<?php
/**
 * Renders the week view
 *
 * @since   4.7.5
 * @package Tribe\Events\Pro\Views\V2\Views
 */

namespace Tribe\Events\Pro\Views\V2\Views;

use Tribe\Events\Views\V2\Messages;
use Tribe\Events\Views\V2\Utils\Stack;
use Tribe\Events\Views\V2\Views\By_Day_View;
use Tribe\Events\Views\V2\Views\Day_View;
use Tribe\Events\Views\V2\Views\Traits\With_Fast_Forward_Link;
use Tribe\Utils\Date_I18n;
use Tribe__Context as Context;
use Tribe__Date_Utils as Dates;
use Tribe__Events__Timezones as Timezones;
use Tribe\Events\Views\V2\Views\Traits\With_Noindex;

use DateTime;

/**
 * Class Week_View
 *
 * @since   4.7.5
 *
 * @package Tribe\Events\Pro\Views\V2\Views
 */
class Week_View extends By_Day_View {
	use With_Fast_Forward_Link;
	use With_Noindex;

	/**
	 * Slug for this view
	 *
	 * @deprecated 6.0.7
	 *
	 * @var string
	 */
	protected $slug = 'week';

	/**
	 * Statically accessible slug for this view.
	 *
	 * @since 6.0.7
	 *
	 * @var string
	 */
	protected static $view_slug = 'week';

	/**
	 * Cached dates for the prev/next links.
	 *
	 * @since 5.14.2
	 *
	 * @var array
	 */
	protected array $memoized_dates = [];

	/**
	 * Visibility for this view.
	 *
	 * @since 4.7.5
	 * @since 4.7.9 Made the property static.
	 *
	 * @var bool
	 */
	protected static $publicly_visible = true;

	/**
	 * Whether to hide the week-ends or not.
	 *
	 * @since 5.0.0
	 *
	 * @var bool
	 */
	protected $hide_weekends = false;

	/**
	 * Week_View constructor.
	 *
	 * @since 5.0.0
	 *
	 * {@inheritDoc}
	 */
	public function __construct( Messages $messages, Stack $stack ) {
		parent::__construct( $messages, $stack );
		/**
		 *  Allows filtering of the week_view_hide_weekends option.
		 *
		 * @since 5.6.0
		 *
		 * @param boolean $hide_weekends whether to hide weekend on the view or not.
		 */
		$this->hide_weekends = apply_filters( 'tribe_week_view_hide_weekends', tribe_is_truthy( tribe_get_option( 'week_view_hide_weekends', false ) ) );
	}

	/**
	 * Default untranslated value for the label of this view.
	 *
	 * @since 6.0.3
	 *
	 * @var string
	 */
	protected static $label = 'Week';

	/**
	 * @inheritDoc
	 */
	public static function get_view_label(): string {
		static::$label = _x( 'Week', 'The text label for the Week View.', 'tribe-events-calendar-pro' );

		return static::filter_view_label( static::$label );
	}

	/**
	 * {@inheritDoc}
	 */
	protected function setup_repository_args( Context $context = null ) {
		$context = null !== $context ? $context : $this->context;

		/*
		 * We'll not fetch the week events in one single sweep, but day-by-day.
		 * Here we just set up some common arguments for the repository that will be common to any day.
		 */

		$args = parent::setup_repository_args( $context );

		$date = $context->get( 'event_date', 'now' );

		$this->user_date = Dates::build_date_object( $date )->format( 'Y-m-d' );

		return $args;
	}

	/**
	 * {@inheritDoc}
	 */
	protected function setup_template_vars() {
		$template_vars = parent::setup_template_vars();

		$user_date = $this->context->get( 'event_date', 'now' );

		list( $week_start, $week_end ) = $this->calculate_grid_start_end( $user_date );

		$stack_toggle_threshold = $this->get_stack_toggle_threshold();
		$stack                  = $this->get_stack( $user_date, $stack_toggle_threshold );
		// Prepare a modified version of the stack made of numeric arrays, not associative ones, to allow `list` calls.
		$list_ready_stack = array_combine(
			array_keys( $stack ),
			array_map(
				static function ( array $day_stack ) {
					return array_values( $day_stack );
				},
				$stack )
		);

		$events = $this->get_events( $user_date );

		// Set up the messages using the union of stack events and non-stack events: both apply.
		$non_stack_events = $events;
		$stack_events     = array_map(
			static function ( $day_events ) {
				$valid_day_events = array_filter(
					(array) $day_events,
					static function ( $day_event ) {
						return isset( $day_event->ID );
					}
				);

				return wp_list_pluck( $valid_day_events, 'ID' );
			},
			array_column( $list_ready_stack, 0 )
		);
		$msg_events       = array_merge_recursive( $non_stack_events, $stack_events );
		$this->setup_messages( $msg_events );

		$today      = $this->context->get( 'today' );
		$today_date = Dates::build_date_object( $today );

