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<?php

namespace VSP\Modules;

defined( 'ABSPATH' ) || exit;

use VSP\Base;

/**
 * Class VSP_Shortcode
 *
 * @author Varun Sridharan <varunsridharan23@gmail.com>
 */
abstract class Shortcode extends Base {
    /**
     * Shortcode Name
     *
     * @var string
     */
    protected $name = '';

    /**
     * Shortcode Content
     *
     * @var null
     */
    protected $content = null;

    /**
     * Shortcode constructor.
     */
    public function __construct() {
        add_shortcode( $this->name, array( &$this, 'render_shortcode' ) );
    }

    /**
     * Function To Return Defaults Array.
     *
     * @return array
     */
    abstract protected function defaults();

    /**
     * Renders Shortcode.
     *
     * @param mixed  $atts .
     * @param string $content .
     *
     * @return mixed
     */
    public function render_shortcode( $atts, $content = '' ) {
        $this->settings = shortcode_atts( $this->defaults(), $atts, $this->name );
        $this->after_merge();
        $this->content = $content;
        return $this->output();
    }

    /**
     * Triggers Once $this->options isset.
     */
    protected function after_merge() {
    }

    /**
     * Hookable Function to render shortcode HTML.
     *
     * @return string
     */
    abstract protected function output();
}