<?php

declare (strict_types=1);
namespace Rector\Core\NodeManipulator;

use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassConst;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Property;
use PHPStan\Type\Type;
use Rector\Core\PhpParser\Node\NodeFactory;
use Rector\NodeTypeResolver\Node\AttributeKey;
final class ClassInsertManipulator
{
    /**
     * @readonly
     * @var \Rector\Core\PhpParser\Node\NodeFactory
     */
    private $nodeFactory;
    public function __construct(NodeFactory $nodeFactory)
    {
        $this->nodeFactory = $nodeFactory;
    }
    /**
     * @api
     * @param \PhpParser\Node\Stmt\Property|\PhpParser\Node\Stmt\ClassConst|\PhpParser\Node\Stmt\ClassMethod $stmt
     */
    public function addAsFirstMethod(Class_ $class, $stmt) : void
    {
        $scope = $class->getAttribute(AttributeKey::SCOPE);
        $stmt->setAttribute(AttributeKey::SCOPE, $scope);
        if ($this->isSuccessToInsertBeforeFirstMethod($class, $stmt)) {
            return;
        }
        if ($this->isSuccessToInsertAfterLastProperty($class, $stmt)) {
            return;
        }
        $class->stmts[] = $stmt;
    }
    /**
     * @internal Use PropertyAdder service instead
     */
    public function addPropertyToClass(Class_ $class, string $name, ?Type $type) : void
    {
        $existingProperty = $class->getProperty($name);
        if ($existingProperty instanceof Property) {
            return;
        }
        $property = $this->nodeFactory->createPrivatePropertyFromNameAndType($name, $type);
        $this->addAsFirstMethod($class, $property);
    }
    /**
     * @param Stmt[] $stmts
     * @return Stmt[]
     */
    private function insertBefore(array $stmts, Stmt $stmt, int $key) : array
    {
        \array_splice($stmts, $key, 0, [$stmt]);
        return $stmts;
    }
    /**
     * @param \PhpParser\Node\Stmt\ClassConst|\PhpParser\Node\Stmt\ClassMethod|\PhpParser\Node\Stmt\Property $stmt
     */
    private function isSuccessToInsertBeforeFirstMethod(Class_ $class, $stmt) : bool
    {
        foreach ($class->stmts as $key => $classStmt) {
            if (!$classStmt instanceof ClassMethod) {
                continue;
            }
            $class->stmts = $this->insertBefore($class->stmts, $stmt, $key);
            return \true;
        }
        return \false;
    }
    /**
     * @param \PhpParser\Node\Stmt\ClassConst|\PhpParser\Node\Stmt\ClassMethod|\PhpParser\Node\Stmt\Property $stmt
     */
    private function isSuccessToInsertAfterLastProperty(Class_ $class, $stmt) : bool
    {
        $previousElement = null;
        foreach ($class->stmts as $key => $classStmt) {
            if ($previousElement instanceof Property && !$classStmt instanceof Property) {
                $class->stmts = $this->insertBefore($class->stmts, $stmt, $key);
                return \true;
            }
            $previousElement = $classStmt;
        }
        return \false;
    }
}