		$template_vars['today']                     = tribe_beginning_of_day( $today );
		$template_vars['today_date']                = $today_date->format( 'Y-m-d' );
		$template_vars['week_start']                = $week_start;
		$template_vars['week_end']                  = $week_end;
		$template_vars['week_start_date']           = $week_start->format( Dates::DBDATEFORMAT );
		$template_vars['week_end_date']             = $week_end->format( Dates::DBDATEFORMAT );
		$template_vars['days_of_week']              = $this->get_header_grid( $week_start, $week_end );
		$template_vars['is_current_week']           = $this->is_current_week( $today_date, $week_start, $week_end );
		$date_format                                = tribe_get_option( 'dateWithoutYearFormat', 'F Y' );
		$template_vars['formatted_week_start_date'] = $week_start->format_i18n( $date_format );
		$template_vars['formatted_week_end_date']   = $week_end->format_i18n( $date_format );
		$template_vars['formatted_grid_times']      = static::get_formatted_grid_times();
		$template_vars['mobile_days']               = $this->get_mobile_days( $user_date );
		$template_vars['days']                      = $this->get_grid_days( $user_date );
		$template_vars['multiday_events']           = $list_ready_stack;
		$template_vars['has_multiday_events']       = $this->get_has_multiday_events( $list_ready_stack );
		$template_vars['events']                    = $events;

		// Handle indexing on prev/next links.
		$next_week_num       = Dates::build_date_object( $this->context->get( 'event_date' ) )->modify( '+1 week' )->format( 'W' );
		$prev_week_num       = Dates::build_date_object( $this->context->get( 'event_date' ) )->modify( '-1 week' )->format( 'W' );
		$next_event_date     = $this->get_next_event_date();
		$previous_event_date = $this->get_previous_event_date();

		$index_next_rel = $next_event_date && $next_week_num === $next_event_date;
		$index_prev_rel = $previous_event_date && $prev_week_num === $previous_event_date;
		$template_vars['next_rel'] = $index_next_rel ? 'next' : 'noindex';
		$template_vars['prev_rel'] = $index_prev_rel ? 'prev' : 'noindex';

		$template_vars['multiday_min_toggle'] = $stack_toggle_threshold;

		// If any of the days in the stack has more events than the threshold, then show the toggle.
		$highest_stack                             = max( ... array_map( 'count', array_column( $stack, 'events' ) ) );
		$show_stack_toggle                         = $highest_stack > $stack_toggle_threshold;
		$template_vars['multiday_display_toggle']  = $show_stack_toggle;
		$template_vars['multiday_toggle_controls'] = $show_stack_toggle
			? $this->build_stack_toggle_controls( $stack )
			: '';
		$template_vars['messages']                 = $this->get_messages( $events );
		$template_vars['hide_weekends']            = $this->hide_weekends || $this->context->get( 'hide_weekends' );
		$template_vars['time_format']              = get_option( 'time_format', 'g:i a' );

		return $template_vars;
	}

	/**
	 * {@inheritDoc}
	 */
	protected function calculate_grid_start_end( $date ) {
		return Dates::get_week_start_end( $date, (int) $this->context->get( 'start_of_week', 0 ) );
	}

	/**
	 * Returns if it's the current week.
	 *
	 * @since 4.7.9
	 *
	 * @param \DateTimeInterface $today_date Today's date object.
	 * @param \DateTimeInterface $week_start The week start date object.
	 * @param \DateTimeInterface $week_end The week end date object.
	 *
	 * @return bool True if $today is part of the week.
	 */
	protected function is_current_week( $today, $week_start, $week_end ) {
		return $week_start <= $today && $today <= $week_end;
	}

	/**
	 * Returns the Week events, formatted as required by the mobile events template.
	 *
	 * @since 4.7.7
	 *
	 * @param string|int|\DateTimeInterface $user_date The user date, it might have been set to the default value or be set
	 *                                        explicitly.
	 *
	 * @return array An array of days of the week in the shape `[ <Y-m-d> => [ ...<day_mobile_data> ] ]`.
	 */
	protected function get_mobile_days( $user_date ) {
		$mobile_days = [];

		$grid_days = parent::get_grid_days( $user_date );

		foreach ( $grid_days as $date_string => $event_ids ) {
			$message_mobile = count( $event_ids ) < 1
				? Messages::for_key( 'day_no_results_found', date_i18n( tribe_get_date_format( true ), Dates::build_date_object( $date_string )->getTimestamp() ), null )
				: '';

