<?php if(! defined('ABSPATH')){ return; }

/**
  *  Resizes an image and returns the resized URL. Uses native WordPress functionality.
  *
  *  The function supports GD Library and ImageMagick. WordPress will pick whichever is most appropriate.
  *  If none of the supported libraries are available, the function will return the original image url.
  *
  *  Images are saved to the WordPress uploads directory, just like images uploaded through the Media Library.
  *
  *  Supports WordPress 3.5 and above.
  *
  *  Based on resize.php by Matthew Ruddy (GPLv2 Licensed, Copyright (c) 2012, 2013)
  *  https://github.com/MatthewRuddy/Wordpress-Timthumb-alternative
  *
  *  License: GPLv2
  *  http://www.gnu.org/licenses/gpl-2.0.html
  *
  *  @author Ernesto Méndez (http://der-design.com)
  *  @author Matthew Ruddy (http://rivaslider.com)
  */

add_action('delete_attachment', 'mr_delete_resized_images');

function mr_image_resize($url, $width=null, $height=null, $crop=true, $align='c', $retina=false) {

	global $wpdb;
	$_ext = pathinfo($url, PATHINFO_EXTENSION);

	// Don't resize svg or Gif images
	if($_ext == 'svg' || $_ext == 'gif') {
		return $url;
	}
  // Get common vars (func_get_args() only get specified values)
  $common = mr_common_info($url, $width, $height, $crop, $align, $retina);

  // Unpack vars if got an array...
  if (is_array($common)) extract($common);
  // ... Otherwise, return error, null or image
  else return $common;

	$force_image_size = apply_filters('hg_force_image_resize', false);

  if( $force_image_size && ( $orig_width < $width ) ) {
		$get_attachment = false; 
		// Resized image url 
		$resized_url = $url; 
	}
  elseif (!file_exists($dest_file_name)) {

	// We only want to resize Media Library images, so we can be sure they get deleted correctly when appropriate.
	$query = $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE guid='%s'", $url);
	$get_attachment = $wpdb->get_results($query);

	// Load WordPress Image Editor
	$editor = wp_get_image_editor($file_path);

	// Print possible wp error
	if (is_wp_error($editor)) {
	  if (is_user_logged_in());
	  return null;
	}

	if ($crop) {

	  $src_x = $src_y = 0;
	  $src_w = $orig_width;
	  $src_h = $orig_height;

	  $cmp_x = $orig_width / $dest_width;
	  $cmp_y = $orig_height / $dest_height;

	  // Calculate x or y coordinate and width or height of source
	  if ($cmp_x > $cmp_y) {

		$src_w = round ($orig_width / $cmp_x * $cmp_y);
		$src_x = round (($orig_width - ($orig_width / $cmp_x * $cmp_y)) / 2);

	  } else if ($cmp_y > $cmp_x) {

		$src_h = round ($orig_height / $cmp_y * $cmp_x);
		$src_y = round (($orig_height - ($orig_height / $cmp_y * $cmp_x)) / 2);

	  }

	  // Positional cropping. Uses code from timthumb.php under the GPL
	  if ($align && $align != 'c') {
		if (strpos ($align, 't') !== false) {
		  $src_y = 0;
		}
		if (strpos ($align, 'b') !== false) {
		  $src_y = $orig_height - $src_h;
		}
		if (strpos ($align, 'l') !== false) {
		  $src_x = 0;
		}
		if (strpos ($align, 'r') !== false) {
		  $src_x = $orig_width - $src_w;
		}
	  }

	  // Crop image
	  $editor->crop($src_x, $src_y, $src_w, $src_h, $dest_width, $dest_height);

	} else {

	  // Just resize image
	  $editor->resize($dest_width, $dest_height);

	}

	// Save image
	$saved = $editor->save($dest_file_name);

	// Print possible out of memory error
	if (is_wp_error($saved)) {
	  if (is_user_logged_in()) {
		print_r($saved);
		unlink($dest_file_name);
	  }
	  return null;
	}

	// Add the resized dimensions and alignment to original image metadata, so the images
	// can be deleted when the original image is delete from the Media Library.
	if ($get_attachment) {
	  $metadata = wp_get_attachment_metadata($get_attachment[0]->ID);
	  if (isset($metadata['image_meta'])) {
		$md = $saved['width'] . 'x' . $saved['height'];
		if ($crop) $md .= ($align) ? "_${align}" : "_c";
		$metadata['image_meta']['resized_images'][] = $md;
		wp_update_attachment_metadata($get_attachment[0]->ID, $metadata);
	  }
	}

	// Resized image url
	$resized_url = str_replace(basename($url), basename($saved['path']), $url);

  } else {
	// Resized image url
	$resized_url = str_replace(basename($url), basename($dest_file_name), $url);

  }

  // Return resized url
  return $resized_url;

}

// Returns common information shared by processing functions

function mr_common_info($url, $width, $height, $crop, $align, $retina) {

  // Return null if url empty
  if (empty($url)) {
	return is_user_logged_in() ? "image_not_specified" : null;
  }

  // Return if nocrop is set on query string
  if (preg_match('/(\?|&)nocrop/', $url)) {
	return $url;
  }

  // Get the image file path
  $urlinfo = parse_url($url);
  $wp_upload_dir = wp_upload_dir();

  if (preg_match('/\/[0-9]{4}\/[0-9]{2}\/.+$/', $urlinfo['path'], $matches)) {
	$file_path = $wp_upload_dir['basedir'] . $matches[0];
  } else {

