import time


class ElapsedTime:
    def __enter__(self):
        self.start = time.time()
    
    def __exit__(self, type, value, traceback):
        end = time.time()
        print(f"end-s")
        
def elapsed_time(func):
    def wraps(*args, **kwargs):
        started_at = datetime.now()
        
        init_log = f"""
        [Log]
        function name: {func.__name__}
        started      : {started_at}
        """
        init_log = dedent(init_log)
        print(init_log, flush=True)
        
        out = func(*args, **kwargs)
        finished_at = datetime.now()

        finished_log = f"""
        finished    : {finished_at}
        elapsed time : {(finished_at - started_at).total_seconds()} seconds
        """
        finished_log = dedent(finished_log)
        print(finished_log)

        return out

    return wraps