			$mobile_days[ $date_string ] = [
				'date'           => $date_string,
				'found_events'   => count( $event_ids ),
				'event_times'    => $this->parse_event_times( $event_ids ),
				'message_mobile' => $message_mobile,
				'more_events'    => max( count( $event_ids ) - $this->get_events_per_day(), 0 ),
				'day_url'        => tribe_events_get_url( [ 'eventDisplay' => Day_View::get_view_slug(), 'eventDate' => $date_string ] ),
			];
		}

		return $mobile_days;
	}

	/**
	 * Parses and returns the times of a list of events to group them by start time, rounded to the half-hour.
	 *
	 * The half-hour rounding is as follows:
	 * - 0 to 14' is rounded to the start of the hour.
	 * - 15' to 45' is rounded to the half hour.
	 * - 46' to end of hour is rounded to the end of the hour.
	 *
	 * @since 4.7.7
	 *
	 * @param array $event_ids An array of event post IDs happening on the day.
	 *
	 * @return array The event post IDs, grouped by their start time, rounded by the criteria outlined above.
	 */
	protected function parse_event_times( array $event_ids ) {
		/*
		 * In this method the events are already ordered with respect to their start dates and timezone settings.
		 * Here we just group them by start time.
		 * The start time has, but, to take the timezone settings into account.
		 */
		$use_site_timezone = Timezones::is_mode( 'site' );
		$time_format       = get_option( 'time_format', Dates::TIMEFORMAT );
		$event_times       = [];
		$all_day           = [];
		$ongoing           = [];

		foreach ( $event_ids as $event_id ) {
			$event = tribe_get_event( $event_id );

			if ( ! $event instanceof \WP_Post ) {
				continue;
			}

			if ( ! empty( $event->all_day ) ) {
				$all_day['all_day']['events'][] = $event;
				continue;
			}

			if ( ! empty( $event->multiday ) ) {
				$ongoing['ongoing']['events'][] = $event;
				continue;
			}

			/** @var \Tribe\Utils\Date_I18n_Immutable $start */

			$start = $use_site_timezone ? $event->dates->start_site : $event->dates->start;
			$time  = $start->setTime( (int) $start->format( 'G' ), 0, 0 )->format_i18n( $time_format );

			// ISO 8601 format, e.g. `2019-01-01T00:00:00+00:00`.
			$datetime = $start->format( 'c' );

			if ( ! isset( $event_times[ $time ] ) ) {
				$event_times[ $time ] = [ 'time' => $time, 'datetime' => $datetime, 'events' => [] ];
			}

			$event_times[ $time ]['events'][] = $event;
		}

		$event_times = $all_day + $ongoing + $event_times;

		// Trim down number of events on mobile to match settings.
		$events_per_day = $this->get_events_per_day();
		$events_per_day = 0 > $events_per_day ? null : $events_per_day;

		return array_slice( $event_times, 0, $events_per_day );
	}

	/**
	 * Returns the events for each day of the week.
	 *
	 * This method overrides the base one to specialize the format of the returned events to the one required by the
	 * Week View.
	 *
	 * @since 4.7.8
	 *
	 * @param mixed|null $date The date, located anywhere in the week, that should be used to get the days.
	 * @param bool $force Whether to force a new fetch and ignore the cached events, or not.
	 *
	 * @return array An array of the Week events, by day, in the shape `[ <Y-m-d> => [ ...<events>] ]`.
	 */
	public function get_grid_days( $date = null, $force = false ) {
		$grid_days = [];

		$raw_grid_days = parent::get_grid_days( $date, $force );

		$raw_grid_days = $this->maybe_remove_weekends( $raw_grid_days );

		foreach ( $raw_grid_days as $date_string => $event_ids ) {
			$day_date = Dates::build_date_object( $date_string );

			$grid_days[ $date_string ] = [
				'datetime'     => $date_string,
				'weekday'      => $day_date->format_i18n( 'D' ),
				'daynum'       => $day_date->format( 'j' ),
				'found_events' => count( $event_ids ),
				'more_events'  => max( count( $event_ids ) - $this->get_events_per_day(), 0 ),
				'day_url'      => tribe_events_get_url( [ 'eventDisplay' => Day_View::get_view_slug(), 'eventDate' => $day_date->format( 'Y-m-d' ) ] ),
			];
		}

		return $grid_days;
	}

	/**
	 * Returns an array of the Week View stack events, or events otherwise belonging in the stack, by day.
	 *
	 * @since 4.7.8
	 *
	 * @param null|string|\DateTime $user_date The date to fetch the events for. The date can be in any position in the
	 *                                         week: the start and end date will be calculated to always return a week
	 *                                         long array.
	 * @param int $multiday_toggle How many events to show before "folding" the stack and showing a "Show more" control.
	 *
	 * @return array Each day stack, in the shape `[ <Y-m-> => [ ...$stack ] ]`.
	 */
	protected function get_stack( $user_date = null, $multiday_toggle = null ) {
		$grid_days = parent::get_grid_days( $user_date );

		$stack = $this->stack->build_from_events( $grid_days );

		$stack = $this->maybe_remove_weekends( $stack );

		$week_stack = [];

		foreach ( $stack as $day_date => $elements ) {
			$date_object = Dates::build_date_object( $day_date );
			$counter     = 0;

			foreach ( $elements as $index => &$element ) {
				$counter ++;

				if ( ! is_numeric( $element ) ) {
					// It's a spacer, let it be.
					continue;
				}

				$element = tribe_get_event( $element, OBJECT, $date_object->format( 'Y-m-d' ) );
				// Set the `should_display` flag property depending on the multi-day toggle settings.
				$element->should_display = $counter <= $multiday_toggle;
			}

