Add booking system with calendar and email notifications (v0.3.0)

- Booking Custom Post Type with full management features
- Room and guest relationship tracking
- Check-in/check-out date management with validation
- Booking status workflow (pending, confirmed, checked_in, checked_out, cancelled)
- Automatic price calculation using existing Calculator
- Availability system with real-time conflict detection
- AJAX endpoint for instant availability validation
- Calendar admin page with monthly view and room/building filters
- Color-coded booking status display with legend
- Email notifications for new bookings, confirmations, and cancellations
- HTML email templates with placeholder-based system
- Auto-generated booking references (BNB-YYYY-NNNNN)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/Plugin.php

@@ -9,8 +9,12 @@ declare( strict_types=1 );
 
 namespace Magdev\WpBnb;
 
+use Magdev\WpBnb\Admin\Calendar as CalendarAdmin;
 use Magdev\WpBnb\Admin\Seasons as SeasonsAdmin;
+use Magdev\WpBnb\Booking\Availability;
+use Magdev\WpBnb\Booking\EmailNotifier;
 use Magdev\WpBnb\License\Manager as LicenseManager;
+use Magdev\WpBnb\PostTypes\Booking;
 use Magdev\WpBnb\PostTypes\Building;
 use Magdev\WpBnb\PostTypes\Room;
 use Magdev\WpBnb\Pricing\Season;
@@ -87,6 +91,7 @@ final class Plugin {
 	private function register_post_types(): void {
 		Building::init();
 		Room::init();
+		Booking::init();
 	}
 
 	/**
@@ -132,6 +137,15 @@ final class Plugin {
 
 		// Initialize seasons admin page.
 		SeasonsAdmin::init();
+
+		// Initialize calendar admin page.
+		CalendarAdmin::init();
+
+		// Initialize email notifier.
+		EmailNotifier::init();
+
+		// Register AJAX handlers.
+		add_action( 'wp_ajax_wp_bnb_check_availability', array( $this, 'ajax_check_availability' ) );
 	}
 
 	/**
@@ -167,7 +181,7 @@ final class Plugin {
 
 		// Check if we're on plugin pages or editing our custom post types.
 		$is_plugin_page   = strpos( $hook_suffix, 'wp-bnb' ) !== false;
-		$is_our_post_type = in_array( $post_type, array( Building::POST_TYPE, Room::POST_TYPE ), true );
+		$is_our_post_type = in_array( $post_type, array( Building::POST_TYPE, Room::POST_TYPE, Booking::POST_TYPE ), true );
 		$is_edit_screen   = in_array( $hook_suffix, array( 'post.php', 'post-new.php' ), true );
 
 		if ( ! $is_plugin_page && ! ( $is_our_post_type && $is_edit_screen ) ) {
@@ -205,15 +219,22 @@ final class Plugin {
 				'nonce'    => wp_create_nonce( 'wp_bnb_admin_nonce' ),
 				'postType' => $post_type,
 				'i18n'     => array(
-					'validating'       => __( 'Validating...', 'wp-bnb' ),
-					'activating'       => __( 'Activating...', 'wp-bnb' ),
-					'error'            => __( 'An error occurred. Please try again.', 'wp-bnb' ),
-					'selectImages'     => __( 'Select Images', 'wp-bnb' ),
-					'addToGallery'     => __( 'Add to Gallery', 'wp-bnb' ),
-					'confirmRemove'    => __( 'Are you sure you want to remove this image?', 'wp-bnb' ),
-					'increase'         => __( 'increase', 'wp-bnb' ),
-					'discount'         => __( 'discount', 'wp-bnb' ),
-					'normalPrice'      => __( 'Normal price', 'wp-bnb' ),
+					'validating'         => __( 'Validating...', 'wp-bnb' ),
+					'activating'         => __( 'Activating...', 'wp-bnb' ),
+					'error'              => __( 'An error occurred. Please try again.', 'wp-bnb' ),
+					'selectImages'       => __( 'Select Images', 'wp-bnb' ),
+					'addToGallery'       => __( 'Add to Gallery', 'wp-bnb' ),
+					'confirmRemove'      => __( 'Are you sure you want to remove this image?', 'wp-bnb' ),
+					'increase'           => __( 'increase', 'wp-bnb' ),
+					'discount'           => __( 'discount', 'wp-bnb' ),
+					'normalPrice'        => __( 'Normal price', 'wp-bnb' ),
+					'checking'           => __( 'Checking availability...', 'wp-bnb' ),
+					'available'          => __( 'Available', 'wp-bnb' ),
+					'notAvailable'       => __( 'Not available - conflicts with existing booking', 'wp-bnb' ),
+					'selectRoomAndDates' => __( 'Select room and dates to check availability', 'wp-bnb' ),
+					'nights'             => __( 'nights', 'wp-bnb' ),
+					'night'              => __( 'night', 'wp-bnb' ),
+					'calculating'        => __( 'Calculating price...', 'wp-bnb' ),
 				),
 			)
 		);
@@ -817,6 +838,43 @@ final class Plugin {
 		settings_errors( 'wp_bnb_settings' );
 	}
 
+	/**
+	 * AJAX handler for checking room availability.
+	 *
+	 * @return void
+	 */
+	public function ajax_check_availability(): void {
+		check_ajax_referer( 'wp_bnb_admin_nonce', 'nonce' );
+
+		if ( ! current_user_can( 'edit_posts' ) ) {
+			wp_send_json_error(
+				array( 'message' => __( 'You do not have permission to perform this action.', 'wp-bnb' ) )
+			);
+		}
+
+		$room_id   = isset( $_POST['room_id'] ) ? absint( $_POST['room_id'] ) : 0;
+		$check_in  = isset( $_POST['check_in'] ) ? sanitize_text_field( wp_unslash( $_POST['check_in'] ) ) : '';
+		$check_out = isset( $_POST['check_out'] ) ? sanitize_text_field( wp_unslash( $_POST['check_out'] ) ) : '';
+		$exclude   = isset( $_POST['exclude_booking'] ) ? absint( $_POST['exclude_booking'] ) : null;
+
+		if ( ! $room_id || ! $check_in || ! $check_out ) {
+			wp_send_json_error(
+				array( 'message' => __( 'Missing required parameters.', 'wp-bnb' ) )
+			);
+		}
+
+		// Validate dates.
+		if ( strtotime( $check_out ) <= strtotime( $check_in ) ) {
+			wp_send_json_error(
+				array( 'message' => __( 'Check-out date must be after check-in date.', 'wp-bnb' ) )
+			);
+		}
+
+		$result = Availability::check_availability_with_price( $room_id, $check_in, $check_out, $exclude );
+
+		wp_send_json_success( $result );
+	}
+
 	/**
 	 * Get Twig environment.
 	 *