import os

import gym
from gym.spaces.box import Box

from baselines import bench
from baselines.common.atari_wrappers import wrap_deepmind


def make_env(env_id, seed, rank, log_dir):
    def _thunk():
        if env_id.find('Bullet') > -1:
            import pybullet_envs
            env = pybullet_envs.make(env_id)
        else:
            env = gym.make(env_id)
        env.seed(seed + rank)
        env = bench.Monitor(env,
                            os.path.join(log_dir,
                                         "{}.monitor.json".format(rank)))
        # Ugly hack to detect atari.
        if env.action_space.__class__.__name__ == 'Discrete':
            env = wrap_deepmind(env)
            env = WrapPyTorch(env)
        return env

    return _thunk


class WrapPyTorch(gym.ObservationWrapper):
    def __init__(self, env=None):
        super(WrapPyTorch, self).__init__(env)
        self.observation_space = Box(0.0, 1.0, [1, 84, 84])

    def _observation(self, observation):
        return observation.transpose(2, 0, 1)