Image.php

<?php 

$file = $file['temp']['file'];

$image = new Image($file);
$image->save(${filename}, [optional]${quality}); // Use this when moving a file from one location to another. Especially in the case when we upload a file to the server. 
$image->resize(${width}, ${height}, [optional]${crop}, [optional]${replace});
$image->createThumb(${width}, ${height}, [optional] ${save_path});
$image->getWidth();
$image->getHeight();


$image->crop()->save(); // Maybe? 

// Recursively create thumbnails based on config array
$thumbConfig = array(
    [
        'width' => 0,
        'height' => 0,
        'filename' => 0,
    ]
));
foreach($thumbConfig as $configItem) {
    list($filename, $width, $height) = $configItem;
    $image->createThumb($width, $height, $filename);
}

namespace Libraries;

/**
 * Image handling and manipulation library
 * 
 * This library makes use of the CodeIgniter image manipulation library.
 * @author Cosmo Mathieu <cosmo@cosmointeractive.co>
 */
class Image
{
    protected $adapter;

    protected $originalImage = '';

    protected $originalWidth = 0;

    protected $originalHeight = 0;

    protected $newImage = '';
    
    protected $width = 0;
    
    protected $height = 0;

    protected $type = '';

    protected $attr;

    /**
     * Setup naming policy for the image 
     * 
     * When to true an incremental number is appended to the end of the filename.
     * When false, images of the same filename are replaced.
     * @var bool
     */
    protected $allowDuplicates = true;
    
    public function __construct($image)
    {
        $this->adapter = ci()->load->library('image_lib');
        $this->originalImage = $image;
        list($width, $height, $type, $attr) = getimagesize($image);
        $this->originalWidth = $width;
        $this->originalHeight = $height;
        $this->type = $type;
        $this->attr = $attr;
    };

    protected function readinessCheck()
    {
        // Check for GD 
        // Check if image exists 
        // Check if save path is_writable
    }

    protected function _getProperties()
    {
        $this->newImage = $this->originalImage;
    }

    /**
     * Create a new version of the file, resize, and save to a new location 
     * 
     * @param  int $width  [description]
     * @param  int $height [description]
     * @param  bool $replace Replace the image if found, or keep both
     * @return [type]         [description]
     */
    public function resize($width, $height, $replace = true)
    {
        // $this->adapter->resize($width, $height);
        return $this->_resize($width, $height, $replace);
    }

    public function crop($top = 0, $left = 0, $right = 0, $bottom = 0)
    {
        $this->crop($top = 0, $left = 0, $right = 0, $bottom = 0);
        return $this;
    }

    /**
     * Save the provided image to a location specified 
     * 
     * @param  string $path The image path including filename and extension
     * @param  int $quality The image quality 
     * @return bool 
     */
    public function save($path = null, $quality = null)
    {
        // If path is empty or null, check if original filename is set and use that 
        if (is_null($path) || empty($path)) {
            $path = $this->originalImage;
        }

        // TODO: Add remaining logic 
    }

    protected function _crop($top = 0, $left = 0, $right = 0, $bottom = 0)
    {
        if ($left == 0 && $top == 0 && $right == 0 && $bottom == 0) {
            return false;
        }

        // Determine dimensions from coordinates 
        $newWidth = $this->originalWidth - $left - $right;
        $newHeight = $this->originalHeight - $top - $bottom;
            
        $config = array();
        $config['image_library'] = 'gd2';
        $config['source_image'] = $this->originalImage;
        $config['new_image'] = $this->originalImage;
        $config['create_thumb'] = true;
        $config['maintain_ratio'] = false;
        $config['width'] = $newWidth;
        $config['height'] = $newHeight;
        ci()->load->library('image_lib');
        ci()->image_lib->clear();        
        ci()->image_lib->initialize($config);
        ci()->image_lib->resize();
        ci()->image_lib->clear();

        // TODO: Add verification method 
    }
    
    protected function _resize($width, $height, $replace = true, $keepAspectRatio = true)
    {
        //The original sizes
        $original_width = $this->originalWidth;
        $original_height = $this->originalHeight;
        $ratio = $original_width / $original_height;

        //The requested sizes
        $requested_width = $width;
        $requested_height = $height;

        // Keep current dimensions of the requested image if both less than the current
        if ($original_width < $requested_width && $original_height < $requested_height) {                                                                                                                                     
            $requested_width = $original_width;                                                                                                     
            $requested_height = $original_height;
        }                                                                                                                                                               

        if ($requested_width == 0) {
            $requested_width = $original_width;
        }

        if ($requested_height == 0) {
            $requested_height = $original_height;
        }
                                                                                                                                    
        // Resize Image                                                                                                                                                 
        $config = array();
        $config['image_library']    = 'gd2';
        $config['source_image']     = $this->originalImage;
        $config['new_image']        = $this->newImage;
        $config['maintain_ratio']   = $keepAspectRatio;
        $config['height']           = $requested_height;  
        $config['width']            = $requested_width;
        ci()->load->library('image_lib');
        ci()->image_lib->clear();
        ci()->image_lib->initialize($config);
        ci()->image_lib->resize();
        ci()->image_lib->clear();

        // TODO: Add verification method
    }

    protected function logError($error, $severity = 0)
    {
        $this->errorMessages[] = $error;
        log_error($error, $severity);
    }

    // ---------------------------------------------------------------
    // Getters 
    // ---------------------------------------------------------------

    public function errorMessage()
    {
        return $this->errorMessages;
    }
}

namespace Libraries\Image\Adapter;

class AdapterInterface
{
    public function checkDependencies();

    protected function readinessCheck();
}

class AbstractAdapter
{
    /**
     * Required extensions
     *
     * @var array
     */
    protected $requiredExtensions = ["gd"];

    protected function readinessCheck()
    {
        // Check for GD 
    }

    public function resize();
}

namespace Libraries\Image\Adapter;

class Gd extends AbstractAdapter implements AdapterInterface;
{
    
}

namespace Libraries\Image\Adapter;

class CodeIgniter extends AbstractAdapter implements AdapterInterface
{
    
}

// Make this into a collection?
$gallery = new MediaGallery(${id});
$images = $gallery->getMediaGalleryImages();
$image = $images->getFirstItem();

{{ builder:gallery_block_html type="grid" id="${int}" filter="all|public|hidden" sort="asc|desc" }}