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<?php

class WP_Site_Icon
{
    public $min_size = 512;
    public $page_crop = 512;
    public $site_icon_sizes = array(270, 192, 180, 32);
    public function __construct()
    {
        add_action('delete_attachment', array($this, 'delete_attachment_data'));
        add_filter('get_post_metadata', array($this, 'get_post_metadata'), 10, 4);
    }
    public function create_attachment_object($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);
        $size = wp_getimagesize($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 $object;
    }
    public function insert_attachment($object, $file)
    {
        $attachment_id = wp_insert_attachment($object, $file);
        $metadata = wp_generate_attachment_metadata($attachment_id, $file);
        $metadata = apply_filters('site_icon_attachment_metadata', $metadata);
        wp_update_attachment_metadata($attachment_id, $metadata);
        return $attachment_id;
    }
    public function additional_sizes($sizes = array())
    {
        $only_crop_sizes = array();
        $this->site_icon_sizes = apply_filters('site_icon_image_sizes', $this->site_icon_sizes);
        natsort($this->site_icon_sizes);
        $this->site_icon_sizes = array_reverse($this->site_icon_sizes);
        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 $only_crop_sizes;
    }
    public function intermediate_image_sizes($sizes = array())
    {
        $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 $sizes;
    }
    public function delete_attachment_data($post_id)
    {
        $site_icon_id = get_option('site_icon');
        if ($site_icon_id && $post_id == $site_icon_id) {
            delete_option('site_icon');
        }
    }
    public function get_post_metadata($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;
    }
}