<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Guardian;

use Unsupervised\Schedular\Val;

/**
 * One parent/guardian ↔ child link. The child is a real (login-less) WordPress
 * user, so `studentId` is a `wp_users` ID exactly like every other student id in
 * the schema — this row only records who books and pays on their behalf.
 */
class GuardianLink {

	public function __construct(
		public readonly int $guardianId,
		public readonly int $studentId,
		public readonly string $relationship = '',
		public readonly ?string $createdAt = null,
		public readonly ?int $id = null,
	) {}

	public static function fromRow( \stdClass $row ): self {
		return new self(
			guardianId:   Val::int( $row->guardian_id ),
			studentId:    Val::int( $row->student_id ),
			relationship: Val::string( $row->relationship ?? '' ),
			createdAt:    Val::stringOrNull( $row->created_at ?? null ),
			id:           Val::int( $row->id ),
		);
	}

	/**
	 * Returns a plain array representation of the link.
	 *
	 * @return array<string, mixed>
	 */
	public function toArray(): array {
		return [
			'id'           => $this->id,
			'guardian_id'  => $this->guardianId,
			'student_id'   => $this->studentId,
			'relationship' => $this->relationship,
			'created_at'   => $this->createdAt,
		];
	}
}