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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Serializer\Normalizer;

use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
use Symfony\Component\Validator\ConstraintViolationListInterface;

/**
 * A normalizer that normalizes a ConstraintViolationListInterface instance.
 *
 * This Normalizer implements RFC7807 {@link https://tools.ietf.org/html/rfc7807}.
 *
 * @author Grégoire Pineau <lyrixx@lyrixx.info>
 * @author Kévin Dunglas <dunglas@gmail.com>
 *
 * @final since Symfony 6.3
 */
class ConstraintViolationListNormalizer implements NormalizerInterface, CacheableSupportsMethodInterface
{
    public const INSTANCE = 'instance';
    public const STATUS = 'status';
    public const TITLE = 'title';
    public const TYPE = 'type';
    public const PAYLOAD_FIELDS = 'payload_fields';

    public function __construct(
        private readonly array $defaultContext = [],
        private readonly ?NameConverterInterface $nameConverter = null,
    ) {
    }

    public function getSupportedTypes(?string $format): array
    {
        return [
            ConstraintViolationListInterface::class => __CLASS__ === static::class || $this->hasCacheableSupportsMethod(),
        ];
    }

    public function normalize(mixed $object, ?string $format = null, array $context = []): array
    {
        if (\array_key_exists(self::PAYLOAD_FIELDS, $context)) {
            $payloadFieldsToSerialize = $context[self::PAYLOAD_FIELDS];
        } elseif (\array_key_exists(self::PAYLOAD_FIELDS, $this->defaultContext)) {
            $payloadFieldsToSerialize = $this->defaultContext[self::PAYLOAD_FIELDS];
        } else {
            $payloadFieldsToSerialize = [];
        }

        if (\is_array($payloadFieldsToSerialize) && [] !== $payloadFieldsToSerialize) {
            $payloadFieldsToSerialize = array_flip($payloadFieldsToSerialize);
        }

        $violations = [];
        $messages = [];
        foreach ($object as $violation) {
            $propertyPath = $violation->getPropertyPath();

            if (null !== $this->nameConverter) {
                $propertyPath = $this->normalizePropertyPath($propertyPath, \is_object($violation->getRoot()) ? \get_class($violation->getRoot()) : null, $format, $context);
            }

            $violationEntry = [
                'propertyPath' => $propertyPath,
                'title' => $violation->getMessage(),
                'template' => $violation->getMessageTemplate(),
                'parameters' => $violation->getParameters(),
            ];
            if (null !== $code = $violation->getCode()) {
                $violationEntry['type'] = \sprintf('urn:uuid:%s', $code);
            }

            $constraint = $violation->getConstraint();
            if (
                [] !== $payloadFieldsToSerialize
                && $constraint
                && $constraint->payload
                // If some or all payload fields are whitelisted, add them
                && $payloadFields = null === $payloadFieldsToSerialize || true === $payloadFieldsToSerialize ? $constraint->payload : array_intersect_key($constraint->payload, $payloadFieldsToSerialize)
            ) {
                $violationEntry['payload'] = $payloadFields;
            }

            $violations[] = $violationEntry;

            $prefix = $propertyPath ? \sprintf('%s: ', $propertyPath) : '';
            $messages[] = $prefix.$violation->getMessage();
        }

        $result = [
            'type' => $context[self::TYPE] ?? $this->defaultContext[self::TYPE] ?? 'https://symfony.com/errors/validation',
            'title' => $context[self::TITLE] ?? $this->defaultContext[self::TITLE] ?? 'Validation Failed',
        ];
        if (null !== $status = ($context[self::STATUS] ?? $this->defaultContext[self::STATUS] ?? null)) {
            $result['status'] = $status;
        }
        if ($messages) {
            $result['detail'] = implode("\n", $messages);
        }
        if (null !== $instance = ($context[self::INSTANCE] ?? $this->defaultContext[self::INSTANCE] ?? null)) {
            $result['instance'] = $instance;
        }

        return $result + ['violations' => $violations];
    }

    private function normalizePropertyPath(string $propertyPath, ?string $class, ?string $format, array $context): string
    {
        if (!str_contains($propertyPath, '.')) {
            return $this->nameConverter->normalize($propertyPath, $class, $format, $context);
        }

        $result = [];
        $currentClass = $class;

        foreach (explode('.', $propertyPath) as $segment) {
            $subscript = '';
            $propertyName = $segment;
            if (false !== $bracketPos = strpos($segment, '[')) {
                $propertyName = substr($segment, 0, $bracketPos);
                $subscript = substr($segment, $bracketPos);
            }

            $result[] = $this->nameConverter->normalize($propertyName, $currentClass, $format, $context).$subscript;

            $currentClass = $this->getPropertyClassFromReflection($currentClass, $propertyName);
        }

        return implode('.', $result);
    }

    private function getPropertyClassFromReflection(?string $class, string $property): ?string
    {
        if (null === $class) {
            return null;
        }

        try {
            $type = (new \ReflectionProperty($class, $property))->getType();
            if ($type instanceof \ReflectionNamedType && !$type->isBuiltin()) {
                return $type->getName();
            }
        } catch (\ReflectionException) {
        }

        return null;
    }

    /**
     * @param array $context
     */
    public function supportsNormalization(mixed $data, ?string $format = null /* , array $context = [] */): bool
    {
        return $data instanceof ConstraintViolationListInterface;
    }

    /**
     * @deprecated since Symfony 6.3, use "getSupportedTypes()" instead
     */
    public function hasCacheableSupportsMethod(): bool
    {
        trigger_deprecation('symfony/serializer', '6.3', 'The "%s()" method is deprecated, implement "%s::getSupportedTypes()" instead.', __METHOD__, get_debug_type($this));

        return __CLASS__ === static::class;
    }
}