<?php
/**
 * Event output for the REST API.
 *
 * @package SpaceBay
 */

namespace SpaceBay\Events;

use SpaceBay\Feed\Formatter;
use SpaceBay\Frontend\Portal;
use SpaceBay\Spaces\SpaceRepository;
use SpaceBay\Support\Time;

defined( 'ABSPATH' ) || exit;

/**
 * Formats events for a viewer.
 */
final class EventFormatter {

	/**
	 * Formats several events with few queries.
	 *
	 * @param array[] $events    Event rows.
	 * @param int     $viewer_id Viewer.
	 * @return array[]
	 */
	public static function many( array $events, $viewer_id ) {
		$answers = Events::answers_of( wp_list_pluck( $events, 'id' ), $viewer_id );
		$authors = Formatter::authors( wp_list_pluck( $events, 'user_id' ) );
		$items   = array();

		foreach ( $events as $event ) {
			$space = SpaceRepository::find( $event['space_id'] );

			if ( $space ) {
				$items[] = self::one( $event, $space, $viewer_id, $answers[ $event['id'] ] ?? '', $authors[ $event['user_id'] ] ?? Formatter::deleted_author() );
			}
		}

		return $items;
	}

	/**
	 * Formats one event.
	 *
	 * @param array      $event     Event row.
	 * @param array      $space     Space row.
	 * @param int        $viewer_id Viewer.
	 * @param string     $answer    Viewer's answer.
	 * @param array|null $organizer Formatted organizer, looked up when null.
	 * @return array
	 */
	public static function one( array $event, array $space, $viewer_id, $answer, $organizer = null ) {
		if ( null === $organizer ) {
			$authors   = Formatter::authors( array( $event['user_id'] ) );
			$organizer = $authors[ $event['user_id'] ] ?? Formatter::deleted_author();
		}

		$can_edit = Events::can_edit( $event, $space, $viewer_id );
		/**
		 * Filters whether the viewer sees the online link of an event.
		 *
		 * @since 1.0.0
		 *
		 * @param bool   $see_link Whether the link is shown.
		 * @param array  $event    Event row.
		 * @param string $answer   Viewer's answer.
		 * @param bool   $can_edit Whether the viewer can change the event.
		 */
		$see_link = (bool) apply_filters( 'spacebay_event_can_see_link', $can_edit || in_array( $answer, array( 'going', 'maybe' ), true ), $event, $answer, $can_edit );
		$ended    = strtotime( $event['ends_at'] . ' UTC' ) <= time();

		$data = array(
			'id'               => $event['id'],
			'title'            => $event['title'],
			'description'      => $can_edit ? (string) $event['description'] : '',
			'description_html' => (string) $event['description_rendered'],
			'location_type'    => $event['location_type'],
			'location'         => $event['location'],
			'online_url'       => $see_link ? $event['online_url'] : '',
			'has_link'         => '' !== $event['online_url'],
			'going_count'      => $event['going_count'],
			'maybe_count'      => $event['maybe_count'],
			'status'           => $event['status'],
			'is_past'          => $ended,
			'starts_at'        => Time::iso( $event['starts_at'] ),
			'ends_at'          => Time::iso( $event['ends_at'] ),
			'created_at'       => Time::iso( $event['created_at'] ),
			'url'              => Portal::link( 'events/' . $event['id'] ),
			'space'            => array(
				'id'      => $space['id'],
				'title'   => $space['title'],
				'slug'    => $space['slug'],
				'privacy' => $space['privacy'],
				'icon'    => isset( $space['settings']['icon'] ) ? (string) $space['settings']['icon'] : '',
				'color'   => isset( $space['settings']['color'] ) ? (string) $space['settings']['color'] : '',
			),
			'organizer'        => $organizer,
			'viewer'           => array(
				'answer'   => $answer,
				'can_rsvp' => $viewer_id > 0 && Events::can_rsvp( $event, $space, $viewer_id ),
				'can_edit' => $can_edit,
				'see_link' => $see_link,
			),
		);

		/**
		 * Filters an event as sent to the apps. SpaceBay Pro adds the place
		 * limit ("capacity" and "spots_left").
		 *
		 * @since 1.0.0
		 *
		 * @param array  $data      Event data.
		 * @param array  $event     Event row.
		 * @param array  $space     Space row.
		 * @param int    $viewer_id Viewer.
		 * @param string $answer    Viewer's answer.
		 */
		return apply_filters( 'spacebay_event_data', $data, $event, $space, $viewer_id, $answer );
	}
}