import json
import time

class Params():
  """Class that loads hyperparameters from a json file."""

  def __init__(self, json_path):
    self.update(json_path)

  def save(self, json_path):
    """Saves parameters to json file."""
    with open(json_path, 'w') as f:
      json.dump(self.__dict__, f, indent=4)

  def update(self, json_path):
    """Loads parameters from json file."""
    with open(json_path) as f:
      params = json.load(f)
      self.__dict__.update(params)

  @property
  def dict(self):
    """Gives dict-like access to Params instance."""
    return self.__dict__

class ParamsDict():
  """Class that loads hyperparameters from a json file."""

  def __init__(self, data):
    self.update(data)

  def __setitem__(self, key, item):
    self.__dict__[key] = item

  def __getitem__(self, key):
    return self.__dict__[key]

  def __repr__(self):
    return repr(self.__dict__)

  def __len__(self):
    return len(self.__dict__)

  def __delitem__(self, key):
    del self.__dict__[key]

  def save(self, json_path):
    """Saves parameters to json file."""
    with open(json_path, 'w') as f:
      json.dump(self.__dict__, f, indent=4)

  def update(self, *args, **kwargs):
    return self.__dict__.update(*args, **kwargs)

def timestamp():
  return time.strftime("%Y-%m-%d_%H%M")