<?php

/*
 * This file is part of the Symfony MakerBundle 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\Bundle\MakerBundle\Doctrine;

use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Types\Type;
use Doctrine\DBAL\Types\Types;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Mapping\Driver\AttributeDriver;
use Doctrine\ORM\Mapping\MappingException as ORMMappingException;
use Doctrine\ORM\Mapping\NamingStrategy;
use Doctrine\Persistence\ManagerRegistry;
use Doctrine\Persistence\Mapping\AbstractClassMetadataFactory;
use Doctrine\Persistence\Mapping\ClassMetadata;
use Doctrine\Persistence\Mapping\Driver\MappingDriver;
use Doctrine\Persistence\Mapping\Driver\MappingDriverChain;
use Doctrine\Persistence\Mapping\MappingException as PersistenceMappingException;
use Symfony\Bundle\MakerBundle\Util\ClassNameDetails;
use Symfony\Component\Uid\Ulid;
use Symfony\Component\Uid\Uuid;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Ryan Weaver <ryan@knpuniversity.com>
 * @author Sadicov Vladimir <sadikoff@gmail.com>
 *
 * @internal
 */
final class DoctrineHelper
{
    public function __construct(
        private string $entityNamespace,
        private ?ManagerRegistry $registry = null,
        private ?array $mappingDriversByPrefix = null,
    ) {
        $this->entityNamespace = trim($entityNamespace, '\\');
    }

    public function getRegistry(): ManagerRegistry
    {
        // this should never happen: we will have checked for the
        // DoctrineBundle dependency before calling this
        if (null === $this->registry) {
            throw new \Exception('Somehow the doctrine service is missing. Is DoctrineBundle installed?');
        }

        return $this->registry;
    }

    private function isDoctrineInstalled(): bool
    {
        return null !== $this->registry;
    }

    public function getEntityNamespace(): string
    {
        return $this->entityNamespace;
    }

    public function doesClassUseDriver(string $className, string $driverClass): bool
    {
        try {
            /** @var EntityManagerInterface $em */
            $em = $this->getRegistry()->getManagerForClass($className);
        } catch (\ReflectionException) {
            // this exception will be thrown by the registry if the class isn't created yet.
            // an example case is the "make:entity" command, which needs to know which driver is used for the class to determine
            // if the class should be generated with attributes or annotations. If this exception is thrown, we will check based on the
            // namespaces for the given $className and compare it with the doctrine configuration to get the correct MappingDriver.

            // extract the new class's namespace from the full $className to check the namespace of the new class against the doctrine configuration.
            $classNameComponents = explode('\\', $className);
            if (1 < \count($classNameComponents)) {
                array_pop($classNameComponents);
            }
            $classNamespace = implode('\\', $classNameComponents);

            return $this->isInstanceOf($this->getMappingDriverForNamespace($classNamespace), $driverClass);
        }

        if (null === $em) {
            throw new \InvalidArgumentException(\sprintf('Cannot find the entity manager for class "%s". Ensure entity uses attribute mapping.', $className));
        }

        if (null === $this->mappingDriversByPrefix) {
            // doctrine-bundle <= 2.2
            $metadataDriver = $em->getConfiguration()->getMetadataDriverImpl();

            if (!$this->isInstanceOf($metadataDriver, MappingDriverChain::class)) {
                return $this->isInstanceOf($metadataDriver, $driverClass);
            }

            foreach ($metadataDriver->getDrivers() as $namespace => $driver) {
                if (str_starts_with($className, $namespace)) {
                    return $this->isInstanceOf($driver, $driverClass);
                }
            }

            return $this->isInstanceOf($metadataDriver->getDefaultDriver(), $driverClass);
        }

