<?php
/**
 * Extras selection step.
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Steps\Core;

use Bookline\Domain\Steps\BookingSession;
use Bookline\Domain\Steps\StepDescriptor;
use Bookline\Domain\Steps\ValidationResult;

/**
 * Choose priced extras — skipped when none are available.
 *
 * @since 0.1.0
 */
final class ExtrasStep extends AbstractStep {

	/**
	 * Step name.
	 */
	public function name(): string {
		return 'extras';
	}

	/**
	 * Progress label.
	 */
	public function label(): string {
		return 'Extras';
	}

	/**
	 * Front-end component key.
	 */
	protected function component(): string {
		return 'extras_picker';
	}

	/**
	 * Whether the step should be skipped.
	 *
	 * @param BookingSession $session Session.
	 */
	public function should_skip( BookingSession $session ): bool {
		return $session->form()->available_extras_count() <= 0;
	}

	/**
	 * Build the step descriptor.
	 *
	 * @param BookingSession $session Session.
	 */
	public function descriptor( BookingSession $session ): StepDescriptor {
		return $this->build_descriptor(
			$session,
			[ 'available_count' => $session->form()->available_extras_count() ],
			[
				[
					'key'      => 'extras',
					'type'     => 'array',
					'required' => false,
				],
			]
		);
	}

	/**
	 * Validate submitted input.
	 *
	 * @param BookingSession       $session Session.
	 * @param array<string, mixed> $input   Payload.
	 */
	public function validate( BookingSession $session, array $input ): ValidationResult {
		unset( $session );
		if ( isset( $input['extras'] ) && ! is_array( $input['extras'] ) ) {
			return ValidationResult::invalid( [ 'extras' => 'Extras must be a list.' ] );
		}
		return ValidationResult::ok();
	}

	/**
	 * Apply validated input.
	 *
	 * @param BookingSession       $session Session.
	 * @param array<string, mixed> $input   Payload.
	 */
	public function apply( BookingSession $session, array $input ): BookingSession {
		$extras = isset( $input['extras'] ) && is_array( $input['extras'] ) ? array_values( $input['extras'] ) : [];
		$clean  = [];
		foreach ( $extras as $extra ) {
			if ( ! is_array( $extra ) ) {
				continue;
			}
			$id = (int) ( $extra['extra_id'] ?? $extra['id'] ?? 0 );
			if ( $id < 1 ) {
				continue;
			}
			$qty = isset( $extra['quantity'] ) ? max( 1, (int) $extra['quantity'] ) : 1;
			$clean[] = [
				'extra_id' => $id,
				'quantity' => $qty,
			];
		}
		$draft = $session->draft()->with_extras( $clean, $session->draft()->price_minor() );
		return $session->with_draft( $draft );
	}
}