<?php
/**
 * Models an Event.
 *
 * @since   4.9.9
 *
 * @package Tribe\Events\Models\Post_Types
 */

namespace Tribe\Events\Models\Post_Types;

use DateInterval;
use DatePeriod;
use DateTimeZone;
use Tribe\Events\Collections\Lazy_Post_Collection;
use Tribe\Models\Post_Types\Base;
use Tribe\Utils\Date_I18n;
use Tribe\Utils\Date_I18n_Immutable;
use Tribe\Utils\Lazy_Boolean;
use Tribe\Utils\Lazy_Collection;
use Tribe\Utils\Lazy_String;
use Tribe\Utils\Post_Thumbnail;
use Tribe__Date_Utils as Dates;
use Tribe__Events__Featured_Events as Featured;
use Tribe__Events__Organizer as Organizer;
use Tribe__Events__Timezones as Timezones;
use Tribe__Events__Venue as Venue;
use WP_Post;

/**
 * Class Event
 *
 * @since   4.9.9
 *
 * @package Tribe\Events\Post_Types
 */
class Event extends Base {


	/**
	 * {@inheritDoc}
	 */
	protected function build_properties( $filter ) {
		try {
			$cache_this = $this->get_caching_callback( $filter );

			$now        = Dates::build_date_object( 'now' );
			$one_second = new DateInterval( 'PT1S' );
			$one_day    = new DateInterval( 'P1D' );

			$post_id = $this->post->ID;

			$post_meta = get_post_meta( $post_id );

			$start_date            = isset( $post_meta['_EventStartDate'][0] ) ? $post_meta['_EventStartDate'][0] : null;
			$start_date_utc        = isset( $post_meta['_EventStartDateUTC'][0] ) ? $post_meta['_EventStartDateUTC'][0] : null;
			$end_date              = isset( $post_meta['_EventEndDate'][0] ) ? $post_meta['_EventEndDate'][0] : null;
			$end_date_utc          = isset( $post_meta['_EventEndDateUTC'][0] ) ? $post_meta['_EventEndDateUTC'][0] : null;
			$duration              = (int) isset( $post_meta['_EventDuration'][0] ) ? $post_meta['_EventDuration'][0] : null;
			$timezone_string       = Timezones::get_event_timezone_string( $post_id );
			$all_day               = tribe_is_truthy( isset( $post_meta['_EventAllDay'][0] ) ? $post_meta['_EventAllDay'][0] : null );
			$end_of_day            = tribe_end_of_day( $start_date );
			$timezone              = Timezones::build_timezone_object( $timezone_string );
			$site_timezone         = Timezones::build_timezone_object();
			$utc_timezone          = new DateTimezone( 'UTC' );
			$start_date_object     = Dates::immutable( $start_date, $timezone );
			$end_date_object       = Dates::immutable( $end_date, $timezone );
			$start_date_utc_object = Dates::immutable( $start_date_utc, $utc_timezone );
			$end_date_utc_object   = Dates::immutable( $end_date_utc, $utc_timezone );
			$end_of_day_object     = Dates::immutable( $end_of_day, $timezone );

			if ( empty( $duration ) ) {
				// This is really an edge case, but here we have the information to rebuild it.
				$duration = $end_date_utc_object->getTimestamp() - $start_date_utc_object->getTimestamp();
			}

			/*
			 * An event is multi-day if its end date is after the end-of-day cutoff of the start date.
			 * We add one second to make sure events ending at end-of-day, same day, cutoff are not marked as multi-day.
			 */
			$multiday = false;

			if ( $all_day ) {
				$start_end_diff = $start_date_object->diff( $end_date_object->add( $one_second ) );
				$is_multiday    = $start_end_diff->days > 1;
				$multiday       = $is_multiday ? $start_end_diff->days : false;
			} else {
				$is_multiday = $end_of_day_object->add( $one_second ) < $end_date_object;

				if (
					! $is_multiday
					&& $end_date_object->format( Dates::DBDATEFORMAT ) !== $start_date_object->format( Dates::DBDATEFORMAT )
				) {
					$is_multiday = true;
				}

