<?php

declare (strict_types=1);
namespace Rector\Symfony\Symfony44\Rector\ClassMethod;

use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\BinaryOp\Coalesce;
use PhpParser\Node\Expr\Cast\Int_;
use PhpParser\Node\Expr\Ternary;
use PhpParser\Node\FunctionLike;
use PhpParser\Node\Identifier;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Return_;
use PhpParser\NodeVisitor;
use PHPStan\Type\IntegerType;
use PHPStan\Type\ObjectType;
use Rector\NodeAnalyzer\TerminatedNodeAnalyzer;
use Rector\PhpParser\Node\Value\ValueResolver;
use Rector\Rector\AbstractRector;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @changelog https://github.com/symfony/symfony/pull/33775/files
 * @see \Rector\Symfony\Tests\Symfony44\Rector\ClassMethod\ConsoleExecuteReturnIntRector\ConsoleExecuteReturnIntRectorTest
 */
final class ConsoleExecuteReturnIntRector extends AbstractRector
{
    /**
     * @readonly
     */
    private TerminatedNodeAnalyzer $terminatedNodeAnalyzer;
    /**
     * @readonly
     */
    private ValueResolver $valueResolver;
    private bool $hasChanged = \false;
    public function __construct(TerminatedNodeAnalyzer $terminatedNodeAnalyzer, ValueResolver $valueResolver)
    {
        $this->terminatedNodeAnalyzer = $terminatedNodeAnalyzer;
        $this->valueResolver = $valueResolver;
    }
    public function getRuleDefinition() : RuleDefinition
    {
        return new RuleDefinition('Returns int from Command::execute() command', [new CodeSample(<<<'CODE_SAMPLE'
use Symfony\Component\Console\Command\Command;

class SomeCommand extends Command
{
    public function execute(InputInterface $input, OutputInterface $output)
    {
        return null;
    }
}
CODE_SAMPLE
, <<<'CODE_SAMPLE'
use Symfony\Component\Console\Command\Command;

class SomeCommand extends Command
{
    public function execute(InputInterface $input, OutputInterface $output): int
    {
        return 0;
    }
}
CODE_SAMPLE
)]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [Class_::class];
    }
    /**
     * @param Class_ $node
     */
    public function refactor(Node $node) : ?Node
    {
        if (!$this->isObjectType($node, new ObjectType('Symfony\\Component\\Console\\Command\\Command'))) {
            return null;
        }
        $executeClassMethod = $node->getMethod('execute');
        if (!$executeClassMethod instanceof ClassMethod) {
            return null;
        }
        $this->refactorReturnTypeDeclaration($executeClassMethod);
        $this->addReturn0ToExecuteClassMethod($executeClassMethod);
        if ($this->hasChanged) {
            return $node;
        }
        return null;
    }
    private function refactorReturnTypeDeclaration(ClassMethod $classMethod) : void
    {
        // already set
        if ($classMethod->returnType instanceof Node && $this->isName($classMethod->returnType, 'int')) {
            return;
        }
        $classMethod->returnType = new Identifier('int');
        $this->hasChanged = \true;
    }
    private function addReturn0ToExecuteClassMethod(ClassMethod $classMethod) : void
    {
        if ($classMethod->stmts === null) {
            return;
        }
        $this->traverseNodesWithCallable($classMethod->stmts, function (Node $node) : ?int {
            // skip anonymous class/function
            if ($node instanceof FunctionLike || $node instanceof Class_) {
                return NodeVisitor::DONT_TRAVERSE_CURRENT_AND_CHILDREN;
            }
            if (!$node instanceof Return_) {
                return null;
            }
            if ($this->isReturnIntegerType($node->expr)) {
                return null;
            }
            if ($node->expr instanceof Ternary && $this->isIntegerTernaryIfElse($node->expr)) {
                return null;
            }
            $this->setReturnTo0InsteadOfNull($node);
            return null;
        });
        $this->processReturn0ToMethod($classMethod);
    }
    private function isReturnIntegerType(?Expr $expr) : bool
    {
        if ($expr instanceof Int_) {
            return \true;
        }
        if ($expr instanceof Expr) {
            $returnedType = $this->getType($expr);
            if ($returnedType instanceof IntegerType) {
                return \true;
            }
        }
        return \false;
    }
    private function isIntegerTernaryIfElse(Ternary $ternary) : bool
    {
        /** @var Expr|null $if */
        $if = $ternary->if;
        if (!$if instanceof Expr) {
            $if = $ternary->cond;
        }
        /** @var Expr $else */
        $else = $ternary->else;
        $ifType = $this->getType($if);
        $elseType = $this->getType($else);
        return $ifType instanceof IntegerType && $elseType instanceof IntegerType;
    }
    private function processReturn0ToMethod(ClassMethod $classMethod) : void
    {
        $lastKey = \array_key_last((array) $classMethod->stmts);
        $return = new Return_(new \PhpParser\Node\Scalar\Int_(0));
        if ($lastKey !== null && (isset($classMethod->stmts[$lastKey]) && $this->terminatedNodeAnalyzer->isAlwaysTerminated($classMethod, $classMethod->stmts[$lastKey], $return))) {
            return;
        }
        $classMethod->stmts[] = $return;
    }
    private function setReturnTo0InsteadOfNull(Return_ $return) : void
    {
        if (!$return->expr instanceof Expr) {
            $return->expr = new \PhpParser\Node\Scalar\Int_(0);
            return;
        }
        if ($this->valueResolver->isNull($return->expr)) {
            $return->expr = new \PhpParser\Node\Scalar\Int_(0);
            return;
        }
        if ($return->expr instanceof Coalesce && $this->valueResolver->isNull($return->expr->right)) {
            $return->expr->right = new \PhpParser\Node\Scalar\Int_(0);
            return;
        }
        if ($return->expr instanceof Ternary) {
            $hasChanged = $this->isSuccessfulRefactorTernaryReturn($return->expr);
            if ($hasChanged) {
                return;
            }
        }
        $staticType = $this->getType($return->expr);
        if (!$staticType instanceof IntegerType) {
            $return->expr = new Int_($return->expr);
        }
    }
    private function isSuccessfulRefactorTernaryReturn(Ternary $ternary) : bool
    {
        $hasChanged = \false;
        if ($ternary->if instanceof Expr && $this->valueResolver->isNull($ternary->if)) {
            $ternary->if = new \PhpParser\Node\Scalar\Int_(0);
            $hasChanged = \true;
        }
        if ($this->valueResolver->isNull($ternary->else)) {
            $ternary->else = new \PhpParser\Node\Scalar\Int_(0);
            $hasChanged = \true;
        }
        return $hasChanged;
    }
}
