true,
      "category": "Art",
      "createdat": "2025-12-19T...",
      "image_count": 3
    }
  ]
}
```

#### 2. Get Single Product

```
GET /api/admin/products/:id
```

**Response:**

```json
{
  "success": true,
  "product": {
    "id": "prod-123",
    "name": "Sunset Canvas",
    "slug": "sunset-canvas",
    "shortdescription": "Beautiful sunset art",
    "description": "<p>Full HTML description...</p>",
    "price": 249.99,
    "stockquantity": 10,
    "category": "Canvas Art",
    "sku": "ART-001",
    "weight": 2.5,
    "dimensions": "24x36 inches",
    "material": "Acrylic on Canvas",
    "isactive": true,
    "isfeatured": true,
    "isbestseller": false,
    "images": [
      {
        "id": "img-1",
        "image_url": "/uploads/sunset-main.jpg",
        "color_variant": "Original",
        "alt_text": "Sunset Canvas - Main",
        "display_order": 0,
        "is_primary": true
      },
      {
        "id": "img-2",
        "image_url": "/uploads/sunset-blue.jpg",
        "color_variant": "Ocean Blue",
        "alt_text": "Sunset Canvas - Blue",
        "display_order": 1,
        "is_primary": false
      }
    ]
  }
}
```

#### 3. Create Product

```
POST /api/admin/products
Content-Type: application/json
```

**Request Body:**

```json
{
  "name": "Sunset Canvas Art",
  "shortdescription": "Beautiful hand-painted sunset",
  "description": "<p><strong>Premium canvas art</strong></p>",
  "price": 249.99,
  "stockquantity": 10,
  "category": "Canvas Art",
  "sku": "ART-SUNSET-001",
  "weight": 2.5,
  "dimensions": "24x36 inches",
  "material": "Acrylic on Canvas",
  "isactive": true,
  "isfeatured": true,
  "isbestseller": false,
  "images": [
    {
      "image_url": "/uploads/sunset-main.jpg",
      "color_variant": "Original",
      "alt_text": "Main view",
      "display_order": 0,
      "is_primary": true
    },
    {
      "image_url": "/uploads/sunset-blue.jpg",
      "color_variant": "Ocean Blue",
      "alt_text": "Blue variant",
      "display_order": 1
    }
  ]
}
```

**Response:**

```json
{
  "success": true,
  "message": "Product created successfully",
  "product": { /* Full product with images */ }
}
```

#### 4. Update Product

```
PUT /api/admin/products/:id
Content-Type: application/json
```

**Request Body:** (All fields optional)

```json
{
  "name": "Updated Name",
  "price": 199.99,
  "stockquantity": 15,
  "isbestseller": true,
  "images": [
    /* New complete images array - replaces all existing */
  ]
}
```

**Response:**

```json
{
  "success": true,
  "message": "Product updated successfully",
  "product": { /* Updated product with images */ }
}
```

#### 5. Delete Product

```
DELETE /api/admin/products/:id
```

**Response:**

```json
{
  "success": true,
  "message": "Product deleted successfully"
}
```

*Note: Product images are automatically deleted via CASCADE*

### Public Endpoints (No Authentication)

#### 1. List All Active Products

```
GET /api/public/products
```

Returns all active products with their images grouped by color variants.

#### 2. Get Featured Products

```
GET /api/public/products/featured?limit=4
```

Returns featured products (limited).

#### 3. Get Single Product

```
GET /api/public/products/:identifier
```

- `identifier` can be product ID or slug
- Only returns active products
- Includes all images with color variants

## Validation Rules

### Product Creation

- ✅ `name` - Required, 1-255 characters
- ✅ `shortdescription` - Optional, max 500 characters
- ✅ `description` - Optional, allows HTML (rich text)
- ✅ `price` - Required, must be >= 0
- ✅ `stockquantity` - Optional, must be >= 0, defaults to 0
- ✅ `category` - Optional string
- ✅ `sku` - Optional, max 100 characters
- ✅ `weight` - Optional, must be >= 0
- ✅ `dimensions` - Optional, max 100 characters
- ✅ `material` - Optional, max 255 characters
- ✅ `isactive` - Optional boolean, defaults to true
- ✅ `isfeatured` - Optional boolean, defaults to false
- ✅ `isbestseller` - Optional boolean, defaults to false
- ✅ `images` - Optional array of image objects

### Image Object

- `image_url` - Required, max 500 characters
- `color_variant` - Optional, max 100 characters
- `alt_text` - Optional, max 255 characters
- `display_order` - Optional integer
- `is_primary` - Optional boolean

## Features Implemented

### 1. Color Variants for Images

Each image can be tagged with a color variant name:

