<?php

declare(strict_types=1);

namespace App\Form\Service;

use App\Form\Model\BookingDtoInterface;
use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
use App\Form\ParticipantFieldHandler\Condition\MutabilityCondition;
use App\Form\ParticipantFieldHandler\Condition\ApplicantCondition;
use App\Form\ParticipantFieldHandler\Condition\CompositeCondition;

/**
 * Field state provider for the booking edit workflow.
 *
 * This service calculates dynamic field states (readonly, disabled, etc.)
 * for participant fields in the edit flow, using edit-specific conditions.
 *
 * It is designed to be extensible and composable, allowing reuse of
 * existing condition classes and easy registration of new logic.
 */
class EditFieldStateProvider implements FieldStateProviderInterface
{
    /** @var array<string, array<string, FieldConditionInterface>> */
    private array $fieldStateConditions = [];

    public function __construct()
    {
        $this->registerFieldStateConditions();
    }

    /**
     * Registers field state conditions for the edit workflow.
     *
     * Add or modify conditions as needed for your domain.
     */
    private function registerFieldStateConditions(): void
    {
        // Make all personal data fields readonly if not mutable OR if applicant
        $personalDataFields = [
            'firstName',
            'lastName',
            'dateOfBirth',
            'gender',
            'nationality',
            'email',
            'mobile',
        ];
        foreach ($personalDataFields as $field) {
            $this->fieldStateConditions[$field] = [
                'readonly' => CompositeCondition::or(
                    new ApplicantCondition(),
                    new MutabilityCondition()
                ),
            ];
        }

        // Example: Only applicant can edit email
        $this->fieldStateConditions['email']['readonly'] = new ApplicantCondition();
    }

    public function getFieldState(string $fieldName, BookingDtoInterface $bookingDto, int $participantIndex, array $formData = []): array
    {
        if (!isset($this->fieldStateConditions[$fieldName])) {
            return [];
        }

        $stateModifications = [];
        $attributes = [];

        foreach ($this->fieldStateConditions[$fieldName] as $stateType => $condition) {
            if ($condition->evaluate($bookingDto, $participantIndex, $formData)) {
                switch ($stateType) {
                    case 'readonly':
                        $attributes['readonly'] = true;
                        break;
                    case 'disabled':
                        $stateModifications['disabled'] = true;
                        break;
                    case 'required':
                        $stateModifications['required'] = true;
                        break;
                    case 'hidden':
                        $attributes['style'] = ($attributes['style'] ?? '').' display: none;';
                        break;
                }
            }
        }

        if (!empty($attributes)) {
            $stateModifications['attr'] = $attributes;
        }

        return $stateModifications;
    }

    public function hasStateConditions(string $fieldName): bool
    {
        return isset($this->fieldStateConditions[$fieldName]) && !empty($this->fieldStateConditions[$fieldName]);
    }

    public function getFieldStateDependencies(string $fieldName): array
    {
        if (!isset($this->fieldStateConditions[$fieldName])) {
            return [];
        }

        $dependencies = [];
        foreach ($this->fieldStateConditions[$fieldName] as $condition) {
            $dependencies = array_merge($dependencies, $condition->getDependentFields());
        }
        return array_unique($dependencies);
    }

    public function getAllFieldStates(BookingDtoInterface $bookingDto, int $participantIndex, array $formData = []): array
    {
        $allStates = [];
        foreach (array_keys($this->fieldStateConditions) as $fieldName) {
            $fieldState = $this->getFieldState($fieldName, $bookingDto, $participantIndex, $formData);
            if (!empty($fieldState)) {
                $allStates[$fieldName] = $fieldState;
            }
        }
        return $allStates;
    }
}