<?php
/**
 * @file wprest.php
 * @date 2018-03-14
 * @author Go Namhyeon <gnh1201@gmail.com>
 * @brief Wordpress Rest API helper
 */

if(!function_exists("get_wp_posts")) {
	function get_wp_posts($wp_server_url) {
		$results = array();

		$posts = parse_wp_posts($wp_server_url);
		$url_res = parse_url($wp_server_url);
		$origin = $url_res['host'];

		foreach($posts as $post) {
			$title = $post['title'];
			$content = $post['content'];
			$link = $post['link'];
			$object_id = $post['id'];

			$new_message = get_wp_new_message($title, $content, $link);
			$alt_message = get_wp_new_message($title, $content);

			$results[] = array(
				"origin"           => $origin,
				"title"            => $title,
				"content"          => $content,
				"link"             => $link,
				"message"          => $new_message,
				"alt_message"      => $alt_message,
				"object_id"        => $object_id,
				"hash_title"       => get_hashed_text($title),
				"hash_content"     => get_hashed_text($content),
				"hash_link"        => get_hashed_text($link),
				"hash_message"     => get_hashed_text($new_message),
				"hash_alt_message" => get_hashed_text($alt_message)
			);
		}

		return $results;
	}
}

if(!function_exists("parse_wp_posts")) {
	function parse_wp_posts($wp_server_url) {
		$rest_no_route = false;

		$posts = array();
		$results = array();

		$response = get_web_json($wp_server_url, "get", array(
			"rest_route" => "/wp/v2/posts/"
		));

		$code = get_value_in_object("code", $response);
		if($code === "rest_no_route") {
			$rest_no_route = true;
			$response = get_web_xml($wp_server_url, "get", array(
				"feed" => "rss2"
			));
		}

		if($rest_no_route === false) {
			$posts = $response;
			foreach($posts as $post) {		
				$results[] = array(
					"title" => get_clean_xss($post->title->rendered, 1),
					"content" => get_clean_xss($post->content->rendered, 1),
					"link" => get_clean_xss($post->guid->rendered, 1),
					"id" => $post->id,
				);
			}
		} else {
			$posts = $response->channel->item;
			foreach($posts as $post) {
				$post_link = get_clean_xss($post->link);
				$post_link_paths = array_filter(explode("/", $post_link), "strlen");
				$results[] = array(
					"title" => get_clean_xss($post->title),
					"content" => get_clean_xss($post->description),
					"link" => $post_link,
					"id" => end($post_link_paths),
				);
			}
		}

		return $results;
	}
}

if(!function_exists("get_wp_new_message")) {
	function get_wp_new_message($title, $content, $link="") {
		$new_message = "";

		$clean_title = get_clean_text($title);
		$clean_content = get_clean_text($content);
		$clean_llnk = get_clean_text($link);

		$message = $clean_title . " \n" . $clean_content;
		$words = explode(' ', $message);
		$words_choice = array_slice($words, 0, 30);
		$new_message = trim(implode(' ', $words_choice));

		if(!empty($clean_llnk)) {
			$new_message .= " " . $clean_llnk;
		}

		return $new_message;
	}
}