<?php
/**
 * Media library class.
 *
 * Responsible for displaying a UI (stats + action links) in the media library and the editor.
 *
 * @since 3.4.0
 * @package Smush\App
 */

namespace Smush\App;

use Smush\Core\Core;
use Smush\Core\Helper;
use Smush\Core\Modules\Abstract_Module;
use Smush\Core\Modules\Smush;
use Smush\Core\Error_Handler;
use WP_Post;
use WP_Query;
use WP_Smush;

/**
 * Class Media_Library
 */
class Media_Library extends Abstract_Module {

	/**
	 * Core instance.
	 *
	 * @var Core $core
	 */
	private $core;
	private $allowed_image_sizes;

	/**
	 * Media_Library constructor.
	 *
	 * @param Core $core  Core instance.
	 */
	public function __construct( Core $core ) {
		parent::__construct();
		$this->core = $core;
	}

	/**
	 * Init functionality that is related to the UI.
	 */
	public function init_ui() {
		// Media library columns.
		add_filter( 'manage_media_columns', array( $this, 'columns' ) );
		add_filter( 'manage_upload_sortable_columns', array( $this, 'sortable_column' ) );
		add_action( 'manage_media_custom_column', array( $this, 'custom_column' ), 10, 2 );

		// Manage column sorting.
		add_action( 'pre_get_posts', array( $this, 'smushit_orderby' ) );

		// Smush image filter from Media Library.
		add_filter( 'ajax_query_attachments_args', array( $this, 'filter_media_query' ) );
		// Smush image filter from Media Library (list view).
		add_action( 'restrict_manage_posts', array( $this, 'add_filter_dropdown' ) );

		// Add pre WordPress 5.0 compatibility.
		add_filter( 'wp_kses_allowed_html', array( $this, 'filter_html_attributes' ) );

		add_action( 'admin_enqueue_scripts', array( $this, 'extend_media_modal' ), 15 );

		add_filter( 'wp_prepare_attachment_for_js', array( $this, 'smush_send_status' ), 99, 3 );
	}

	/**
	 * Print column header for Smush results in the media library using the `manage_media_columns` hook.
	 *
	 * @param array $defaults  Defaults array.
	 *
	 * @return array
	 */
	public function columns( $defaults ) {
		$defaults['smushit'] = 'Smush';

		return $defaults;
	}

	/**
	 * Add the Smushit Column to sortable list
	 *
	 * @param array $columns  Columns array.
	 *
	 * @return array
	 */
	public function sortable_column( $columns ) {
		$columns['smushit'] = 'smushit';

		return $columns;
	}

	/**
	 * Print column data for Smush results in the media library using
	 * the `manage_media_custom_column` hook.
	 *
	 * @param string $column_name  Column name.
	 * @param int    $id           Attachment ID.
	 */
	public function custom_column( $column_name, $id ) {
		if ( 'smushit' === $column_name ) {
			$escaped_text = wp_kses_post( $this->generate_markup( $id ) );
			if ( $this->is_failed_processing_page() ) {
				$escaped_text = sprintf( '<div class="smush-failed-processing">%s</div>', $escaped_text );
			}
			echo $escaped_text;
		}
	}

	/**
	 * Detect failed processing page.
	 *
	 * @since 3.12.0
	 *
	 * @return boolean
	 */
	private function is_failed_processing_page() {
		static $is_failed_processing_page;
		if ( null === $is_failed_processing_page ) {
			$filter = filter_input( INPUT_GET, 'smush-filter', FILTER_SANITIZE_SPECIAL_CHARS );
			$is_failed_processing_page = 'failed_processing' === $filter;
		}
		return $is_failed_processing_page;
	}

	/**
	 * Order by query for smush columns.
	 *
	 * @param WP_Query $query  Query.
	 *
	 * @return WP_Query
	 */
	public function smushit_orderby( $query ) {
		global $current_screen;

		// Filter only media screen.
		if ( ! is_admin() || ( ! empty( $current_screen ) && 'upload' !== $current_screen->base ) ) {
			return $query;
		}

		$filter = filter_input( INPUT_GET, 'smush-filter', FILTER_SANITIZE_SPECIAL_CHARS );

		// Ignored.
		if ( 'ignored' === $filter ) {
			$query->set( 'meta_query', $this->query_ignored() );
			return $query;
		} elseif ( 'unsmushed' === $filter ) {
			// Not processed.
			$query->set( 'meta_query', $this->query_unsmushed() );
			return $query;
		} elseif ( 'failed_processing' === $filter ) {
			// Failed processing.
			$query->set( 'meta_query', $this->query_failed_processing() );
			return $query;
		}

		// TODO: do we need this?
		$orderby = $query->get( 'orderby' );

		if ( isset( $orderby ) && 'smushit' === $orderby ) {
			$query->set(
				'meta_query',
				array(
					'relation' => 'OR',
					array(
						'key'     => Smush::$smushed_meta_key,
						'compare' => 'EXISTS',
					),
					array(
						'key'     => Smush::$smushed_meta_key,
						'compare' => 'NOT EXISTS',
					),
				)
			);
			$query->set( 'orderby', 'meta_value_num' );
		}

		return $query;
	}

	/**
	 * Add our filter to the media query filter in Media Library.
	 *
	 * @since 2.9.0
	 *
	 * @see wp_ajax_query_attachments()
	 *
	 * @param array $query  Query.
	 *
	 * @return mixed
	 */
	public function filter_media_query( $query ) {
		$post_query = filter_input( INPUT_POST, 'query', FILTER_SANITIZE_SPECIAL_CHARS, FILTER_REQUIRE_ARRAY );

		if ( ! isset( $post_query['stats'] ) ) {
			return $query;
		}

		$filter_name = $post_query['stats'];

