wp-bnb/src/Admin/Calendar.php

<?php
/**
 * Calendar admin page.
 *
 * Displays availability calendar for rooms and buildings.
 *
 * @package Magdev\WpBnb\Admin
 */

declare( strict_types=1 );

namespace Magdev\WpBnb\Admin;

use Magdev\WpBnb\Booking\Availability;
use Magdev\WpBnb\PostTypes\Booking;
use Magdev\WpBnb\PostTypes\Building;
use Magdev\WpBnb\PostTypes\Room;

/**
 * Calendar admin page class.
 */
final class Calendar {

	/**
	 * Initialize the calendar page.
	 *
	 * @return void
	 */
	public static function init(): void {
		add_action( 'admin_menu', array( self::class, 'register_menu' ) );
	}

	/**
	 * Register the admin menu item.
	 *
	 * @return void
	 */
	public static function register_menu(): void {
		add_submenu_page(
			'wp-bnb',
			__( 'Calendar', 'wp-bnb' ),
			__( 'Calendar', 'wp-bnb' ),
			'edit_posts',
			'wp-bnb-calendar',
			array( self::class, 'render_page' )
		);
	}

	/**
	 * Render the calendar page.
	 *
	 * @return void
	 */
	public static function render_page(): void {
		// Get filter parameters.
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only page.
		$building_id = isset( $_GET['building_id'] ) ? absint( $_GET['building_id'] ) : 0;
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only page.
		$room_id = isset( $_GET['room_id'] ) ? absint( $_GET['room_id'] ) : 0;
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only page.
		$year = isset( $_GET['year'] ) ? absint( $_GET['year'] ) : (int) gmdate( 'Y' );
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only page.
		$month = isset( $_GET['month'] ) ? absint( $_GET['month'] ) : (int) gmdate( 'n' );

		// Validate month.
		if ( $month < 1 || $month > 12 ) {
			$month = (int) gmdate( 'n' );
		}

		// Get buildings and rooms for filters.
		$buildings = get_posts(
			array(
				'post_type'      => Building::POST_TYPE,
				'post_status'    => 'publish',
				'posts_per_page' => -1,
				'orderby'        => 'title',
				'order'          => 'ASC',
			)
		);

		$rooms = get_posts(
			array(
				'post_type'      => Room::POST_TYPE,
				'post_status'    => 'publish',
				'posts_per_page' => -1,
				'orderby'        => 'title',
				'order'          => 'ASC',
			)
		);

		// If room is selected, get its building.
		if ( $room_id && ! $building_id ) {
			$building = Room::get_building( $room_id );
			if ( $building ) {
				$building_id = $building->ID;
			}
		}

		// Get rooms to display.
		$display_rooms = array();
		if ( $room_id ) {
			$room = get_post( $room_id );
			if ( $room ) {
				$display_rooms[] = $room;
			}
		} elseif ( $building_id ) {
			$display_rooms = Room::get_rooms_for_building( $building_id );
		} else {
			$display_rooms = $rooms;
		}

		// Calculate navigation dates.
		$prev_month = $month === 1 ? 12 : $month - 1;
		$prev_year  = $month === 1 ? $year - 1 : $year;
		$next_month = $month === 12 ? 1 : $month + 1;
		$next_year  = $month === 12 ? $year + 1 : $year;

		$month_name = gmdate( 'F', mktime( 0, 0, 0, $month, 1, $year ) );

		?>
		<div class="wrap">
			<h1><?php esc_html_e( 'Availability Calendar', 'wp-bnb' ); ?></h1>

			<div class="bnb-calendar-container">
				<!-- Calendar Header -->
				<div class="bnb-calendar-header">
					<div class="bnb-calendar-nav">
						<a href="<?php echo esc_url( self::get_calendar_url( $prev_year, $prev_month, $building_id, $room_id ) ); ?>"
						   class="button">
							&laquo; <?php esc_html_e( 'Previous', 'wp-bnb' ); ?>
						</a>
						<a href="<?php echo esc_url( self::get_calendar_url( (int) gmdate( 'Y' ), (int) gmdate( 'n' ), $building_id, $room_id ) ); ?>"
						   class="button">
							<?php esc_html_e( 'Today', 'wp-bnb' ); ?>
						</a>
						<a href="<?php echo esc_url( self::get_calendar_url( $next_year, $next_month, $building_id, $room_id ) ); ?>"
						   class="button">
							<?php esc_html_e( 'Next', 'wp-bnb' ); ?> &raquo;
						</a>
					</div>
					<h2><?php echo esc_html( $month_name . ' ' . $year ); ?></h2>
					<div></div>
				</div>

