#################################################################################
# The Institute for the Design of Advanced Energy Systems Integrated Platform
# Framework (IDAES IP) was produced under the DOE Institute for the
# Design of Advanced Energy Systems (IDAES).
#
# Copyright (c) 2018-2023 by the software owners: The Regents of the
# University of California, through Lawrence Berkeley National Laboratory,
# National Technology & Engineering Solutions of Sandia, LLC, Carnegie Mellon
# University, West Virginia University Research Corporation, et al.
# All rights reserved.  Please see the files COPYRIGHT.md and LICENSE.md
# for full copyright and license information.
#################################################################################
"""
Make sure the supercritical steam cycle example solves.
"""

__author__ = "John Eslick"

import os
import pytest
import pyomo.environ as pyo
from pyomo.util.check_units import assert_units_consistent

from idaes.models_extra.power_generation.flowsheets.supercritical_steam_cycle.supercritical_steam_cycle import (
    main,
    pfd_result,
)
from idaes.core.util.model_statistics import (
    degrees_of_freedom,
    activated_equalities_generator,
)
from idaes.models.properties import iapws95
from idaes.core.util.tables import create_stream_table_dataframe  # as Pandas DataFrame
from idaes.models.properties.general_helmholtz import helmholtz_available


@pytest.fixture(scope="module")
def model():
    m, solver = main()
    m.solver = solver

    return m


def gross_power_mw(model):
    # pyo.value(m.fs.turb.power[0]) is the power consumed in Watts
    return -pyo.value(model.fs.turb.power[0]) / 1e6


@pytest.mark.skipif(not helmholtz_available(), reason="General Helmholtz not available")
@pytest.mark.integration
def test_init(model):
    # check that the model solved properly and has 0 degrees of freedom
    assert degrees_of_freedom(model) == 0
    for c in activated_equalities_generator(model):
        assert abs(c.body() - c.lower) < 5e-4


# @pytest.mark.skipif(not helmholtz_available(), reason="General Helmholtz not available")
# @pytest.mark.integration
# def test_unit_consistency(model):
#     assert_units_consistent(model)


@pytest.mark.skipif(not helmholtz_available(), reason="General Helmholtz not available")
@pytest.mark.integration
def test_init_value(model):
    assert gross_power_mw(model) == pytest.approx(622.38, abs=1e-2)
    # Make sure the stream table can be generated.
    df = create_stream_table_dataframe(streams=model._streams, orient="index")
    pfd_result(model, df, None)


@pytest.mark.skipif(not helmholtz_available(), reason="General Helmholtz not available")
@pytest.mark.integration
def test_valve_change(model):
    model.fs.turb.throttle_valve[1].valve_opening[:].value = 0.25
    model.solver.solve(model, tee=True)
    assert gross_power_mw(model) == pytest.approx(594.66, abs=1e-2)
