# Product Reduce Image Size Fix Controller Documentation

**File**: `/controllers/productReduceImageSizeFix.php`  
**Purpose**: Utility script to batch resize product images while preserving aspect ratio  
**Last Updated**: December 20, 2024  
**Total Functions**: 3+  
**Lines of Code**: ~149

---

## 📋 Overview

This utility script batch processes product images to reduce file sizes while maintaining aspect ratios. Used for:
- Optimizing product images for web display
- Reducing storage space and bandwidth
- Standardizing image dimensions
- Improving website performance

### Primary Functions
- [x] Batch image resizing
- [x] Aspect ratio preservation
- [x] Format conversion support
- [x] Performance optimization

---

## 🔑 Key Functions

### 1. **reduceImageSize()** - Core Resizing Function
**Location**: Line 76  
**Purpose**: Resize images while preserving aspect ratio

```php
function reduceImageSize($imageName, $targetDir, $targetDirDestination) {
    // 1. Get original dimensions
    list($width, $height, $type, $attr) = getimagesize($targetDir . $imageName_basename);
    
    // 2. Calculate new dimensions
    $newDim = getNewWidthHeightAfterReduce($width, $height);
    $width = $newDim[0];
    $height = $newDim[1];
    
    // 3. Load and resize
    $theImageURL = "../views/default/images/product_image/$imageName";
    $src = imagecreatefromstring(file_get_contents($theImageURL));
    $dst = imagecreatetruecolor($width, $height);
    
    // 4. Resample image
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $width, $height, $originalWidth, $originalHeight);
    
    // 5. Save resized image
    imagedestroy($src);
    imagepng($dst, $targetDirDestination . $imageName);
    imagedestroy($dst);
}
```

### 2. **getNewWidthHeightAfterReduce()** - Dimension Calculator
**Location**: Line 136  
**Purpose**: Calculate new dimensions maintaining aspect ratio

```php
function getNewWidthHeightAfterReduce($width, $height) {
    $ratio = $width / $height; // Calculate aspect ratio
    
    if ($ratio > 1) {
        // Landscape orientation
        $width = 500;
        $height = 500 / $ratio;
    } else {
        // Portrait orientation  
        $width = 500 * $ratio;
        $height = 500;
    }
    return array($width, $height);
}
```

### 3. **Batch Processing Loop**
**Location**: Lines 50-63  
**Purpose**: Process all products in batches

```php
$start = 0;
$limit = 50;
$all_products_count = $productExt->getProductsCount('', $joinConditionWithStore);

for ($i = $start; $i <= $all_products_count->productId; $i += $limit) {
    $allproduct = $productExt->queryAllOrderedLimitedSimple($start, $limit);
    
    foreach ($allproduct as $value) {
        if (!empty($value->logo) && $value->logo != "." && $value->logo != "no image") {
            reduceImageSize($value->logo, 
                "../views/default/images/product_image/", 
                "../views/default/images/product_image_resized/");
            $count++;
        }
    }
    
    $start += $limit;
}
```

---

## 🔄 Workflows

### Workflow: Batch Image Resizing
```
┌─────────────────────────────────────────────────────────────┐
│              START: Image Resize Process                   │
└────────────────────┬────────────────────────────────────────┘
                     │
                     ▼
┌─────────────────────────────────────────────────────────────┐
│  1. Initialize Processing                                   │
│     - Set batch parameters (limit=50)                      │
│     - Get total product count                              │
│     - Create output directory if needed                    │
└────────────────────┬────────────────────────────────────────┘
                     │
                     ▼
┌─────────────────────────────────────────────────────────────┐
│  2. Batch Processing Loop                                   │
│     FOR EACH batch of 50 products:                         │
│       │                                                     │
│       ├─→ Load product batch                               │
│       │                                                     │
│       ├─→ FOR EACH product with valid image:               │
│       │   ├─ Get original image dimensions                 │
│       │   ├─ Calculate new dimensions (max 500px)          │
│       │   ├─ Maintain aspect ratio                         │
│       │   ├─ Load original image                           │
│       │   ├─ Create resized version                        │
│       │   ├─ Save to resized directory                     │
│       │   └─ Clean up memory                               │
│       │                                                     │
│       └─→ Move to next batch                               │
└────────────────────┬────────────────────────────────────────┘
                     │
                     ▼
┌─────────────────────────────────────────────────────────────┐
│  3. Completion Report                                       │
│     - Display success message                               │
│     - Show count of processed images                        │
│     - Report time taken                                     │
└─────────────────────────────────────────────────────────────┘
```

