<?php

defined('ABSPATH') || exit;

if( ! class_exists('Better_image_sizes_resizer') ){
	class Better_image_sizes_resizer{
		private $detector = false;
		private $bis_dir = '';

		function __construct(){
			$this->bis_dir = apply_filters( 'bis_dir_path', $this->get_bis_dir() );

			$this->check_bis_dir();

			add_action( 'admin_menu', array( $this, 'admin_menu_item' ) );
			add_filter( 'media_row_actions', array( $this, 'media_row_action' ), 10, 2 );
			add_filter( 'attachment_fields_to_edit', array( $this, 'attachment_fields_to_edit' ), 10, 2 );
			add_action( 'delete_attachment', array( $this, 'delete_attachment_bis_images' ) );
			add_action( 'switch_blog', array( $this, 'blog_switched' ) );
			add_filter( 'intermediate_image_sizes_advanced', array( $this, 'remove_disabled_image_sizes' ) );
			add_filter( 'bis_get_attachment_image_attributes', array( $this, 'retina_attribute' ), 10, 4 );

			if( intval( get_option( 'bis_disable_big_image_size_threshold', 0 ) ) === 1 ){
				add_filter( 'big_image_size_threshold', '__return_false' );
			}
		}

		// make it works for multisite network
		function blog_switched(){
			$this->bis_dir = '';
			$this->bis_dir = apply_filters( 'bis_dir_path', $this->get_bis_dir() );
		}

		function get_bis_dir( $path = '' ){
			if( empty( $this->bis_dir ) ){
				$wp_upload_dir = wp_upload_dir();
				return $wp_upload_dir['basedir'] . DIRECTORY_SEPARATOR . 'bis-images' . ( $path !== '' ? DIRECTORY_SEPARATOR . $path : '' );
			}else{
				return $this->bis_dir . ( $path !== '' ? DIRECTORY_SEPARATOR . $path : '' );
			}
		}

		function check_bis_dir(){
			if( ! is_dir( $this->bis_dir ) ){
				wp_mkdir_p( $this->bis_dir );
			}
		}

		function bis_dir_writable(){
			return is_dir( $this->bis_dir ) && wp_is_writable( $this->bis_dir );
		}

		function delete_all_bis_images(){
			if( ! function_exists( 'WP_Filesystem' ) ) return false;
			WP_Filesystem();
			global $wp_filesystem;
			if( $wp_filesystem->rmdir( $this->get_bis_dir(), true ) ){
				$this->check_bis_dir();
				return true;
			}
			return false;
		}

		function delete_attachment_bis_images( $attachment_id = 0 ){
			if( ! function_exists( 'WP_Filesystem' ) ) return false;
			WP_Filesystem();
			global $wp_filesystem;
			return $wp_filesystem->rmdir( $this->get_bis_dir( $attachment_id ), true );
		}

		function admin_menu_item(){
			add_management_page(
				__( 'Better image sizes', 'bis-images' ),
				__( 'Better image sizes', 'bis-images' ),
				'read',
				BIS_BASE,
				array( $this, 'options_page' )
			);

			add_filter( 'plugin_action_links_' . BIS_BASE, function( $links, $file ){
				array_unshift( $links, '<a href="tools.php?page=' . BIS_BASE . '">' . __( 'Settings', '_new-plugin' ) . '</a>' );
				return $links;
			}, 10, 2 );
		}

		function get_all_image_sizes(){
			global $_wp_additional_image_sizes;
			$sizes = array();
			foreach( get_intermediate_image_sizes() as $_size ){
				if( in_array( $_size, array( 'thumbnail', 'medium', 'medium_large', 'large' ) ) ){
					$sizes[ $_size ]['w'] = get_option( "{$_size}_size_w" );
					$sizes[ $_size ]['h'] = get_option( "{$_size}_size_h" );
				}elseif( isset( $_wp_additional_image_sizes[ $_size ] ) ){
					$sizes[ $_size ] = array(
						'w' => $_wp_additional_image_sizes[ $_size ]['width'],
						'h' => $_wp_additional_image_sizes[ $_size ]['height'],
					);
				}
			}
			return $sizes;
		}

