wp-bnb/src/Integration/Prometheus.php

<?php
/**
 * Prometheus Metrics Integration.
 *
 * Provides meaningful metrics for monitoring BnB operations.
 *
 * @package Magdev\WpBnb\Integration
 */

declare( strict_types=1 );

namespace Magdev\WpBnb\Integration;

use Magdev\WpBnb\PostTypes\Booking;
use Magdev\WpBnb\PostTypes\Building;
use Magdev\WpBnb\PostTypes\Guest;
use Magdev\WpBnb\PostTypes\Room;
use Magdev\WpBnb\PostTypes\Service;

/**
 * Prometheus Metrics Integration class.
 *
 * Exposes BnB metrics via the wp-prometheus plugin.
 */
class Prometheus {

	/**
	 * Option key for enabling metrics.
	 */
	public const OPTION_ENABLED = 'wp_bnb_metrics_enabled';

	/**
	 * Initialize the Prometheus integration.
	 *
	 * @return void
	 */
	public static function init(): void {
		// Only hook if metrics are enabled.
		if ( ! self::is_enabled() ) {
			return;
		}

		// Hook into wp-prometheus collector.
		add_action( 'wp_prometheus_collect_metrics', array( self::class, 'collect_metrics' ) );

		// Register Grafana dashboard.
		add_action( 'wp_prometheus_register_dashboards', array( self::class, 'register_dashboards' ) );
	}

	/**
	 * Check if metrics collection is enabled.
	 *
	 * @return bool
	 */
	public static function is_enabled(): bool {
		return 'yes' === get_option( self::OPTION_ENABLED, 'yes' );
	}

	/**
	 * Enable metrics collection.
	 *
	 * @return void
	 */
	public static function enable(): void {
		update_option( self::OPTION_ENABLED, 'yes' );
	}

	/**
	 * Disable metrics collection.
	 *
	 * @return void
	 */
	public static function disable(): void {
		update_option( self::OPTION_ENABLED, 'no' );
	}

	/**
	 * Collect and register all BnB metrics.
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	public static function collect_metrics( $collector ): void {
		self::collect_inventory_metrics( $collector );
		self::collect_booking_metrics( $collector );
		self::collect_guest_metrics( $collector );
		self::collect_occupancy_metrics( $collector );
		self::collect_revenue_metrics( $collector );
	}

	/**
	 * Collect inventory metrics (buildings, rooms, services).
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	private static function collect_inventory_metrics( $collector ): void {
		// Buildings total.
		$buildings_total = wp_count_posts( Building::POST_TYPE );
		$gauge           = $collector->register_gauge(
			'wp_bnb_buildings_total',
			'Total number of buildings',
			array()
		);
		$gauge->set( (int) $buildings_total->publish, array() );

		// Rooms by status.
		$rooms_gauge = $collector->register_gauge(
			'wp_bnb_rooms_total',
			'Total number of rooms by status',
			array( 'status' )
		);

		$room_statuses = array( 'available', 'occupied', 'maintenance', 'inactive' );
		foreach ( $room_statuses as $status ) {
			$count = self::count_rooms_by_status( $status );
			$rooms_gauge->set( $count, array( $status ) );
		}

		// Services by status.
		$services_gauge = $collector->register_gauge(
			'wp_bnb_services_total',
			'Total number of services by status',
			array( 'status' )
		);

		$service_statuses = array( 'active', 'inactive' );
		foreach ( $service_statuses as $status ) {
			$count = self::count_services_by_status( $status );
			$services_gauge->set( $count, array( $status ) );
		}
	}

	/**
	 * Collect booking metrics.
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	private static function collect_booking_metrics( $collector ): void {
		// Bookings by status.
		$bookings_gauge = $collector->register_gauge(
			'wp_bnb_bookings_total',
			'Total number of bookings by status',
			array( 'status' )
		);

		$booking_statuses = array( 'pending', 'confirmed', 'checked_in', 'checked_out', 'cancelled' );
		foreach ( $booking_statuses as $status ) {
			$count = self::count_bookings_by_status( $status );
			$bookings_gauge->set( $count, array( $status ) );
		}

