<?php
namespace Activitypub\Transformer;

use WP_Post;
use Activitypub\Collection\Users;
use Activitypub\Model\Blog_User;
use Activitypub\Activity\Base_Object;
use Activitypub\Shortcodes;
use Activitypub\Transformer\Base;

use function Activitypub\esc_hashtag;
use function Activitypub\is_single_user;
use function Activitypub\get_rest_url_by_path;
use function Activitypub\site_supports_blocks;

/**
 * WordPress Post Transformer
 * The Post Transformer is responsible for transforming a WP_Post object into different othe
 * Object-Types.
 *
 * Currently supported are:
 * - Activitypub\Activity\Base_Object
 */
class Post extends Base {
	/**
	 * Getter function for the name of the transformer.
	 *
	 * @return string name
	 */
	public function get_name() {
		return 'activitypub/default';
	}

	/**
	 * Getter function for the display name (label/title) of the transformer.
	 *
	 * @return string name
	 */
	public function get_label() {
		return 'Built-In';
	}

	/**
	 * Returns the ActivityStreams 2.0 Object-Type for a Post based on the
	 * settings and the Post-Type.
	 *
	 * @see https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
	 *
	 * @return string The Object-Type.
	 */
	protected function get_object_type() {
		if ( 'wordpress-post-format' !== \get_option( 'activitypub_object_type', 'note' ) ) {
			return \ucfirst( \get_option( 'activitypub_object_type', 'note' ) );
		}

		// Default to Article.
		$object_type = 'Article';
		$post_type   = \get_post_type( $this->wp_post );
		switch ( $post_type ) {
			case 'post':
				$post_format = \get_post_format( $this->wp_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;
	}

	/**
	 * Gets the template to use to generate the content of the activitypub item.
	 *
	 * @return string The Template.
	 */
	protected function get_post_content_template() {
		$type = \get_option( 'activitypub_post_content_type', 'content' );

		switch ( $type ) {
			case 'excerpt':
				$template = "[ap_excerpt]\n\n[ap_permalink type=\"html\"]";
				break;
			case 'title':
				$template = "[ap_title]\n\n[ap_permalink type=\"html\"]";
				break;
			case 'content':
				$template = "[ap_content]\n\n[ap_permalink type=\"html\"]\n\n[ap_hashtags]";
				break;
			default:
				$template = \get_option( 'activitypub_custom_post_content', ACTIVITYPUB_CUSTOM_POST_CONTENT );
				break;
		}

		return apply_filters( 'activitypub_object_content_template', $template, $this->wp_post );
	}

	/**
	 * Transforms the WP_Post object to an ActivityPub Object
	 *
	 * @see \Activitypub\Activity\Base_Object
	 * @param WP_Post $wp_post The WordPress Post
	 *
	 * @return \Activitypub\Activity\Base_Object The ActivityPub Object
	 */
	public function transform() {
		$object  = new Base_Object();
		$wp_post = $this->get_wp_post();

		$object->set_id( $this->get_id() );
		$object->set_url( $this->get_url() );
		$object->set_type( $this->get_object_type() );

		$published = \strtotime( $wp_post->post_date_gmt );

		$object->set_published( \gmdate( 'Y-m-d\TH:i:s\Z', $published ) );

		$updated = \strtotime( $wp_post->post_modified_gmt );

		if ( $updated > $published ) {
			$object->set_updated( \gmdate( 'Y-m-d\TH:i:s\Z', $updated ) );
		}

		$object->set_attributed_to( $this->get_attributed_to() );
		$object->set_content( $this->get_content() );
		$object->set_content_map( $this->get_content_map );
		$path = sprintf( 'users/%d/followers', intval( $wp_post->post_author ) );

		$object->set_to(
			array(
				'https://www.w3.org/ns/activitystreams#Public',
				get_rest_url_by_path( $path ),
			)
		);
		$object->set_cc( $this->get_cc() );
		$object->set_attachment( $this->get_attachments() );
		$object->set_tag( $this->get_tags() );

		return $object;
	}
}