		function options_page(){
			if( isset( $_POST['bis_nonce'] ) && wp_verify_nonce( $_POST['bis_nonce'], 'delete_all_bis_images' ) ){
				if( current_user_can('manage_options') || current_user_can('regenerate_images') ){
					$this->delete_all_bis_images();
					echo '<div class="updated"><p>' . esc_html__( 'All cached images have been deleted.', 'bis-images' ) . '</p></div>';
				}
			}elseif( isset( $_POST['bis_disabled_upscaling_nonce'] ) && wp_verify_nonce( $_POST['bis_disabled_upscaling_nonce'], 'disabled_upscaling' ) ){
				if( current_user_can('manage_options') ){
					update_option( 'bis_disabled_upscaling', intval( $_POST['bis_disabled_upscaling'] ) );
					echo '<div class="updated"><p>' . esc_html__( 'Disable upscaling updated.', 'bis-images' ) . '</p></div>';
				}
			}elseif( isset( $_POST['bis_disabled_sizes_nonce'] ) && wp_verify_nonce( $_POST['bis_disabled_sizes_nonce'], 'disabled_sizes' ) ){
				if( current_user_can('manage_options') ){
					$sizes = $this->get_all_image_sizes();
					$bis_disabled_sizes = array();
					foreach( $_POST['bis_disabled_sizes'] as $key => $value ){
						if( isset( $sizes[ $key ] ) ){
							$bis_disabled_sizes[ $key ] = intval( $value );
						}
					}
					update_option( 'bis_disabled_sizes', $bis_disabled_sizes );
					echo '<div class="updated"><p>' . esc_html__( 'Disable autogenerated sizes updated.', 'bis-images' ) . '</p></div>';
				}
			}elseif( isset( $_POST['bis_disable_threshold_nonce'] ) && wp_verify_nonce( $_POST['bis_disable_threshold_nonce'], 'disable_threshold' ) ){
				if( current_user_can('manage_options') ){
					$disable_threshold = 0;
					if( isset( $_POST['bis_disable_big_image_size_threshold'] ) ){
						$disable_threshold = intval( $_POST['bis_disable_big_image_size_threshold'] );
					}
					update_option( 'bis_disable_big_image_size_threshold', $disable_threshold ? 1 : 0 );
					echo '<div class="updated"><p>' . esc_html__( 'Big image threshold updated.', 'bis-images' ) . '</p></div>';
				}
			}elseif( isset( $_GET['delete-bis-image'], $_GET['ids'], $_GET['bis_nonce'] ) && wp_verify_nonce( $_GET['bis_nonce'], 'delete_bis_image' ) ){
				if( current_user_can('manage_options') || current_user_can('regenerate_images') ){
					$ids = array_map( 'intval', array_map( 'trim', explode( ',', sanitize_key( $_GET['ids'] ) ) ) );
					if( ! empty( $ids ) ){
						foreach( $ids as $id ){
							$this->delete_attachment_bis_images( $id );
						}
						echo '<div class="updated"><p>' . esc_html__( 'All cached images for this media file have been deleted.', 'bis-images' ) . '</p></div>';
					}
				}
			}

			if( current_user_can('manage_options') ){ ?>
				<div class="wrap">
					<h2>Better image sizes</h2>

					<div class="card">
						<h3><?php esc_html_e( 'Images directory', 'bis-images' ); ?></h3>
						<p><code><?php echo esc_html( $this->get_bis_dir() ) ?></code></p>
						<?php if( $this->bis_dir_writable() ): ?>
							<p style="color:#7AD03A"><?php esc_html_e( 'Writeable', 'bis-images' ) ?></p>
						<?php else: ?>
							<p style="color:#A00"><?php esc_html_e( 'Not Writeable - please make sure this folder exists and is writeable!', 'bis-images' ) ?></p>
						<?php endif ?>
					</div>

					<div class="card">
						<h3><?php esc_html_e( 'Disable upscaling images', 'bis-images' ) ?></h3>
						<form method="post" action=""><?php
							wp_nonce_field( 'disabled_upscaling', 'bis_disabled_upscaling_nonce' );
							$bis_disabled_upscaling = get_option( 'bis_disabled_upscaling', 1 ); ?>
							<input type="hidden" name="bis_disabled_upscaling" value="0">
							<label>
								<input type="checkbox" name="bis_disabled_upscaling" value="1" <?php checked( $bis_disabled_upscaling, 1 ) ?>>
								<?php esc_html_e( 'return the full original image if it is smaller than the requested size', 'bis-images' ) ?>
							</label><br>
							<br><input class="button button-primary" value="<?php esc_html_e( 'Save', 'bis-images' ) ?>" type="submit">
						</form>
					</div>