				// Multi-day events will span at least two days: the day they start on and the following one.
				if ( $is_multiday ) {
					/*
					 * Count the number of cut-offs happening before the end date and add 1.
					 * Do not add 1 for all-day events as they span cut-off to cut-off.
					 */
					$multiday = 1;

					// The end date should be inclusive, since it's not in the DatePeriod we work-around it adding a second.
					$period = new DatePeriod( $end_of_day_object, $one_day, $end_date_object );
					foreach ( $period as $date ) {
						++ $multiday;
					}
				}
			}

			// Without a context these values will not make sense; we'll set them if the `$filter` argument is a date.
			$starts_this_week   = null;
			$ends_this_week     = null;
			$happens_this_week  = null;
			$this_week_duration = null;
			$displays_on        = [];

			if ( 'raw' !== $filter && Dates::is_valid_date( $filter ) ) {
				[ $week_start, $week_end ] = Dates::get_week_start_end( $filter );

				$week_cache_key = $post_id . '_' . $week_start->format( Dates::DBDATEFORMAT ) . '_week';
				$cached = tribe( 'cache' )[ $week_cache_key ];

				if ( ! empty( $cached ) ) {
					[ $happens_this_week, $starts_this_week, $ends_this_week, $this_week_duration, $displays_on] = $cached;
					$displays_on = (array) $displays_on;
				} else {
					$the_start = $start_date_object;
					$the_end   = $end_date_object;// Take into account the timezone settings.
					if ( Timezones::is_mode( Timezones::SITE_TIMEZONE ) ) {
						// Move the event to the site timezone.
						$the_start = $the_start->setTimezone( $site_timezone );
						$the_end   = $the_end->setTimezone( $site_timezone );
					}
					$displays_on       = [ $the_start->format( Dates::DBDATEFORMAT ) ];
					$week_start_ymd    = (int) $week_start->format( 'Ymd' );
					$week_end_ymd      = (int) $week_end->format( 'Ymd' );
					$the_start_ymd     = (int) $the_start->format( 'Ymd' );
					$the_end_ymd       = (int) $the_end->format( 'Ymd' );
					$starts_this_week  = $week_start_ymd <= $the_start_ymd && $the_start_ymd <= $week_end_ymd;
					$ends_this_week    = $week_start_ymd <= $the_end_ymd && $the_end_ymd <= $week_end_ymd;
					$happens_this_week = $week_start_ymd <= $the_end_ymd && $the_start_ymd <= $week_end_ymd;/*
					 * A day "crosses the EOD cutoff time" if the end is after the EOD cutoff of the start.
					 * Here we look just for a boolean.
					 */
					$cross_day = tribe_end_of_day( $the_start->format( 'Y-m-d' ) ) < $the_end->format( 'Y-m-d H:i:s' );
					if ( $happens_this_week ) {
						$this_week_duration = 1;
						if ( $is_multiday ) {
							if ( $starts_this_week && $ends_this_week ) {
								$this_week_duration = min( 7,
									max( 1, Dates::date_diff( $the_end_ymd, $the_start_ymd ) ) + $cross_day );
							} elseif ( $ends_this_week ) {
								$this_week_duration = Dates::date_diff( $the_end_ymd, $week_start_ymd ) + $cross_day;
							} elseif ( $starts_this_week ) {
								$this_week_duration = Dates::date_diff( $week_end_ymd, $the_start_ymd ) + $cross_day;
							} else {
								// If it happens this week and it doesn't start or end this week, then it spans the week.
								$this_week_duration = 7;
							}
						}

						$this_week_duration = min( 7, $this_week_duration );
					}
				}
			}

			$featured              = tribe_is_truthy( isset( $post_meta[ Featured::FEATURED_EVENT_KEY ][0] ) ? $post_meta[ Featured::FEATURED_EVENT_KEY ][0] : null );
			$sticky                = get_post_field( 'menu_order', $post_id ) === - 1;
			$organizer_names_fetch = Organizer::get_fetch_names_callback( $post_id );
			$organizer_fetch       = Organizer::get_fetch_callback( $post_id );
			$venue_fetch           = Venue::get_fetch_callback( $post_id );