			$more_events = 0;

			if ( null !== $multiday_toggle ) {
				// There are `n` valid events after the toggle.
				$more_events = count( array_filter( array_slice( $elements, $multiday_toggle ), static function ( $el ) {
					return $el instanceof \WP_Post;
				} ) );
			}

			$week_stack[ $day_date ] = [ 'events' => $elements, 'more_events' => $more_events ];
		}

		return $week_stack;
	}

	/**
	 * Returns an array of the Week View events not belonging to the stack (at the top of the view), by day.
	 *
	 * @since 4.7.8
	 *
	 * @param null|string|\DateTime $user_date The date to fetch the events for. The date can be in any position in the
	 *                                         week: the start and end date will be calculated to always return a week
	 *                                         long array.
	 *
	 * @return array Each day events, in the shape `[ <Y-m-> => [ ...$events ] ]`.
	 */
	protected function get_events( $user_date = null ) {
		$days           = parent::get_grid_days( $user_date );
		$days           = $this->maybe_remove_weekends( $days );


		// Filter out multi-day and all-day events and cast each event to an decorated WP_Post event object.
		foreach ( $days as $day => &$day_events ) {
			$day_events = array_reduce( $day_events, function ( array $day_events, $event_id ) {
				$event          = tribe_get_event( $event_id );
				$events_per_day = $this->get_events_per_day();
				$events_per_day = 0 > $events_per_day ? null : $events_per_day;

				if ( ! $event instanceof \WP_Post || $event->multiday > 1 || $event->all_day ) {
					return array_slice( $day_events, 0, $events_per_day );
				}

				$prev_event = end( $day_events );
				$event->classes = $this->get_event_classes( $event, $prev_event ?: null );

				$day_events[] = $event;

				return array_slice( $day_events, 0, $events_per_day );
			}, [] );
		}

		return $days;
	}

	/**
	 * Returns whether the Week View has multiday events or not.
	 *
	 * @since 5.0.0
	 *
	 * @param array $multiday_events
	 *
	 * @return bool True if week view has multiday events.
	 */
	protected function get_has_multiday_events( array $multiday_events ) {
		$has_multiday_events = false;

		foreach ( $multiday_events as $day => list( $day_multiday_events, $more_events ) ) {
			if ( count( $day_multiday_events ) ) {
				$has_multiday_events = true;
				break;
			}
		}

		return $has_multiday_events;
	}

	/**
	 * Returns the Week View header grid, the one required to render the list of days at the top of the view.
	 *
	 * @since 4.7.8
	 *
	 * @param \DateTimeInterface $week_start The week start date object.
	 * @param \DateTimeInterface $week_end The week end date object.
	 *
	 * @return array The week view header grid.
	 */
	protected function get_header_grid( \DateTimeInterface $week_start, \DateTimeInterface $week_end ) {
		$grid = [];

		$one_day = new \DateInterval( 'P1D' );
		try {
			$interval = new \DatePeriod( $week_start, $one_day, $week_end );
		} catch ( \Exception $e ) {
			// This should really not happen as we control the input of \DatePeriod, yet let's handle the case.
			return [];
		}

		$user_date = $this->context->get( 'event_date', 'now' );
		$events    = $this->get_events( $user_date );
		$stack     = $this->get_stack( $user_date );

		/** @var \DateTime $day */
		foreach ( $interval as $day ) {
			$day = Date_I18n::createFromImmutable( $day );
			if ( $this->hide_weekends && in_array( (int) $day->format( 'w' ), [ 0, 6 ], true ) ) {
				continue;
			}

			$day_y_m_d = $day->format( 'Y-m-d' );
			$day_url   = tribe_events_get_url( [ 'eventDisplay' => Day_View::get_view_slug(), 'eventDate' => $day_y_m_d ] );

			$grid[ $day_y_m_d ] = [
				'full_date'    => $day->format( tribe_get_option( 'date_with_year', Dates::DATEONLYFORMAT ) ),
				'datetime'     => $day_y_m_d,
				'weekday'      => $day->format_i18n( 'D' ),
				'daynum'       => $day->format( 'j' ),
				'day_url'      => $day_url,
				'found_events' => count( $events[ $day_y_m_d ] ) + count( $stack[ $day_y_m_d ]['events'] ),
			];
		}

		return $grid;
	}

	/**
	 * Returns the filtered value for the threshold that will fold, in Week View, the stack and show a "Show more".
	 * control
	 *
	 * @since 4.7.8
	 *
	 * @return int The filtered value for the threshold that will fold, in Week View, the stack and show a "Show more".
	 */
	protected function get_stack_toggle_threshold() {
		/**
		 * Filters the threshold that will fold, in Week View, the stack and show a "Show more" control.
		 *
		 * E.g. returning `2` here will cause 2 events to show and a "Show more" link to expand any stack with more than
		 * 2 events in it.
		 *
		 * @since 4.7.8
		 *
		 * @param int $multiday_min_toggle The threshold that will fold, in Week View, the stack and show a
		 *                                 "Show more" control.
		 */
		$multiday_min_toggle = apply_filters( 'tribe_events_views_v2_week_multiday_toggle', 3 );

		return $multiday_min_toggle;
	}

	/**
	 * Builds the space-separated list of entries for the multi-day toggle `aria-controls`.
	 *
	 * @since 4.7.8
	 *
	 * @param array $stack The view stack, in the shape `[ <Y-m-d> => [ ...$events ] ]`.
	 *
	 * @return string A space-separated list of `aria-controls` entries.
	 */
	protected function build_stack_toggle_controls( array $stack ) {
		$days = array_filter( $stack, static function ( array $day_stack ) {
			return $day_stack['more_events'] > 0;
		} );