					<div class="card">
						<h3><?php esc_html_e( 'Disable autogenerated sizes', 'bis-images' ) ?></h3>
						<p class="notice notice-info notice-large">
							<?php esc_html_e( 'You should not disable thumbnail size', 'bis-images' ); ?>
						</p>
						<form method="post" action=""><?php
							wp_nonce_field( 'disabled_sizes', 'bis_disabled_sizes_nonce' );
							$bis_disabled_sizes = get_option( 'bis_disabled_sizes', array() );
							$sizes = $this->get_all_image_sizes();
							foreach( $sizes as $size => $data ){
								if( ! isset( $bis_disabled_sizes[ $size ] ) ){
									$bis_disabled_sizes[ $size ] = 0;
								} ?>
								<label>
									<input type="checkbox" name="bis_disabled_sizes[<?php echo esc_attr( $size ) ?>]" value="1" <?php checked( $bis_disabled_sizes[ $size ], 1 ) ?>>
									<?php echo esc_html( $size ) ?> <small>(<?php echo esc_html( $data['w'] . 'x' . $data['h'] ) ?>)</small>
								</label><br><?php
							} ?>
							<br><input class="button button-primary" value="<?php esc_html_e( 'Save', 'bis-images' ) ?>" type="submit">
						</form>
					</div>

					<div class="card">
						<h3><?php esc_html_e( 'Disable big image size threshold', 'bis-images' ) ?></h3>
						<p><?php esc_html_e( 'WordPress will automatically scale down your uploaded images, if the original image width or height is above 2560px', 'bis-images' ) ?></p>
						<form method="post" action="">
							<?php wp_nonce_field( 'disable_threshold', 'bis_disable_threshold_nonce' ) ?>
							<label>
								<input type="checkbox" name="bis_disable_big_image_size_threshold" value="1" <?php checked( get_option( 'bis_disable_big_image_size_threshold', 0 ), 1 ) ?>>
								<?php esc_html_e( 'disable auto-scaling of big images', 'bis-images' ) ?>
							</label><br><br>
							<input class="button button-primary" value="<?php esc_html_e( 'Save', 'bis-images' ) ?>" type="submit">
						</form>
					</div>

					<div class="card">
						<h3><?php esc_html_e( 'Delete cached images', 'bis-images' ) ?></h3>
						<p><?php esc_html_e( 'Delete all generated image sizes for all images', 'bis-images' ) ?></p>
						<p><small><?php esc_html_e( '* they will be regenerated instantly when you visit your website', 'bis-images' ) ?></small></p>
						<br>
						<form method="post" action="">
							<?php wp_nonce_field( 'delete_all_bis_images', 'bis_nonce' ) ?>
							<input class="button button-primary" value="<?php esc_html_e( 'Delete all', 'bis-images' ) ?>" type="submit">
						</form>
					</div>
				</div><?php
			}
		}

		function remove_disabled_image_sizes( $sizes ){
			$bis_disabled_sizes = get_option( 'bis_disabled_sizes', array() );
			foreach( $bis_disabled_sizes as $key => $value ){
				if( intval( $value ) ){
					unset( $sizes[ $key ] );
				}
			}
			return $sizes;
		}

		function media_row_action( $actions, $post ){
			if( in_array( $post->post_mime_type, BIS_ALLOWED_MIME_TYPES ) ){
				$url = wp_nonce_url( admin_url( 'tools.php?page=' . BIS_BASE . '&delete-bis-image&ids=' . $post->ID ), 'delete_bis_image', 'bis_nonce' );
				$actions['bis-image-delete'] = '<a href="' . esc_url( $url ) . '" title="' . esc_attr( __( 'Delete all cached image sizes for this image', 'bis-images' ) ) . '">' . __( 'Regenerate BIS images', 'bis-images' ) . '</a>';
			}
			return $actions;
		}

