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<?php

declare(strict_types=1);

namespace NunoMaduro\Larastan\Support;

use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Illuminate\Support\Collection;
use Illuminate\Support\Enumerable;
use Iterator;
use IteratorAggregate;
use PHPStan\Type\GeneralizePrecision;
use PHPStan\Type\Generic\GenericObjectType;
use PHPStan\Type\IntegerType;
use PHPStan\Type\MixedType;
use PHPStan\Type\ObjectType;
use PHPStan\Type\StringType;
use PHPStan\Type\Type;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\TypeUtils;
use PHPStan\Type\TypeWithClassName;
use Traversable;

final class CollectionHelper
{
    public function determineGenericCollectionTypeFromType(Type $type): GenericObjectType
    {
        $keyType = TypeCombinator::union(new IntegerType(), new StringType());

if ($type instanceof TypeWithClassName) {
            if ((new ObjectType(Enumerable::class))->isSuperTypeOf($type)->yes()) {
                return $this->getTypeFromEloquentCollection($type);
            }

if (
                (new ObjectType(Traversable::class))->isSuperTypeOf($type)->yes() ||
                (new ObjectType(IteratorAggregate::class))->isSuperTypeOf($type)->yes() ||
                (new ObjectType(Iterator::class))->isSuperTypeOf($type)->yes()
            ) {
                return $this->getTypeFromIterator($type);
            }
        }

if (! $type->isArray()->yes()) {
            return new GenericObjectType(Collection::class, [$type->toArray()->getIterableKeyType(), $type->toArray()->getIterableValueType()]);
        }

if ($type->isIterableAtLeastOnce()->no()) {
            return new GenericObjectType(Collection::class, [$keyType, new MixedType()]);
        }

return new GenericObjectType(Collection::class, [
            TypeUtils::generalizeType($type->getIterableKeyType(), GeneralizePrecision::lessSpecific()),
            TypeUtils::generalizeType($type->getIterableValueType(), GeneralizePrecision::lessSpecific()),
        ]);
    }

private function getTypeFromEloquentCollection(TypeWithClassName $valueType): GenericObjectType
    {
        $keyType = TypeCombinator::union(new IntegerType(), new StringType());

$classReflection = $valueType->getClassReflection();

if ($classReflection === null) {
            return new GenericObjectType(Collection::class, [$keyType, new MixedType()]);
        }

$innerValueType = $classReflection->getActiveTemplateTypeMap()->getType('TModel');

if ($classReflection->getName() === EloquentCollection::class || $classReflection->isSubclassOf(EloquentCollection::class)) {
            $keyType = new IntegerType();
        }

if ($innerValueType !== null) {
            return new GenericObjectType(Collection::class, [$keyType, $innerValueType]);
        }

return new GenericObjectType(Collection::class, [$keyType, new MixedType()]);
    }

private function getTypeFromIterator(TypeWithClassName $valueType): GenericObjectType
    {
        $keyType = TypeCombinator::union(new IntegerType(), new StringType());

$classReflection = $valueType->getClassReflection();

if ($classReflection === null) {
            return new GenericObjectType(Collection::class, [$keyType, new MixedType()]);
        }

$templateTypes = array_values($classReflection->getActiveTemplateTypeMap()->getTypes());

if (count($templateTypes) === 1) {
            return new GenericObjectType(Collection::class, [$keyType, $templateTypes[0]]);
        }

return new GenericObjectType(Collection::class, $templateTypes);
    }
}