```javascript
images: [
  { image_url: "/img1.jpg", color_variant: "Red" },
  { image_url: "/img2.jpg", color_variant: "Blue" },
  { image_url: "/img3.jpg", color_variant: "Green" }
]
```

Frontend can:

- Display all color options
- Filter images by color
- Show color-specific views

### 2. Rich Text Description

The `description` field accepts HTML from rich text editors (like Quill):

```html
<p>This is <strong>bold</strong> and <em>italic</em></p>
<ul>
  <li>Feature 1</li>
  <li>Feature 2</li>
</ul>
```

### 3. Active Checkbox

Control product visibility:

- `isactive: true` - Visible on frontend
- `isactive: false` - Hidden from public, visible in admin

### 4. Additional Metadata

- `shortdescription` - Brief summary for listings
- `sku` - Stock keeping unit
- `weight` - Shipping calculations
- `dimensions` - Product size
- `material` - Product composition
- `isfeatured` - Highlight on homepage
- `isbestseller` - Mark popular items

### 5. Automatic Features

- ✅ Slug auto-generation from product name
- ✅ Unique slug enforcement
- ✅ Image cascade deletion
- ✅ Primary image designation
- ✅ Display order management

## Testing

Run the comprehensive test suite:

```bash
cd /media/pts/Website/SkyArtShop/backend
node test-products-api.js
```

Tests include:

- Product creation with multiple images
- Color variant assignment
- Rich text description
- Product retrieval
- Product updates
- Product deletion
- Public API access

## Migration

The database migration has been applied:

```bash
./run-migration.sh migrations/003_enhance_products.sql
```

**What it does:**

- ✅ Adds new columns to products table
- ✅ Creates product_images table
- ✅ Sets up foreign key relationships
- ✅ Creates performance indexes
- ✅ Generates slugs for existing products

## Next Steps for Frontend

### Admin Panel

1. **Product Form:**
   - Name input
   - Rich text editor for description (Quill)
   - Short description textarea
   - Price input
   - Stock quantity input
   - Category dropdown
   - SKU, weight, dimensions, material inputs
   - Active checkbox ✓
   - Featured checkbox
   - Bestseller checkbox

2. **Image Manager:**
   - Upload multiple images
   - Assign color variant to each image
   - Set display order
   - Mark primary image
   - Preview images by color

3. **Product List:**
   - Display all products in table
   - Show image count
   - Filter by active/featured/bestseller
   - Quick edit options

### Public Frontend

1. **Product Display:**
   - Show images with color variant selector
   - Render HTML description
   - Display all metadata
   - Add to cart functionality

2. **Product Filters:**
   - By category
   - By color variant
   - Featured products
   - Bestsellers

## Security Notes

- ✅ All admin endpoints require authentication
- ✅ Input validation on all fields
- ✅ SQL injection prevention (parameterized queries)
- ✅ XSS prevention (HTML sanitized on output)
- ✅ CASCADE delete prevents orphaned records

## Files Modified

1. **backend/migrations/003_enhance_products.sql** - Database migration
2. **backend/routes/admin.js** - Admin CRUD operations
3. **backend/routes/public.js** - Public product endpoints
4. **backend/middleware/validators.js** - Input validation
5. **backend/test-products-api.js** - API test suite
6. **backend/run-migration.sh** - Migration helper script

---

**Status:** ✅ Backend Complete and Ready for Frontend Integration
**Date:** December 19, 2025
