Extend availability (durations, weekly recurrence, calendar); price offerings in dollars

Availability (#2):
- us_availability gains offering_id, duration_minutes (default 60), and
  recurrence_group; AvailabilitySlot carries the new fields.
- AvailabilityRepository::createWeeklySeries() generates N weekly rows
  sharing a recurrence_group; findAvailable() filters by offering and
  duration. Date math uses DateTimeImmutable::modify() (the no-debug CI
  regex `dd\(` matches `->add(`).
- REST GET filters by offering_id/duration_minutes; POST accepts
  duration_minutes, offering_id, recurrence (single|weekly) + weeks.
- Admin form adds duration, an offering picker, and one-off/weekly options
  (OfferingRepository wired into AvailabilityController).
- booking.js renders an agenda calendar (slots grouped by day, with
  duration). The richer booking UX lands with the booking-flow work.

Offering price in dollars:
- Switch us_offerings.price_cents (INT) to price DECIMAL(10,2); Offering
  uses float $price. Admin form and REST take dollars.
- Fix a pre-existing misalignment in the Offering insert/update $wpdb
  format arrays (billing_mode/capacity/is_active were mapped to the wrong
  specifiers, which would corrupt values) via a single COLUMN_FORMATS list.

Also bump PHPStan to --memory-limit=1G in the lint script; 128M now
crashes analysis as the codebase has grown.

Refs #2

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/Availability/AvailabilityController.php

@@ -4,10 +4,15 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Availability;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Offering\Offering;
+use Unsupervised\Schedular\Offering\OfferingRepository;
 
 class AvailabilityController {
 
-	public function __construct( private AvailabilityRepository $repository ) {}
+	public function __construct(
+		private AvailabilityRepository $repository,
+		private OfferingRepository $offerings,
+	) {}
 
 	public function renderPage(): void {
 		if ( ! current_user_can( RoleManager::CAP_MANAGE_AVAILABILITY ) ) {
@@ -20,7 +25,8 @@ class AvailabilityController {
 			$this->handleFormAction( $instructorId );
 		}
 
-		$slots = $this->repository->findByInstructor( $instructorId );
+		$slots           = $this->repository->findByInstructor( $instructorId );
+		$offeringChoices = $this->offerings->findAll( $instructorId, Offering::KIND_PRIVATE_LESSON, true );
 
 		include USC_PLUGIN_DIR . 'templates/admin/availability.php';
 	}
@@ -31,12 +37,7 @@ class AvailabilityController {
 		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
 
 		if ( 'add' === $action ) {
-			$startDt = sanitize_text_field( wp_unslash( $_POST['start_dt'] ?? '' ) );
-			$endDt   = sanitize_text_field( wp_unslash( $_POST['end_dt'] ?? '' ) );
-
-			if ( '' !== $startDt && '' !== $endDt ) {
-				$this->repository->insert( new AvailabilitySlot( $instructorId, $startDt, $endDt ) );
-			}
+			$this->addSlot( $instructorId );
 		}
 
 		if ( 'delete' === $action ) {
@@ -50,4 +51,33 @@ class AvailabilityController {
 		}
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 	}
+
+	private function addSlot( int $instructorId ): void {
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		$startDt = sanitize_text_field( wp_unslash( $_POST['start_dt'] ?? '' ) );
+		$endDt   = sanitize_text_field( wp_unslash( $_POST['end_dt'] ?? '' ) );
+
+		if ( '' === $startDt || '' === $endDt ) {
+			return;
+		}
+
+		$offeringId = absint( $_POST['offering_id'] ?? 0 );
+		$duration   = absint( $_POST['duration_minutes'] ?? 0 );
+
+		$slot = new AvailabilitySlot(
+			instructorId:    $instructorId,
+			startDt:         $startDt,
+			endDt:           $endDt,
+			durationMinutes: $duration > 0 ? $duration : 60,
+			offeringId:      $offeringId > 0 ? $offeringId : null,
+		);
+
+		if ( 'weekly' === sanitize_key( wp_unslash( $_POST['recurrence'] ?? 'single' ) ) ) {
+			$this->repository->createWeeklySeries( $slot, absint( $_POST['weeks'] ?? 1 ) );
+			return;
+		}
+
+		$this->repository->insert( $slot );
+		// phpcs:enable WordPress.Security.NonceVerification.Missing
+	}
 }