<?php

declare(strict_types=1);

namespace App\Form\Service\Condition;

use App\Form\Model\BookingDto;
use App\Form\Service\Contract\FieldConditionInterface;

/**
 * Condition that checks if the participant is the first participant (index 0).
 *
 * This is used to apply field state logic specifically for the first participant
 * in the booking, such as requiring address fields or showing DOB-dependent fields.
 *
 * Note: This checks if the participant is at index 0, NOT if they are the "applicant"
 * in the BPN sense (the logged-in user). For agency-initiated bookings, the first
 * participant may be different from the applicant/logged-in user.
 */
class FirstParticipantCondition implements FieldConditionInterface
{
    /**
     * Evaluates if the participant is the first participant.
     *
     * @param BookingDto           $bookingDto       The current booking data
     * @param int                  $participantIndex The index of the participant being evaluated
     * @param array<string, mixed> $formData         Current form data (unused)
     *
     * @return bool True if the participant is the first participant (index 0)
     */
    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
    {
        return 0 === $participantIndex;
    }

    public function getDependentFields(): array
    {
        return [];
    }

    public function getDescription(): string
    {
        return 'Checks if the participant is the first participant (index 0)';
    }
}