<?php

/*
 * This file is part of the API Platform project.
 *
 * (c) Kévin Dunglas <dunglas@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace ApiPlatform\GraphQl\Type;

use ApiPlatform\GraphQl\Serializer\ItemNormalizer;
use ApiPlatform\Metadata\ApiProperty;
use ApiPlatform\Metadata\CollectionOperationInterface;
use ApiPlatform\Metadata\Exception\OperationNotFoundException;
use ApiPlatform\Metadata\GraphQl\Mutation;
use ApiPlatform\Metadata\GraphQl\Operation;
use ApiPlatform\Metadata\GraphQl\Query;
use ApiPlatform\Metadata\GraphQl\Subscription;
use ApiPlatform\Metadata\Resource\ResourceMetadataCollection;
use ApiPlatform\State\Pagination\Pagination;
use GraphQL\Type\Definition\EnumType;
use GraphQL\Type\Definition\InputObjectType;
use GraphQL\Type\Definition\InterfaceType;
use GraphQL\Type\Definition\NonNull;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type as GraphQLType;
use Psr\Container\ContainerInterface;
use Symfony\Component\PropertyInfo\Type;

/**
 * Builds the GraphQL types.
 *
 * @author Alan Poulain <contact@alanpoulain.eu>
 */
final class TypeBuilder implements ContextAwareTypeBuilderInterface
{
    private $defaultFieldResolver;

    public function __construct(private readonly TypesContainerInterface $typesContainer, callable $defaultFieldResolver, private readonly ContainerInterface $fieldsBuilderLocator, private readonly Pagination $pagination)
    {
        $this->defaultFieldResolver = $defaultFieldResolver;
    }

    /**
     * {@inheritdoc}
     */
    public function getResourceObjectType(ResourceMetadataCollection $resourceMetadataCollection, Operation $operation, ?ApiProperty $propertyMetadata = null, array $context = []): GraphQLType
    {
        $shortName = $operation->getShortName();
        $operationName = $operation->getName();
        $input = $context['input'];
        $depth = $context['depth'] ?? 0;
        $wrapped = $context['wrapped'] ?? false;

        if ($operation instanceof Mutation) {
            $shortName = $operationName.ucfirst($shortName);
        }

        if ($operation instanceof Subscription) {
            $shortName = $operationName.ucfirst($shortName).'Subscription';
        }

        if ($input) {
            if ($depth > 0) {
                $shortName .= 'Nested';
            }
            $shortName .= 'Input';
        } elseif ($operation instanceof Mutation || $operation instanceof Subscription) {
            if ($depth > 0) {
                $shortName .= 'Nested';
            }
            $shortName .= 'Payload';
        }

        if ('item_query' === $operationName || 'collection_query' === $operationName) {
            // Test if the collection/item has different groups
            if ($resourceMetadataCollection->getOperation($operation instanceof CollectionOperationInterface ? 'item_query' : 'collection_query')->getNormalizationContext() !== $operation->getNormalizationContext()) {
                $shortName .= $operation instanceof CollectionOperationInterface ? 'Collection' : 'Item';
            }
        }

        if ($wrapped && ($operation instanceof Mutation || $operation instanceof Subscription)) {
            $shortName .= 'Data';
        }

        $resourceObjectType = null;
        if (!$this->typesContainer->has($shortName)) {
            $resourceObjectType = $this->getResourceObjectTypeConfiguration($shortName, $resourceMetadataCollection, $operation, $context);
            $this->typesContainer->set($shortName, $resourceObjectType);
        }

        $resourceObjectType = $resourceObjectType ?? $this->typesContainer->get($shortName);
        if (!($resourceObjectType instanceof ObjectType || $resourceObjectType instanceof NonNull || $resourceObjectType instanceof InputObjectType)) {
            throw new \LogicException(\sprintf('Expected GraphQL type "%s" to be %s.', $shortName, implode('|', [ObjectType::class, NonNull::class, InputObjectType::class])));
        }

