<?php

declare(strict_types=1);

namespace App\Form\Service\Condition;

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

/**
 * Condition that evaluates whether a participant is eligible for booking.
 *
 * A participant is considered ineligible when no skipass is available for their age.
 * When this condition is met (participant is ineligible), all service fields should
 * be hidden and replaced with an ineligibility message.
 *
 * This prevents underaged participants from booking when the travel has no appropriate
 * skipasses for their age group. Since skipasses are mandatory for booking, having no
 * available skipasses means the participant cannot complete the booking process.
 *
 * The condition is satisfied when:
 * 1. Participant has provided date of birth
 * 2. No skipasses are available for the participant's age at travel date
 */
class BookingEligibilityCondition implements FieldConditionInterface
{
    public function __construct(
        private readonly ParticipantEligibilityService $participantEligibilityService,
    ) {
    }

    /**
     * Evaluates if a participant is ineligible for booking.
     *
     * Returns true when the participant is INELIGIBLE (should hide service fields).
     * Returns false when the participant is eligible (show normal form fields).
     *
     * @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 for condition evaluation
     *
     * @return bool True if participant is ineligible (no skipasses available for their age)
     */
    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
    {
        // Invert the eligibility check since conditions typically evaluate to TRUE for "hide"
        // isParticipantEligible() returns TRUE when eligible, we need TRUE when INELIGIBLE
        return !$this->participantEligibilityService->isParticipantEligible($bookingDto, $participantIndex);
    }

    /**
     * Returns field names that this condition depends on.
     *
     * This condition depends on the dateOfBirth field since eligibility
     * is determined by age-based skipass availability.
     *
     * @return string[] Array containing field names this condition depends on
     */
    public function getDependentFields(): array
    {
        return ['dateOfBirth'];
    }

    /**
     * Returns a human-readable description of this condition.
     *
     * @return string Description of the booking eligibility condition
     */
    public function getDescription(): string
    {
        return 'Participant has no available skipasses for their age';
    }
}