#################################################################################
# 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.
#################################################################################
"""
Tests for Plate Heat Exchnager  unit model.
Author: Akula Paul
"""

import pytest
from pyomo.environ import (
    check_optimal_termination,
    ConcreteModel,
    Param,
    units as pyunits,
    value,
)
from idaes.core import FlowsheetBlock
from idaes.models_extra.column_models.plate_heat_exchanger import (
    PlateHeatExchanger as PHE,
)

from idaes.models.properties.modular_properties.base.generic_property import (
    GenericParameterBlock,
)
from idaes.models_extra.column_models.properties.MEA_solvent import (
    configuration as aqueous_mea,
)
from idaes.core.util.model_statistics import degrees_of_freedom
from idaes.core.util.testing import initialization_tester
from idaes.core.solvers import get_solver
from pyomo.util.check_units import assert_units_consistent, assert_units_equivalent


# -----------------------------------------------------------------------------
# Get default solver for testing
solver = get_solver()


@pytest.mark.unit
def test_config():
    m = ConcreteModel()
    m.fs = FlowsheetBlock(dynamic=False)

    m.fs.hotside_properties = GenericParameterBlock(**aqueous_mea)
    m.fs.coldside_properties = GenericParameterBlock(**aqueous_mea)

    m.fs.unit = PHE(
        passes=4,
        channels_per_pass=12,
        number_of_divider_plates=2,
        hot_side={"property_package": m.fs.hotside_properties},
        cold_side={"property_package": m.fs.coldside_properties},
    )

    # Check unit config arguments
    assert len(m.fs.unit.config) == 9


# -----------------------------------------------------------------------------
class TestPHE(object):
    @pytest.fixture(scope="class")
    def phe(self):
        m = ConcreteModel()
        m.fs = FlowsheetBlock(dynamic=False)

        m.fs.hotside_properties = GenericParameterBlock(**aqueous_mea)
        m.fs.coldside_properties = GenericParameterBlock(**aqueous_mea)

        m.fs.unit = PHE(
            passes=4,
            channels_per_pass=12,
            number_of_divider_plates=2,
            hot_side={"property_package": m.fs.hotside_properties},
            cold_side={"property_package": m.fs.coldside_properties},
        )

        # hot fluid
        m.fs.unit.hot_side_inlet.flow_mol[0].fix(60.54879)
        m.fs.unit.hot_side_inlet.temperature[0].fix(392.23)
        m.fs.unit.hot_side_inlet.pressure[0].fix(202650)
        m.fs.unit.hot_side_inlet.mole_frac_comp[0, "CO2"].fix(0.0158)
        m.fs.unit.hot_side_inlet.mole_frac_comp[0, "H2O"].fix(0.8747)
        m.fs.unit.hot_side_inlet.mole_frac_comp[0, "MEA"].fix(0.1095)

        # cold fluid
        m.fs.unit.cold_side_inlet.flow_mol[0].fix(63.01910)
        m.fs.unit.cold_side_inlet.temperature[0].fix(326.36)
        m.fs.unit.cold_side_inlet.pressure[0].fix(202650)
        m.fs.unit.cold_side_inlet.mole_frac_comp[0, "CO2"].fix(0.0414)
        m.fs.unit.cold_side_inlet.mole_frac_comp[0, "H2O"].fix(0.8509)
        m.fs.unit.cold_side_inlet.mole_frac_comp[0, "MEA"].fix(0.1077)

        # Fix unit geometry - default values should be correct
        m.fs.unit.plate_length.fix()
        m.fs.unit.plate_width.fix()
        m.fs.unit.plate_thickness.fix()
        m.fs.unit.plate_pact_length.fix()
        m.fs.unit.port_diameter.fix()
        m.fs.unit.plate_therm_cond.fix()
        m.fs.unit.area.fix()

        return m

    @pytest.mark.build
    @pytest.mark.unit
    def test_build(self, phe):

        assert hasattr(phe.fs.unit, "hot_side_inlet")
        assert len(phe.fs.unit.hot_side_inlet.vars) == 4
        assert hasattr(phe.fs.unit.hot_side_inlet, "flow_mol")
        assert hasattr(phe.fs.unit.hot_side_inlet, "mole_frac_comp")
        assert hasattr(phe.fs.unit.hot_side_inlet, "temperature")
        assert hasattr(phe.fs.unit.hot_side_inlet, "pressure")

        assert hasattr(phe.fs.unit, "hot_side_outlet")
        assert len(phe.fs.unit.hot_side_outlet.vars) == 4
        assert hasattr(phe.fs.unit.hot_side_outlet, "flow_mol")
        assert hasattr(phe.fs.unit.hot_side_outlet, "mole_frac_comp")
        assert hasattr(phe.fs.unit.hot_side_outlet, "temperature")
        assert hasattr(phe.fs.unit.hot_side_outlet, "pressure")

        assert hasattr(phe.fs.unit, "cold_side_inlet")
        assert len(phe.fs.unit.cold_side_inlet.vars) == 4
        assert hasattr(phe.fs.unit.cold_side_inlet, "flow_mol")
        assert hasattr(phe.fs.unit.cold_side_inlet, "mole_frac_comp")
        assert hasattr(phe.fs.unit.cold_side_inlet, "temperature")
        assert hasattr(phe.fs.unit.cold_side_inlet, "pressure")

        assert hasattr(phe.fs.unit, "cold_side_outlet")
        assert len(phe.fs.unit.cold_side_outlet.vars) == 4
        assert hasattr(phe.fs.unit.cold_side_outlet, "flow_mol")
        assert hasattr(phe.fs.unit.cold_side_outlet, "mole_frac_comp")
        assert hasattr(phe.fs.unit.cold_side_outlet, "temperature")
        assert hasattr(phe.fs.unit.cold_side_outlet, "pressure")

        assert hasattr(phe.fs.unit.cold_side, "deltaP")
        assert hasattr(phe.fs.unit.hot_side, "deltaP")

        assert isinstance(phe.fs.unit.number_of_passes, Param)
        assert isinstance(phe.fs.unit.channels_per_pass, Param)