        $required = $propertyMetadata?->isRequired() ?? true;
        if ($required && $input) {
            $resourceObjectType = GraphQLType::nonNull($resourceObjectType);
        }

        return $resourceObjectType;
    }

    /**
     * {@inheritdoc}
     */
    public function getNodeInterface(): InterfaceType
    {
        if ($this->typesContainer->has('Node')) {
            $nodeInterface = $this->typesContainer->get('Node');
            if (!$nodeInterface instanceof InterfaceType) {
                throw new \LogicException(\sprintf('Expected GraphQL type "Node" to be %s.', InterfaceType::class));
            }

            return $nodeInterface;
        }

        $nodeInterface = new InterfaceType([
            'name' => 'Node',
            'description' => 'A node, according to the Relay specification.',
            'fields' => [
                'id' => [
                    'type' => GraphQLType::nonNull(GraphQLType::id()),
                    'description' => 'The id of this node.',
                ],
            ],
            'resolveType' => function ($value): ?GraphQLType {
                if (!isset($value[ItemNormalizer::ITEM_RESOURCE_CLASS_KEY])) {
                    return null;
                }

                $shortName = (new \ReflectionClass($value[ItemNormalizer::ITEM_RESOURCE_CLASS_KEY]))->getShortName();

                return $this->typesContainer->has($shortName) ? $this->typesContainer->get($shortName) : null;
            },
        ]);

        $this->typesContainer->set('Node', $nodeInterface);

        return $nodeInterface;
    }

    /**
     * {@inheritdoc}
     */
    public function getResourcePaginatedCollectionType(GraphQLType $resourceType, string $resourceClass, Operation $operation): GraphQLType
    {
        @trigger_error('Using getResourcePaginatedCollectionType method of TypeBuilder is deprecated since API Platform 3.1. Use getPaginatedCollectionType method instead.', \E_USER_DEPRECATED);

        return $this->getPaginatedCollectionType($resourceType, $operation);
    }

    /**
     * {@inheritdoc}
     */
    public function getPaginatedCollectionType(GraphQLType $resourceType, Operation $operation): GraphQLType
    {
        $namedType = GraphQLType::getNamedType($resourceType);
        // graphql-php 15: name() exists
        $shortName = method_exists($namedType, 'name') ? $namedType->name() : $namedType->name;
        $paginationType = $this->pagination->getGraphQlPaginationType($operation);

        $connectionTypeKey = \sprintf('%s%sConnection', $shortName, ucfirst($paginationType));
        if ($this->typesContainer->has($connectionTypeKey)) {
            return $this->typesContainer->get($connectionTypeKey);
        }

        $fields = 'cursor' === $paginationType ?
            $this->getCursorBasedPaginationFields($resourceType) :
            $this->getPageBasedPaginationFields($resourceType);

        $configuration = [
            'name' => $connectionTypeKey,
            'description' => \sprintf("%s connection for $shortName.", ucfirst($paginationType)),
            'fields' => $fields,
        ];

        $resourcePaginatedCollectionType = new ObjectType($configuration);
        $this->typesContainer->set($connectionTypeKey, $resourcePaginatedCollectionType);

        return $resourcePaginatedCollectionType;
    }

    public function getEnumType(Operation $operation): GraphQLType
    {
        $enumName = $operation->getShortName();

        if ($this->typesContainer->has($enumName)) {
            return $this->typesContainer->get($enumName);
        }

        /** @var FieldsBuilderEnumInterface|FieldsBuilderInterface $fieldsBuilder */
        $fieldsBuilder = $this->fieldsBuilderLocator->get('api_platform.graphql.fields_builder');
        $enumCases = [];
        // Remove the condition in API Platform 4.
        if ($fieldsBuilder instanceof FieldsBuilderEnumInterface) {
            $enumCases = $fieldsBuilder->getEnumFields($operation->getClass());
        } else {
            @trigger_error(\sprintf('api_platform.graphql.fields_builder service implementing "%s" is deprecated since API Platform 3.1. It has to implement "%s" instead.', FieldsBuilderInterface::class, FieldsBuilderEnumInterface::class), \E_USER_DEPRECATED);
        }