				<!-- Filters -->
				<div class="bnb-calendar-filters">
					<form method="get" action="">
						<input type="hidden" name="page" value="wp-bnb-calendar">
						<input type="hidden" name="year" value="<?php echo esc_attr( $year ); ?>">
						<input type="hidden" name="month" value="<?php echo esc_attr( $month ); ?>">

						<label>
							<?php esc_html_e( 'Building:', 'wp-bnb' ); ?>
							<select name="building_id" onchange="this.form.submit()">
								<option value=""><?php esc_html_e( 'All Buildings', 'wp-bnb' ); ?></option>
								<?php foreach ( $buildings as $building ) : ?>
									<option value="<?php echo esc_attr( $building->ID ); ?>" <?php selected( $building_id, $building->ID ); ?>>
										<?php echo esc_html( $building->post_title ); ?>
									</option>
								<?php endforeach; ?>
							</select>
						</label>

						<label>
							<?php esc_html_e( 'Room:', 'wp-bnb' ); ?>
							<select name="room_id" onchange="this.form.submit()">
								<option value=""><?php esc_html_e( 'All Rooms', 'wp-bnb' ); ?></option>
								<?php foreach ( $rooms as $room ) : ?>
									<?php
									$room_building = Room::get_building( $room->ID );
									$room_label    = $room->post_title;
									if ( $room_building ) {
										$room_label .= ' (' . $room_building->post_title . ')';
									}
									?>
									<option value="<?php echo esc_attr( $room->ID ); ?>" <?php selected( $room_id, $room->ID ); ?>>
										<?php echo esc_html( $room_label ); ?>
									</option>
								<?php endforeach; ?>
							</select>
						</label>
					</form>
				</div>

				<!-- Calendar Grid -->
				<div class="bnb-calendar-grid">
					<?php if ( empty( $display_rooms ) ) : ?>
						<div class="bnb-no-rooms">
							<span class="dashicons dashicons-calendar-alt"></span>
							<p><?php esc_html_e( 'No rooms found. Please add rooms first.', 'wp-bnb' ); ?></p>
							<a href="<?php echo esc_url( admin_url( 'post-new.php?post_type=' . Room::POST_TYPE ) ); ?>" class="button button-primary">
								<?php esc_html_e( 'Add Room', 'wp-bnb' ); ?>
							</a>
						</div>
					<?php else : ?>
						<?php self::render_calendar_table( $display_rooms, $year, $month, (bool) $room_id ); ?>
					<?php endif; ?>
				</div>

				<!-- Legend -->
				<div class="bnb-calendar-legend">
					<div class="bnb-calendar-legend-item">
						<span class="bnb-calendar-legend-color available"></span>
						<?php esc_html_e( 'Available', 'wp-bnb' ); ?>
					</div>
					<div class="bnb-calendar-legend-item">
						<span class="bnb-calendar-legend-color pending"></span>
						<?php esc_html_e( 'Pending', 'wp-bnb' ); ?>
					</div>
					<div class="bnb-calendar-legend-item">
						<span class="bnb-calendar-legend-color confirmed"></span>
						<?php esc_html_e( 'Confirmed', 'wp-bnb' ); ?>
					</div>
					<div class="bnb-calendar-legend-item">
						<span class="bnb-calendar-legend-color checked-in"></span>
						<?php esc_html_e( 'Checked In', 'wp-bnb' ); ?>
					</div>
				</div>
			</div>
		</div>
		<?php
	}

	/**
	 * Render the calendar table.
	 *
	 * @param array $rooms      Rooms to display.
	 * @param int   $year       Year.
	 * @param int   $month      Month.
	 * @param bool  $single_room Whether showing single room (more detail).
	 * @return void
	 */
	private static function render_calendar_table( array $rooms, int $year, int $month, bool $single_room = false ): void {
		$days_in_month = (int) gmdate( 't', mktime( 0, 0, 0, $month, 1, $year ) );
		$today         = gmdate( 'Y-m-d' );