		// Excluded.
		if ( 'excluded' === $filter_name ) {
			$query['meta_query'] = $this->query_ignored();
		} elseif ( 'unsmushed' === $filter_name ) {
			// Unsmushed.
			$query['meta_query'] = $this->query_unsmushed();
		} elseif ( 'failed_processing' === $filter_name ) {
			// Failed processing.
			$query['meta_query'] = $this->query_failed_processing();
		}

		return $query;
	}

	/**
	 * Meta query for images skipped from bulk smush.
	 *
	 * @return array
	 */
	private function query_failed_processing() {
		$meta_query =  array(
			'relation' => 'AND',
			array(
				'key'     => Error_Handler::ERROR_KEY,
				'compare' => 'EXISTS',
			),
			array(
				'key'     => Error_Handler::IGNORE_KEY,
				'compare' => 'NOT EXISTS',
			),
		);

		if ( WP_Smush::is_pro() ) {
			$meta_query[] = array(
				'key'     => Error_Handler::ERROR_KEY,
				'value'   => 'size_limit',
				'compare' => '!=',
			);
		}

		return $meta_query;
	}

	/**
	 * Meta query for images skipped from bulk smush.
	 *
	 * @return array
	 */
	private function query_ignored() {
		return array(
			array(
				'key'     => 'wp-smush-ignore-bulk',
				'compare' => 'EXISTS',
			),
		);
	}

	/**
	 * Meta query for uncompressed images.
	 *
	 * @return array
	 */
	private function query_unsmushed() {
		return Core::get_unsmushed_meta_query();
	}

	/**
	 * Adds a search dropdown in Media Library list view to filter out images that have been
	 * ignored with bulk Smush.
	 *
	 * @since 3.2.0
	 */
	public function add_filter_dropdown() {
		$scr = get_current_screen();

		if ( 'upload' !== $scr->base ) {
			return;
		}

		$ignored = filter_input( INPUT_GET, 'smush-filter', FILTER_SANITIZE_SPECIAL_CHARS );

		?>
		<label for="smush_filter" class="screen-reader-text">
			<?php esc_html_e( 'Filter by Smush status', 'wp-smushit' ); ?>
		</label>
		<select class="smush-filters" name="smush-filter" id="smush_filter">
			<option value="" <?php selected( $ignored, '' ); ?>><?php esc_html_e( 'Smush: All images', 'wp-smushit' ); ?></option>
			<option value="unsmushed" <?php selected( $ignored, 'unsmushed' ); ?>><?php esc_html_e( 'Smush: Not processed', 'wp-smushit' ); ?></option>
			<option value="ignored" <?php selected( $ignored, 'ignored' ); ?>><?php esc_html_e( 'Smush: Bulk ignored', 'wp-smushit' ); ?></option>
			<option value="failed_processing" <?php selected( $ignored, 'failed_processing' ); ?>><?php esc_html_e( 'Smush: Failed Processing', 'wp-smushit' ); ?></option>
		</select>
		<?php
	}

	/**
	 * Data attributes are not allowed on <a> elements on WordPress before 5.0.0.
	 * Add backward compatibility.
	 *
	 * @since 3.5.0
	 * @see https://github.com/WordPress/WordPress/commit/a0309e80b6a4d805e4f230649be07b4bfb1a56a5#diff-a0e0d196dd71dde453474b0f791828fe
	 * @param array $context  Context.
	 *
	 * @return mixed
	 */
	public function filter_html_attributes( $context ) {
		global $wp_version;

		if ( version_compare( '5.0.0', $wp_version, '<' ) ) {
			return $context;
		}

		$context['a']['data-tooltip'] = true;
		$context['a']['data-id']      = true;
		$context['a']['data-nonce']   = true;

		return $context;
	}

	/**
	 * Load media assets.
	 *
	 * Localization also used in Gutenberg integration.
	 */
	public function extend_media_modal() {
		// Get current screen.
		$current_screen = get_current_screen();

		// Only run on required pages.
		if ( ! empty( $current_screen ) && ! in_array( $current_screen->id, Core::$external_pages, true ) && empty( $current_screen->is_block_editor ) ) {
			return;
		}

		if ( wp_script_is( 'smush-backbone-extension', 'enqueued' ) ) {
			return;
		}

		wp_enqueue_script(
			'smush-backbone-extension',
			WP_SMUSH_URL . 'app/assets/js/smush-media.min.js',
			array(
				'jquery',
				'media-editor', // Used in image filters.
				'media-views',
				'media-grid',
				'wp-util',
				'wp-api',
			),
			WP_SMUSH_VERSION,
			true
		);

		wp_localize_script(
			'smush-backbone-extension',
			'smush_vars',
			array(
				'strings' => array(
					'stats_label'          => esc_html__( 'Smush', 'wp-smushit' ),
					'filter_all'           => esc_html__( 'Smush: All images', 'wp-smushit' ),
					'filter_not_processed' => esc_html__( 'Smush: Not processed', 'wp-smushit' ),
					'filter_excl'          => esc_html__( 'Smush: Bulk ignored', 'wp-smushit' ),
					'filter_failed'        => esc_html__( 'Smush: Failed Processing', 'wp-smushit' ),
					'gb'                   => array(
						'stats'        => esc_html__( 'Smush Stats', 'wp-smushit' ),
						'select_image' => esc_html__( 'Select an image to view Smush stats.', 'wp-smushit' ),
						'size'         => esc_html__( 'Image size', 'wp-smushit' ),
						'savings'      => esc_html__( 'Savings', 'wp-smushit' ),
					),
				),
			)
		);
	}