    @pytest.mark.component
    def test_units(self, phe):
        assert_units_equivalent(phe.fs.unit.Re_hot[0], pyunits.dimensionless)
        assert_units_equivalent(phe.fs.unit.Re_cold[0], pyunits.dimensionless)
        assert_units_consistent(phe)

    @pytest.mark.unit
    def test_dof(self, phe):
        assert degrees_of_freedom(phe) == 0

    @pytest.mark.solver
    @pytest.mark.skipif(solver is None, reason="Solver not available")
    @pytest.mark.component
    def test_initialize(self, phe):
        initialization_tester(
            phe, duty=(245000, pyunits.W), optarg={"bound_push": 1e-8, "mu_init": 1e-8}
        )

    @pytest.mark.solver
    @pytest.mark.skipif(solver is None, reason="Solver not available")
    @pytest.mark.component
    def test_solve(self, phe):
        results = solver.solve(phe)

        # Check for optimal solution
        assert check_optimal_termination(results)

    @pytest.mark.solver
    @pytest.mark.skipif(solver is None, reason="Solver not available")
    @pytest.mark.component
    def test_solution(self, phe):
        # phe.fs.unit.display()
        assert pytest.approx(182244.65, rel=1e-5) == value(
            phe.fs.unit.hot_side_outlet.pressure[0]
        )
        assert pytest.approx(177366.53, rel=1e-5) == value(
            phe.fs.unit.cold_side_outlet.pressure[0]
        )

        assert pytest.approx(685.730, rel=1e-5) == value(phe.fs.unit.Re_hot[0])
        assert pytest.approx(196.018, rel=1e-5) == value(phe.fs.unit.Re_cold[0])
        assert pytest.approx(4.55441, rel=1e-5) == value(phe.fs.unit.Pr_hot[0])
        assert pytest.approx(15.0566, rel=1e-5) == value(phe.fs.unit.Pr_cold[0])
        assert pytest.approx(3691.35, rel=1e-5) == value(
            phe.fs.unit.heat_transfer_coefficient_hot_side[0]
        )
        assert pytest.approx(2610.81, rel=1e-5) == value(
            phe.fs.unit.heat_transfer_coefficient_cold_side[0]
        )
        assert pytest.approx(1170.34, rel=1e-5) == value(
            phe.fs.unit.heat_transfer_coefficient[0]
        )

        assert pytest.approx(24.4118, rel=1e-5) == value(phe.fs.unit.NTU[0])
        assert pytest.approx(0.971227, rel=1e-5) == value(phe.fs.unit.Cratio[0])
        assert pytest.approx(0.676902, rel=1e-5) == value(phe.fs.unit.effectiveness[0])

        assert pytest.approx(244327, rel=1e-5) == value(phe.fs.unit.heat_duty[0])

        assert pytest.approx(345.612, rel=1e-5) == value(
            phe.fs.unit.hot_side_outlet.temperature[0]
        )
        assert pytest.approx(372.776, rel=1e-5) == value(
            phe.fs.unit.cold_side_outlet.temperature[0]
        )

    @pytest.mark.solver
    @pytest.mark.skipif(solver is None, reason="Solver not available")
    @pytest.mark.component
    def test_conservation(self, phe):
        # Mass conservation test
        assert (
            abs(
                value(
                    phe.fs.unit.hot_side_inlet.flow_mol[0]
                    - phe.fs.unit.hot_side_outlet.flow_mol[0]
                )
            )
            <= 2e-6
        )

        for j in phe.fs.hotside_properties.apparent_species_set:
            assert (
                abs(
                    value(
                        phe.fs.unit.hot_side_inlet.flow_mol[0]
                        * phe.fs.unit.hot_side_inlet.mole_frac_comp[0, j]
                        - phe.fs.unit.hot_side_outlet.flow_mol[0]
                        * phe.fs.unit.hot_side_outlet.mole_frac_comp[0, j]
                    )
                )
                <= 2e-6
            )

        assert (
            abs(
                value(
                    phe.fs.unit.cold_side_inlet.flow_mol[0]
                    - phe.fs.unit.cold_side_outlet.flow_mol[0]
                )
            )
            <= 2e-6
        )

        for j in phe.fs.coldside_properties.apparent_species_set:
            assert (
                abs(
                    value(
                        phe.fs.unit.cold_side_inlet.flow_mol[0]
                        * phe.fs.unit.cold_side_inlet.mole_frac_comp[0, j]
                        - phe.fs.unit.cold_side_outlet.flow_mol[0]
                        * phe.fs.unit.cold_side_outlet.mole_frac_comp[0, j]
                    )
                )
                <= 2e-6
            )

        # Energy conservation test
        assert (
            abs(
                value(
                    phe.fs.unit.hot_side.properties_in[0]._enthalpy_flow_term["Liq"]
                    + phe.fs.unit.cold_side.properties_in[0]._enthalpy_flow_term["Liq"]
                    - phe.fs.unit.hot_side.properties_out[0]._enthalpy_flow_term["Liq"]
                    - phe.fs.unit.cold_side.properties_out[0]._enthalpy_flow_term["Liq"]
                )
            )
            <= 2e-6
        )

    # @pytest.mark.ui
    # @pytest.mark.unit
    # def test_report(self, phe):
    #     phe.fs.unit.report()
