<?php
/**
 * Service 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 a service (and optional duration / attendees).
 *
 * @since 0.1.0
 */
final class ServiceStep extends AbstractStep {

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

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

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

	/**
	 * Whether the step should be skipped.
	 *
	 * @param BookingSession $session Session.
	 */
	public function should_skip( BookingSession $session ): bool {
		unset( $session );
		return false;
	}

	/**
	 * Build the step descriptor.
	 *
	 * @param BookingSession $session Session.
	 */
	public function descriptor( BookingSession $session ): StepDescriptor {
		return $this->build_descriptor(
			$session,
			[],
			[
				[
					'key'      => 'service_id',
					'type'     => 'integer',
					'required' => true,
				],
				[
					'key'      => 'duration_id',
					'type'     => 'integer',
					'required' => false,
				],
				[
					'key'      => 'attendees',
					'type'     => 'integer',
					'required' => false,
				],
				[
					'key'      => 'price_minor',
					'type'     => 'integer',
					'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 );
		$errors = [];
		if ( null === $this->positive_int( $input, 'service_id' ) ) {
			$errors['service_id'] = 'Please choose a service.';
		}
		if ( isset( $input['attendees'] ) && (int) $input['attendees'] < 1 ) {
			$errors['attendees'] = 'Attendees must be at least 1.';
		}
		return [] === $errors ? ValidationResult::ok() : ValidationResult::invalid( $errors );
	}

	/**
	 * Apply validated input.
	 *
	 * @param BookingSession       $session Session.
	 * @param array<string, mixed> $input   Payload.
	 */
	public function apply( BookingSession $session, array $input ): BookingSession {
		$service_id  = (int) $input['service_id'];
		$duration_id = $this->positive_int( $input, 'duration_id' );
		$attendees   = isset( $input['attendees'] ) ? max( 1, (int) $input['attendees'] ) : 1;
		$price       = isset( $input['price_minor'] ) ? max( 0, (int) $input['price_minor'] ) : $session->draft()->price_minor();
		$currency    = $this->string_value( $input, 'currency' ) ?? $session->draft()->currency();
		$draft       = $session->draft()->with_service( $service_id, $duration_id, $attendees, $price, $currency );
		$totals      = $session->totals();
		$totals['subtotal_minor'] = $price;
		$totals['total_minor']    = $price;
		$totals['due_now_minor']  = $price;
		$totals['currency']       = $currency;
		return $session->with_draft( $draft )->with_totals( $totals );
	}
}