<?php
/**
 * ActivityPub Post Class
 *
 * @author Matthias Pfefferle
 */
class Activitypub_Post {
	private $post;

	public function __construct( $post = null ) {
		if ( ! $post ) {
			$post = get_post();
		}

		$this->post = $post;
	}

	public function to_json_array( $with_context = false ) {
		$post = $this->post;

		$json = new stdClass();

		if ( $with_context ) {
			$json->{'@context'} = get_activitypub_context();
		}

		$json->published = date( 'Y-m-d\TH:i:s\Z', strtotime( $post->post_date ) );
		$json->id = $post->guid . '&activitypub';
		$json->type = 'Create';
		$json->actor = get_author_posts_url( $post->post_author );
		$json->to = array( 'https://www.w3.org/ns/activitystreams#Public' );
		$json->cc = array( 'https://www.w3.org/ns/activitystreams#Public' );

		$json->object = array(
			'id' => $post->guid,
			'type' => $this->get_object_type(),
			'published' => date( 'Y-m-d\TH:i:s\Z', strtotime( $post->post_date ) ),
			'to' => array( 'https://www.w3.org/ns/activitystreams#Public' ),
			'cc' => array( 'https://www.w3.org/ns/activitystreams#Public' ),
			'attributedTo' => get_author_posts_url( $post->post_author ),
			'summary' => null,
			'inReplyTo' => null,
			'content' => esc_html( $post->post_content ),
			'contentMap' => array(
				strstr( get_locale(), '_', true ) => esc_html( $post->post_content )	,
			),
			'attachment' => array(),
			'tag' => array(),
		);

		return apply_filters( 'activitypub_json_post', $json );
	}

	/**
	 * Returns the as2 object-type for a given post
	 *
	 * @param string $type the object-type
	 * @param Object $post the post-object
	 *
	 * @return string the object-type
	 */
	public function get_object_type() {
		$post_type = get_post_type( $this->post );
		switch ( $post_type ) {
			case 'post':
				$post_format = get_post_format( $this->post );
				switch ( $post_format ) {
					case 'aside':
					case 'status':
					case 'quote':
					case 'note':
						$object_type = 'Note';
						break;
					case 'gallery':
					case 'image':
						$object_type = 'Image';
						break;
					case 'video':
						$object_type = 'Video';
						break;
					case 'audio':
						$object_type = 'Audio';
						break;
					default:
						$object_type = 'Article';
						break;
				}
				break;
			case 'page':
				$object_type = 'Page';
				break;
			case 'attachment':
				$mime_type = get_post_mime_type();
				$media_type = preg_replace( '/(\/[a-zA-Z]+)/i', '', $mime_type );
				switch ( $media_type ) {
					case 'audio':
						$object_type = 'Audio';
						break;
					case 'video':
						$object_type = 'Video';
						break;
					case 'image':
						$object_type = 'Image';
						break;
				}
				break;
			default:
				$object_type = 'Article';
				break;
		}

		return $object_type;
	}
}