	/**
	 * Send smush status for attachment.
	 *
	 * @param array   $response    Response array.
	 * @param WP_Post $attachment  Attachment object.
	 *
	 * @return mixed
	 */
	public function smush_send_status( $response, $attachment ) {
		if ( ! isset( $attachment->ID ) ) {
			return $response;
		}

		// Validate nonce.
		$status            = $this->smush_status( $attachment->ID );
		$response['smush'] = $status;

		return $response;
	}

	/**
	 * Get the smush button text for attachment.
	 *
	 * @param int $id  Attachment ID for which the Status has to be set.
	 *
	 * @return string
	 */
	private function smush_status( $id ) {
		$action = filter_input( INPUT_POST, 'action', FILTER_SANITIZE_SPECIAL_CHARS, FILTER_NULL_ON_FAILURE );

		// Show Temporary Status, For Async Optimisation, No Good workaround.
		if ( ! get_transient( 'wp-smush-restore-' . $id ) && 'upload-attachment' === $action && $this->settings->get( 'auto' ) ) {
			$status_txt = '<p class="smush-status">' . __( 'Smushing in progress...', 'wp-smushit' ) . '</p>';
			$button_txt = __( 'Smush Now!', 'wp-smushit' );

			return $this->column_html( $id, $status_txt, $button_txt, false );
		}

		// Else return the normal status.
		return trim( $this->generate_markup( $id ) );
	}

	/**
	 * Skip messages respective to their IDs.
	 *
	 * @param string $msg_id  Message ID.
	 *
	 * @return bool
	 */
	public function skip_reason( $msg_id ) {
		$count           = count( get_intermediate_image_sizes() );
		$smush_orgnl_txt = sprintf(
			/* translators: %s: number of thumbnails */
			esc_html__( 'When you upload an image to WordPress it automatically creates %s thumbnail sizes that are commonly used in your pages. WordPress also stores the original full-size image, but because these are not usually embedded on your site we don’t Smush them. Pro users can override this.', 'wp-smushit' ),
			$count
		);

		$skip_msg = array(
			'large_size' => $smush_orgnl_txt,
			'size_limit' => esc_html__( "Image couldn't be smushed as it exceeded the 5Mb size limit, Pro users can smush images without any size restriction.", 'wp-smushit' ),
		);

		$skip_rsn = '';
		if ( ! empty( $skip_msg[ $msg_id ] ) ) {
			$skip_rsn = '<a href="https://wpmudev.com/project/wp-smush-pro/?utm_source=smush&utm_medium=plugin&utm_campaign=smush_medialibrary_savings" target="_blank">
				<span class="sui-tooltip sui-tooltip-left sui-tooltip-constrained sui-tooltip-top-right-mobile" data-tooltip="' . $skip_msg[ $msg_id ] . '">
				<span class="sui-tag sui-tag-purple sui-tag-sm">' . esc_html__( 'PRO', 'wp-smushit' ) . '</span></span></a>';
		}

		return $skip_rsn;
	}

	/**
	 * Generate HTML for image status on the media library page.
	 *
	 * @since 3.5.0  Refactored from set_status().
	 *
	 * @param int $id  Attachment ID.
	 *
	 * @return string  HTML content or array of results.
	 */
	public function generate_markup( $id ) {
		// Don't proceed if attachment is not image, or if image is not a jpg, png or gif, or if is not found.
		$is_smushable = Helper::is_smushable( $id );
		$is_image_404 = false === $is_smushable;
		if ( ! $is_smushable && ! $is_image_404 && empty( $smush_data ) ) {
			return Error_Handler::get_error_message_for_media_library( 'not_processed' );
		}

		$smush_data      = get_post_meta( $id, Smush::$smushed_meta_key, true );
		$attachment_data = wp_get_attachment_metadata( $id );
		$error_code      = Error_Handler::get_error_code( $id );
		$error_class     = ! empty( $error_code ) ? ' smush-warning' : '';
		if ( Error_Handler::is_ignored( $id ) ) {
			$error_class .= ' smush-ignored';
		}

		$html = '<p class="smush-status' . $error_class . '">' . $this->get_optimization_status( $id, $smush_data ) . '</p>';

		// Need links, except the time that the image can't be optimized anymore.
		$links = $this->get_optimization_links( $id, $smush_data, $attachment_data );
		if ( ! empty( $links ) ) {
			$html .= '<div class="sui-smush-media smush-status-links">' . $links . '</div>';
		}

