import ast
import random
import string

class RenameVisitor(ast.NodeTransformer):
    def __init__(self):
        self.mapping = {}

    def random_name(self, length=8):
        return ''.join(random.choices(string.ascii_letters, k=length))

    def visit_FunctionDef(self, node):
        old_name = node.name
        new_name = self.random_name()
        self.mapping[old_name] = new_name
        node.name = new_name
        self.generic_visit(node)
        return node

    def visit_Name(self, node):
        if node.id in self.mapping:
            node.id = self.mapping[node.id]
        return node

def flatten_control_flow(source_code: str) -> str:
    # Placeholder for control flow flattening
    # For now, just return source_code unchanged
    return source_code

def obfuscate_ast(source_code: str) -> str:
    tree = ast.parse(source_code)
    renamer = RenameVisitor()
    tree = renamer.visit(tree)
    ast.fix_missing_locations(tree)
    return ast.unparse(tree)
