<?php
namespace Photonic_Plugin;

use stdClass;

/**
 * Class Photonic_Template
 * Used for cases where clicking on an album link opens a Photonic gallery on its own page. This is triggered when the shortcode attribute
 * <code>popup='page'</code> is set
 *
 * This functionality is work in progress and has not been tested. Hence this file is not loaded as a part of Photonic for now.
 *
 * @package Photonic_Plugin
 */
class Photonic_Template {
	public function __construct() {
		// Future functionality... will be added in the next version.
//		add_filter('the_posts', array($this, 'check_and_load_template'));
	}

	/**
	 * Internally registers pages we want to fake. Array key is the slug under which it is being available from the frontend
	 * @return mixed
	 */
	private static function get_fake_pages() {
		//http://example.com/fakepage1
		$fake_pages['photonic-gallery'] = array(
			'title'   => __('Photonic Gallery', 'photonic'),
			'content' => 'This is dummy content in a fake page'
		);
		return $fake_pages;
	}

	/**
	 * Fakes get posts result
	 *
	 * @param $posts
	 *
	 * @return array|null
	 */
	public function check_and_load_template($posts) {
		global $wp, $wp_query, $photonic_gallery_page;

		$fake_pages       = self::get_fake_pages();

		$gallery_page = strtolower($photonic_gallery_page);
		if ($gallery_page === strtolower($wp->request) ||
			(isset($wp->query_vars['page_id']) && strtolower($wp->query_vars['page_id']) === $gallery_page)) {
			$posts                  = null;
			$posts[]                = self::create_gallery_page($fake_pages[$gallery_page]);
			$wp_query->is_page      = true;
			$wp_query->is_singular  = true;
			$wp_query->is_home      = false;
			$wp_query->is_archive   = false;
			$wp_query->is_category  = false;
			$wp_query->photonic_template = $wp->request;
			//Longer permalink structures may not match the fake post slug and cause a 404 error so we catch the error here
			unset($wp_query->query["error"]);
			$wp_query->query_vars["error"] = "";
			$wp_query->is_404              = false;
		}

		return $posts;
	}

	/**
	 * Creates virtual fake page
	 *
	 * @param $page
	 *
	 * @return stdClass
	 */
	private static function create_gallery_page($page) {
		global $photonic_alternative_shortcode, $photonic_gallery_page;
		$gallery_page = strtolower($photonic_gallery_page);
		$shortcode_tag = $photonic_alternative_shortcode ?: 'gallery';
		$post                 = new stdClass;
		$post->post_author    = 1;
		$post->post_name      = $gallery_page;
		$post->guid           = get_bloginfo('wpurl') . '/' . $gallery_page;

		if (isset($_REQUEST['photonic_gallery'])) {
			$shortcode = $_REQUEST['photonic_gallery'];
			$shortcode = base64_decode($shortcode);

			// Input is coming via a URL, so we have to ensure it is safe.
			// The input is expected to be a Photonic shortcode, so the simplest way is to strip out all instances of the Photonic
			// shortcode and verify that the input is blank. If it is blank, then all that the input had was a Photonic shortcode.
			$content_without_shortcodes = strip_shortcodes($shortcode);
			if (!empty(trim($shortcode)) && has_shortcode($shortcode, $shortcode_tag) && empty(trim($content_without_shortcodes))) {
				// Looks good. Let's proceed.
				$post->post_title     = $page['title'];
				$post->post_content   = $shortcode;
			}
			else {
				// Input looks funny. Stay safe and exit
				$post->post_title     = esc_html__('Nothing found!', 'photonic');
				$post->post_content   = esc_html__('You are trying to display a gallery, but no gallery was found corresponding to the input.', 'photonic');
			}
		}
		else {
			// Input is blank. Show nothing and exit
			$post->post_title     = esc_html__('Nothing found!', 'photonic');
			$post->post_content   = esc_html__('You are trying to display a gallery, but no input was provided.', 'photonic');
		}

		$post->ID             = -1729; // Arbitrary number; picking Ramanujan's number :-)
		$post->post_status    = 'static';
		$post->comment_status = 'closed';
		$post->ping_status    = 'closed';
		$post->comment_count  = 0;
		$post->post_date      = current_time('mysql');
		$post->post_date_gmt  = current_time('mysql', 1);

		return $post;
	}
}

new Photonic_Template();