# Copyright (c) 2020-2022 by Fraunhofer Institute for Energy Economics
# and Energy System Technology (IEE), Kassel, and University of Kassel. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

import numpy as np
import pytest

import pandapipes
from pandapipes.component_models.component_toolbox import p_correction_height_air


@pytest.mark.parametrize("use_numba", [True, False])
def test_compressor_pressure_ratio(use_numba):

    net = pandapipes.create_empty_network("net", add_stdtypes=True, fluid="hgas")

    j = pandapipes.create_junctions(net, 6, pn_bar=5, tfluid_k=283.15)
    j1, j2, j3, j4, j5, j6 = j

    pandapipes.create_pipe_from_parameters(net, j1, j2, length_km=0.43380, diameter_m=0.1022)
    pandapipes.create_pipe_from_parameters(net, j3, j4, length_km=0.26370, diameter_m=0.1022)
    pandapipes.create_ext_grid(net, j1, 5, 283.15, type="p")
    pandapipes.create_sink(net, j6, 0.02333)

    br1 = 1.5
    br3 = 1.1
    c1 = pandapipes.create_compressor(net, j2, j3, pressure_ratio=br1)
    c2 = pandapipes.create_compressor(net, j5, j4, pressure_ratio=br1)  # reverse flow -> bypass
    c3 = pandapipes.create_compressor(net, j5, j6, pressure_ratio=br3)

    pandapipes.pipeflow(net, use_numba=use_numba)
    net.res_junction["abs_p_bar"] = net.res_junction.p_bar + \
                                    p_correction_height_air(net.junction.height_m)

    assert np.isclose(net.res_junction.at[j3, "abs_p_bar"],
                      br1 * net.res_junction.at[j2, "abs_p_bar"])
    assert np.isclose(net.res_junction.at[j6, "abs_p_bar"],
                      br3 * net.res_junction.at[j5, "abs_p_bar"])
    assert np.isclose(net.res_junction.at[j5, "p_bar"], net.res_junction.at[j4, "p_bar"]), \
        "pressure lift on rev. flow should be 0"
    assert np.isclose(net.res_junction.at[j5, "abs_p_bar"], net.res_junction.at[j4, "abs_p_bar"]), \
        "pressure lift on rev. flow should be 0"
    assert np.isclose(net.res_compressor.at[c1, "deltap_bar"],
                      net.res_junction.at[j2, "abs_p_bar"] * (br1 - 1))
    assert np.isclose(net.res_compressor.at[c3, "deltap_bar"],
                      net.res_junction.at[j5, "abs_p_bar"] * (br3 - 1))
    assert np.isclose(net.res_compressor.at[c2, "deltap_bar"], 0.0), \
        "pressure lift on rev. flow should be 0"

    br_new = 1.3
    net.compressor.loc[c1, "pressure_ratio"] = br_new

    pandapipes.pipeflow(net)
    net.res_junction["abs_p_bar"] = net.res_junction.p_bar + \
                                    p_correction_height_air(net.junction.height_m)

    assert np.isclose(net.res_junction.at[j3, "abs_p_bar"],
                      br_new * net.res_junction.at[j2, "abs_p_bar"])
    assert np.isclose(net.res_compressor.at[c1, "deltap_bar"],
                      net.res_junction.at[j2, "abs_p_bar"] * (br_new - 1))
    assert np.isclose(net.res_junction.at[j5, "abs_p_bar"], net.res_junction.at[j4, "abs_p_bar"])
    assert np.isclose(net.res_compressor.at[c2, "deltap_bar"], 0.0), \
        "pressure lift on rev. flow should be 0"


if __name__ == '__main__':
    n = pytest.main(["test_compressor.py"])