		function attachment_fields_to_edit( $form_fields, $post ){
			if( in_array( get_post_mime_type( $post->ID ), BIS_ALLOWED_MIME_TYPES ) ){
				$url = wp_nonce_url( admin_url( 'tools.php?page=' . BIS_BASE . '&delete-bis-image&ids=' . $post->ID ), 'delete_bis_image', 'bis_nonce' );
				$form_fields['regenerate_bis_images'] = array(
					'value' => 1,
					'label' => __( 'Better image sizes', 'better-image-sizes' ),
					'input' => 'html',
					'html' => '<a class="button button-small" href="' . esc_url( $url ) . '" title="' . esc_attr( __( 'Delete all cached image sizes for this image', 'bis-images' ) ) . '">' . __( 'Regenerate', 'bis-images' ) . '</a>'
				);
			}
			return $form_fields;
		}

		function get_bis_file_name( $file_name, $width, $height, $crop ){
			$file_name_only = pathinfo( $file_name, PATHINFO_FILENAME );
			$file_extension = strtolower( pathinfo( $file_name, PATHINFO_EXTENSION ) );
			$crop_extension = '';
			if( $crop === true || $crop === 1 ){
				$crop_extension = '-c';
			}elseif( $crop === 'face' ){
				$crop_extension = '-fd';
			}elseif( is_array( $crop ) ){
				if( is_numeric( $crop[0] ) ){
					$crop_extension = '-f' . round( floatval( $crop[0] ) * 100 ) . '_' . round( floatval( $crop[1] ) * 100 );
				}else{
					$crop_extension = '-' . implode( '', array_map( function( $position ){
						return $position[0];
					}, $crop ) );
				}
			}
			return $file_name_only . '-' . intval( $width ) . 'x' . intval( $height ) . $crop_extension . '.' . $file_extension;
		}

		function get_bis_path( $absolute_path = '' ){
			$wp_upload_dir = wp_upload_dir();
			$path = $wp_upload_dir['baseurl'] . str_replace( $wp_upload_dir['basedir'], '', $absolute_path );
			return str_replace( DIRECTORY_SEPARATOR, '/', $path );
		}

		function get_attachment_image_src( $attachment_id = 0, $size = '', $crop = null ){
			if( $attachment_id < 1 || empty( $size ) ){
				return array();
			}

			if( $size == 'full' || ! in_array( get_post_mime_type( $attachment_id ), BIS_ALLOWED_MIME_TYPES ) ){
				$default_attachment = wp_get_attachment_image_src( $attachment_id, 'full' );
				if( is_array( $default_attachment ) ){
					return array_combine( array( 'src', 'width', 'height', 'resized' ), $default_attachment );
				}
				return array();
			}

			$image = wp_get_attachment_metadata( $attachment_id );
			if( $image ){
				switch( gettype( $size ) ){
					case 'array':
						$width = $size[0];
						$height = $size[1];
						break;
					default:
						return array();
				}

				// fix for images with 0 width or height - do not crop them
				if( intval( $width ) === 0 || intval( $height ) === 0 ){
					$crop = false;
				}

				// maybe load default focal point
				if( $crop === true || $crop === 1 ){
					$crop = sanitize_focal_point( get_post_meta( $attachment_id, 'focal_point', true ) );
				}

				$bis_dir = $this->get_bis_dir( $attachment_id );
				$bis_file_path = $bis_dir . DIRECTORY_SEPARATOR . $this->get_bis_file_name( basename( $image['file'] ), $width, $height, $crop );

				if( file_exists( $bis_file_path ) ){
					$image_size = getimagesize( $bis_file_path );
					if( ! empty( $image_size ) ){
						return array(
							'src' => $this->get_bis_path( $bis_file_path ),
							'width' => $image_size[0],
							'height' => $image_size[1],
						);
					}else{
						return array();
					}
				}

				$this->check_bis_dir();

				$image_editor = wp_get_image_editor( get_attached_file( $attachment_id ) );
				if( ! is_wp_error( $image_editor ) ){
					// maybe do face detection crop
					if( $crop === 'face' ){
						require_once('face-detector.php');
						if( $this->detector === false ){
							$this->detector = new FaceDetector();
						}
						$focal_point = $this->detector->faceDetect( get_attached_file( $attachment_id ) );
						if( $focal_point ){
							$crop = sanitize_focal_point( $focal_point );
						}else{
							$crop = sanitize_focal_point( get_post_meta( $attachment_id, 'focal_point', true ) );
						}
					}

