<?php
namespace Activitypub\Model;

use Activitypub\Transformer\Post as Post_Transformer;

/**
 * ActivityPub Post Class
 *
 * @author Matthias Pfefferle
 */
class Post {
	/**
	 * The \Activitypub\Activity\Base_Object object.
	 *
	 * @var \Activitypub\Activity\Base_Object
	 */
	protected $object;

	/**
	 * The WordPress Post Object.
	 *
	 * @var WP_Post
	 */
	private $post;

	/**
	 * Constructor
	 *
	 * @param WP_Post $post
	 * @param int     $post_author
	 */
	// phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed, VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
	public function __construct( $post, $post_author = null ) {
		_deprecated_function( __CLASS__, '1.0.0', '\Activitypub\Transformer\Post' );

		$this->post   = $post;
		$this->object = Post_Transformer::transform( $post )->to_object();
	}

	/**
	 * Returns the User ID.
	 *
	 * @return int the User ID.
	 */
	public function get_user_id() {
		return apply_filters( 'activitypub_post_user_id', $this->post->post_author, $this->post );
	}

	/**
	 * Converts this Object into an Array.
	 *
	 * @return array the array representation of a Post.
	 */
	public function to_array() {
		return \apply_filters( 'activitypub_post', $this->object->to_array(), $this->post );
	}

	/**
	 * Returns the Actor of this Object.
	 *
	 * @return string The URL of the Actor.
	 */
	public function get_actor() {
		$user = User_Factory::get_by_id( $this->get_user_id() );

		return $user->get_url();
	}

	/**
	 * Converts this Object into a JSON String
	 *
	 * @return string
	 */
	public function to_json() {
		return \wp_json_encode( $this->to_array(), \JSON_HEX_TAG | \JSON_HEX_AMP | \JSON_HEX_QUOT );
	}

	/**
	 * Returns the URL of an Activity Object
	 *
	 * @return string
	 */
	public function get_url() {
		return $this->object->get_url();
	}

	/**
	 * Returns the ID of an Activity Object
	 *
	 * @return string
	 */
	public function get_id() {
		return $this->object->get_id();
	}

	/**
	 * Returns a list of Image Attachments
	 *
	 * @return array
	 */
	public function get_attachments() {
		return $this->object->get_attachment();
	}

	/**
	 * Returns a list of Tags, used in the Post
	 *
	 * @return array
	 */
	public function get_tags() {
		return $this->object->get_tag();
	}

	public function get_replies() {
		if ( $this->replies ) {
			return $this->replies;
		}

		$replies = null;
		if ( $this->post->comment_count > 0 ) {
			$args = array(
				'post_id' => $this->post->ID,
				'hierarchical' => false,
				'status'       => 'approve',
			);
			$comments = \get_comments( $args );
			$items = array();

			foreach ( $comments as $comment ) {
				// include self replies
				if ( $this->post->post_author === $comment->user_id ) {
					$comment_url = \add_query_arg( //
						array(
							'p' => $this->post->ID,
							'replytocom' => $comment->comment_ID,
						),
						trailingslashit( site_url() )
					);
					$items[] = $comment_url;
				} else {
					$ap_object = \unserialize( \get_comment_meta( $comment->comment_ID, 'ap_object', true ) );
					$comment_url = \get_comment_meta( $comment->comment_ID, 'source_url', true );
					if ( ! empty( $comment_url ) ) {
						$items[] = \get_comment_meta( $comment->comment_ID, 'source_url', true );
					}
				}
			}

			$replies = (object) array(
				'type'  => 'Collection',
				'id'    => \add_query_arg( array( 'replies' => '' ), $this->id ),
				'first' => (object) array(
					'type'  => 'CollectionPage',
					'partOf' => \add_query_arg( array( 'replies' => '' ), $this->id ),
					'items' => $items,
				),
			);
		}

		$this->replies = $replies;

		return $replies;
	}

	/**
	 * Returns the as2 object-type for a given post
	 *
	 * @return string the object-type
	 */
	public function get_object_type() {
		return $this->object->get_type();
	}

	/**
	 * Returns the content for the ActivityPub Item.
	 *
	 * @return string the content
	 */
	public function get_content() {
		return $this->object->get_content();
	}

	/**
	 * Get deleted datetime
	 */
	public function get_deleted() {
		$post = $this->post;
		$deleted = null;
		if ( 'trash' === $post->post_status ) {
			$this->deleted = \gmdate( 'Y-m-d\TH:i:s\Z', \strtotime( $post->post_modified_gmt ) );
		}
		return $deleted;
	}
}