<?php
/**
 * Shortcode handler for Aha Prev Next.
 *
 * @package AHA_Prev_Next
 * @since 0.1.0
 */

if ( ! defined( 'WPINC' ) ) {
	die;
}

class AHA_Prev_Next_Shortcode {

	/** @var AHA_Prev_Next_Shortcode */
	private static $instance = null;

	/** @return AHA_Prev_Next_Shortcode */
	public static function get_instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function __construct() {
		add_shortcode( 'aha_prev_next', array( $this, 'render_shortcode' ) );
	}

	/**
	 * Render shortcode output.
	 *
	 * @param array|string $atts Shortcode attributes.
	 * @return string
	 */
	public function render_shortcode( $atts ) {
		if ( ! function_exists( 'aha_prev_next_is_enabled' ) || ! aha_prev_next_is_enabled() ) {
			return '';
		}
		if ( ! class_exists( 'AHA_Prev_Next_Renderer' ) ) {
			return '';
		}

		$atts = shortcode_atts(
			array(
				'position'      => '', // above|below (optional override).
				'show_thumbnail'=> '', // 1|0
				'title_length'  => '', // int
			),
			is_array( $atts ) ? $atts : array(),
			'aha_prev_next'
		);

		$args = array();
		if ( in_array( $atts['position'], array( 'above', 'below' ), true ) ) {
			$args['position'] = $atts['position'];
		}
		if ( '' !== $atts['show_thumbnail'] ) {
			$args['show_thumbnail'] = (int) (bool) ( '0' !== (string) $atts['show_thumbnail'] );
		}
		if ( '' !== $atts['title_length'] && is_numeric( $atts['title_length'] ) ) {
			$len = absint( $atts['title_length'] );
			$args['title_length'] = ( 0 === $len ) ? 0 : max( 10, min( 120, $len ) );
		}

		return AHA_Prev_Next_Renderer::get_instance()->render( $args );
	}
}