					// create new image
					if( is_array( $crop ) && is_numeric( $crop[0] ) ){
						// get original image size
						$original_sizes = $image_editor->get_size();

						// sanitize and distribute parameters
						$dst_w = intval( $size[0] );
						$dst_h = intval( $size[1] );
						$focal_x = floatval( $crop[0] );
						$focal_y = floatval( $crop[1] );

						// maybe replace empty sizes
						if( ! $dst_w ) $dst_w = $original_sizes['width'];
						if( ! $dst_h ) $dst_h = $original_sizes['height'];

						// maybe disable upscaling
						if( intval( get_option( 'bis_disabled_upscaling', 1 ) ) ){
							if( $dst_w > $original_sizes['width'] || $dst_h > $original_sizes['height'] ){
								$dst_w = $original_sizes['width'];
								$dst_h = $original_sizes['height'];
							}
						}

						// calculate cropped image size
						$src_w = $original_sizes['width'];
						$src_h = $original_sizes['height'];

						if( $original_sizes['width'] / $original_sizes['height'] > $dst_w / $dst_h ){
							$src_w = round( $original_sizes['height'] * ( $dst_w / $dst_h ) );
						}else{
							$src_h = round( $original_sizes['width'] * ( $dst_h / $dst_w ) );
						}

						// calculate focal top left position
						$src_x = $original_sizes['width'] * $focal_x - $src_w * $focal_x;
						if( $src_x + $src_w > $original_sizes['width'] ){
							$src_x += $original_sizes['width'] - $src_w - $src_x;
						}
						if( $src_x < 0 ){
							$src_x = 0;
						}
						$src_x = round( $src_x );

						$src_y = $original_sizes['height'] * $focal_y - $src_h * $focal_y;
						if( $src_y + $src_h > $original_sizes['height'] ){
							$src_y += $original_sizes['height'] - $src_h - $src_y;
						}
						if( $src_y < 0 ){
							$src_y = 0;
						}
						$src_y = round( $src_y );

						// crop and resize
						$image_editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h );
					}else{
						$image_editor->resize( $width, $height, $crop );
					}
					$image_editor->save( $bis_file_path );

					// Trigger action
					do_action( 'bis_image_created', $attachment_id, $bis_file_path );

					// Image created, return its data
					$image_dimensions = $image_editor->get_size();
					return array(
						'src' => $this->get_bis_path( $bis_file_path ),
						'width' => $image_dimensions['width'],
						'height' => $image_dimensions['height'],
					);
				}
			}

			// Something went wrong
			return array();
		}

		function get_attachment_image( $attachment_id = 0, $size = '', $crop = null, $attr = array() ){
			if( $attachment_id < 1 || empty( $size ) ){
				return '';
			}

			if( $size == 'full' || ! in_array( get_post_mime_type( $attachment_id ), BIS_ALLOWED_MIME_TYPES ) ){
				return wp_get_attachment_image( $attachment_id, $size, false, $attr );
			}

			$html = '';
			$image = $this->get_attachment_image_src( $attachment_id, $size, $crop );
			if( $image ){
				$hwstring = image_hwstring( $image['width'], $image['height'] );
				$size_class = $size;
				if( is_array( $size_class ) ){
					$size_class = join( 'x', $size );
				}
				$attachment = get_post( $attachment_id );
				$default_attr = array(
					'src' => $image['src'],
					'class' => 'attachment-' . $size_class,
					'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 ) );
				}

				if( wp_lazy_loading_enabled( 'img', 'wp_get_attachment_image' ) ){
					$default_attr['loading'] = 'lazy';
				}

				$attr = wp_parse_args( $attr, $default_attr );

				if( array_key_exists( 'loading', $attr ) && ! $attr['loading'] ){
					unset( $attr['loading'] );
				}

				$attr = apply_filters( 'bis_get_attachment_image_attributes', $attr, $attachment, $size, $crop );