        $managerName = array_search($em, $this->getRegistry()->getManagers(), true);

        foreach ($this->mappingDriversByPrefix[$managerName] as [$prefix, $prefixDriver]) {
            if (str_starts_with($className, $prefix)) {
                return $this->isInstanceOf($prefixDriver, $driverClass);
            }
        }

        return false;
    }

    public function doesClassUsesAttributes(string $className): bool
    {
        return $this->doesClassUseDriver($className, AttributeDriver::class);
    }

    public function isDoctrineSupportingAttributes(): bool
    {
        return $this->isDoctrineInstalled();
    }

    public function getEntitiesForAutocomplete(): array
    {
        $entities = [];

        if ($this->isDoctrineInstalled()) {
            $allMetadata = $this->getMetadata();

            foreach (array_keys($allMetadata) as $classname) {
                $entityClassDetails = new ClassNameDetails($classname, $this->entityNamespace);
                $entities[] = $entityClassDetails->getRelativeName();
            }
        }

        sort($entities);

        return $entities;
    }

    public function getMetadata(?string $classOrNamespace = null, bool $disconnected = false): array|ClassMetadata
    {
        // Invalidating the cached AttributeDriver::$classNames to find new Entity classes
        foreach ($this->mappingDriversByPrefix ?? [] as $managerName => $prefixes) {
            foreach ($prefixes as [$prefix, $attributeDriver]) {
                if ($attributeDriver instanceof AttributeDriver) {
                    $classNames = (new \ReflectionClass(AttributeDriver::class))->getProperty('classNames');

                    $classNames->setAccessible(true);
                    $classNames->setValue($attributeDriver, null);
                }
            }
        }

        $metadata = [];

        /** @var EntityManagerInterface $em */
        foreach ($this->getRegistry()->getManagers() as $em) {
            $cmf = $em->getMetadataFactory();

            if ($disconnected) {
                try {
                    $loaded = $cmf->getAllMetadata();
                } catch (ORMMappingException|PersistenceMappingException) {
                    $loaded = $this->isInstanceOf($cmf, AbstractClassMetadataFactory::class) ? $cmf->getLoadedMetadata() : [];
                }

                // Set the reflection service that was used in the now removed DisconnectedClassMetadataFactory::class
                $cmf->setReflectionService(new StaticReflectionService());

                foreach ($loaded as $m) {
                    $cmf->setMetadataFor($m->getName(), $m);
                }

                if (null === $this->mappingDriversByPrefix) {
                    // Invalidating the cached AttributeDriver::$classNames to find new Entity classes
                    $metadataDriver = $em->getConfiguration()->getMetadataDriverImpl();

                    if ($this->isInstanceOf($metadataDriver, MappingDriverChain::class)) {
                        foreach ($metadataDriver->getDrivers() as $driver) {
                            if ($this->isInstanceOf($driver, AttributeDriver::class)) {
                                $classNames->setValue($driver, null);
                            }
                        }
                    }
                }
            }

            foreach ($cmf->getAllMetadata() as $m) {
                if (null === $classOrNamespace) {
                    $metadata[$m->getName()] = $m;
                } else {
                    if ($m->getName() === $classOrNamespace) {
                        return $m;
                    }

                    if (str_starts_with($m->getName(), $classOrNamespace)) {
                        $metadata[$m->getName()] = $m;
                    }
                }
            }
        }

        return $metadata;
    }

    public function createDoctrineDetails(string $entityClassName): ?EntityDetails
    {
        $metadata = $this->getMetadata($entityClassName);

        if ($this->isInstanceOf($metadata, ClassMetadata::class)) {
            return new EntityDetails($metadata);
        }

        return null;
    }

    public function isClassAMappedEntity(string $className): bool
    {
        if (!$this->isDoctrineInstalled()) {
            return false;
        }

        return (bool) $this->getMetadata($className);
    }

    /**
     * Determines if the property-type will make the column type redundant.
     *
     * See ClassMetadataInfo::validateAndCompleteTypedFieldMapping()
     */
    public static function canColumnTypeBeInferredByPropertyType(string $columnType, string $propertyType): bool
    {
        // todo: guessing on enum's could be added

        return match ($propertyType) {
            '\\'.\DateInterval::class => Types::DATEINTERVAL === $columnType,
            '\\'.\DateTime::class => Types::DATETIME_MUTABLE === $columnType,
            '\\'.\DateTimeImmutable::class => Types::DATETIME_IMMUTABLE === $columnType,
            'array' => Types::JSON === $columnType,
            'bool' => Types::BOOLEAN === $columnType,
            'float' => Types::FLOAT === $columnType,
            'int' => Types::INTEGER === $columnType,
            'string' => Types::STRING === $columnType,
            default => false,
        };
    }