		// Today's check-ins.
		$checkins_gauge = $collector->register_gauge(
			'wp_bnb_checkins_today',
			'Number of check-ins scheduled for today',
			array()
		);
		$checkins_gauge->set( self::count_todays_checkins(), array() );

		// Today's check-outs.
		$checkouts_gauge = $collector->register_gauge(
			'wp_bnb_checkouts_today',
			'Number of check-outs scheduled for today',
			array()
		);
		$checkouts_gauge->set( self::count_todays_checkouts(), array() );

		// Upcoming bookings (next 7 days).
		$upcoming_gauge = $collector->register_gauge(
			'wp_bnb_bookings_upcoming_7days',
			'Number of bookings starting in the next 7 days',
			array()
		);
		$upcoming_gauge->set( self::count_upcoming_bookings( 7 ), array() );

		// Average booking duration (nights).
		$avg_duration = $collector->register_gauge(
			'wp_bnb_booking_avg_duration_nights',
			'Average booking duration in nights',
			array()
		);
		$avg_duration->set( self::get_average_booking_duration(), array() );
	}

	/**
	 * Collect guest metrics.
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	private static function collect_guest_metrics( $collector ): void {
		// Total guests.
		$guests_total = wp_count_posts( Guest::POST_TYPE );
		$guests_gauge = $collector->register_gauge(
			'wp_bnb_guests_total',
			'Total number of registered guests',
			array()
		);
		$guests_gauge->set( (int) $guests_total->publish, array() );

		// Guests by status.
		$guests_status_gauge = $collector->register_gauge(
			'wp_bnb_guests_by_status',
			'Number of guests by status',
			array( 'status' )
		);

		$guest_statuses = array( 'active', 'blocked', 'vip' );
		foreach ( $guest_statuses as $status ) {
			$count = self::count_guests_by_status( $status );
			$guests_status_gauge->set( $count, array( $status ) );
		}

		// Repeat guests (guests with more than one booking).
		$repeat_gauge = $collector->register_gauge(
			'wp_bnb_guests_repeat',
			'Number of guests with more than one booking',
			array()
		);
		$repeat_gauge->set( self::count_repeat_guests(), array() );

		// New guests this month.
		$new_guests_gauge = $collector->register_gauge(
			'wp_bnb_guests_new_this_month',
			'Number of new guests registered this month',
			array()
		);
		$new_guests_gauge->set( self::count_new_guests_this_month(), array() );
	}

	/**
	 * Collect occupancy metrics.
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	private static function collect_occupancy_metrics( $collector ): void {
		// Current occupancy rate (percentage).
		$occupancy_gauge = $collector->register_gauge(
			'wp_bnb_occupancy_rate_current',
			'Current room occupancy rate (percentage)',
			array()
		);
		$occupancy_gauge->set( self::get_current_occupancy_rate(), array() );

		// Occupancy rate this month.
		$occupancy_month_gauge = $collector->register_gauge(
			'wp_bnb_occupancy_rate_this_month',
			'Room occupancy rate for the current month (percentage)',
			array()
		);
		$occupancy_month_gauge->set( self::get_monthly_occupancy_rate(), array() );

		// Rooms currently occupied.
		$occupied_gauge = $collector->register_gauge(
			'wp_bnb_rooms_currently_occupied',
			'Number of rooms currently occupied',
			array()
		);
		$occupied_gauge->set( self::count_currently_occupied_rooms(), array() );

		// Total room capacity (beds).
		$capacity_gauge = $collector->register_gauge(
			'wp_bnb_total_capacity_beds',
			'Total bed capacity across all rooms',
			array()
		);
		$capacity_gauge->set( self::get_total_bed_capacity(), array() );
	}

	/**
	 * Collect revenue metrics.
	 *
	 * @param object $collector The wp-prometheus collector instance.
	 * @return void
	 */
	private static function collect_revenue_metrics( $collector ): void {
		$currency = get_option( 'wp_bnb_currency', 'CHF' );

