<?php

/**

 * Administration API: WP_Site_Icon class

 *

 * @package WordPress

 * @subpackage Administration

 * @since 4.3.0

 */

/**

 * Core class used to implement site icon functionality.

 *

 * @since 4.3.0

 */

class WP_Site_Icon {

	/**

	 * The minimum size of the site icon.

	 *

	 * @since 4.3.0

	 * @var int

	 */

	public $min_size = 512;

	/**

	 * The size to which to crop the image so that we can display it in the UI nicely.

	 *

	 * @since 4.3.0

	 * @var int

	 */

	public $page_crop = 512;

	/**

	 * List of site icon sizes.

	 *

	 * @since 4.3.0

	 * @var int[]

	 */

	public $site_icon_sizes = array(

		/*

		 * Square, medium sized tiles for IE11+.

		 *

		 * See https://msdn.microsoft.com/library/dn455106(v=vs.85).aspx

		 */

		270,

		/*

		 * App icon for Android/Chrome.

		 *

		 * @link https://developers.google.com/web/updates/2014/11/Support-for-theme-color-in-Chrome-39-for-Android

		 * @link https://developer.chrome.com/multidevice/android/installtohomescreen

		 */

		192,

		/*

		 * App icons up to iPhone 6 Plus.

		 *

		 * See https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html

		 */

		180,

		// Our regular Favicon.

		32,

	);

	/**

	 * Registers actions and filters.

	 *

	 * @since 4.3.0

	 */

	public function __construct() {

		add_action( 'delete_attachment', array( $this, 'delete_attachment_data' ) );

		add_filter( 'get_post_metadata', array( $this, 'get_post_metadata' ), 10, 4 );

	}

	/**

	 * Creates an attachment 'object'.

	 *

	 * @since 4.3.0

	 *

	 * @param string $cropped              Cropped image URL.

	 * @param int    $parent_attachment_id Attachment ID of parent image.

	 * @return array Attachment object.

	 */

	public function create_attachment_object( $cropped, $parent_attachment_id ) {

		$parent     = get_post( $parent_attachment_id );

		$parent_url = wp_get_attachment_url( $parent->ID );

		$url        = str_replace( wp_basename( $parent_url ), wp_basename( $cropped ), $parent_url );

		$size       = @getimagesize( $cropped );

		$image_type = ( $size ) ? $size['mime'] : 'image/jpeg';

		$object = array(

			'ID'             => $parent_attachment_id,

			'post_title'     => wp_basename( $cropped ),

			'post_content'   => $url,

			'post_mime_type' => $image_type,

			'guid'           => $url,

			'context'        => 'site-icon',

		);

		return $object;

	}

	/**

	 * Inserts an attachment.

	 *

	 * @since 4.3.0

	 *

	 * @param array  $object Attachment object.

	 * @param string $file   File path of the attached image.

	 * @return int           Attachment ID

	 */

	public function insert_attachment( $object, $file ) {

		$attachment_id = wp_insert_attachment( $object, $file );

		$metadata      = wp_generate_attachment_metadata( $attachment_id, $file );

		/**

		 * Filters the site icon attachment metadata.

		 *

		 * @since 4.3.0

		 *

		 * @see wp_generate_attachment_metadata()

		 *

		 * @param array $metadata Attachment metadata.

		 */

		$metadata = apply_filters( 'site_icon_attachment_metadata', $metadata );

		wp_update_attachment_metadata( $attachment_id, $metadata );

		return $attachment_id;

	}

	/**

	 * Adds additional sizes to be made when creating the site icon images.

	 *

	 * @since 4.3.0

	 *

	 * @param array[] $sizes Array of arrays containing information for additional sizes.

	 * @return array[] Array of arrays containing additional image sizes.

	 */

	public function additional_sizes( $sizes = array() ) {

		$only_crop_sizes = array();

		/**

		 * Filters the different dimensions that a site icon is saved in.

		 *

		 * @since 4.3.0

		 *

		 * @param int[] $site_icon_sizes Array of sizes available for the Site Icon.

		 */

		$this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );

		// Use a natural sort of numbers.

		natsort( $this->site_icon_sizes );

		$this->site_icon_sizes = array_reverse( $this->site_icon_sizes );

		// ensure that we only resize the image into

		foreach ( $sizes as $name => $size_array ) {

			if ( isset( $size_array['crop'] ) ) {

				$only_crop_sizes[ $name ] = $size_array;

			}

		}

		foreach ( $this->site_icon_sizes as $size ) {

			if ( $size < $this->min_size ) {

				$only_crop_sizes[ 'site_icon-' . $size ] = array(

					'width ' => $size,

					'height' => $size,

					'crop'   => true,

				);

			}

		}

		return $only_crop_sizes;

	}

	/**

	 * Adds Site Icon sizes to the array of image sizes on demand.

	 *

	 * @since 4.3.0

	 *

	 * @param string[] $sizes Array of image size names.

	 * @return string[] Array of image size names.

	 */

	public function intermediate_image_sizes( $sizes = array() ) {

		/** This filter is documented in wp-admin/includes/class-wp-site-icon.php */

		$this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );

		foreach ( $this->site_icon_sizes as $size ) {

			$sizes[] = 'site_icon-' . $size;

		}

		return $sizes;

	}

	/**

	 * Deletes the Site Icon when the image file is deleted.

	 *

	 * @since 4.3.0

	 *

	 * @param int $post_id Attachment ID.

	 */

	public function delete_attachment_data( $post_id ) {

		$site_icon_id = get_option( 'site_icon' );

		if ( $site_icon_id && $post_id == $site_icon_id ) {

			delete_option( 'site_icon' );

		}

	}

	/**

	 * Adds custom image sizes when meta data for an image is requested, that happens to be used as Site Icon.

	 *

	 * @since 4.3.0

	 *

	 * @param null|array|string $value    The value get_metadata() should return a single metadata value, or an

	 *                                    array of values.

	 * @param int               $post_id  Post ID.

	 * @param string            $meta_key Meta key.

	 * @param string|array      $single   Meta value, or an array of values.

	 * @return array|null|string The attachment metadata value, array of values, or null.

	 */

	public function get_post_metadata( $value, $post_id, $meta_key, $single ) {

		if ( $single && '_wp_attachment_backup_sizes' === $meta_key ) {

			$site_icon_id = get_option( 'site_icon' );

			if ( $post_id == $site_icon_id ) {

				add_filter( 'intermediate_image_sizes', array( $this, 'intermediate_image_sizes' ) );

			}

		}

		return $value;

	}

}