<?php

// REMOVE DUPLICATE IMAGES
function print_duplicated_image_box( $post ) {
  wp_nonce_field( 'remove_duplicated_nonce_action', 'remove_duplicated_nonce' ); ?>
	<script type="text/javascript">
	jQuery(document).ready(function($){
		$('#scan-images-duplicated, #delete-images-duplicated').click(function(e){
			e.preventDefault();
			var order = $(this).hasClass('scanimages') ? 'scan' : 'delete_all',
				p_data = {
					action: 'galleryduplicate',
					command: order,
					postID: $('#post_ID').val(),
					rd_nonce: $('#remove_duplicated_nonce').val()
				},
				spinner = order == 'scan' ? $('#remove-duplicated-box .spinner:eq(0)'):$('#remove-duplicated-box .spinner:eq(1)');
			spinner.show();
			$.ajax({ url: ajaxurl+'?r='+Math.random(), data: p_data,
				success: function(content){
					if(order == 'scan'){
						$('#duplicate-image-result').html(content).css('visibility','visible');
					} else {
						$('#duplicate-notification').html(content).css('visibility','visible');
						setTimeout(function(){
							$('#duplicate-image-result').animate({height: 0}, 500, function(){$(this).empty().css('height','auto');});
							$('#duplicate-notification').empty().css({'visibility':'hidden'});
						},3000)
					}
					spinner.hide();
				}
			});
		});
		$('body').on('click', '.delete-attachment', function(e){
			e.preventDefault();
			var deleted = $(this),
				p_data = {
					action: 'galleryduplicate',
					command: 'delete',
					imageid: deleted.attr('id'),
					postID: $('#post_ID').val(),
					rd_nonce: $('#remove_duplicated_nonce').val()
				};
			$('#remove-duplicated-box .spinner:eq(0)').show();
			$.ajax({ url: ajaxurl+'?r='+Math.random(), data: p_data,
				success: function(data){
					if(data == 'success'){
						deleted.parent().remove();
					$('#remove-duplicated-box .spinner:eq(0)').hide();
					}
				}
			});
		})
	});
	</script>
	<div class="submitbox" id="remove-duplicated-box" style="padding: 10px 0 0;clear: both;border-top: 1px solid whiteSmoke;margin-top: -2px;">
		<input type="submit" class="button scanimages" id="scan-images-duplicated" value="Scan for Duplicate Images" style="float:right">
		<span class="spinner" style="display: none;"></span>
		<div id="duplicate-image-result" style="visibility: hidden; margin: 5px 0 10px; clear:both; float:left"></div>
		<div class="clear" style="border-top: 1px solid #D9D9D9; border-bottom: 1px solid #fff; margin-bottom: 20px;"></div>
		<input type="submit" class="button button-primary button-large" id="delete-images-duplicated" value="Delete Old Duplicate Images" style="float:right">
		<span class="spinner" style="display: none;"></span>
		<p id="duplicate-notification" style="visibility: hidden; height: 1em; margin: 0; padding: 5px 0; text-align: right; clear:both"></p>
	</div>
<?php
}
// add our custom box
function my_duplicated_box() {
    $posttype = array('page','individual');
    foreach ($posttype as $type) {
        add_meta_box(
            'check_image_duplication',
            __( 'Remove Duplicate Images'),
            'print_duplicated_image_box',
            $type,
			'side',
			'core'
        );
    }
}
add_action( 'add_meta_boxes', 'my_duplicated_box' );

function rename_latest_file($ID, $new_name, $postID){
    $file = get_attached_file($ID);
    $path = pathinfo($file);
    $newfile = $path['dirname']."/".$new_name;

    rename($file, $newfile);
    // update_attached_file( $ID, $newfile );

	$wp_filetype = wp_check_filetype(basename($newfile), null );
	$wp_upload_dir = wp_upload_dir();
	$attachment = array(
		'guid' => $wp_upload_dir['url'] . '/' . basename( $newfile ),
		'post_mime_type' => $wp_filetype['type'],
		'post_title' => preg_replace('/\.[^.]+$/', '', basename($newfile)),
		'post_content' => '',
		'post_status' => 'inherit'
	);

	$attach_id = wp_insert_attachment( $attachment, $newfile, $postID );

	require_once(ABSPATH . 'wp-admin/includes/image.php');
	$attach_data = wp_generate_attachment_metadata( $attach_id, $newfile );
	wp_update_attachment_metadata( $attach_id, $attach_data );

	wp_delete_attachment( $ID, false );
}
/* check image gallery duplicate function */
function check_gallery_duplication(){
	if(!wp_verify_nonce( $_GET['rd_nonce'],  'remove_duplicated_nonce_action' ))
		die;

	$postID = $_GET['postID'];
	$command = $_GET['command'];

	$originalname = $imagedata = $similar = $latestID = $duplicate = array();
	$attachments = get_children( array('post_parent' => $postID, 'post_type' => 'attachment', 'post_mime_type' =>'image', 'orderby' => 'post_date') );

	// get all original name
	foreach($attachments as $image){
		if(!in_array( $image->post_title,$originalname ))
			$originalname[] = $image->post_title;
	}

	foreach($attachments as $image){
		$filename = basename(wp_get_attachment_url($image->ID));
		foreach($originalname as $key){
			preg_match('/'.$key.'.(jpg|png|gif)/i', $filename, $ori);
			if(!empty($ori)){
				$imagedata[$key.'.'.$ori[1]][] = array('value' => 0, 'extension' => $ori[1], 'filename' => $filename, 'ID' => $image->ID );
				$similar[$key.'.'.$ori[1]][] = 0;
			} else {
				preg_match('/'.$key.'(\d+).(jpg|png|gif)/i', $filename, $rev);
				if(!empty($rev)){
					$imagedata[$key.'.'.$rev[2]][] = array('value' => (int) $rev[1], 'extension' => $rev[2], 'filename' => $filename, 'ID' => $image->ID);
					$similar[$key.'.'.$rev[2]][] = $rev[1];
				}
			}
		}
	}
	// return only previous image, not latest (largest number of image identifier)
	foreach($imagedata as $key => $image){
		$latest = max($similar[$key]);
		foreach($image as $data){
			if($data['value'] != $latest)
				$duplicate[$key][] = array( 'ID' => $data['ID'], 'filename' => $data['filename'] );
			else
				$latestID[$key] = $data['ID'];
		}
	}

	if($command == 'scan'){
		if(!empty($duplicate)){
			foreach($duplicate as $key => $result){
				echo '<p>'.$key.' <br/><strong>'.count($result).' Duplicates</strong> <a id="'.$key.'" class="delete-attachment" href="#">Delete</a></p>';
			}
		} else {
			echo '<p>No Duplicated Images found </p>';
		}
	} elseif($command == 'delete'){
		if(!empty($duplicate)){
			$image_name = $_GET['imageid'];
			foreach($duplicate[$image_name] as $image){
				wp_delete_attachment( $image['ID'], false );
			}
			rename_latest_file( $latestID[$image_name], $image_name, $postID);
			echo 'success';
		}
	} else if($command == 'delete_all'){
		foreach($duplicate as $key => $data){
			foreach($data as $image){
				wp_delete_attachment( $image['ID'], false );
			}
			rename_latest_file( $latestID[$key], $key, $postID);
		}
		echo 'Images succesfully deleted!';
	}

	die;
}
add_action('wp_ajax_galleryduplicate', 'check_gallery_duplication');

?>