		$class = $single_room ? 'bnb-calendar-table bnb-calendar-single-room' : 'bnb-calendar-table';
		?>
		<table class="<?php echo esc_attr( $class ); ?>">
			<thead>
				<tr>
					<th class="room-header"><?php esc_html_e( 'Room', 'wp-bnb' ); ?></th>
					<?php for ( $day = 1; $day <= $days_in_month; $day++ ) : ?>
						<?php
						$date_str    = sprintf( '%04d-%02d-%02d', $year, $month, $day );
						$day_of_week = gmdate( 'D', strtotime( $date_str ) );
						$is_weekend  = in_array( gmdate( 'N', strtotime( $date_str ) ), array( 6, 7 ), true );
						?>
						<th class="<?php echo $is_weekend ? 'weekend' : ''; ?>">
							<?php echo esc_html( $day ); ?><br>
							<small><?php echo esc_html( $day_of_week ); ?></small>
						</th>
					<?php endfor; ?>
				</tr>
			</thead>
			<tbody>
				<?php foreach ( $rooms as $room ) : ?>
					<?php
					$room_number   = get_post_meta( $room->ID, '_bnb_room_room_number', true );
					$room_building = Room::get_building( $room->ID );
					$booked_dates  = Availability::get_booked_dates( $room->ID, $year, $month );
					?>
					<tr>
						<td class="bnb-calendar-room">
							<a href="<?php echo esc_url( get_edit_post_link( $room->ID ) ); ?>">
								<?php echo esc_html( $room->post_title ); ?>
								<?php if ( $room_number ) : ?>
									<span class="room-number">#<?php echo esc_html( $room_number ); ?></span>
								<?php endif; ?>
							</a>
							<?php if ( $room_building ) : ?>
								<span class="building-name"><?php echo esc_html( $room_building->post_title ); ?></span>
							<?php endif; ?>
						</td>
						<?php for ( $day = 1; $day <= $days_in_month; $day++ ) : ?>
							<?php
							$date_str  = sprintf( '%04d-%02d-%02d', $year, $month, $day );
							$is_past   = $date_str < $today;
							$is_today  = $date_str === $today;
							$is_booked = isset( $booked_dates[ $date_str ] );

							$classes = array( 'bnb-calendar-day' );
							$title   = '';
							$booking_id = 0;

							if ( $is_past ) {
								$classes[] = 'past';
							}
							if ( $is_today ) {
								$classes[] = 'today';
							}

							if ( $is_booked ) {
								$booking_data = $booked_dates[ $date_str ];
								$booking_id   = $booking_data['booking_id'];
								$classes[]    = 'booked';
								$classes[]    = 'status-' . $booking_data['status'];

								if ( $booking_data['is_start'] ) {
									$classes[] = 'booked-start';
								}
								if ( $booking_data['is_end'] ) {
									$classes[] = 'booked-end';
								}

								$title = sprintf(
									/* translators: 1: Booking reference, 2: Guest name, 3: Check-in date, 4: Check-out date */
									__( '%1$s - %2$s (%3$s to %4$s)', 'wp-bnb' ),
									$booking_data['reference'],
									$booking_data['guest'],
									wp_date( get_option( 'date_format' ), strtotime( $booking_data['check_in'] ) ),
									wp_date( get_option( 'date_format' ), strtotime( $booking_data['check_out'] ) )
								);
							} elseif ( ! $is_past ) {
								$classes[] = 'available';
							}
							?>
							<td class="<?php echo esc_attr( implode( ' ', $classes ) ); ?>"
								<?php if ( $booking_id ) : ?>
									data-booking-id="<?php echo esc_attr( $booking_id ); ?>"
								<?php endif; ?>
								<?php if ( $title ) : ?>
									title="<?php echo esc_attr( $title ); ?>"
								<?php endif; ?>>
								<?php if ( $single_room && $is_booked && $booking_data['is_start'] ) : ?>
									<span class="guest-name"><?php echo esc_html( $booking_data['guest'] ); ?></span>
								<?php endif; ?>
							</td>
						<?php endfor; ?>
					</tr>
				<?php endforeach; ?>
			</tbody>
		</table>
		<?php
	}

	/**
	 * Get calendar URL with parameters.
	 *
	 * @param int $year        Year.
	 * @param int $month       Month.
	 * @param int $building_id Building ID (optional).
	 * @param int $room_id     Room ID (optional).
	 * @return string URL.
	 */
	private static function get_calendar_url( int $year, int $month, int $building_id = 0, int $room_id = 0 ): string {
		$args = array(
			'page'  => 'wp-bnb-calendar',
			'year'  => $year,
			'month' => $month,
		);

		if ( $building_id ) {
			$args['building_id'] = $building_id;
		}

		if ( $room_id ) {
			$args['room_id'] = $room_id;
		}

		return add_query_arg( $args, admin_url( 'admin.php' ) );
	}
}