import os
import tempfile
import pytest

import mlagents.trainers.tensorflow_to_barracuda as tf2bc
from mlagents.trainers.tests.test_nn_policy import create_policy_mock
from mlagents.trainers.settings import TrainerSettings
from mlagents.tf_utils import tf
from mlagents.model_serialization import SerializationSettings, export_policy_model


def test_barracuda_converter():
    path_prefix = os.path.dirname(os.path.abspath(__file__))
    tmpfile = os.path.join(
        tempfile._get_default_tempdir(), next(tempfile._get_candidate_names()) + ".nn"
    )

    # make sure there are no left-over files
    if os.path.isfile(tmpfile):
        os.remove(tmpfile)

    tf2bc.convert(path_prefix + "/BasicLearning.pb", tmpfile)

    # test if file exists after conversion
    assert os.path.isfile(tmpfile)
    # currently converter produces small output file even if input file is empty
    # 100 bytes is high enough to prove that conversion was successful
    assert os.path.getsize(tmpfile) > 100

    # cleanup
    os.remove(tmpfile)


@pytest.mark.parametrize("discrete", [True, False], ids=["discrete", "continuous"])
@pytest.mark.parametrize("visual", [True, False], ids=["visual", "vector"])
@pytest.mark.parametrize("rnn", [True, False], ids=["rnn", "no_rnn"])
def test_policy_conversion(tmpdir, rnn, visual, discrete):
    tf.reset_default_graph()
    dummy_config = TrainerSettings(output_path=os.path.join(tmpdir, "test"))
    policy = create_policy_mock(
        dummy_config, use_rnn=rnn, use_discrete=discrete, use_visual=visual
    )
    policy.save_model(1000)
    settings = SerializationSettings(
        policy.model_path, os.path.join(tmpdir, policy.brain.brain_name)
    )
    export_policy_model(settings, policy.graph, policy.sess)

    # These checks taken from test_barracuda_converter
    assert os.path.isfile(os.path.join(tmpdir, "test.nn"))
    assert os.path.getsize(os.path.join(tmpdir, "test.nn")) > 100