<?php
/**
 * @author    ThemePunch <info@themepunch.com>
 * @link      https://www.themepunch.com/
 * @copyright 2024 ThemePunch
 */

if( !defined( 'ABSPATH') ) exit();

class RevSliderPageTemplate {

	/**
	 * A reference to an instance of this class.
	 */
	private static $instance;

	/**
	 * The array of templates that this plugin tracks.
	 */
	protected $templates;

	/**
	 * Returns an instance of this class. 
	 */
	public static function get_instance(){

		if(null == self::$instance) self::$instance = new RevSliderPageTemplate();
		
		return self::$instance;
	} 

	/**
	 * Initializes the plugin by setting filters and administration functions.
	 */
	private function __construct(){

		$this->templates = array();

		// Add a filter to the attributes metabox to inject template into the cache.
		add_filter('page_attributes_dropdown_pages_args', array( $this, 'register_project_templates'));

		// Add a filter to the save post to inject out template into the page cache
		add_filter('wp_insert_post_data', array($this, 'register_project_templates'));

		// Add a filter to the template include to determine if the page has our 
		// template assigned and return it's path
		add_filter('template_include', array($this, 'view_project_template'));

		// Add your templates to this array.
		$this->templates = array('../public/views/revslider-page-template.php' => 'Slider Revolution Blank Template');
		
		// Fix for WP 4.7
		add_filter('theme_page_templates', array($this, 'register_project_templates_new'));

		// Add filters to the attributes metabox to inject templates to all posts
		$types = get_post_types([], 'objects');
		foreach($types as $type => $values){
			if(isset($type)) add_filter('theme_' . $type . '_templates', array($this, 'add_post_templates'));
		}
	} 


	// Adds our template to the new post templates setting (WP >= 4.7)
	public function register_project_templates_new($post_templates){
	    return array_merge($post_templates, $this->templates);
	}


	public function  add_post_templates($templates){
		$my_virtual_templates = array('../public/views/revslider-page-template.php' => 'Slider Revolution Blank Template');

		return array_merge($templates, $my_virtual_templates);
	}


	/**
	 * Adds our template to the pages cache in order to trick WordPress
	 * into thinking the template file exists where it doens't really exist.
	 *
	 */

	public function register_project_templates($atts){

		// Create the key used for the themes cache
		$cache_key = 'page_templates-' . md5(get_theme_root() . '/' . get_stylesheet());

		// Retrieve the cache list. 
		// If it doesn't exist, or it's empty prepare an array
		$templates = wp_get_theme()->get_page_templates();

		if(empty($templates)) $templates = array();

		// New cache, therefore remove the old one
		wp_cache_delete($cache_key , 'themes');

		// Now add our template to the list of templates by merging our templates
		// with the existing templates array from the cache.
		$templates = array_merge($templates, $this->templates);

		// Add the modified cache to allow WordPress to pick it up for listing
		// available templates
		wp_cache_add($cache_key, $templates, 'themes', 1800);

		return $atts;
	} 

	/**
	 * Checks if the template is assigned to the page
	 */
	public function view_project_template($template){

		if(is_search()) return $template; //fix for search issue (B-5798177839)

		global $post;
		
		if(!isset($post->ID)) return $template;
			
		if(!isset($this->templates[get_post_meta( 
			$post->ID, '_wp_page_template', true 
		)])){
			return $template;
		} 

		$file = plugin_dir_path(__FILE__). get_post_meta($post->ID, '_wp_page_template', true);
		
		// Just to be safe, we check if the file exist first
		if(file_exists($file)){
			return $file;
		}else{
			echo $file;
		}

		return $template;
	}
}