#   Copyright 2020 Google LLC

#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
""" fci_graph_set unit tests: load reference data
"""
import os
import numpy
import pickle
from fqe.fci_graph import FciGraph
from fqe.fci_graph_set import FciGraphSet


def loader(np, nalpha, nbeta, norb):
    filename = "set{:02d}{:02d}{:02d}{:02d}.pickle".format(
        np, nalpha, nbeta, norb)
    datadir = os.path.join(os.path.dirname(os.path.abspath(__file__)),
                           'fci_graph_set')
    with open(os.path.join(datadir, filename), 'rb') as f:
        return pickle.load(f)