		$prefix = static function ( $index ) {
			return 'tribe-events-pro-multiday-toggle-day-' . $index;
		};

		return implode( ' ', array_map( $prefix, array_keys( $days ) ) );
	}

	/**
	 * Returns an array of the CSS classes that should be applied to the event to render correctly in the Week View.
	 *
	 * @since 4.7.8
	 *
	 * @param \WP_Post $event The event to get the classes for.
	 *
	 * @return array An array of classes that should be applied to the event to render correctly in the Week View.
	 */
	protected function get_event_classes( \WP_Post $event, \WP_Post $prev = null ) {
		$event_classes = array_filter( [
			'vertical_position' => $this->get_event_vertical_position_class( $event ),
			'duration'          => $this->get_event_duration_class( $event ),
			'sequence'          => $this->get_event_sequence_class( $event, $prev ),
		] );

		/**
		 * Filters the classes that will be assigned to the event, in the `classes` array property, in the context
		 * of the Week View.
		 *
		 * Note this filter will only be called on events part of the day stack, the one appearing below the multi-day,
		 * all-day stack.
		 *
		 * @since 4.7.8
		 *
		 * @param array $event_classes         An array of all the classes that will be assigned to this event when
		 *                                     rendering it in the context of the week view day stack.
		 * @param \WP_Post      $event         The event the classes are being calculated for.
		 * @param \WP_Post|null $prev          The event preceding this one in the day stack or `null` if this is the
		 *                                     first event in the day stack.
		 */
		$event_classes = apply_filters( 'tribe_events_views_v2_week_event_classes', $event_classes, $event, $prev );

		return $event_classes;
	}

	/**
	 * Calculates and returns, if any, the vertical position CSS class that should be applied to the event.
	 *
	 * @since 4.7.8
	 *
	 * @param \WP_Post $event The event to calculate the vertical position class for.
	 *
	 * @return string The full vertical position CSS class for the event, if required, else an empty string.
	 */
	protected function get_event_vertical_position_class( \WP_Post $event ) {
		$start         = Timezones::is_mode( 'site' ) ? $event->dates->start_site : $event->dates->start;
		$start_hour    = (int) $start->format( 'H' );
		$start_minutes = (int) $start->format( 'i' );

		if ( 0 === $start_hour && $start_minutes <= 15 ) {
			// Starts between `00:00` and `00:15`.
			return '';
		}

		// Round to the hour.
		$pos = $start_hour;
		if ( $start_minutes >= 45 ) {
			// Round up to the next hour.
			$pos = $start_hour + 1;
		} else {
			// Round to the half hour if it starts after `:15`.
			$pos .= $start_minutes <= 15 ? '' : '-5';
		}

		return 'tribe-events-pro-week-grid__event--t-' . $pos;
	}

	/**
	 * Returns the event CSS duration class.
	 *
	 * @since 4.7.8
	 *
	 * @param \WP_Post $event The event to calculate the CSS duration class for.
	 *
	 * @return string The event CSS duration class, if required, depending on the event duration, or an empty string.
	 */
	protected function get_event_duration_class( \WP_Post $event ) {
		$hours = (int) floor( $event->duration / 3600 );

		$decimal_minutes = ( $event->duration % 3600 ) / 3600;

		$duration_string = $hours;

		if ( $decimal_minutes > .7 ) {
			$duration_string = $hours + 1;
		} elseif ( $decimal_minutes > .3 ) {
			$duration_string .= '-5';
		}

		return 'tribe-events-pro-week-grid__event--h-' . $duration_string;
	}

	/**
	 * Returns the event CSS sequence class, based on the event coming before it.
	 *
	 * @since 4.7.8
	 *
	 * @param \WP_Post      $event The event object to calculate the CSS class for.
	 * @param \WP_Post|null $prev The previous event object, if any.
	 *
	 * @return string The CSS class that should be added to the event for the sequence or an empty string.
	 */
	protected function get_event_sequence_class( \WP_Post $event, \WP_Post $prev = null ) {
		if ( null === $prev ) {
			return '';
		}

		/*
		 * Two events overlap if the start of the first is before the end of the second and if the start of the second
		 * is before the end of the first.
		 */

		if ( ! Timezones::is_mode( 'site' ) ) {
			$ends_after_prev_starts  = $prev->dates->start < $event->dates->end;
			$starts_before_prev_ends = $event->dates->start < $prev->dates->end;
		} else {
			$ends_after_prev_starts  = $prev->dates->start_site < $event->dates->end_site;
			$starts_before_prev_ends = $event->dates->start_site < $prev->dates->end_site;
		}

