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File "ReflectionClassDefinitionRepository.php"

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<?php

declare(strict_types=1);

namespace CuyZ\Valinor\Definition\Repository\Reflection;

use CuyZ\Valinor\Definition\Attributes;
use CuyZ\Valinor\Definition\ClassDefinition;
use CuyZ\Valinor\Definition\MethodDefinition;
use CuyZ\Valinor\Definition\Methods;
use CuyZ\Valinor\Definition\Properties;
use CuyZ\Valinor\Definition\PropertyDefinition;
use CuyZ\Valinor\Definition\Repository\AttributesRepository;
use CuyZ\Valinor\Definition\Repository\ClassDefinitionRepository;
use CuyZ\Valinor\Definition\Repository\Reflection\TypeResolver\ClassImportedTypeAliasResolver;
use CuyZ\Valinor\Definition\Repository\Reflection\TypeResolver\ClassLocalTypeAliasResolver;
use CuyZ\Valinor\Definition\Repository\Reflection\TypeResolver\ClassParentTypeResolver;
use CuyZ\Valinor\Definition\Repository\Reflection\TypeResolver\ClassGenericResolver;
use CuyZ\Valinor\Definition\Repository\Reflection\TypeResolver\ReflectionTypeResolver;
use CuyZ\Valinor\Mapper\Object\Constructor;
use CuyZ\Valinor\Type\ObjectType;
use CuyZ\Valinor\Type\Parser\Factory\TypeParserFactory;
use CuyZ\Valinor\Type\Parser\UnresolvableTypeFinderParser;
use CuyZ\Valinor\Type\Parser\VacantTypeAssignerParser;
use CuyZ\Valinor\Type\Type;
use CuyZ\Valinor\Type\Types\InterfaceType;
use CuyZ\Valinor\Type\Types\NativeClassType;
use CuyZ\Valinor\Type\Types\UnresolvableType;
use CuyZ\Valinor\Utility\Reflection\Reflection;
use ReflectionMethod;
use ReflectionProperty;

use function array_filter;
use function array_keys;
use function array_map;

/** @internal */
final class ReflectionClassDefinitionRepository implements ClassDefinitionRepository
{
    private TypeParserFactory $typeParserFactory;

    private AttributesRepository $attributesRepository;

    private ReflectionPropertyDefinitionBuilder $propertyBuilder;

    private ReflectionMethodDefinitionBuilder $methodBuilder;

    private ClassParentTypeResolver $parentTypeResolver;

    private ClassGenericResolver $genericResolver;

    private ClassLocalTypeAliasResolver $localTypeAliasResolver;

    private ClassImportedTypeAliasResolver $importedTypeAliasResolver;

    /**
     * @param list<class-string> $allowedAttributes
     */
    public function __construct(
        TypeParserFactory $typeParserFactory,
        array $allowedAttributes,
    ) {
        $this->typeParserFactory = $typeParserFactory;
        $this->attributesRepository = new ReflectionAttributesRepository($this, $allowedAttributes);
        $this->propertyBuilder = new ReflectionPropertyDefinitionBuilder($this->attributesRepository);
        $this->methodBuilder = new ReflectionMethodDefinitionBuilder($this->attributesRepository);
        $this->parentTypeResolver = new ClassParentTypeResolver($this->typeParserFactory);
        $this->genericResolver = new ClassGenericResolver($this->typeParserFactory);
        $this->localTypeAliasResolver = new ClassLocalTypeAliasResolver($this->typeParserFactory);
        $this->importedTypeAliasResolver = new ClassImportedTypeAliasResolver($this->typeParserFactory);
    }

    public function for(ObjectType $type): ClassDefinition
    {
        $reflection = Reflection::class($type->className());

        $vacantTypes = $this->vacantTypes($type);

        $nativeTypeParser = $this->typeParserFactory->buildNativeTypeParserForClass($type->className());

        $advancedTypeParser = $this->typeParserFactory->buildAdvancedTypeParserForClass($type->className());
        $advancedTypeParser = new VacantTypeAssignerParser($advancedTypeParser, $vacantTypes);
        $advancedTypeParser = new UnresolvableTypeFinderParser($advancedTypeParser);