			$start_site         = $start_date_object->setTimezone( $site_timezone );
			$end_site           = $end_date_object->setTimezone( $site_timezone );
			$use_event_timezone = Timezones::is_mode( Timezones::EVENT_TIMEZONE );

			$properties = [
				'start_date'             => $start_date,
				'start_date_utc'         => $start_date_utc,
				'end_date'               => $end_date,
				'end_date_utc'           => $end_date_utc,
				'dates'                  => (object) [
					'start'         => $start_date_object,
					'start_utc'     => $start_date_utc_object,
					'start_site'    => $start_site,
					'start_display' => $use_event_timezone ? $start_date_object : $start_site,
					'end'           => $end_date_object,
					'end_utc'       => $end_date_utc_object,
					'end_site'      => $end_site,
					'end_display'   => $use_event_timezone ? $end_date_object : $end_site,
				],
				'timezone'               => $timezone_string,
				'duration'               => $duration,
				'multiday'               => $multiday,
				'is_past'                => $start_date_object < $now,
				'is_now'                 => Dates::is_now( $start_date, $end_date ),
				'all_day'                => $all_day,
				'starts_this_week'       => $starts_this_week,
				'ends_this_week'         => $ends_this_week,
				'this_week_duration'     => $this_week_duration,
				'happens_this_week'      => $happens_this_week,
				'displays_on'            => $displays_on,
				'featured'               => $featured,
				'sticky'                 => $sticky,
				'cost'                   => tribe_get_cost( $post_id, true ),
				'excerpt'                => (
					new Lazy_String(
						static function () use ( $post_id ) {
							return tribe_events_get_the_excerpt( $post_id, wp_kses_allowed_html( 'post' ) );
						},
						false
					)
				)->on_resolve( $cache_this ),
				'organizer_names'        => ( new Lazy_Collection( $organizer_names_fetch ) )->on_resolve( $cache_this ),
				'organizers'             => (
				new Lazy_Post_Collection(
					$organizer_fetch,
					'tribe_get_organizer_object'
				)
				)->on_resolve( $cache_this ),
				'venues'                 => (
				new Lazy_Post_Collection(
					$venue_fetch,
					'tribe_get_venue_object' )
				)->on_resolve( $cache_this ),
				'thumbnail'              => ( new Post_Thumbnail( $post_id ) )->on_resolve( $cache_this ),
				'permalink'              => ( new Lazy_String(
					static function () use ( $post_id ) {
						$permalink = get_permalink( $post_id );
						return (string) ( empty( $permalink ) ? '' : $permalink );
					},
					false
				) )->on_resolve( $cache_this ),
				'schedule_details'       => ( new Lazy_String(
					static function () use ( $post_id ) {
						return tribe_events_event_schedule_details( $post_id );
					},
					false
				) )->on_resolve( $cache_this ),
				'short_schedule_details' => ( new Lazy_String(
					static function () use ( $post_id ) {
						return tribe_events_event_short_schedule_details( $post_id );
					},
					false
				) )->on_resolve( $cache_this ),
				'plain_schedule_details' => ( new Lazy_String(
					static function () use ( $post_id ) {
						return tribe_events_event_schedule_details( $post_id, '', '', false );
					},
					false
				) )->on_resolve( $cache_this ),
				'title'                  => ( new Lazy_String(
					static function () use ( $post_id ) {
						$title = get_the_title( $post_id );
						return (string) ( empty( $title ) ? '' : $title );
					},
					false
				) )->on_resolve( $cache_this ),
			];
		} catch ( \Exception $e ) {
			return [];
		}

		return $properties;
	}

	/**
	 * {@inheritDoc}
	 */
	protected function get_cache_slug() {
		return 'events';
	}