		$overlap = $ends_after_prev_starts && $starts_before_prev_ends;

		if ( ! $overlap ) {
			return '';
		}

		$class_base = 'tribe-events-pro-week-grid__event--seq-';

		$sequence = isset( $prev->classes['sequence'] ) ?
			(int) str_replace( $class_base, '', $prev->classes['sequence'] ) + 1
			: 2;

		return $class_base . $sequence;
	}

	/**
	 * Get the date of the event immediately previous to the current view date.
	 *
	 * @since 5.14.2
	 * @since 6.1.1 Param $current_date included.
	 *
	 * @param DateTime|string|null $current_date A DateTime object signifying the current date for the view.
	 *
	 * @return DateTime|false Either the previous event chronologically, the previous month, or false if no next event found.
	 */
	public function get_previous_event_date( $current_date = null ) {
		$args = $this->filter_repository_args( parent::setup_repository_args( $this->context ) );

		// When dealing with previous event date we only fetch one.
		$args['posts_per_page'] = 1;

		if ( empty( $current_date ) ) {
			$current_date = $this->context->get( 'event_date', 'today' );
		}

		$current_date = Dates::build_date_object( $current_date );

		// If we failed to get a proper DateTime object we return false.
		if ( ! $current_date instanceof DateTime ) {
			return false;
		}

		// Use cache to reduce the performance impact.
		$cache_key = __METHOD__ . '_' . substr( md5( wp_json_encode( [ $current_date, $args ] ) ), 10 );

		if ( isset( $this->memoized_dates[ $cache_key ] ) ) {
			return $this->memoized_dates[ $cache_key ];
		}

		list( $week_start ) = $this->calculate_grid_start_end( $current_date );

		// Find the first event that starts before the start of this month.
		$prev_event = tribe_events()
			->by_args( $args )
			->where( 'ends_before', tribe_beginning_of_day( $week_start->format( 'Y-m-d' ) ) )
			->order( 'DESC' )
			->first();

		if ( ! $prev_event instanceof \WP_Post ) {
			$this->memoized_dates[ $cache_key ] = false;

			return false;
		}

		// Show the closest week on which that event appears (but not the current week).
		$prev_date  = min(
			Dates::build_date_object( $prev_event->dates->start ),
			$current_date->modify( '-1 week' )
		);

		$prev_date = $prev_date->format( 'W' );

		$this->memoized_dates[ $cache_key ] = $prev_date;

		return $prev_date;
	}

	/**
	 * {@inheritDoc}
	 */
	public function prev_url( $canonical = false, array $passthru_vars = [] ) {
		$cache_key = __METHOD__ . '_' . md5( wp_json_encode( func_get_args() ) );

		if ( isset( $this->cached_urls[ $cache_key ] ) ) {
			return $this->cached_urls[ $cache_key ];
		}

		// Setup the Default date for the Week view here.
		$default_date = 'today';
		$date         = $this->context->get( 'event_date', $default_date );
		$current_date = Dates::build_date_object( $date );
		list( $week_start ) = $this->calculate_grid_start_end( $current_date );

		$prev_date = Dates::build_date_object( clone $week_start );
		$prev_date->sub( new \DateInterval( 'P1W' ) );

		// Let's make sure to prevent users from paginating endlessly back when we know there are no more events.
		$earliest = tribe_get_option( 'earliest_date', $prev_date->format( Dates::DBDATETIMEFORMAT ) );
		$earliest = Dates::build_date_object( $earliest );

		if ( $week_start <= $earliest ) {
			// The earliest event happens on this week, stop.
			return $this->filter_prev_url( $canonical, '' );
		}

		$url = $this->removing_week_number_rule( function () use ( $prev_date, $canonical, $passthru_vars ) {
			return $this->build_url_for_date( $prev_date, $canonical, $passthru_vars );
		} );

		$url = $this->filter_prev_url( $canonical, $url );

		$this->cached_urls[ $cache_key ] = $url;

		return $url;
	}

	/**
	 * Get the date of the event immediately after to the current view date.
	 *
	 * @since 5.14.2
	 * @since 6.1.1 Param $current_date included.
	 *
	 * @param DateTime|string|null $current_date A DateTime object signifying the current date for the view.
	 *
	 * @return DateTime|false Either the next event chronologically, the next month, or false if no next event found.
	 */
	public function get_next_event_date( $current_date = null ) {
		$args = $this->filter_repository_args( parent::setup_repository_args( $this->context ) );

		if ( isset( $args['past'] ) && tribe_is_truthy( $args['past'] ) ) {
			return false;
		}

		// When dealing with previous event date we only fetch one.
		$args['posts_per_page'] = 1;

		if ( empty( $current_date ) ) {
			$current_date = $this->context->get( 'event_date', 'today' );
		}

		$current_date = Dates::build_date_object( $current_date );

		// If we failed to get a proper DateTime object we return false.
		if ( ! $current_date instanceof DateTime ) {
			return false;
		}

		list( $week_start ) = $this->calculate_grid_start_end( $current_date );

