<?php
/**
* Title		: Aqua Resizer
* Description	: Resizes WordPress images on the fly
* Version	: 1.1.6
* 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
* @uses		wp_upload_dir()
* @uses		image_resize_dimensions() | image_resize()
* @uses		wp_get_image_editor()
*
* @return str|array
*/

function aq_resize( $url, $width, $height = null, $crop = null, $single = true ) {
	
	//validate inputs
	if (!$url OR !$width ) return false;
	
	//define upload path & dir
	$upload_info = wp_upload_dir();
	$upload_dir = $upload_info['basedir'];
	$upload_url = $upload_info['baseurl'];
	
	//check if $img_url is local
	if (strpos( $url, $upload_url ) === false ) 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);
	$dst_w = $dims[4];
	$dst_h = $dims[5];
	
	//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 (!$dst_h) {
		//can't resize, so return original url
		$img_url = $url;
		$dst_w = $orig_w;
		$dst_h = $orig_h;
	}
	//else check if cache exists
	elseif (file_exists($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 {
		
		// Note: This pre-3.5 fallback check will edited out in subsequent version
		if (function_exists( 'wp_get_image_editor')) {
		
			$editor = wp_get_image_editor($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;
			}
			
		} else {
		
			$resized_img_path = image_resize( $img_path, $width, $height, $crop ); // Fallback foo
			if (!is_wp_error($resized_img_path)) {
				$resized_rel_path = str_replace( $upload_dir, '', $resized_img_path);
				$img_url = $upload_url . $resized_rel_path;
			} else {
				return false;
			}
		
		}
		
	}
	
	//return the output
	if ($single) {
		//str return
		$image = $img_url;
	} else {
		//array return
		$image = array (
			0 => $img_url,
			1 => $dst_w,
			2 => $dst_h
		);
	}
	
	// RETINA Support - Added by WPExplorer --------------------------------------------------------------->
		
		if ( get_theme_mod('retina') == '1' ) {
			
			$retina_w = $dst_w*2;
			$retina_h = $dst_h*2;
			
			//get image size after cropping
			$dims_x2 = image_resize_dimensions($orig_w, $orig_h, $retina_w, $retina_h, $crop);
			$dst_x2_w = $dims_x2[4];
			$dst_x2_h = $dims_x2[5];
			
			// If possible lets make the @2x image
			if($dst_x2_h) {
			
				//@2x image url
				$destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}@2x.{$ext}";
				
				//check if retina image exists
				if(file_exists($destfilename) && getimagesize($destfilename)) {	
					// already exists, do nothing
				} else {
					// doesnt exist, lets create it
					$editor = wp_get_image_editor($img_path);
					if ( ! is_wp_error( $editor ) ) {
						$editor->resize( $retina_w, $retina_h, $crop );
						$editor->set_quality( 100 );
						$filename = $editor->generate_filename( $dst_w . 'x' . $dst_h . '@2x'  );
						$editor = $editor->save($filename);	
					}
				}
			
			}
		
		}
		
		
		// Return image --------------------------------------------------------------->
		return $image;
}