		// Attach the stats table.
		if ( isset( $smush_data['sizes'] ) ) {
			$html .= $this->get_detailed_stats( $id, $smush_data, $attachment_data );
		}

		return $html;
	}

	/**
	 * Get error message.
	 *
	 * @param int    $attachment_id Attachment ID.
	 * @param string $error_code Error code.
	 * @return null|string
	 */
	private function get_error_message( $attachment_id, $error_code = false ) {
		if ( ! empty( $error_code ) ) {
			return Error_Handler::get_error_message_for_media_library( $error_code, $attachment_id );
		}
		$is_ignored = Error_Handler::is_ignored( $attachment_id );
		$error_code = Error_Handler::get_error_code( $attachment_id );
		if ( $is_ignored ) {
			if ( Core::STATUS_ANIMATED === (int) $is_ignored || Error_Handler::ANIMATED_ERROR_CODE === $error_code ) {
				return Error_Handler::get_error_message_for_media_library( 'animated' );
			}

			return Error_Handler::get_error_message_for_media_library( 'ignored' );
		}
		if ( empty( $error_code ) ) {
			return;
		}
		return Error_Handler::get_error_message_for_media_library( $error_code, $attachment_id );
	}

	/**
	 * Get the image optimization status.
	 *
	 * Status                       Links                               Stats
	 * - Smushing in progress...    No buttons                          false
	 * - Already optimized          No buttons | Re-smush?              false
	 * - Ignored from auto-smush    Undo                                false
	 * - Not optimized              Smush | Ignore                      false
	 * - X images reduced by Y
	 *   Image size: Z              Re-smush? | View Stats | Restore?   true
	 *
	 * @param int         $id         Attachment ID.
	 * @param array       $smush_data Optimization data.
	 * @param null|string $error_code Error code.
	 *
	 * @return string
	 */
	private function get_optimization_status( $id, $smush_data, $error_code = null ) {
		if ( get_transient( 'smush-in-progress-' . $id ) ) {
			return Error_Handler::get_error_message_for_media_library( 'in_progress' );
		}

		$error_message = $this->get_error_message( $id );
		if ( $error_message ) {
			return $error_message;
		}

		if ( empty( $smush_data ) ) {
			return Error_Handler::get_error_message_for_media_library( 'not_processed' );
		}

		$stats = $this->core->get_stats_for_attachments( array( $id ) );

		if ( $stats['size_after'] === $stats['size_before'] ) {
			return __( 'Already optimized', 'wp-smushit' );
		}

		$percent = ( $stats['size_before'] - $stats['size_after'] ) / $stats['size_before'] * 100;

		if ( 1 < $stats['count_images'] ) {
			$status_text = sprintf( /* translators: %1$s: bytes savings, %2$s: percentage savings, %3$d: number of images */
				esc_html__( '%3$d images reduced by %1$s (%2$s)', 'wp-smushit' ),
				esc_html( size_format( $stats['size_before'] - $stats['size_after'], 1 ) ),
				sprintf( '%01.1f%%', number_format_i18n( $percent, 2 ) ),
				$stats['count_images']
			);
		} else {
			$status_text = sprintf( /* translators: %1$s: bytes savings, %2$s: percentage savings */
				esc_html__( 'Reduced by %1$s (%2$s)', 'wp-smushit' ),
				esc_html( size_format( $stats['size_before'] - $stats['size_after'], 1 ) ),
				sprintf( '%01.1f%%', number_format_i18n( $percent, 2 ) )
			);
		}

		$file_path = get_attached_file( $id );
		$size      = file_exists( $file_path ) ? filesize( $file_path ) : 0;
		if ( $size > 0 ) {
			/* translators: %1$s: new line, %2$s: image size */
			$status_text .= sprintf( __( '%1$sImage size: %2$s', 'wp-smushit' ), '<br />', size_format( $size, 1 ) );
		}

		return $status_text;
	}

	/**
	 * Get regenerate doc link.
	 *
	 * @since 3.12.0
	 *
	 * @return string
	 */
	private function get_regenerate_doc_link() {
		$doc = 'https://wpmudev.com/docs/wpmu-dev-plugins/smush/';
		if ( ! WP_Smush::is_pro() ) {
			$doc = 'https://wpmudev.com/docs/wpmu-dev-plugins/smush/?utm_source=smush&utm_medium=plugin&utm_campaign=smush_pluginlist_docs';
		}
		$doc .= '#restoring-images';
		return $doc;
	}

	/**
	 * Get revert link with utm links.
	 *
	 * @since 3.12.0
	 *
	 * @param int    $attachment_id Attachment ID.
	 * @param string $utm_link  Utm link.
	 *
	 * @return string
	 */
	private function get_revert_with_utm_links( $attachment_id, $utm_link = '' ) {
		$nonce      = wp_create_nonce( 'wp-smush-remove-skipped' );
		$links      = '';
		$class_name = 'wp-smush-remove-skipped';
		if ( ! empty( $utm_link ) ) {
			$links      .= $utm_link;
			$class_name .= ' smush-revert-utm';
		}
		$links .= "<a href='#' class='" . esc_attr( $class_name ) . "' data-id='{$attachment_id}' data-nonce='{$nonce}'>" . esc_html__( 'Revert back to previous state', 'wp-smushit' ) . '</a>';
		return $links;
	}

