<?php

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

use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Return_;
use PHPStan\Analyser\Scope;
use PHPStan\PhpDocParser\Ast\Type\GenericTypeNode;
use PHPStan\Reflection\ClassReflection;
use PHPStan\Type\Constant\ConstantArrayType;
use PHPStan\Type\Constant\ConstantStringType;
use PHPStan\Type\NeverType;
use PHPStan\Type\UnionType;
use Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger;
use Rector\BetterPhpDocParser\ValueObject\Type\SpacingAwareArrayTypeNode;
use Rector\Core\Rector\AbstractScopeAwareRector;
use Rector\Core\Util\StringUtils;
use Rector\PhpDocParser\TypeAnalyzer\ClassMethodReturnTypeResolver;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @see \Rector\Tests\TypeDeclaration\Rector\ClassMethod\ArrayShapeFromConstantArrayReturnRector\ArrayShapeFromConstantArrayReturnRectorTest
 */
final class ArrayShapeFromConstantArrayReturnRector extends AbstractScopeAwareRector
{
    /**
     * @readonly
     * @var \Rector\PhpDocParser\TypeAnalyzer\ClassMethodReturnTypeResolver
     */
    private $classMethodReturnTypeResolver;
    /**
     * @readonly
     * @var \Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger
     */
    private $phpDocTypeChanger;
    /**
     * @see https://regex101.com/r/WvUD0m/2
     * @var string
     */
    private const SKIPPED_CHAR_REGEX = '#\\W#u';
    public function __construct(ClassMethodReturnTypeResolver $classMethodReturnTypeResolver, PhpDocTypeChanger $phpDocTypeChanger)
    {
        $this->classMethodReturnTypeResolver = $classMethodReturnTypeResolver;
        $this->phpDocTypeChanger = $phpDocTypeChanger;
    }
    public function getRuleDefinition() : RuleDefinition
    {
        return new RuleDefinition('Add array shape exact types based on constant keys of array', [new CodeSample(<<<'CODE_SAMPLE'
final class SomeClass
{
    public function run(string $name)
    {
        return ['name' => $name];
    }
}
CODE_SAMPLE
, <<<'CODE_SAMPLE'
final class SomeClass
{
    /**
     * @return array{name: string}
     */
    public function run(string $name)
    {
        return ['name' => $name];
    }
}
CODE_SAMPLE
)]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [ClassMethod::class];
    }
    /**
     * @param ClassMethod $node
     */
    public function refactorWithScope(Node $node, Scope $scope) : ?Node
    {
        if ($this->isInTestCase($scope)) {
            return null;
        }
        /** @var Return_[] $returns */
        $returns = $this->betterNodeFinder->findInstancesOfInFunctionLikeScoped($node, Return_::class);
        // exact one shape only
        if (\count($returns) !== 1) {
            return null;
        }
        $return = $returns[0];
        if (!$return->expr instanceof Expr) {
            return null;
        }
        $returnExprType = $this->getType($return->expr);
        if (!$returnExprType instanceof ConstantArrayType) {
            return null;
        }
        if ($this->shouldSkip($returnExprType)) {
            return null;
        }
        $returnType = $this->classMethodReturnTypeResolver->resolve($node, $scope);
        if ($returnType instanceof ConstantArrayType) {
            return null;
        }
        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($node);
        $returnExprTypeNode = $this->staticTypeMapper->mapPHPStanTypeToPHPStanPhpDocTypeNode($returnExprType);
        if ($returnExprTypeNode instanceof GenericTypeNode) {
            return null;
        }
        if ($returnExprTypeNode instanceof SpacingAwareArrayTypeNode) {
            return null;
        }
        $hasChanged = $this->phpDocTypeChanger->changeReturnType($node, $phpDocInfo, $returnExprType);
        if (!$hasChanged) {
            return null;
        }
        return $node;
    }
    private function shouldSkip(ConstantArrayType $constantArrayType) : bool
    {
        $keyType = $constantArrayType->getKeyType();
        // empty array
        if ($keyType instanceof NeverType) {
            return \true;
        }
        $types = $keyType instanceof UnionType ? $keyType->getTypes() : [$keyType];
        foreach ($types as $type) {
            if (!$type instanceof ConstantStringType) {
                continue;
            }
            $value = $type->getValue();
            if (\trim($value) === '') {
                return \true;
            }
            if (StringUtils::isMatch($value, self::SKIPPED_CHAR_REGEX)) {
                return \true;
            }
        }
        $itemType = $constantArrayType->getItemType();
        if ($itemType instanceof ConstantArrayType) {
            return $this->shouldSkip($itemType);
        }
        return \false;
    }
    /**
     * Skip test case, as return methods there are usually with test data only.
     * Those arrays are hand made and return types are getting complex and messy, so this rule should skip it.
     */
    private function isInTestCase(Scope $scope) : bool
    {
        $classReflection = $scope->getClassReflection();
        if (!$classReflection instanceof ClassReflection) {
            return \false;
        }
        return $classReflection->isSubclassOf('PHPUnit\\Framework\\TestCase');
    }
}