		// Revenue this month.
		$revenue_month_gauge = $collector->register_gauge(
			'wp_bnb_revenue_this_month',
			'Total revenue for the current month',
			array( 'currency' )
		);
		$revenue_month_gauge->set( self::get_revenue_this_month(), array( $currency ) );

		// Revenue year to date.
		$revenue_ytd_gauge = $collector->register_gauge(
			'wp_bnb_revenue_ytd',
			'Total revenue year to date',
			array( 'currency' )
		);
		$revenue_ytd_gauge->set( self::get_revenue_ytd(), array( $currency ) );

		// Average booking value.
		$avg_value_gauge = $collector->register_gauge(
			'wp_bnb_booking_avg_value',
			'Average booking value',
			array( 'currency' )
		);
		$avg_value_gauge->set( self::get_average_booking_value(), array( $currency ) );

		// Revenue from services this month.
		$services_revenue_gauge = $collector->register_gauge(
			'wp_bnb_services_revenue_this_month',
			'Revenue from additional services this month',
			array( 'currency' )
		);
		$services_revenue_gauge->set( self::get_services_revenue_this_month(), array( $currency ) );
	}

	/**
	 * Register Grafana dashboards.
	 *
	 * @param object $provider The wp-prometheus dashboard provider instance.
	 * @return void
	 */
	public static function register_dashboards( $provider ): void {
		$dashboard_file = WP_BNB_PATH . 'assets/grafana/wp-bnb-dashboard.json';

		if ( file_exists( $dashboard_file ) ) {
			$provider->register_dashboard(
				'wp-bnb',
				array(
					'title'       => __( 'WP BnB Dashboard', 'wp-bnb' ),
					'description' => __( 'Monitor occupancy, bookings, revenue, and guest statistics for your B&B.', 'wp-bnb' ),
					'icon'        => 'dashicons-building',
					'file'        => $dashboard_file,
					'plugin'      => 'WP BnB Manager',
				)
			);
		}
	}

	// =========================================================================
	// Helper Methods - Inventory
	// =========================================================================

	/**
	 * Count rooms by status.
	 *
	 * @param string $status Room status.
	 * @return int
	 */
	private static function count_rooms_by_status( string $status ): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_room_status'
				AND pm.meta_value = %s",
				Room::POST_TYPE,
				$status
			)
		);
	}

	/**
	 * Count services by status.
	 *
	 * @param string $status Service status.
	 * @return int
	 */
	private static function count_services_by_status( string $status ): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_service_status'
				AND pm.meta_value = %s",
				Service::POST_TYPE,
				$status
			)
		);
	}

	// =========================================================================
	// Helper Methods - Bookings
	// =========================================================================

	/**
	 * Count bookings by status.
	 *
	 * @param string $status Booking status.
	 * @return int
	 */
	private static function count_bookings_by_status( string $status ): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_booking_status'
				AND pm.meta_value = %s",
				Booking::POST_TYPE,
				$status
			)
		);
	}

	/**
	 * Count today's check-ins.
	 *
	 * @return int
	 */
	private static function count_todays_checkins(): int {
		global $wpdb;
		$today = gmdate( 'Y-m-d' );

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_date ON p.ID = pm_date.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_date.meta_key = '_bnb_booking_check_in'
				AND pm_date.meta_value = %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'pending')",
				Booking::POST_TYPE,
				$today
			)
		);
	}

	/**
	 * Count today's check-outs.
	 *
	 * @return int
	 */
	private static function count_todays_checkouts(): int {
		global $wpdb;
		$today = gmdate( 'Y-m-d' );

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_date ON p.ID = pm_date.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_date.meta_key = '_bnb_booking_check_out'
				AND pm_date.meta_value = %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value = 'checked_in'",
				Booking::POST_TYPE,
				$today
			)
		);
	}

	/**
	 * Count upcoming bookings within given days.
	 *
	 * @param int $days Number of days to look ahead.
	 * @return int
	 */
	private static function count_upcoming_bookings( int $days ): int {
		global $wpdb;
		$today   = gmdate( 'Y-m-d' );
		$end_date = gmdate( 'Y-m-d', strtotime( "+{$days} days" ) );

