<?php

declare(strict_types=1);

/**
 * Copyright (c) 2018-2026 Andreas Möller
 *
 * For the full copyright and license information, please view
 * the LICENSE.md file that was distributed with this source code.
 *
 * @see https://github.com/ergebnis/phpstan-rules
 */

namespace Ergebnis\PHPStan\Rules\Classes;

use Ergebnis\PHPStan\Rules\ErrorIdentifier;
use PhpParser\Node;
use PHPStan\Analyser;
use PHPStan\Rules;
use PHPUnit\Framework;

/**
 * @implements Rules\Rule<Node\Stmt\Class_>
 */
final class NoExtendsRule implements Rules\Rule
{
    /**
     * @var list<class-string>
     */
    private static array $defaultClassesAllowedToBeExtended = [
        Framework\TestCase::class,
    ];

    /**
     * @var list<class-string>
     */
    private array $classesAllowedToBeExtended;

    /**
     * @param list<class-string> $classesAllowedToBeExtended
     */
    public function __construct(array $classesAllowedToBeExtended)
    {
        $this->classesAllowedToBeExtended = \array_values(\array_unique(\array_merge(
            self::$defaultClassesAllowedToBeExtended,
            \array_map(static function (string $classAllowedToBeExtended): string {
                /** @var class-string $classAllowedToBeExtended */
                return $classAllowedToBeExtended;
            }, $classesAllowedToBeExtended),
        )));
    }

    public function getNodeType(): string
    {
        return Node\Stmt\Class_::class;
    }

    public function processNode(
        Node $node,
        Analyser\Scope $scope
    ): array {
        if (!$node->extends instanceof Node\Name) {
            return [];
        }

        $extendedClassName = $node->extends->toString();

        if (\in_array($extendedClassName, $this->classesAllowedToBeExtended, true)) {
            return [];
        }

        if (!isset($node->namespacedName)) {
            $message = \sprintf(
                'Anonymous class is not allowed to extend "%s".',
                $extendedClassName,
            );

            return [
                Rules\RuleErrorBuilder::message($message)
                    ->identifier(ErrorIdentifier::noExtends()->toString())
                    ->build(),
            ];
        }

        $extendingClassName = $node->namespacedName->toString();

        $message = \sprintf(
            'Class "%s" is not allowed to extend "%s".',
            $extendingClassName,
            $extendedClassName,
        );

        return [
            Rules\RuleErrorBuilder::message($message)
                ->identifier(ErrorIdentifier::noExtends()->toString())
                ->build(),
        ];
    }
}