		// Use cache to reduce the performance impact.
		$cache_key = __METHOD__ . '_' . substr( md5( wp_json_encode( [ $current_date, $args ] ) ), 10 );

		if ( isset( $this->memoized_dates[ $cache_key ] ) ) {
			return $this->memoized_dates[ $cache_key ];
		}

		list( $week_start, $week_end ) = $this->calculate_grid_start_end( $current_date );

		// For the next event date we only care about 1 item.
		$args['posts_per_page'] = 1;

		// The first event that ends after the end of the month; it could still begin in this month.
		$next_event = tribe_events()
			->by_args( $args )
			->where( 'starts_after', tribe_end_of_day( $week_end->format( 'Y-m-d' ) ) )
			->order( 'ASC' )
			->first();

		if ( ! $next_event instanceof \WP_Post ) {
			$this->memoized_dates[ $cache_key ] = false;

			return false;
		}

		// At a minimum pick the next week or the week the next event starts.
		$next_date = max(
			Dates::build_date_object( $next_event->dates->start ),
			$current_date->modify( '+1 week' )
		);

		$next_date = $next_date->format( 'W' );

		$this->memoized_dates[ $cache_key ] = $next_date;

		return $next_date;
	}

	/**
	 * {@inheritDoc}
	 */
	public function next_url( $canonical = false, array $passthru_vars = [] ) {
		$cache_key = __METHOD__ . '_' . md5( wp_json_encode( func_get_args() ) );

		if ( isset( $this->cached_urls[ $cache_key ] ) ) {
			return $this->cached_urls[ $cache_key ];
		}

		// Setup the Default date for the Week view here.
		$default_date = 'today';
		$date         = $this->context->get( 'event_date', $default_date );
		$current_date = Dates::build_date_object( $date );
		list( $week_start ) = $this->calculate_grid_start_end( $current_date );

		$utc           = new \DateTimeZone( 'UTC' );
		$next_date     = clone $week_start;
		$next_date     = $next_date->add( new \DateInterval( 'P1W' ) );
		$next_date_utc = clone $next_date;
		$next_date_utc->setTimezone( $utc );
		// Let's make sure to prevent users from paginating endlessly forward when we know there are no more events.
		$latest_ids          = tribe_get_option( 'latest_date_markers', [] );
		$latest_end_date_utc = array_reduce( $latest_ids, static function ( \DateTimeInterface $latest_end, $event_id ) use ( $utc ) {
			$event_end_date_utc = get_post_meta( $event_id, '_EventEndDateUTC', true );
			$date               = Dates::build_date_object( $event_end_date_utc, $utc );

			return $date > $latest_end ? $date : $latest_end;
		}, $next_date_utc );

		if ( $next_date_utc >= $latest_end_date_utc ) {
			// Next week starts after the latest event finished.
			return $this->filter_prev_url( $canonical, '' );
		}

		$url = $this->removing_week_number_rule( function () use ( $next_date, $canonical, $passthru_vars ) {
			return $this->build_url_for_date( $next_date, $canonical, $passthru_vars );
		} );

		$url = $this->filter_next_url( $canonical, $url );

		$this->cached_urls[ $cache_key ] = $url;

		return $url;
	}

	/**
	 * Removes the week number rules from the list of rewrite rules we handle and calls a callable.
	 *
	 * We remove the week number rule as it is ambiguous in its resolution and we're not currently supporting it.
	 * To remove the rules we use a regular expression. On regular expressions.
	 * This is not out of cruelty on the reader, but to support localizations of permalinks.
	 *
	 * @since 4.7.8
	 *
	 * @param \Closure $fn The closure to call removing the week number rewrite rules.
	 *
	 * @return mixed The return value of the closure.
	 */
	protected function removing_week_number_rule( \Closure $fn ) {
		$remove_week_number_rule = static function ( array $rules ) {
			// The event archive slug can be controlled via settings and an option: let's account for that.
			$events_slug = tribe_get_option( 'eventsSlug', 'events' );
			// Match anything that looks like this: `(?:events)/(?:week|...)/(\d{2})/?$`.
			$pattern = '/\\(\\?:' . $events_slug . '\\).*\\?:week.*\\/\\(\\\\d\\{2\\}\\)\\//um';