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_date ON p.ID = pm_date.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_date.meta_key = '_bnb_booking_check_in'
				AND pm_date.meta_value >= %s
				AND pm_date.meta_value <= %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'pending')",
				Booking::POST_TYPE,
				$today,
				$end_date
			)
		);
	}

	/**
	 * Get average booking duration in nights.
	 *
	 * @return float
	 */
	private static function get_average_booking_duration(): float {
		global $wpdb;

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT AVG(DATEDIFF(pm_out.meta_value, pm_in.meta_value))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_out ON p.ID = pm_out.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_out.meta_key = '_bnb_booking_check_out'
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value NOT IN ('cancelled')",
				Booking::POST_TYPE
			)
		);

		return round( (float) $result, 1 );
	}

	// =========================================================================
	// Helper Methods - Guests
	// =========================================================================

	/**
	 * Count guests by status.
	 *
	 * @param string $status Guest status.
	 * @return int
	 */
	private static function count_guests_by_status( string $status ): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_guest_status'
				AND pm.meta_value = %s",
				Guest::POST_TYPE,
				$status
			)
		);
	}

	/**
	 * Count repeat guests (more than one booking).
	 *
	 * @return int
	 */
	private static function count_repeat_guests(): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT pm.meta_value)
				FROM {$wpdb->postmeta} pm
				INNER JOIN {$wpdb->posts} p ON pm.post_id = p.ID
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_booking_guest_id'
				AND pm.meta_value != ''
				GROUP BY pm.meta_value
				HAVING COUNT(*) > 1",
				Booking::POST_TYPE
			)
		);
	}

	/**
	 * Count new guests registered this month.
	 *
	 * @return int
	 */
	private static function count_new_guests_this_month(): int {
		global $wpdb;
		$first_of_month = gmdate( 'Y-m-01 00:00:00' );

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(*)
				FROM {$wpdb->posts}
				WHERE post_type = %s
				AND post_status = 'publish'
				AND post_date >= %s",
				Guest::POST_TYPE,
				$first_of_month
			)
		);
	}

	// =========================================================================
	// Helper Methods - Occupancy
	// =========================================================================

	/**
	 * Get current occupancy rate (percentage of rooms occupied today).
	 *
	 * @return float
	 */
	private static function get_current_occupancy_rate(): float {
		$total_rooms = self::count_available_rooms();
		if ( $total_rooms <= 0 ) {
			return 0.0;
		}

		$occupied = self::count_currently_occupied_rooms();
		return round( ( $occupied / $total_rooms ) * 100, 1 );
	}

	/**
	 * Get monthly occupancy rate.
	 *
	 * @return float
	 */
	private static function get_monthly_occupancy_rate(): float {
		global $wpdb;

		$total_rooms = self::count_available_rooms();
		if ( $total_rooms <= 0 ) {
			return 0.0;
		}

		$first_of_month = gmdate( 'Y-m-01' );
		$today          = gmdate( 'Y-m-d' );
		$days_so_far    = (int) gmdate( 'd' );
		$total_room_nights = $total_rooms * $days_so_far;

		// Count booked nights this month (simplified: count bookings that overlap with this month).
		$booked_nights = (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT SUM(
					DATEDIFF(
						LEAST(pm_out.meta_value, %s),
						GREATEST(pm_in.meta_value, %s)
					)
				)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_out ON p.ID = pm_out.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_out.meta_key = '_bnb_booking_check_out'
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in', 'checked_out')
				AND pm_in.meta_value <= %s
				AND pm_out.meta_value >= %s",
				$today,
				$first_of_month,
				Booking::POST_TYPE,
				$today,
				$first_of_month
			)
		);

		if ( $total_room_nights <= 0 ) {
			return 0.0;
		}

		return round( ( $booked_nights / $total_room_nights ) * 100, 1 );
	}

	/**
	 * Count currently occupied rooms.
	 *
	 * @return int
	 */
	private static function count_currently_occupied_rooms(): int {
		global $wpdb;
		$today = gmdate( 'Y-m-d' );