				$attr = array_map( 'esc_attr', $attr );
				$html = rtrim( "<img $hwstring" );
				foreach( $attr as $name => $value ){
					$html .= " $name=" . '"' . $value . '"';
				}
				$html .= ' />';
			}

			return apply_filters( 'bis_get_attachment_image', $html, $attachment_id, $size, $attr );
		}

		function get_attachment_picture( $attachment_id = 0, $sizes = array(), $attr = array() ){
			if( $attachment_id < 1 || ! is_array( $sizes ) || count( $sizes ) === 0 ){
				return '';
			}
			ksort( $sizes );
			$last_breakpoint = 0;
			$html = '<picture>';
			foreach( $sizes as $breakpoint => $data ){
				if( intval( $breakpoint ) && count( $data ) >= 2 ){
					$maybe_alternative_attachment_id = isset( $data[3] ) && $data[3] ? $data[3] : $attachment_id;
					$img = bis_get_attachment_image_src( $maybe_alternative_attachment_id, array( $data[0], $data[1] ), isset( $data[2] ) ? $data[2] : false );
					if( $img ){
						if( isset( $attr['retina'] ) && $attr['retina'] ){
							$retina = bis_get_attachment_image_src( $maybe_alternative_attachment_id, array( $data[0] * 2, $data[1] * 2 ), isset( $data[2] ) ? $data[2] : false );
							$srcset = $img['src'] . ' 1x, ' . $retina['src'] . ' 2x';
						}else{
							$srcset = $img['src'];
						}
						$html .= '<source media="(max-width:' . intval( $breakpoint ) . 'px)" srcset="' . $srcset . '">';
						$last_breakpoint = intval( $breakpoint );
					}
				}
			}
			$html .= '<source media="(min-width:' . ( $last_breakpoint + 1 ) . 'px)" srcset="' . wp_get_attachment_url( $attachment_id ) . '">';
			if( isset( $sizes[0] ) && count( $sizes[0] ) >= 2 ){
				$maybe_alternative_attachment_id = isset( $sizes[0][3] ) && $sizes[0][3] ? $sizes[0][3] : $attachment_id;
				$html .= bis_get_attachment_image( $maybe_alternative_attachment_id, [ $sizes[0][0], $sizes[0][1] ], isset( $sizes[0][2] ) ? $sizes[0][2] : false, $attr );
			}else{
				$html .= wp_get_attachment_image( $attachment_id, 'full', false, $attr );
			}
			$html .= '</picture>';
			return apply_filters( 'bis_get_attachment_picture', $html, $attachment_id, $sizes, $attr );
		}

		function retina_attribute( $attr, $attachment, $size, $crop ){
			if( isset( $attr['retina'] ) ){
				unset( $attr['retina'] );
				$imgx2 = bis_get_attachment_image_src( $attachment->ID, array( $size[0] * 2, $size[1] * 2 ), $crop );
				$attr['srcset'] = $attr['src'] . ' 1x, ' . $imgx2['src'] . ' 2x';
			}
			return $attr;
		}
	}

	new Better_image_sizes_resizer();
}

if( ! function_exists('bis_get_attachment_image_src') ){
	function bis_get_attachment_image_src( $attachment_id = 0, $size = '', $crop = null ){
		return (new Better_image_sizes_resizer)->get_attachment_image_src( $attachment_id, $size, $crop );
	}
}

if( ! function_exists('bis_get_attachment_image') ){
	function bis_get_attachment_image( $attachment_id = 0, $size = '', $crop = null, $attr = array() ){
		return (new Better_image_sizes_resizer)->get_attachment_image( $attachment_id, $size, $crop, $attr );
	}
}

if( ! function_exists('bis_get_attachment_picture') ){
	function bis_get_attachment_picture( $attachment_id = 0, $sizes = array(), $attr = array() ){
		return (new Better_image_sizes_resizer)->get_attachment_picture( $attachment_id, $sizes, $attr );
	}
}

// fallback for fly_ functions

if( ! function_exists('fly_get_attachment_image_src') ){
	function fly_get_attachment_image_src( $attachment_id = 0, $size = '', $crop = null ){
		return bis_get_attachment_image_src( $attachment_id, $size, $crop );
	}
}

if( ! function_exists('fly_get_attachment_image') ){
	function fly_get_attachment_image( $attachment_id = 0, $size = '', $crop = null, $attr = array() ){
		return bis_get_attachment_image( $attachment_id, $size, $crop, $attr );
	}
}