        $enumConfig = [
            'name' => $enumName,
            'values' => $enumCases,
        ];
        if ($enumDescription = $operation->getDescription()) {
            $enumConfig['description'] = $enumDescription;
        }

        $enumType = new EnumType($enumConfig);
        $this->typesContainer->set($enumName, $enumType);

        return $enumType;
    }

    /**
     * {@inheritdoc}
     */
    public function isCollection(Type $type): bool
    {
        return $type->isCollection() && ($collectionValueType = $type->getCollectionValueTypes()[0] ?? null) && null !== $collectionValueType->getClassName();
    }

    private function getCursorBasedPaginationFields(GraphQLType $resourceType): array
    {
        $namedType = GraphQLType::getNamedType($resourceType);
        // graphql-php 15: name() exists
        $shortName = method_exists($namedType, 'name') ? $namedType->name() : $namedType->name;

        $edgeObjectTypeConfiguration = [
            'name' => "{$shortName}Edge",
            'description' => "Edge of $shortName.",
            'fields' => [
                'node' => $resourceType,
                'cursor' => GraphQLType::nonNull(GraphQLType::string()),
            ],
        ];
        $edgeObjectType = new ObjectType($edgeObjectTypeConfiguration);
        $this->typesContainer->set("{$shortName}Edge", $edgeObjectType);

        $pageInfoObjectTypeConfiguration = [
            'name' => "{$shortName}PageInfo",
            'description' => 'Information about the current page.',
            'fields' => [
                'endCursor' => GraphQLType::string(),
                'startCursor' => GraphQLType::string(),
                'hasNextPage' => GraphQLType::nonNull(GraphQLType::boolean()),
                'hasPreviousPage' => GraphQLType::nonNull(GraphQLType::boolean()),
            ],
        ];
        $pageInfoObjectType = new ObjectType($pageInfoObjectTypeConfiguration);
        $this->typesContainer->set("{$shortName}PageInfo", $pageInfoObjectType);

        return [
            'edges' => GraphQLType::listOf($edgeObjectType),
            'pageInfo' => GraphQLType::nonNull($pageInfoObjectType),
            'totalCount' => GraphQLType::nonNull(GraphQLType::int()),
        ];
    }

    private function getPageBasedPaginationFields(GraphQLType $resourceType): array
    {
        $namedType = GraphQLType::getNamedType($resourceType);
        // graphql-php 15: name() exists
        $shortName = method_exists($namedType, 'name') ? $namedType->name() : $namedType->name;

        $paginationInfoObjectTypeConfiguration = [
            'name' => "{$shortName}PaginationInfo",
            'description' => 'Information about the pagination.',
            'fields' => [
                'itemsPerPage' => GraphQLType::nonNull(GraphQLType::int()),
                'lastPage' => GraphQLType::nonNull(GraphQLType::int()),
                'totalCount' => GraphQLType::nonNull(GraphQLType::int()),
                'hasNextPage' => GraphQLType::nonNull(GraphQLType::boolean()),
            ],
        ];
        $paginationInfoObjectType = new ObjectType($paginationInfoObjectTypeConfiguration);
        $this->typesContainer->set("{$shortName}PaginationInfo", $paginationInfoObjectType);

        return [
            'collection' => GraphQLType::listOf($resourceType),
            'paginationInfo' => GraphQLType::nonNull($paginationInfoObjectType),
        ];
    }

    private function getQueryOperation(ResourceMetadataCollection $resourceMetadataCollection): ?Operation
    {
        foreach ($resourceMetadataCollection as $resourceMetadata) {
            foreach ($resourceMetadata->getGraphQlOperations() as $operation) {
                // Filter the custom queries.
                if ($operation instanceof Query && !$operation->getResolver()) {
                    return $operation;
                }
            }
        }