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT pm_room.meta_value)
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_room ON p.ID = pm_room.post_id
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_out ON p.ID = pm_out.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_room.meta_key = '_bnb_booking_room_id'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_out.meta_key = '_bnb_booking_check_out'
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in')
				AND pm_in.meta_value <= %s
				AND pm_out.meta_value > %s",
				Booking::POST_TYPE,
				$today,
				$today
			)
		);
	}

	/**
	 * Count available rooms (not in maintenance/inactive).
	 *
	 * @return int
	 */
	private static function count_available_rooms(): int {
		global $wpdb;

		return (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT p.ID)
				FROM {$wpdb->posts} p
				LEFT JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id AND pm.meta_key = '_bnb_room_status'
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND (pm.meta_value IS NULL OR pm.meta_value IN ('available', 'occupied'))",
				Room::POST_TYPE
			)
		);
	}

	/**
	 * Get total bed capacity.
	 *
	 * @return int
	 */
	private static function get_total_bed_capacity(): int {
		global $wpdb;

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT SUM(CAST(pm.meta_value AS UNSIGNED))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm.meta_key = '_bnb_room_beds'",
				Room::POST_TYPE
			)
		);

		return (int) $result;
	}

	// =========================================================================
	// Helper Methods - Revenue
	// =========================================================================

	/**
	 * Get revenue for the current month.
	 *
	 * @return float
	 */
	private static function get_revenue_this_month(): float {
		global $wpdb;
		$first_of_month = gmdate( 'Y-m-01' );

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT SUM(CAST(pm_price.meta_value AS DECIMAL(10,2)))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_price ON p.ID = pm_price.post_id
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_price.meta_key = '_bnb_booking_total_price'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_in.meta_value >= %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in', 'checked_out')",
				Booking::POST_TYPE,
				$first_of_month
			)
		);

		return round( (float) $result, 2 );
	}

	/**
	 * Get revenue year to date.
	 *
	 * @return float
	 */
	private static function get_revenue_ytd(): float {
		global $wpdb;
		$first_of_year = gmdate( 'Y-01-01' );

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT SUM(CAST(pm_price.meta_value AS DECIMAL(10,2)))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_price ON p.ID = pm_price.post_id
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_price.meta_key = '_bnb_booking_total_price'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_in.meta_value >= %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in', 'checked_out')",
				Booking::POST_TYPE,
				$first_of_year
			)
		);

		return round( (float) $result, 2 );
	}

	/**
	 * Get average booking value.
	 *
	 * @return float
	 */
	private static function get_average_booking_value(): float {
		global $wpdb;

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT AVG(CAST(pm_price.meta_value AS DECIMAL(10,2)))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_price ON p.ID = pm_price.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_price.meta_key = '_bnb_booking_total_price'
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in', 'checked_out')",
				Booking::POST_TYPE
			)
		);

		return round( (float) $result, 2 );
	}

	/**
	 * Get revenue from services this month.
	 *
	 * @return float
	 */
	private static function get_services_revenue_this_month(): float {
		global $wpdb;
		$first_of_month = gmdate( 'Y-m-01' );

		$result = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT SUM(CAST(pm_services.meta_value AS DECIMAL(10,2)))
				FROM {$wpdb->posts} p
				INNER JOIN {$wpdb->postmeta} pm_services ON p.ID = pm_services.post_id
				INNER JOIN {$wpdb->postmeta} pm_in ON p.ID = pm_in.post_id
				INNER JOIN {$wpdb->postmeta} pm_status ON p.ID = pm_status.post_id
				WHERE p.post_type = %s
				AND p.post_status = 'publish'
				AND pm_services.meta_key = '_bnb_booking_services_total'
				AND pm_in.meta_key = '_bnb_booking_check_in'
				AND pm_in.meta_value >= %s
				AND pm_status.meta_key = '_bnb_booking_status'
				AND pm_status.meta_value IN ('confirmed', 'checked_in', 'checked_out')",
				Booking::POST_TYPE,
				$first_of_month
			)
		);

		return round( (float) $result, 2 );
	}
}