<?php
/**
 * Form: Preview
 *
 * @package SimplePay\Core\Forms
 * @copyright Copyright (c) 2020, Sandhills Development, LLC
 * @license http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since 3.0.0
 */

namespace SimplePay\Core\Forms;

/**
 * Preview class.
 *
 * @since 3.0.0
 */
class Preview {

	/**
	 * Payment Form ID.
	 *
	 * @var null|int|string
	 * @since 3.0.0
	 */
	public $preview_form_id = null;

	/**
	 * Preview constructor.
	 */
	public function __construct() {

		$this->preview_form_id = absint( $_GET['simpay-preview'] );

		if ( empty( $this->preview_form_id ) ) {
			return;
		}

		add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) );

		add_filter( 'the_title', array( $this, 'the_title' ) );
		remove_filter( 'the_content', 'wpautop' );
		remove_filter( 'the_excerpt', 'wpautop' );
		add_filter( 'the_content', array( $this, 'the_content' ) );
		add_filter( 'get_the_excerpt', array( $this, 'the_content' ) );
		add_filter( 'template_include', array( $this, 'template_include' ) );
		add_filter( 'post_thumbnail_html', array( $this, 'post_thumbnail_html' ) );
	}

	/**
	 * Since we know we are on a preview page we set the posts_per_page to show only 1 (ours).
	 *
	 * @param \WP_Query $query Current WordPress query.
	 */
	public function pre_get_posts( $query ) {
		$query->set( 'posts_per_page', 1 );
	}

	/**
	 * Change the title of our preview page.
	 *
	 * @param string $title Post title.
	 * @return string
	 */
	public function the_title( $title ) {
		if ( ! in_the_loop() ) {
			return $title;
		}

		return __( 'Simple Pay Preview', 'simple-pay' );
	}

	/**
	 * Rewrite the_content to output our form preview shortcode.
	 *
	 * @param string $content Post content.
	 * @return string
	 */
	public function the_content( $content ) {
		if ( ! is_user_logged_in() ) {
			return __( 'You must be logged in to preview a form.', 'simple-pay' );
		}

		if ( in_the_loop() ) {
			return do_shortcode( '[simpay_preview id="' . absint( $this->preview_form_id ) . '"]' );
		}

		return $content;
	}

	/**
	 * Search for these templates so we can show preview within the theme.
	 *
	 * @return string
	 */
	public function template_include() {
		return locate_template( array( 'page.php', 'single.php', 'index.php' ) );
	}

	/**
	 * Hide any post thumbnails
	 *
	 * @return string
	 */
	public function post_thumbnail_html() {
		return '';
	}
}