<?php

declare(strict_types=1);

namespace Symplify\CodingStandard\Rules;

use PhpParser\Node;
use PhpParser\Node\Stmt\ClassLike;
use PhpParser\NodeFinder;
use PHPStan\Analyser\Scope;
use PHPStan\Node\FileNode;

/**
 * @see \Symplify\CodingStandard\Tests\Rules\ForbiddenMultipleClassLikeInOneFileRule\ForbiddenMultipleClassLikeInOneFileRuleTest
 */
final class ForbiddenMultipleClassLikeInOneFileRule extends AbstractSymplifyRule
{
    /**
     * @var string
     */
    public const ERROR_MESSAGE = 'Multiple class/interface/trait is not allowed in a file.';

    /**
     * @var NodeFinder
     */
    private $nodeFinder;

    public function __construct(NodeFinder $nodeFinder)
    {
        $this->nodeFinder = $nodeFinder;
    }

    /**
     * @return string[]
     */
    public function getNodeTypes(): array
    {
        return [FileNode::class];
    }

    /**
     * @param FileNode $node
     * @return string[]
     */
    public function process(Node $node, Scope $scope): array
    {
        /** @var ClassLike[] $classLikes */
        $classLikes = $this->nodeFinder->findInstanceOf($node->getNodes(), ClassLike::class);

        $findclassLikes = [];
        foreach ($classLikes as $classLike) {
            if ($classLike->name === null) {
                continue;
            }

            $findclassLikes[] = $classLike;
        }

        if (count($findclassLikes) <= 1) {
            return [];
        }

        return [self::ERROR_MESSAGE];
    }
}