<?php
/**
 * @package CleverOgre
 * @subpackage OgreIssuu
 * @version 0.1.0
 * @since 0.1.0
 */

namespace OgreIssuu\Shortcodes;

defined('ABSPATH') || exit;

use OgreIssuu\Singleton;

abstract class Shortcode {
    use Singleton;

    public function __construct() {
        $this->register();
    }

    protected function get_tag():string {
        $parts = explode('\\', get_called_class());
        return sanitize_key(preg_replace('/([a-z])([A-Z])/', '$1-$2', array_pop($parts)));
    }

    protected function register():void {
        add_shortcode($this->get_tag(), [$this, 'callback']);
    }
    
    public function get_default_attributes():array {
        return [];
    }

    public function get_attributes(array $atts = []):array {
        return shortcode_atts($this->get_default_attributes(), $atts, $this->get_tag());
    }

    public function callback(array $atts, ?string $content = null) {
        ob_start();
        $this->render($this->get_attributes($atts), (!is_null($content) ? $content : ''));
        return ob_get_clean();
    }

    public abstract function render(array $atts, string $content):void;

}