class ClassHelper

class ClassHelper {
    public static function getClassPointer(File $phpcsFile, int $pointer) : ?int {
        $tokens = $phpcsFile->getTokens();
        $classPointers = array_reverse(self::getAllClassPointers($phpcsFile));
        foreach ($classPointers as $classPointer) {
            if ($tokens[$classPointer]['scope_opener'] < $pointer && $tokens[$classPointer]['scope_closer'] > $pointer) {
                return $classPointer;
            }
        }
        return null;
    }
    public static function isFinal(File $phpcsFile, int $classPointer) : bool {
        return $phpcsFile->getTokens()[TokenHelper::findPreviousEffective($phpcsFile, $classPointer - 1)]['code'] === T_FINAL;
    }
    public static function getFullyQualifiedName(File $phpcsFile, int $classPointer) : string {
        $className = self::getName($phpcsFile, $classPointer);
        $tokens = $phpcsFile->getTokens();
        if ($tokens[$classPointer]['code'] === T_ANON_CLASS) {
            return $className;
        }
        $name = sprintf('%s%s', NamespaceHelper::NAMESPACE_SEPARATOR, $className);
        $namespace = NamespaceHelper::findCurrentNamespaceName($phpcsFile, $classPointer);
        return $namespace !== null ? sprintf('%s%s%s', NamespaceHelper::NAMESPACE_SEPARATOR, $namespace, $name) : $name;
    }
    public static function getName(File $phpcsFile, int $classPointer) : string {
        $tokens = $phpcsFile->getTokens();
        if ($tokens[$classPointer]['code'] === T_ANON_CLASS) {
            return 'class@anonymous';
        }
        return $tokens[TokenHelper::findNext($phpcsFile, T_STRING, $classPointer + 1, $tokens[$classPointer]['scope_opener'])]['content'];
    }
    
    /**
     * @return array<int, string>
     */
    public static function getAllNames(File $phpcsFile) : array {
        $tokens = $phpcsFile->getTokens();
        $names = [];
        
        /** @var int $classPointer */
        foreach (self::getAllClassPointers($phpcsFile) as $classPointer) {
            if ($tokens[$classPointer]['code'] === T_ANON_CLASS) {
                continue;
            }
            $names[$classPointer] = self::getName($phpcsFile, $classPointer);
        }
        return $names;
    }
    
    /**
     * @return list<int>
     */
    public static function getTraitUsePointers(File $phpcsFile, int $classPointer) : array {
        $useStatements = [];
        $tokens = $phpcsFile->getTokens();
        $scopeLevel = $tokens[$classPointer]['level'] + 1;
        for ($i = $tokens[$classPointer]['scope_opener'] + 1; $i < $tokens[$classPointer]['scope_closer']; $i++) {
            if ($tokens[$i]['code'] !== T_USE) {
                continue;
            }
            if ($tokens[$i]['level'] !== $scopeLevel) {
                continue;
            }
            $useStatements[] = $i;
        }
        return $useStatements;
    }
    
    /**
     * @return list<int>
     */
    private static function getAllClassPointers(File $phpcsFile) : array {
        $lazyValue = static function () use ($phpcsFile) : array {
            return TokenHelper::findNextAll($phpcsFile, TokenHelper::$typeWithAnonymousClassKeywordTokenCodes, 0);
        };
        return SniffLocalCache::getAndSetIfNotCached($phpcsFile, 'classPointers', $lazyValue);
    }

}