	/**
	 * Get ignore button with suggestion link for regeneration.
	 *
	 * @since 3.12.0
	 *
	 * @param int $attachment_id Attachment ID.
	 * @return string
	 */
	private function get_ignore_with_regenerate_links( $attachment_id ) {
		$links  = "<a target='_blank' href='" . esc_url( $this->get_regenerate_doc_link() ) . "' class='wp-smush-learnmore' data-id='{$attachment_id}'>" . esc_html__( 'Learn more', 'wp-smushit' ) . '</a>';
		$links .= ' | ';
		$links .= "<a href='#' class='smush-ignore-image' data-id='{$attachment_id}'>" . esc_html__( 'Ignore', 'wp-smushit' ) . '</a>';
		return $links;
	}

	/**
	 * Get ignore links and resmush or utm link.
	 *
	 * @since 3.12.0
	 *
	 * @param int    $attachment_id Attachment ID.
	 * @param string $utm_link  Utm link.
	 *
	 * @return string
	 */
	private function get_ignore_with_failed_links( $attachment_id, $utm_link = '' ) {
		$links      = '';
		$class_name = 'smush-ignore-image';
		if ( empty( $utm_link ) ) {
			$links  = self::get_resmsuh_link( $attachment_id );
			$links .= ' | ';
		} else {
			$links      .= $utm_link;
			$class_name .= ' smush-ignore-utm';
		}
		$links .= "<a href='#' class='" . esc_attr( $class_name ) . "' data-id='{$attachment_id}'>" . esc_html__( 'Ignore', 'wp-smushit' ) . '</a>';
		return $links;
	}

	/**
	 * Get not processed links.
	 *
	 * @since 3.12.0
	 *
	 * @param int $attachment_id Attachment ID.
	 *
	 * @return string
	 */
	private function get_not_processed_link( $attachment_id ) {
		$links  = "<a href='#' class='wp-smush-send' data-id='{$attachment_id}'>" . esc_html__( 'Smush', 'wp-smushit' ) . '</a>';
		$links .= ' | ';
		$links .= "<a href='#' class='smush-ignore-image' data-id='{$attachment_id}'>" . esc_html__( 'Ignore', 'wp-smushit' ) . '</a>';
		return $links;
	}

	/**
	 * Get optimization links. Possible values:
	 * - Smush
	 * - Ignore
	 * - View Stats
	 * - Restore
	 * - Undo
	 *
	 * @param int   $id               Attachment ID.
	 * @param array $smush_data       Optimization data.
	 * @param array $attachment_data  Attachment data.
	 *
	 * @return string
	 */
	public function get_optimization_links( $id, $smush_data = array(), $attachment_data = array() ) {
		if ( get_transient( 'smush-in-progress-' . $id ) ) {
			return '';
		}

		// Skipped.
		$is_ignored = Error_Handler::is_ignored( $id );
		$error_code = Error_Handler::get_error_code( $id );

		$utm_link = Error_Handler::get_utm_msg( $error_code );
		if ( $is_ignored ) {
			return $this->get_revert_with_utm_links( $id, $utm_link );
		}

		$show_restore_link    = $this->show_restore_option( $id, $attachment_data );
		$should_hide_doc_link = apply_filters( 'wpmudev_branding_hide_doc_link', false );
		$show_learn_more_link = ! $show_restore_link && ! $should_hide_doc_link;
		if ( Error_Handler::should_regenerate_thumbnail( $error_code ) && $show_learn_more_link ) {
			return $this->get_ignore_with_regenerate_links( $id );
		}

		if ( empty( $smush_data ) && ! empty( $error_code ) ) {
			// Failed too early, maybe it was a temporary issue that resmushing will fix.
			return $this->get_ignore_with_failed_links( $id, $utm_link );
		}

		// Not optimized.
		if ( empty( $smush_data ) ) {
			return $this->get_not_processed_link( $id );
		}

		$stats        = $this->core->get_stats_for_attachments( array( $id ) );
		$show_resmush = $this->show_resmush( $id, $smush_data, $attachment_data );

		// Already optimized, but needs a resumsh.
		if ( $stats['size_after'] === $stats['size_before'] && $show_resmush ) {
			return self::get_resmsuh_link( $id );
		}

		$links = $show_resmush ? self::get_resmsuh_link( $id ) : $this->get_super_smush_link( $id, $smush_data );

		// Show restore link only for images that had actual savings.
		if ( $stats['size_after'] !== $stats['size_before'] && $show_restore_link ) {
			$links .= empty( $links ) ? '' : ' | ';
			$links .= self::get_restore_link( $id );
		}

		// Detailed Stats Link.
		if ( $stats['size_after'] !== $stats['size_before'] ) {
			$links .= empty( $links ) ? '' : ' | ';
			$links .= sprintf(
				'<a href="#" class="wp-smush-action smush-stats-details wp-smush-title sui-tooltip sui-tooltip-top-right" data-tooltip="%s">%s</a>',
				esc_html__( 'Detailed stats for all the image sizes', 'wp-smushit' ),
				esc_html__( 'View Stats', 'wp-smushit' )
			);
		}

		return $links;
	}

	/**
	 * Checks the current settings and returns the value whether to enable or not the resmush option.
	 *
	 * @param string $id               Attachment ID.
	 * @param array  $wp_smush_data    Smush data.
	 * @param array  $attachment_data  Attachment data.
	 *
	 * @return bool
	 */
	private function show_resmush( $id = '', $wp_smush_data = array(), $attachment_data = array() ) {
		$resmush_ids = (array) get_option( 'wp-smush-resmush-list', array() );
		// If it's in resmushed lists, return.
		if ( in_array( $id, $resmush_ids ) ) {
			return true;
		}
		return $this->should_resmush( $id, $wp_smush_data, $attachment_data );
	}

