<?php

declare (strict_types=1);
namespace Rector\DowngradePhp74\Rector\ClassMethod;

use PhpParser\Node;
use PhpParser\Node\FunctionLike;
use PhpParser\Node\NullableType;
use PhpParser\Node\Param;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Function_;
use PhpParser\Node\UnionType;
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\ClassReflection;
use Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger;
use Rector\Core\Rector\AbstractRector;
use Rector\Core\ValueObject\MethodName;
use Rector\NodeTypeResolver\Node\AttributeKey;
use ReflectionMethod;
use ReflectionNamedType;
use ReflectionParameter;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @changelog https://www.php.net/manual/en/language.oop5.variance.php#language.oop5.variance.contravariance
 *
 * @see \Rector\Tests\DowngradePhp74\Rector\ClassMethod\DowngradeContravariantArgumentTypeRector\DowngradeContravariantArgumentTypeRectorTest
 */
final class DowngradeContravariantArgumentTypeRector extends \Rector\Core\Rector\AbstractRector
{
    /**
     * @var \Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger
     */
    private $phpDocTypeChanger;
    public function __construct(\Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger $phpDocTypeChanger)
    {
        $this->phpDocTypeChanger = $phpDocTypeChanger;
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [\PhpParser\Node\Stmt\ClassMethod::class, \PhpParser\Node\Stmt\Function_::class];
    }
    public function getRuleDefinition() : \Symplify\RuleDocGenerator\ValueObject\RuleDefinition
    {
        return new \Symplify\RuleDocGenerator\ValueObject\RuleDefinition('Remove contravariant argument type declarations', [new \Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample(<<<'CODE_SAMPLE'
class ParentType {}
class ChildType extends ParentType {}

class A
{
    public function contraVariantArguments(ChildType $type)
    {
    }
}

class B extends A
{
    public function contraVariantArguments(ParentType $type)
    {
    }
}
CODE_SAMPLE
, <<<'CODE_SAMPLE'
class ParentType {}
class ChildType extends ParentType {}

class A
{
    public function contraVariantArguments(ChildType $type)
    {
    }
}

class B extends A
{
    /**
     * @param ParentType $type
     */
    public function contraVariantArguments($type)
    {
    }
}
CODE_SAMPLE
)]);
    }
    /**
     * @param ClassMethod|Function_ $node
     */
    public function refactor(\PhpParser\Node $node) : ?\PhpParser\Node
    {
        if ($node->params === []) {
            return null;
        }
        foreach ($node->params as $param) {
            $this->refactorParam($param, $node);
        }
        return null;
    }
    private function isNullableParam(\PhpParser\Node\Param $param, \PhpParser\Node\FunctionLike $functionLike) : bool
    {
        if ($param->variadic) {
            return \false;
        }
        if ($param->type === null) {
            return \false;
        }
        // Don't consider for Union types
        if ($param->type instanceof \PhpParser\Node\UnionType) {
            return \false;
        }
        // Contravariant arguments are supported for __construct
        if ($this->isName($functionLike, \Rector\Core\ValueObject\MethodName::CONSTRUCT)) {
            return \false;
        }
        // Check if the type is different from the one declared in some ancestor
        return $this->getDifferentParamTypeFromAncestorClass($param, $functionLike) !== null;
    }
    private function getDifferentParamTypeFromAncestorClass(\PhpParser\Node\Param $param, \PhpParser\Node\FunctionLike $functionLike) : ?string
    {
        $scope = $functionLike->getAttribute(\Rector\NodeTypeResolver\Node\AttributeKey::SCOPE);
        if (!$scope instanceof \PHPStan\Analyser\Scope) {
            // possibly trait
            return null;
        }
        $classReflection = $scope->getClassReflection();
        if (!$classReflection instanceof \PHPStan\Reflection\ClassReflection) {
            return null;
        }
        $paramName = $this->getName($param);
        // If it is the NullableType, extract the name from its inner type
        /** @var Node $paramType */
        $paramType = $param->type;
        if ($param->type instanceof \PhpParser\Node\NullableType) {
            /** @var NullableType $nullableType */
            $nullableType = $paramType;
            $paramTypeName = $this->getName($nullableType->type);
        } else {
            $paramTypeName = $this->getName($paramType);
        }
        if ($paramTypeName === null) {
            return null;
        }
        /** @var string $methodName */
        $methodName = $this->getName($functionLike);
        // parent classes or implemented interfaces
        /** @var ClassReflection[] $parentClassReflections */
        $parentClassReflections = \array_merge($classReflection->getParents(), $classReflection->getInterfaces());
        foreach ($parentClassReflections as $parentClassReflection) {
            if (!$parentClassReflection->hasMethod($methodName)) {
                continue;
            }
            $nativeClassReflection = $parentClassReflection->getNativeReflection();
            // Find the param we're looking for
            $parentReflectionMethod = $nativeClassReflection->getMethod($methodName);
            $differentAncestorParamTypeName = $this->getDifferentParamTypeFromReflectionMethod($parentReflectionMethod, $paramName, $paramTypeName);
            if ($differentAncestorParamTypeName !== null) {
                return $differentAncestorParamTypeName;
            }
        }
        return null;
    }
    private function getDifferentParamTypeFromReflectionMethod(\ReflectionMethod $reflectionMethod, string $paramName, string $paramTypeName) : ?string
    {
        /** @var ReflectionParameter[] $parentReflectionMethodParams */
        $parentReflectionMethodParams = $reflectionMethod->getParameters();
        foreach ($parentReflectionMethodParams as $parentReflectionMethodParam) {
            if ($parentReflectionMethodParam->getName() === $paramName) {
                /**
                 * Getting a ReflectionNamedType works from PHP 7.1 onwards
                 * @see https://www.php.net/manual/en/reflectionparameter.gettype.php#125334
                 */
                $reflectionParamType = $parentReflectionMethodParam->getType();
                /**
                 * If the type is null, we don't have enough information
                 * to check if they are different. Then do nothing
                 */
                if (!$reflectionParamType instanceof \ReflectionNamedType) {
                    continue;
                }
                if ($reflectionParamType->getName() !== $paramTypeName) {
                    // We found it: a different param type in some ancestor
                    return $reflectionParamType->getName();
                }
            }
        }
        return null;
    }
    /**
     * @param ClassMethod|Function_ $functionLike
     */
    private function refactorParam(\PhpParser\Node\Param $param, \PhpParser\Node\FunctionLike $functionLike) : void
    {
        if (!$this->isNullableParam($param, $functionLike)) {
            return;
        }
        $this->decorateWithDocBlock($functionLike, $param);
        $param->type = null;
    }
    /**
     * @param ClassMethod|Function_ $functionLike
     */
    private function decorateWithDocBlock(\PhpParser\Node\FunctionLike $functionLike, \PhpParser\Node\Param $param) : void
    {
        if ($param->type === null) {
            return;
        }
        $type = $this->staticTypeMapper->mapPhpParserNodePHPStanType($param->type);
        $paramName = $this->getName($param->var) ?? '';
        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($functionLike);
        $this->phpDocTypeChanger->changeParamType($phpDocInfo, $type, $param, $paramName);
    }
}