---

## 🧮 Calculation Methods

### Aspect Ratio Preservation
```php
$ratio = $width / $height;

// For landscape images (width > height)
if ($ratio > 1) {
    $new_width = 500;           // Fixed width
    $new_height = 500 / $ratio; // Calculated height
}

// For portrait images (height > width) 
else {
    $new_width = 500 * $ratio;  // Calculated width
    $new_height = 500;          // Fixed height
}
```

### Size Calculation Example
```php
// Original: 1000x600 (landscape)
$ratio = 1000 / 600 = 1.67
$new_width = 500
$new_height = 500 / 1.67 = 300
// Result: 500x300 (maintains ratio)

// Original: 600x1000 (portrait)
$ratio = 600 / 1000 = 0.6
$new_width = 500 * 0.6 = 300
$new_height = 500
// Result: 300x500 (maintains ratio)
```

---

## 🔒 Security & Permissions

### File System Access
```php
// Check if output directory exists
if (!file_exists($targetDirDestination . "../")) {
    mkdir($targetDirDestination . "../product_image_resized/", 0777, true);
}
```

### Image Validation
- Uses `getimagesize()` for validation
- Filters out invalid image names
- Proper memory management with `imagedestroy()`

---

## ⚠️ Issues Identified

### 1. **Variable Reference Error**
**Location**: Line 49  
**Issue**: Undefined variable `$joinConditionWithStore`
```php
$all_products_count = $productExt->getProductsCount('', $joinConditionWithStore);
// $joinConditionWithStore is not defined in this script
```

### 2. **Syntax Error**
**Location**: Lines 131-133  
**Issue**: Missing semicolon and orphaned semicolon
```php
return $newParcode    // Missing semicolon
;                     // Orphaned semicolon
```

### 3. **Directory Path Issues**
**Location**: Line 86-88  
**Issue**: Complex directory path logic
```php
if (!file_exists($targetDirDestination . "../")) {
    mkdir($targetDirDestination . "../product_image_resized/", 0777, true);
}
// Unclear directory structure
```

---

## 📊 Performance Considerations

### Memory Management
```php
// Proper cleanup after each image
imagedestroy($src);
imagedestroy($dst);
```

### Batch Processing
- 50 images per batch prevents memory exhaustion
- Progressive processing for large datasets

### Output Format
- Always outputs as PNG for consistency
- May increase file size vs JPEG for some images

---

## 🧪 Testing Scenarios

### Test Case 1: Various Aspect Ratios
```
1. Test with landscape images (16:9, 4:3)
2. Test with portrait images (3:4, 9:16)  
3. Test with square images (1:1)
4. Verify aspect ratio preservation
```

### Test Case 2: File Handling
```
1. Test with different input formats (jpg, png, gif)
2. Verify output consistency (all PNG)
3. Check directory creation
4. Validate file permissions
```

---

## 📚 Recommendations

### Fix Variable Issue
```php
// Define missing variable or remove dependency
$joinConditionWithStore = '';
// OR
$all_products_count = $productExt->getProductsCount();
```

### Fix Syntax Error
```php
// Remove orphaned code from barcode function
// This function doesn't belong in this script
```

### Improve Error Handling
```php
if (!$src) {
    error_log("Failed to load image: $theImageURL");
    return false;
}
```

### Add Format Flexibility
```php
// Determine output format based on input
$extension = pathinfo($imageName, PATHINFO_EXTENSION);
if ($extension === 'jpg' || $extension === 'jpeg') {
    imagejpeg($dst, $targetDirDestination . $imageName, 85);
} else {
    imagepng($dst, $targetDirDestination . $imageName);
}
```

---

**Documented By**: AI Assistant  
**Review Status**: ⚠️ Needs Review - Contains undefined variables and syntax errors  
**Next Review**: Fix variable references and syntax errors