	/**
	 * Checks the current settings and returns the value whether to should resmush the attachment or not.
	 *
	 * @param int   $attachment_id    Attachment ID.
	 * @param array $smush_data       Smush data.
	 * @param array $attachment_data  Attachment data.
	 *
	 * @since 3.10.3 Create a general method for re-using inside Ajax::scan_images()
	 *
	 * @return bool
	 */
	public function should_resmush( $attachment_id, $smush_data, $attachment_data = array() ) {
		// If skipped, returns.
		if ( ! apply_filters( 'wp_smush_image', true, $attachment_id ) ) {
			return false;
		}

		// If we need to optimise losslessly, add to resmush list.
		if ( $this->settings->get( 'lossy' ) && empty( $smush_data['stats']['lossy'] ) ) {
			return true;
		}

		// If we need to strip exif, put it in resmush list.
		if ( $this->settings->get( 'strip_exif' ) && isset( $smush_data['stats']['keep_exif'] ) && ( 1 === (int) $smush_data['stats']['keep_exif'] ) ) {
			return true;
		}

		if ( empty( $attachment_data ) ) {
			$attachment_data = wp_get_attachment_metadata( $attachment_id );
		}
		$attachment_sizes = empty( $attachment_data['sizes'] ) ? array() : $attachment_data['sizes'];

		$smushed_sizes = empty( $smush_data['sizes'] ) ? array() : $smush_data['sizes'];

		// If Original image needs to be smushed.
		if ( $this->settings->get( 'original' ) && WP_Smush::is_pro() && empty( $smushed_sizes['full'] ) ) {
			return true;
		}

		// Initially assume that we should not resmush.
		$should_resmush = false;

		// Get list of allowed image sizes.
		$allowed_image_sizes = $this->get_allowed_image_sizes();

		// unsmushed sizes = allowed sizes - smushed sizes
		$unsmushed_sizes = ! empty( $smushed_sizes ) && $allowed_image_sizes && is_array( $allowed_image_sizes )
			? array_diff_key( $allowed_image_sizes, $smushed_sizes )
			: false;

		// Support for WordPress.com hosting Site Accelerator.
		$has_photon_filter = has_filter( 'wp_image_editors', 'photon_subsizes_override_image_editors' );

		if ( $unsmushed_sizes && ! $has_photon_filter ) {
			$optimized_files = $this->get_optimized_image_files( $smushed_sizes, $attachment_sizes );

			foreach ( $unsmushed_sizes as $unsmushed_image_size => $unsmushed_size_data ) {
				if ( isset( $attachment_sizes[ $unsmushed_image_size ]['file'] ) ) {
					$maybe_unsmushed_file = $attachment_sizes[ $unsmushed_image_size ]['file'];
					if ( in_array( $maybe_unsmushed_file, $optimized_files, true ) ) {
						// Even though the size is unsmushed, the underlying file has already been smushed, so skip.
						continue;
					}
				}

				// If image has a size that can be compressed.
				if ( isset( $attachment_sizes[ $unsmushed_image_size ] ) ) {
					$should_resmush = true;
					break;
				}
			}
		}

		/**
		 * If the image needs to be resmushed add it to the list.
		 *
		 * @since 3.9.6 Add a filter to allow user handle resmush.
		 *
		 * @param bool  $should_resmush     Whether the image should resmush.
		 * @param int   $attachment         Attachment ID.
		 * @param array $smush_data         Smushed data.
		 *
		 * @hooked Smush\Core\Modules\Png2jpg::should_resmush() 9
		 * @hooked Smush\Core\Modules\Resize::should_resmush()  10
		 * @hooked Smush\Core\Modules\Webp::should_resmush()    10
		 */
		return apply_filters( 'wp_smush_should_resmush', $should_resmush, $attachment_id, $smush_data );
	}

	/**
	 * Get allowed image sizes.
	 *
	 * @return array
	 */
	private function get_allowed_image_sizes() {
		// Even with BP we do not scan multiple blogs in the same request, so cache it.
		if ( is_null( $this->allowed_image_sizes ) ) {
			$this->allowed_image_sizes = $this->prepare_allowed_image_sizes();
		}

		return $this->allowed_image_sizes;
	}

	private function prepare_allowed_image_sizes() {
		$image_sizes = $this->settings->get_setting( 'wp-smush-image_sizes' );

		if ( empty( $image_sizes ) ) {
			// Empty means we need to smush all images. So get all sizes of current site.
			$image_sizes = WP_Smush::get_instance()->core()->image_dimensions();
		} elseif ( is_array( $image_sizes ) ) {
			$image_sizes = array_flip( $image_sizes );
		} else {
			$image_sizes = array();
		}

