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<?php

class CPAC_Storage_Model_Media extends CPAC_Storage_Model {

/**
	 * Constructor
	 *
	 * @since 2.0
	 */
	function __construct() {

$this->key 		 		= 'wp-media';
		$this->label 	 		= __( 'Media Library' );
		$this->singular_label 	= __( 'Media' );
		$this->type 	 		= 'media';
		$this->meta_type 		= 'post';
		$this->page 	 		= 'upload';
		$this->post_type 		= 'attachment';
		$this->menu_type 		= 'other';

// headings
        // Increased the priority to overrule 3th party plugins such as Media Tags
		add_filter( "manage_{$this->page}_columns",  array( $this, 'add_headings' ), 100 );

// values
		add_action( 'manage_media_custom_column', array( $this, 'manage_value' ), 100, 2 );

parent::__construct();
	}

/**
	 * Get WP default supported admin columns per post type.
	 *
	 * @since 1.0
	 *
	 * @return array
	 */
	public function get_default_columns() {

if ( ! function_exists('_get_list_table') ) {
			return array();
		}

// You can use this filter to add thirdparty columns by hooking into this.
		// See classes/third_party.php for an example.
		do_action( "cac/columns/default/storage_key={$this->key}" );

// get columns
		$table   = _get_list_table ( 'WP_Media_List_Table', array( 'screen' => 'upload' ) );
        $columns = (array) $table->get_columns();

if ( $this->is_settings_page() ) {
			$columns = array_merge( get_column_headers( 'upload' ), $columns );
		}

return $columns;
	}

/**
	 * Get original columns
	 *
	 * @since 2.4.4
	 */
	public function get_default_column_names() {
		return array( 'cb', 'date', 'parent', 'icon', 'title', 'author', 'comments' );
	}

/**
     * Get Meta
     *
	 * @since 2.0
	 *
	 * @return array
     */
    public function get_meta() {
        global $wpdb;
		return $wpdb->get_results( "SELECT DISTINCT meta_key FROM {$wpdb->postmeta} pm JOIN {$wpdb->posts} p ON pm.post_id = p.ID WHERE p.post_type = 'attachment' ORDER BY 1", ARRAY_N );
    }

/**
	 * Manage value
	 *
	 * @since 2.0
	 *
	 * @param string $column_name
	 * @param int $post_id
	 */
	public function manage_value( $column_name, $media_id ) {

if ( ! ( $column = $this->get_column_by_name( $column_name ) ) ) {
			return false;
		}

$value = $column->get_value( $media_id );

// add hook
		$value = apply_filters( "cac/column/value", $value, $media_id, $column, $this->key );
		$value = apply_filters( "cac/column/value/{$this->type}", $value, $media_id, $column, $this->key );

echo $value;
	}

}