	// Get uploads dir config
	$wp_uploads_url = $wp_upload_dir['baseurl'];
	$wp_upload_path = $wp_upload_dir['basedir'];

	// Get file path relative to uploads dir
	$url_path = str_replace( $wp_upload_dir['baseurl'], '', $url );
	$file_path = $wp_upload_path . $url_path;

	// If the file doesn't exists, use the old wayto get the image
	if ( ! file_exists($file_path)) {
	  $pathinfo = parse_url( $url );
	  $uploads_dir = is_multisite() ? '/files/' : '/wp-content/';
	  $file_path = ABSPATH . str_replace( dirname($_SERVER['SCRIPT_NAME']) . '/', '', strstr($pathinfo['path'], $uploads_dir));
	  $file_path = preg_replace('/(\/\/)/', '/', $file_path);
	}
  }

  // Don't process a file that doesn't exist
  if (!file_exists($file_path)) {
	return null; // Degrade gracefully
  }

  // Get original image size
  $size = is_user_logged_in() ? getimagesize($file_path) : @getimagesize($file_path);

  // If no size data obtained, return error or null
  if (!$size) {
	return is_user_logged_in() ? "getimagesize_error_common" : null;
  }

  // Set original width and height
  list($orig_width, $orig_height, $orig_type) = $size;

  // Generate width or height if not provided
  if ($width && !$height) {
	$height = floor ($orig_height * ($width / $orig_width));
  } else if ($height && !$width) {
	$width = floor ($orig_width * ($height / $orig_height));
  } else if (!$width && !$height) {
	return $url; // Return original url if no width/height provided
  }

  // Allow for different retina sizes
  $retina = $retina ? ($retina === true ? 2 : $retina) : 1;

  // Destination width and height variables
  $dest_width = $width * $retina;
  $dest_height = $height * $retina;

  // Some additional info about the image
  $info = pathinfo($file_path);
  $dir = $info['dirname'];
  $ext = $info['extension'];
  $name = wp_basename($file_path, ".$ext");

  // Suffix applied to filename
  $suffix = "${dest_width}x${dest_height}";

  // Set align info on file
  if ($crop) {
	$suffix .= ($align) ? "_${align}" : "_c";
  }

  // Get the destination file name
  $dest_file_name = "${dir}/${name}-${suffix}.${ext}";

  // Return info
  return array(
	'dir' => $dir,
	'name' => $name,
	'ext' => $ext,
	'suffix' => $suffix,
	'orig_width' => $orig_width,
	'orig_height' => $orig_height,
	'orig_type' => $orig_type,
	'dest_width' => $dest_width,
	'dest_height' => $dest_height,
	'file_path' => $file_path,
	'dest_file_name' => $dest_file_name,
  );

}

// Deletes the resized images when the original image is deleted from the WordPress Media Library.

function mr_delete_resized_images($post_id) {

  // Get attachment image metadata
  $metadata = wp_get_attachment_metadata($post_id);

  // Return if no metadata is found
  if (!$metadata) return;

  // Return if we don't have the proper metadata
  if (!isset($metadata['file']) || !isset($metadata['image_meta']['resized_images'])) return;

  $wp_upload_dir = wp_upload_dir();
  $pathinfo = pathinfo($metadata['file']);
  $resized_images = $metadata['image_meta']['resized_images'];

  // Delete the resized images
  foreach ($resized_images as $dims) {

	// Get the resized images filename
	$file = $wp_upload_dir['basedir'] . '/' . $pathinfo['dirname'] . '/' . $pathinfo['filename'] . '-' . $dims . '.' . $pathinfo['extension'];

	// Delete the resized image (if it has not yet been deleted)
	@unlink($file);

  }

}


// RETURNS THE HTML FOR AN IMAGE - PROVIDE POST ID
function zn_get_post_image( $post_id = null , $width, $height=0, $attr = array() , $popup = false ){
	$post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
	$attachment_id = get_post_thumbnail_id( $post_id );

	return zn_get_image( $attachment_id , $width, $height, $attr , $popup );

}


function zn_get_image( $attachment_id = null , $width, $height=0, $attr = array() , $popup = false ) {

	if ( !$attachment_id ) {
		return;
	}

	$html = '';
	$image = wp_get_attachment_image_src( $attachment_id, 'full' );

	if ( $image ) {
	//  print_z($image);

		$resized = mr_image_resize( $image['0'], $width, $height, true , 'c' , false );

		if( is_array( $resized ) ){
			$hwstring = image_hwstring( $resized['width'], $resized['height'] );

		}
		else {
			$hwstring = image_hwstring( $width, $height );
			$resized = array(
				'url' => $resized,
				'width' => $width,
				'height' => $height
			);
		}


		$attachment = get_post( $attachment_id );

		$default_attr = array(
			'src'   => $resized['url'],
			'class' => "img-responsive",
			'alt'   => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )),
		);

		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt ));
		if ( empty($default_attr['alt']) )
			$default_attr['alt'] = trim(strip_tags( $attachment->post_title ));

		$attr = wp_parse_args($attr, $default_attr);
		$attr = array_map( 'esc_attr', $attr );

		// ADD MAGNIFIC POPUP functionality
		if ( $popup ) {
			$attr['data-mfp-src'] = $image[0];
		}

		$html = rtrim("<img $hwstring");

		foreach ( $attr as $name => $value ) {
			$html .= " $name=" . '"' . $value . '"';
		}

		$html .= ' />';

	}

	return $html;

}
