<?php

declare(strict_types=1);

namespace App\Form\Service\Condition;

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

/**
 * Condition that determines if the first participant's personal data should be read-only.
 *
 * This condition evaluates read-only state based on agency type and authentication state,
 * replacing the previous personId-based detection with agency code-based detection.
 *
 * Business Rules:
 * - CREATE mode (anonymous user): First participant data is editable (user must fill it in)
 * - CREATE mode (logged-in, non-internal agency): First participant = applicant, data is read-only
 * - CREATE mode (logged-in, internal agency): First participant ≠ applicant, data is editable
 * - EDIT mode (internal agency): First participant ≠ applicant, data is editable (mutability applies separately)
 * - EDIT mode (non-internal agency): First participant = applicant, always read-only
 *
 * Non-first participants are never affected by this condition - they return false here
 * but may still be read-only via PersonalDataMutabilityCondition in edit mode.
 */
class FirstParticipantReadOnlyCondition implements FieldConditionInterface
{
    /**
     * Evaluates if personal data fields should be shown as static text for the first participant.
     *
     * @param BookingDto           $bookingDto       The 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 fields should be shown as static text (read-only)
     */
    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
    {
        // This condition only applies to first participant (agency-based read-only)
        // Non-first participants: return false here, but may still be read-only via PersonalDataMutabilityCondition
        if (0 !== $participantIndex) {
            return false;
        }

        $participant = $bookingDto->getParticipant($participantIndex);

        // CREATE mode logic
        if (BookingDto::MODE_CREATE === $bookingDto->getMode()) {
            // Anonymous user (no personId) = must fill in data = editable
            if (null === $participant?->personId) {
                return false;
            }

            // Internal agency = first participant ≠ applicant = editable
            if ($bookingDto->isInternalAgencyBooking()) {
                return false;
            }

            // Logged-in user with non-internal agency = data prepopulated = read-only
            return true;
        }

        // EDIT mode logic
        // Internal agency = first participant ≠ applicant = editable (mutability check applies separately)
        if ($bookingDto->isInternalAgencyBooking()) {
            return false;
        }

        // Non-internal agency = first participant = applicant = always read-only
        return true;
    }

    /**
     * Returns field names that this condition depends on.
     *
     * This condition is based on agency code and personId which are set during initialization
     * and don't change during form interaction, so no field dependencies.
     *
     * @return string[] Empty array - no field dependencies
     */
    public function getDependentFields(): array
    {
        return [];
    }

    /**
     * Returns a human-readable description of this condition.
     *
     * @return string Description of the first participant read-only logic
     */
    public function getDescription(): string
    {
        return 'First participant personal data is read-only for non-internal agency bookings with logged-in users';
    }
}