        $typeResolver = new ReflectionTypeResolver($nativeTypeParser, $advancedTypeParser);

        return new ClassDefinition(
            $reflection->name,
            $type,
            new Attributes(...$this->attributesRepository->for($reflection)),
            new Properties(...$this->properties($type, $typeResolver)),
            new Methods(...$this->methods($type, $typeResolver)),
            $reflection->isFinal(),
            $reflection->isAbstract(),
        );
    }

    /**
     * @return array<non-empty-string, Type>
     */
    private function vacantTypes(ObjectType $type): array
    {
        $generics = [];

        if ($type instanceof NativeClassType || $type instanceof InterfaceType) {
            $generics = $this->genericResolver->resolveGenerics($type);
        }

        $localTypes = $this->localTypeAliasResolver->resolveLocalTypeAliases($type);
        $importedTypes = $this->importedTypeAliasResolver->resolveImportedTypeAliases($type);

        $vacantTypes = [...$generics, ...$localTypes, ...$importedTypes];

        $keys = [...array_keys($generics), ...array_keys($localTypes), ...array_keys($importedTypes)];

        // PHP8.5 use pipes
        $aliasCollision = array_filter(
            array_count_values($keys),
            fn (int $count) => $count > 1
        );

        foreach ($aliasCollision as $alias => $numberOfCollisions) {
            /** @var non-empty-string $alias */
            $vacantTypes[$alias] = UnresolvableType::forClassTypeAliasesCollision($alias, $numberOfCollisions);
        }

        return $vacantTypes;
    }

    /**
     * @return list<PropertyDefinition>
     */
    private function properties(ObjectType $type, ReflectionTypeResolver $typeResolver): array
    {
        $reflection = Reflection::class($type->className());

        $properties = [];

        foreach ($reflection->getProperties() as $property) {
            $declaringClass = $property->getDeclaringClass();

            if ($declaringClass->name === $type->className()) {
                $properties[$property->name] = $this->propertyBuilder->for($property, $typeResolver);
            } else {
                $parentClass = $this->parentTypeResolver->resolveParentTypeFor($type);

                $properties[$property->name] = $this->for($parentClass)->properties->get($property->name);
            }
        }

        // Properties will be sorted by inheritance order, from parent to child.
        $sortedProperties = [];

        while ($reflection) {
            $currentProperties = array_map(
                fn (ReflectionProperty $property) => $properties[$property->name],
                array_filter(
                    $reflection->getProperties(),
                    fn (ReflectionProperty $property) => isset($properties[$property->name]),
                ),
            );

            $sortedProperties = [...$currentProperties, ...$sortedProperties];

            $reflection = $reflection->getParentClass();
        }

        return $sortedProperties;
    }

    /**
     * @return array<MethodDefinition>
     */
    private function methods(ObjectType $type, ReflectionTypeResolver $typeResolver): array
    {
        $reflection = Reflection::class($type->className());
        $methods = array_filter($reflection->getMethods(), $this->shouldMethodBeIncluded(...));

        // Because `ReflectionMethod::getMethods()` wont list the constructor if
        // it comes from a parent class AND is not public, we need to manually
        // fetch it and add it to the list.
        if ($reflection->hasMethod('__construct')) {
            $methods[] = $reflection->getMethod('__construct');
        }

        return array_map(function (ReflectionMethod $method) use ($type, $typeResolver) {
            $declaringClass = $method->getDeclaringClass();

            if ($declaringClass->name === $type->className()) {
                return $this->methodBuilder->for($method, $typeResolver);
            }

            $parentClass = $this->parentTypeResolver->resolveParentTypeFor($type);

            return $this->for($parentClass)->methods->get($method->name);
        }, $methods);
    }

    private function shouldMethodBeIncluded(ReflectionMethod $method): bool
    {
        return $method->name === 'map'
            || $method->name === 'normalize'
            || $method->name === 'normalizeKey'
            || $method->getAttributes(Constructor::class) !== [];
    }
}