<?php
/**
 * Cart review 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;

/**
 * Review cart, add another, apply coupon — skipped when cart disabled.
 *
 * @since 0.1.0
 */
final class CartStep extends AbstractStep {

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

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

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

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

	/**
	 * Build the step descriptor.
	 *
	 * @param BookingSession $session Session.
	 */
	public function descriptor( BookingSession $session ): StepDescriptor {
		return $this->build_descriptor(
			$session,
			[
				'cart_item_count' => count( $session->cart() ),
				'has_draft'       => null !== $session->draft()->service_id(),
			],
			[
				[
					'key'      => 'coupon_code',
					'type'     => 'string',
					'required' => false,
				],
				[
					'key'      => 'commit_draft',
					'type'     => 'boolean',
					'required' => false,
				],
			]
		);
	}

	/**
	 * Validate submitted input.
	 *
	 * @param BookingSession       $session Session.
	 * @param array<string, mixed> $input   Payload.
	 */
	public function validate( BookingSession $session, array $input ): ValidationResult {
		unset( $input );
		if ( null === $session->draft()->service_id() && [] === $session->cart() ) {
			return ValidationResult::invalid( [], [ 'Your cart is empty.' ] );
		}
		return ValidationResult::ok();
	}

	/**
	 * Apply validated input.
	 *
	 * @param BookingSession       $session Session.
	 * @param array<string, mixed> $input   Payload.
	 */
	public function apply( BookingSession $session, array $input ): BookingSession {
		$coupon = $this->string_value( $input, 'coupon_code' );
		$next   = null !== $coupon ? $session->with_coupon_code( $coupon ) : $session;
		$commit = isset( $input['commit_draft'] ) && true === $input['commit_draft'];
		if ( $commit && null !== $next->draft()->service_id() ) {
			$cart   = $next->cart();
			$cart[] = $next->draft();
			$next   = $next->with_cart( $cart );
		}
		return $next;
	}
}