<?php

namespace ILJ\Core\Links;

use ILJ\Cache\Transient_Cache;

class Cache_Layer extends Layer {

	/**
	 * The post/term id.
	 *
	 * @var int $id
	 */
	protected $id;

	/**
	 * The resource type.
	 *
	 * @var string $type
	 */
	protected $type;

	/**
	 * Constructor for {@link Cache_Layer}
	 *
	 * @param int                              $id       The post/term id.
	 * @param string                           $type     The resource type.
	 * @param Text_To_Link_Converter_Interface $delegate The delegate.
	 */
	public function __construct($id, $type, $delegate) {
		$this->id = $id;
		$this->type = $type;
		parent::__construct($delegate);
	}


	/**
	 * Return the linked content.
	 *
	 * @param mixed $content The content value passed to cache link value into
	 * @return mixed 		 Mixed return value to cater different content compatibilities
	 */
	public function link_content($content) {
		$cached_content = Transient_Cache::get_cache_for_content($this->id, $this->type, $content);
		if ($cached_content) {
			return $cached_content;
		}
		$linked_content = $this->delegate->link_content($content);
		Transient_Cache::set_cache_for_content($this->id, $this->type, $content, $linked_content);
		return $linked_content;
	}
}