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<?php

/**
 * Title         : Aqua Resizer
 * Description   : Resizes WordPress images on the fly
 * Version       : 1.2.0
 * Author        : Syamil MJ
 * Author URI    : http://aquagraphite.com
 * License       : WTFPL - http://sam.zoy.org/wtfpl/
 * Documentation : https://github.com/sy4mil/Aqua-Resizer/
 *
 * @param string $url - (required) must be uploaded using wp media uploader
 * @param int $width - (required)
 * @param int $height - (optional)
 * @param bool $crop - (optional) default to soft crop
 * @param bool $single - (optional) returns an array if false
 * @return str|array
 * @uses  image_resize_dimensions()
 * @uses  wp_get_image_editor()
 *
 * @uses  wp_upload_dir()
 */

if (!defined('ABSPATH')) exit();

if (!class_exists('Essential_Grid_Aqua_Resize')) {
	
	class Essential_Grid_Aqua_Resize
	{
		/**
		 * The singleton instance
		 */
		static private $instance = null;

/**
		 * No initialization allowed
		 */
		private function __construct()
		{
		}

/**
		 * No cloning allowed
		 */
		private function __clone()
		{
		}

/**
		 * For your custom default usage you may want to initialize an Aq_Resize object by yourself and then have own defaults
		 */
		static public function getInstance()
		{
			if (self::$instance == null) {
				self::$instance = new self;
			}

return self::$instance;
		}

/**
		 * Run, forest.
		 */
		public function process($url, $width = null, $height = null, $crop = null, $single = true, $upscale = false)
		{
			// Validate inputs.
			if (!$url || (!$width && !$height)) return false;

// Caipt'n, ready to hook.
			if (true === $upscale) add_filter('image_resize_dimensions', array($this, 'aq_upscale'), 10, 6);

// Define upload path & dir.
			$upload_info = wp_upload_dir();
			$upload_dir = $upload_info['basedir'];
			$upload_url = $upload_info['baseurl'];

$http_prefix = "http://";
			$https_prefix = "https://";

/* if the $url scheme differs from $upload_url scheme, make them match
			   if the schemes differe, images don't show up. */
			if (!strncmp($url, $https_prefix, strlen($https_prefix))) { 
				//if url begins with https:// make $upload_url begin with https:// as well
				$upload_url = str_replace($http_prefix, $https_prefix, $upload_url);
			} elseif (!strncmp($url, $http_prefix, strlen($http_prefix))) { 
				//if url begins with http:// make $upload_url begin with http:// as well
				$upload_url = str_replace($https_prefix, $http_prefix, $upload_url);
			}

// Check if $img_url is local.
			if (false === strpos($url, $upload_url)) return false;

// Define path of image.
			$rel_path = str_replace($upload_url, '', $url);
			$img_path = $upload_dir . $rel_path;

// Check if img path exists, and is an image indeed.
			if (!file_exists($img_path) or !getimagesize($img_path)) return false;

// Get image info.
			$info = pathinfo($img_path);
			$ext = $info['extension'];
			list($orig_w, $orig_h) = getimagesize($img_path);

// Get image size after cropping.
			$dims = image_resize_dimensions($orig_w, $orig_h, $width, $height, $crop);
			if ($dims !== false && isset($dims[4]) && isset($dims[5])) {
				$dst_w = $dims[4];
				$dst_h = $dims[5];
			} else {
				$img_url = $url;
				$dst_w = $orig_w;
				$dst_h = $orig_h;
			}

// Return the original image only if it exactly fits the needed measures.
			if (!$dims && (((null === $height && $orig_w == $width) xor (null === $width && $orig_h == $height)) xor ($height == $orig_h && $width == $orig_w))) {
				$img_url = $url;
				$dst_w = $orig_w;
				$dst_h = $orig_h;
			} else {
				// Use this to check if cropped image already exists, so we can return that instead.
				$suffix = "{$dst_w}x{$dst_h}";
				$dst_rel_path = str_replace('.' . $ext, '', $rel_path);
				$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";

if (!$dims || (true == $crop && false == $upscale && ($dst_w < $width || $dst_h < $height))) {
					// Can't resize, so return false saying that the action to do could not be processed as planned.
					return false;
				} // Else check if cache exists.
				elseif (file_exists($destfilename) && getimagesize($destfilename)) {
					$img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
				} // Else, we resize the image and return the new resized image url.
				else {

$editor = wp_get_image_editor($img_path);

if (is_wp_error($editor) || is_wp_error($editor->resize($width, $height, $crop)))
						return false;

$resized_file = $editor->save();

if (!is_wp_error($resized_file)) {
						$resized_rel_path = str_replace($upload_dir, '', $resized_file['path']);
						$img_url = $upload_url . $resized_rel_path;
					} else {
						return false;
					}

}
			}

// Okay, leave the ship.
			if (true === $upscale) remove_filter('image_resize_dimensions', array($this, 'aq_upscale'));

// Return the output.
			if ($single) {
				// str return.
				$image = $img_url;
			} else {
				// array return.
				$image = array(
					0 => $img_url,
					1 => $dst_w,
					2 => $dst_h
				);
			}

return $image;
		}

/**
		 * Callback to overwrite WP computing of thumbnail measures
		 */
		function aq_upscale($default, $orig_w, $orig_h, $dest_w, $dest_h, $crop)
		{
			if (!$crop) return null; // Let the wordpress default function handle this.

// Here is the point we allow to use larger image size than the original one.
			$aspect_ratio = $orig_w / $orig_h;
			$new_w = $dest_w;
			$new_h = $dest_h;

if (!$new_w) {
				$new_w = intval($new_h * $aspect_ratio);
			}

if (!$new_h) {
				$new_h = intval($new_w / $aspect_ratio);
			}

$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

$crop_w = round($new_w / $size_ratio);
			$crop_h = round($new_h / $size_ratio);

$s_x = floor(($orig_w - $crop_w) / 2);
			$s_y = floor(($orig_h - $crop_h) / 2);

return array(0, 0, (int)$s_x, (int)$s_y, (int)$new_w, (int)$new_h, (int)$crop_w, (int)$crop_h);
		}
	}
}

if (!function_exists('esg_aq_resize')) {
	/**
	 * This is just a tiny wrapper function for the class above so that there is no
	 * need to change any code in your own WP themes. Usage is still the same :)
	 */
	function esg_aq_resize($url, $width = null, $height = null, $crop = null, $single = true, $upscale = false)
	{
		$aq_resize = Essential_Grid_Aqua_Resize::getInstance();
		$img = $aq_resize->process($url, $width, $height, $crop, $single, $upscale);
		if ($single) {
			return ($img == '') ? $url : $img;
		} else {
			return (empty($img)) ? $url : $img;
		}
	}
}