        return null;
    }

    private function getResourceObjectTypeConfiguration(string $shortName, ResourceMetadataCollection $resourceMetadataCollection, Operation $operation, array $context = []): InputObjectType|ObjectType
    {
        $operationName = $operation->getName();
        $resourceClass = $operation->getClass();
        $input = $context['input'];
        $depth = $context['depth'] ?? 0;
        $wrapped = $context['wrapped'] ?? false;

        $ioMetadata = $input ? $operation->getInput() : $operation->getOutput();
        if (null !== $ioMetadata && \array_key_exists('class', $ioMetadata) && null !== $ioMetadata['class']) {
            $resourceClass = $ioMetadata['class'];
        }

        $wrapData = !$wrapped && ($operation instanceof Mutation || $operation instanceof Subscription) && !$input && $depth < 1;

        $configuration = [
            'name' => $shortName,
            'description' => $operation->getDescription(),
            'resolveField' => $this->defaultFieldResolver,
            'fields' => function () use ($resourceClass, $operation, $operationName, $resourceMetadataCollection, $input, $wrapData, $depth, $ioMetadata) {
                if ($wrapData) {
                    $queryNormalizationContext = $this->getQueryOperation($resourceMetadataCollection)?->getNormalizationContext() ?? [];

                    try {
                        $mutationNormalizationContext = $operation instanceof Mutation || $operation instanceof Subscription ? ($resourceMetadataCollection->getOperation($operationName)->getNormalizationContext() ?? []) : [];
                    } catch (OperationNotFoundException) {
                        $mutationNormalizationContext = [];
                    }
                    // Use a new type for the wrapped object only if there is a specific normalization context for the mutation or the subscription.
                    // If not, use the query type in order to ensure the client cache could be used.
                    $useWrappedType = $queryNormalizationContext !== $mutationNormalizationContext;

                    $wrappedOperationName = $operationName;

                    if (!$useWrappedType) {
                        $wrappedOperationName = $operation instanceof Query ? $operationName : 'item_query';
                    }

                    $wrappedOperation = $resourceMetadataCollection->getOperation($wrappedOperationName);

                    $fields = [
                        lcfirst($wrappedOperation->getShortName()) => $this->getResourceObjectType($resourceMetadataCollection, $wrappedOperation instanceof Operation ? $wrappedOperation : null, null, [
                            'input' => $input,
                            'wrapped' => true,
                            'depth' => $depth,
                        ]),
                    ];

                    if ($operation instanceof Subscription) {
                        $fields['clientSubscriptionId'] = GraphQLType::string();
                        if ($operation->getMercure()) {
                            $fields['mercureUrl'] = GraphQLType::string();
                        }

                        return $fields;
                    }

                    return $fields + ['clientMutationId' => GraphQLType::string()];
                }

                $fieldsBuilder = $this->fieldsBuilderLocator->get('api_platform.graphql.fields_builder');
                $fields = $fieldsBuilder->getResourceObjectTypeFields($resourceClass, $operation, $input, $depth, $ioMetadata);

                if ($input && $operation instanceof Mutation && null !== $mutationArgs = $operation->getArgs()) {
                    return $fieldsBuilder->resolveResourceArgs($mutationArgs, $operation) + ['clientMutationId' => $fields['clientMutationId']];
                }
                if ($input && $operation instanceof Mutation && null !== $extraMutationArgs = $operation->getExtraArgs()) {
                    return $fields + $fieldsBuilder->resolveResourceArgs($extraMutationArgs, $operation);
                }

                return $fields;
            },
            'interfaces' => $wrapData ? [] : [$this->getNodeInterface()],
        ];

        return $input ? new InputObjectType($configuration) : new ObjectType($configuration);
    }
}