		return $image_sizes;
	}

	/**
	 * Multiple attachment sizes can have the same underlying file.
	 * This method returns an array of file names that have been smushed already.
	 *
	 * @param $smushed_sizes
	 * @param $attachment_sizes
	 *
	 * @return array
	 */
	private function get_optimized_image_files( $smushed_sizes, $attachment_sizes ) {
		$optimized_files = array();
		foreach ( $smushed_sizes as $smushed_image_size => $image_stats ) {
			if ( isset( $attachment_sizes[ $smushed_image_size ]['file'] ) ) {
				$optimized_files[] = $attachment_sizes[ $smushed_image_size ]['file'];
			}
		}

		return $optimized_files;
	}

	/**
	 * If any of the image size have a backup file, show the restore option
	 *
	 * @param int          $image_id         Attachment ID.
	 * @param string|array $attachment_data  Attachment data.
	 *
	 * @return bool
	 */
	private function show_restore_option( $image_id, $attachment_data ) {
		// No Attachment data, don't go ahead.
		if ( empty( $attachment_data ) || ! $this->settings->get( 'backup' ) ) {
			return false;
		}

		return $this->core->mod->backup->backup_exists( $image_id );
	}

	/**
	 * Print the column html.
	 *
	 * @param string  $id           Media id.
	 * @param string  $html         Status text.
	 * @param string  $button_txt   Button label.
	 * @param boolean $show_button  Whether to shoe the button.
	 *
	 * @return string
	 */
	private function column_html( $id, $html = '', $button_txt = '', $show_button = true ) {
		// Don't proceed if attachment is not image, or if image is not a jpg, png or gif, or if is not found.
		$is_smushable = Helper::is_smushable( $id );
		if ( ! $is_smushable ) {
			return false === $is_smushable ? esc_html__( 'Image not found!', 'wp-smushit' ) : esc_html__( 'Not processed', 'wp-smushit' );
		}

		// If we aren't showing the button.
		if ( ! $show_button ) {
			return $html;
		}

		if ( 'Super-Smush' === $button_txt ) {
			$html .= ' | ';
		}

		$html .= "<a href='#' class='wp-smush-send' data-id='{$id}'>{$button_txt}</a>";

		if ( get_post_meta( $id, 'wp-smush-ignore-bulk', true ) ) {
			$nonce = wp_create_nonce( 'wp-smush-remove-skipped' );
			$html .= " | <a href='#' class='wp-smush-remove-skipped' data-id={$id} data-nonce={$nonce}>" . esc_html__( 'Show in bulk Smush', 'wp-smushit' ) . '</a>';
		} else {
			$html .= " | <a href='#' class='smush-ignore-image' data-id='{$id}'>" . esc_html__( 'Ignore', 'wp-smushit' ) . '</a>';
		}

		$html .= self::progress_bar();

		return $html;
	}

	/**
	 * Shows the image size and the compression for each of them
	 *
	 * @param int   $image_id             Attachment ID.
	 * @param array $wp_smush_data        Smush data array.
	 * @param array $attachment_metadata  Attachment metadata.
	 *
	 * @return string
	 */
	private function get_detailed_stats( $image_id, $wp_smush_data, $attachment_metadata ) {
		$stats      = '<div id="smush-stats-' . $image_id . '" class="sui-smush-media smush-stats-wrapper hidden">
			<table class="wp-smush-stats-holder">
				<thead>
					<tr>
						<th class="smush-stats-header">' . esc_html__( 'Image size', 'wp-smushit' ) . '</th>
						<th class="smush-stats-header">' . esc_html__( 'Savings', 'wp-smushit' ) . '</th>
					</tr>
				</thead>
				<tbody>';
		$size_stats = $wp_smush_data['sizes'];

		// Reorder Sizes as per the maximum savings.
		uasort(
			$size_stats,
			function( $a, $b ) {
				if ( $a->bytes === $b->bytes ) {
					return 0;
				}
				return $a->bytes < $b->bytes ? 1 : -1;
			}
		);

		if ( ! empty( $attachment_metadata['sizes'] ) ) {
			// Get skipped images.
			$skipped = $this->get_skipped_images( $image_id, $size_stats, $attachment_metadata );

			if ( ! empty( $skipped ) ) {
				foreach ( $skipped as $img_data ) {
					$skip_class = 'size_limit' === $img_data['reason'] ? ' error' : '';
					$stats     .= '<tr>
							<td>' . strtoupper( $img_data['size'] ) . '</td>
							<td class="smush-skipped' . $skip_class . '">' . $this->skip_reason( $img_data['reason'] ) . '</td>
						</tr>';
				}
			}
		}

		// Show Sizes and their compression.
		foreach ( $size_stats as $size_key => $size_value ) {
			$dimensions = '';
			// Get the dimensions for the image size if available.
			if ( ! empty( $attachment_metadata['sizes'] ) && ! empty( $attachment_metadata['sizes'][ $size_key ] ) ) {
				$dimensions = $attachment_metadata['sizes'][ $size_key ]['width'] . 'x' . $attachment_metadata['sizes'][ $size_key ]['height'];
			}
			$dimensions = ! empty( $dimensions ) ? sprintf( ' <br /> (%s)', $dimensions ) : '';
			if ( $size_value->bytes > 0 ) {
				$percent = round( $size_value->percent, 1 );
				$percent = $percent > 0 ? ' ( ' . $percent . '% )' : '';
				$stats  .= '<tr>
						<td>' . strtoupper( $size_key ) . $dimensions . '</td>
						<td>' . size_format( $size_value->bytes, 1 ) . $percent . '</td>
					</tr>';
			}
		}
		$stats .= '</tbody>
			</table>
		</div>';

		return $stats;
	}

	/**
	 * Return a list of images not smushed and reason
	 *
	 * @param int   $image_id             Attachment ID.
	 * @param array $size_stats           Stats array.
	 * @param array $attachment_metadata  Attachment metadata.
	 *
	 * @return array
	 */
	private function get_skipped_images( $image_id, $size_stats, $attachment_metadata ) {
		$skipped = array();