    public static function getPropertyTypeForColumn(string $columnType): ?string
    {
        $propertyType = match ($columnType) {
            Types::STRING, Types::TEXT, Types::GUID, Types::BIGINT, Types::DECIMAL => 'string',
            'array', Types::SIMPLE_ARRAY, Types::JSON => 'array',
            Types::BOOLEAN => 'bool',
            Types::INTEGER, Types::SMALLINT => 'int',
            Types::FLOAT => 'float',
            Types::DATETIME_MUTABLE, Types::DATETIMETZ_MUTABLE, Types::DATE_MUTABLE, Types::TIME_MUTABLE => '\\'.\DateTime::class,
            Types::DATETIME_IMMUTABLE, Types::DATETIMETZ_IMMUTABLE, Types::DATE_IMMUTABLE, Types::TIME_IMMUTABLE => '\\'.\DateTimeImmutable::class,
            Types::DATEINTERVAL => '\\'.\DateInterval::class,
            'object' => 'object',
            'uuid' => '\\'.Uuid::class,
            'ulid' => '\\'.Ulid::class,
            default => null,
        };

        if (null !== $propertyType || !($registry = Type::getTypeRegistry())->has($columnType)) {
            return $propertyType;
        }

        $reflection = new \ReflectionClass(($registry->get($columnType))::class);

        $returnType = $reflection->getMethod('convertToPHPValue')->getReturnType();

        /*
         * we do not support union and intersection types
         */
        if (!$returnType instanceof \ReflectionNamedType) {
            return null;
        }

        return $returnType->isBuiltin() ? $returnType->getName() : '\\'.$returnType->getName();
    }

    /**
     * Given the string "column type", this returns the "Types::STRING" constant.
     *
     * This is, effectively, a reverse lookup: given the final string, give us
     * the constant to be used in the generated code.
     */
    public static function getTypeConstant(string $columnType): ?string
    {
        $reflection = new \ReflectionClass(Types::class);
        $constants = array_flip($reflection->getConstants());

        if (!isset($constants[$columnType])) {
            return null;
        }

        return \sprintf('Types::%s', $constants[$columnType]);
    }

    private function isInstanceOf($object, string $class): bool
    {
        if (!\is_object($object)) {
            return false;
        }

        return $object instanceof $class;
    }

    public function getPotentialTableName(string $className): string
    {
        $entityManager = $this->getRegistry()->getManager();

        if (!$entityManager instanceof EntityManagerInterface) {
            throw new \RuntimeException('ObjectManager is not an EntityManagerInterface.');
        }

        /** @var NamingStrategy $namingStrategy */
        $namingStrategy = $entityManager->getConfiguration()->getNamingStrategy();

        return $namingStrategy->classToTableName($className);
    }

    public function isKeyword(string $name): bool
    {
        /** @var Connection $connection */
        $connection = $this->getRegistry()->getConnection();

        return $connection->getDatabasePlatform()->getReservedKeywordsList()->isKeyword($name);
    }

    /**
     * this method tries to find the correct MappingDriver for the given namespace/class
     * To determine which MappingDriver belongs to the class we check the prefixes configured in Doctrine and use the
     * prefix that has the closest match to the given $namespace.
     *
     * this helper function is needed to create entities with the configuration of doctrine if they are not yet been registered
     * in the ManagerRegistry
     */
    private function getMappingDriverForNamespace(string $namespace): ?MappingDriver
    {
        $lowestCharacterDiff = null;
        $foundDriver = null;

        foreach ($this->mappingDriversByPrefix ?? [] as $mappings) {
            foreach ($mappings as [$prefix, $driver]) {
                $diff = substr_compare($namespace, $prefix, 0);

                if ($diff >= 0 && (null === $lowestCharacterDiff || $diff < $lowestCharacterDiff)) {
                    $lowestCharacterDiff = $diff;
                    $foundDriver = $driver;
                }
            }
        }

        return $foundDriver;
    }
}