	/**
	 * When dealing with a lot of events and the way we handle templates we need a way to prime the cache for the events
	 * that we know will for sure be on the base, allowing us to prevent queries to Posts to be requested individually
	 * which can lead to hundreds of more SQL calls.
	 *
	 * @since 6.0.0
	 *
	 * @param array<int|WP_Post> $events
	 */
	public static function prime_cache( array $events = [] ) {
		$first = reset( $events );
		$is_numeric = ( ! $first instanceof WP_Post );
		if ( $is_numeric ) {
			$event_ids = $events;
		} else {
			$event_ids = wp_list_pluck( $events, 'ID' );
		}

		/**
		 * Allows changing which Post IDs will get primed for cache.
		 *
		 * @since 6.0.0
		 *
		 * @param array<int> $event_ids Which IDs we will prime.
		 * @param array<int|WP_Post> $events Which event objects will generate the ids.
		 */
		$event_ids = apply_filters( 'tec_events_prime_cache_post_ids', $event_ids, $events );

		_prime_post_caches( $event_ids );

		$venue_ids =  array_map( static function( $event ) use ( $is_numeric )  {
			return array_filter(
				array_map(
					'absint',
					(array) get_post_meta( $is_numeric ? $event : $event->ID, '_EventVenueID' )
				)
			);
		}, $events );
		$venue_ids = empty( $venue_ids ) ? [] : array_merge( ...$venue_ids );

		$organizer_ids = array_map( static function( $event ) use ( $is_numeric ) {
			return array_filter(
				array_map(
					'absint',
					(array) get_post_meta( $is_numeric ? $event : $event->ID, '_EventOrganizerID' )
				)
			);
		}, $events );

		$organizer_ids = empty( $organizer_ids ) ? [] : array_merge( ...$organizer_ids );

		$attachment_ids[] = array_map( static function( $post ) use ( $is_numeric ) {
			$post_id = $is_numeric ? $post : $post->ID;
			return (int) get_post_meta( $post_id, '_thumbnail_id', true );
		}, $events );

		$attachment_ids = array_filter( array_merge( ...$attachment_ids ) );
		$posts = array_unique( array_merge( $venue_ids, $organizer_ids, $attachment_ids ) );

		_prime_post_caches( $posts );
	}

	/**
	 * Overrides the base method to conver the I18n Dates to PHP built-in Date types.
	 *
	 * @since 6.0.3.1
	 *
	 * @param array<string,mixed> $properties The properties to filter.
	 *
	 * @return array<string,mixed> The filtered properties.
	 *
	 * @throws \Exception If a date cannot be converted to a DateTime object.
	 */
	protected function scalar_serialize_properties( array $properties ): array {
		// Convert the dates to built-in PHP date objects.
		$properties['dates'] = array_map( static function ( $date ) {
			if ( $date instanceof Date_I18n_Immutable ) {
				return new \DateTimeImmutable( $date->format( 'Y-m-d H:i:s' ), $date->getTimezone() );
			}

			if ( $date instanceof Date_I18n ) {
				return new \DateTime( $date->format( 'Y-m-d H:i:s' ), $date->getTimezone() );
			}

			return $date;
		}, get_object_vars( $properties['dates'] ) );

		return $properties;
	}

	/**
	 * Overrides the base method to convert date properties to I18n Dates.
	 *
	 * @since 6.0.3.1
	 *
	 * @param array<string,mixed> $properties The properties to filter.
	 *
	 * @return array<string,mixed> The filtered properties.
	 *
	 * @throws \Exception If a date cannot be converted to a I18n Date object.
	 */
	protected function scalar_unserialize_properties( array $properties ): array {
		$properties['dates'] = (object) array_map( static function ( $date ) {
			if ( $date instanceof \DateTimeImmutable ) {
				return new Date_I18n_Immutable( $date->format( 'Y-m-d H:i:s' ), $date->getTimezone() );
			}

			if ( $date instanceof \DateTime ) {
				return new Date_I18n( $date->format( 'Y-m-d H:i:s' ), $date->getTimezone() );
			}

			return $date;
		}, $properties['dates'] ?? [] );

		return $properties;
	}
}