			// Why a regular expression? We need to take into account localizations too.
			if ( is_array( $rules ) && count( $rules ) ) {
				$rules = array_filter( $rules, static function ( $rule ) use ( $events_slug, $pattern ) {
					return ! preg_match( $pattern, $rule );
				}, ARRAY_FILTER_USE_KEY );
			}

			return $rules;
		};

		add_filter( 'tribe_rewrite_handled_rewrite_rules', $remove_week_number_rule );
		$result = $fn();
		remove_filter( 'tribe_rewrite_handled_rewrite_rules', $remove_week_number_rule );

		return $result;
	}

	/**
	 * Overrides the base View method to implement logic tailored to the Week View.
	 *
	 * @since 4.7.9
	 *
	 * @param array $events An array of the View events, if any.
	 */
	protected function setup_messages( array $events ) {
		if ( empty( $events ) || 0 === count( array_filter( $events ) ) ) {
			$keyword  = $this->context->get( 'keyword', false );
			$location = $this->context->get( 'geoloc_search', false );

			if ( $location ) {
				$this->messages->insert(
					Messages::TYPE_NOTICE,
					Messages::for_key( 'week_no_results_found_w_location', esc_html( trim( $location ) ) )
				);

				return;
			}

			if ( $keyword ) {
				$this->messages->insert(
					Messages::TYPE_NOTICE,
					Messages::for_key( 'week_no_results_found_w_keyword', esc_html( trim( $keyword ) ) )
				);

				return;
			}

			$ff_link = $this->get_fast_forward_link( true );

			if ( ! empty( $ff_link ) ) {
				$this->messages->insert(
					Messages::TYPE_NOTICE,
					Messages::for_key( 'week_no_results_found_w_ff_link', $ff_link )
				);

				return;
			}

			$message_key = $this->upcoming_events_count() ? 'week_no_results_found' : 'no_upcoming_events';
			$this->messages->insert(
				Messages::TYPE_NOTICE,
				Messages::for_key( $message_key )
			);
		}
	}

	/**
	 * Overrides the base View implementation to take into account Week View rewrite rules.
	 *
	 * @since 5.0.0
	 *
	 * @param string|int|\DateTimeInterface $date       The date to return the URL for.
	 * @param array|string                  $query_args The query string or arguments to append to the URL.
	 *
	 * @return string The URL for the Week View on the date.
	 */
	public function url_for_query_args( $date = null, $query_args = null ) {
		return $this->removing_week_number_rule( function () use ( $date, $query_args ) {
			return parent::url_for_query_args( $date, $query_args );
		} );
	}

	/**
	 * Overrides the base method to take care of Week View special back-compatibility issues w/ week number support.
	 *
	 * @since 5.0.0
	 *
	 * @inheritDoc}
	 */
	public function get_url( $canonical = false, $force = false ) {
		return $this->removing_week_number_rule( function () use ( $canonical, $force ) {
			return parent::get_url( $canonical, $canonical || $force );
		} );
	}

	/**
	 * Removes the week-ends from a result set if required by the settings.
	 *
	 * @since 5.0.0
	 *
	 * @param array $days The days to prune.
	 *
	 * @return array The pruned days, if required.
	 */
	protected function maybe_remove_weekends( array $days ) {
		if ( empty( $days || ! is_array( $days ) ) ) {
			return $days;
		}

		if ( ! $this->hide_weekends ) {
			return $days;
		}

		return array_filter( $days, static function ( $day ) {
			$day_num = (int) Dates::build_date_object( $day )->format( 'w' );

			// Sunday is `0`, Saturday is `6`.
			return $day_num !== 0 && $day_num !== 6;
		}, ARRAY_FILTER_USE_KEY );
	}

	/**
	 * Builds and returns a map relating each time in the `H:i` format to its localized version.
	 *
	 * @since 5.2.0
	 *
	 * @param string|null $time_format The time format that should be used (see the `date` supported format) or `null` to
	 *                                 use the one defined by the WordPress `time_format` option.
	 *
	 * @return array<string,string> A map relating times in their `H:i` format to their localized version, following the
	 *                              WordPress "Time Format" setting.
	 */
	public static function get_formatted_grid_times( $time_format = null ) {
		$h_i_times = array_map(
			static function ( $n ) {
				return sprintf( '%02d:00', $n );
			},
			range( 0, 24 )
		);

		$time_format          = $time_format ? $time_format : (string) get_option( 'time_format' );
		$localize_time        = static function ( $h_i_time ) use ( $time_format ) {
			return date_i18n( $time_format, strtotime( $h_i_time ) );
		};
		$formatted_grid_times = array_combine( $h_i_times, array_map( $localize_time, $h_i_times ) );

		return $formatted_grid_times;
	}

	/**
	 * Overrides the base implementation to use a Week view custom number of events per day.
	 *
	 * @since 5.6.0
	 *
	 * @return int The Week view number of events per day.
	 */
	protected function get_events_per_day() {
		$events_per_day = $this->context->get( 'week_events_per_day', -1 );

		/**
		 * Filters the number of events per day to fetch in the Week view.
		 *
		 * @since 5.6.0
		 *
		 * @param int $events_per_day The default number of events that will be fetched for each day.
		 * @param Week_View $this The current Week View instance.
		 */
		return apply_filters( 'tribe_events_views_v2_week_events_per_day', $events_per_day, $this );
	}

	/**
	 * Adds Week View to the views that get cache.
	 *
	 * @since 6.0.7
	 *
	 * @param array               $views Should the current view have its HTML cached?
	 * @param View_Interface|null $view  The object using the trait, or null in case of static usage.
	 */
	public function filter_tribe_events_views_v2_cached_views( $views, $view ) {
		$views[ self::get_view_slug() ] = true;

		return $views;
	}
}