		// Get a list of all the sizes, Show skipped images.
		$media_size = get_intermediate_image_sizes();

		// Full size.
		$full_image = get_attached_file( $image_id );

		// If full image was not smushed, reason 1. Large Size logic, 2. Free and greater than 5Mb.
		if ( ! array_key_exists( 'full', $size_stats ) && ! WP_Smush::is_pro() ) {
			// For free version, Check the image size.
			$skipped[] = array(
				'size'   => 'full',
				'reason' => 'large_size',
			);

			// For free version, check if full size is greater than 5 Mb, show the skipped status.
			$file_size = file_exists( $full_image ) ? filesize( $full_image ) : '';
			if ( empty( $skipped ) && ! empty( $file_size ) && ( $file_size / WP_SMUSH_MAX_BYTES ) > 1 ) {
				$skipped[] = array(
					'size'   => 'full',
					'reason' => 'size_limit',
				);
			}
		}
		// For other sizes, check if the image was generated and not available in stats.
		if ( is_array( $media_size ) ) {
			foreach ( $media_size as $size ) {
				if ( array_key_exists( $size, $attachment_metadata['sizes'] ) && ! array_key_exists( $size, $size_stats ) && ! empty( $size['file'] ) ) {
					// Image Path.
					$img_path   = path_join( dirname( $full_image ), $size['file'] );
					$image_size = file_exists( $img_path ) ? filesize( $img_path ) : '';
					if ( ! empty( $image_size ) && ( $image_size / WP_SMUSH_MAX_BYTES ) > 1 ) {
						$skipped[] = array(
							'size'   => 'full',
							'reason' => 'size_limit',
						);
					}
				}
			}
		}

		return $skipped;
	}

	/**
	 * Returns the HTML for progress bar
	 *
	 * @return string
	 */
	public static function progress_bar() {
		return '<span class="spinner wp-smush-progress"></span>';
	}

	/**
	 * Generates a Resmush link for a image.
	 *
	 * @param int    $image_id  Attachment ID.
	 * @param string $type      Type of attachment.
	 *
	 * @return bool|string
	 */
	public static function get_resmsuh_link( $image_id, $type = 'wp' ) {
		if ( empty( $image_id ) ) {
			return false;
		}

		$class  = 'wp-smush-action wp-smush-title sui-tooltip sui-tooltip-constrained';
		$class .= 'wp' === $type ? ' wp-smush-resmush' : ' wp-smush-nextgen-resmush';

		return sprintf(
			'<a href="#" data-tooltip="%s" data-id="%d" data-nonce="%s" class="%s">%s</a>',
			esc_html__( 'Smush image including original file', 'wp-smushit' ),
			$image_id,
			wp_create_nonce( 'wp-smush-resmush-' . $image_id ),
			$class,
			esc_html__( 'Resmush', 'wp-smushit' )
		);
	}

	/**
	 * Returns a restore link for given image id
	 *
	 * @param int    $image_id  Attachment ID.
	 * @param string $type      Attachment type.
	 *
	 * @return bool|string
	 */
	public static function get_restore_link( $image_id, $type = 'wp' ) {
		if ( empty( $image_id ) ) {
			return false;
		}

		$class  = 'wp-smush-action wp-smush-title sui-tooltip';
		$class .= 'wp' === $type ? ' wp-smush-restore' : ' wp-smush-nextgen-restore';

		return sprintf(
			'<a href="#" data-tooltip="%s" data-id="%d" data-nonce="%s" class="%s">%s</a>',
			esc_html__( 'Restore original image', 'wp-smushit' ),
			$image_id,
			wp_create_nonce( 'wp-smush-restore-' . $image_id ),
			$class,
			esc_html__( 'Restore', 'wp-smushit' )
		);
	}

	/**
	 * Show super smush link.
	 *
	 * @since 3.4.0
	 *
	 * @param int   $id          Attachment ID.
	 * @param array $smush_data  Smush data array.
	 *
	 * @return string
	 */
	private function get_super_smush_link( $id, $smush_data ) {
		if ( empty( $smush_data['stats'] ) ) {
			return '';
		}

		// Image is already lossy.
		if ( isset( $smush_data['stats']['lossy'] ) && $smush_data['stats']['lossy'] ) {
			return '';
		}

		// Check if compression was lossless, and lossy compression is enabled.
		if ( ! $this->settings->get( 'lossy' ) || 'image/gif' === get_post_mime_type( $id ) ) {
			return '';
		}

		return "<a href='#' class='wp-smush-send' data-id='{$id}'>" . __( 'Super-Smush', 'wp-smushit' ) . '</a>';
	}

}