import os
import unittest
from pathlib import Path
from .pytest_common import pushd, create_black_oil_simulator, create_gas_water_simulator, create_onephase_simulator

class TestBasic(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        test_dir = Path(os.path.dirname(__file__))
        cls.data_dir_bo = test_dir.parent.joinpath("test_data/SPE1CASE1a")
        cls.data_dir_op = test_dir.parent.joinpath("test_data/SPE1CASE1")
        cls.data_dir_gw = test_dir.parent.joinpath("test_data/SPE1CASE2")

    # IMPORTANT: Since all the python unittests run in the same process we must be
    #  careful to not call MPI_Init() more than once.
    #  Tests are run alphabetically, so we need to make sure that
    #  the the first test calls MPI_Init(), therefore the name of the tests
    #  have a numeric label like "01" in test_01_bo to ensure that they
    #  are run in a given order.

    # IMPORTANT:This test must be run first since it calls MPI_Init()
    def test_01_blackoil(self):
        with pushd(self.data_dir_bo):
            sim = create_black_oil_simulator(filename="SPE1CASE1.DATA")
            sim.setup_mpi(True, False)
            sim.step_init()
            sim.step()
            oil_pressure = sim.get_fluidstate_variable(name='po')
            self.assertAlmostEqual(oil_pressure[0], 35795160.67, delta=1e4, msg='value of oil pressure')
            gas_pressure = sim.get_fluidstate_variable(name='pg')
            self.assertAlmostEqual(gas_pressure[0], 35795160.67, delta=1e4, msg='value of gas pressure')
            water_pressure = sim.get_fluidstate_variable(name='pw')
            self.assertAlmostEqual(water_pressure[0], 35795160.67, delta=1e4, msg='value of water pressure')
            rho_w = sim.get_fluidstate_variable(name='rho_w')
            self.assertAlmostEqual(rho_w[0], 998.9822355, places=3, msg='value of water density')
            rho_g = sim.get_fluidstate_variable(name='rho_g')
            self.assertAlmostEqual(rho_g[0], 241.36955087, places=2, msg='value of gas density')
            rho_o = sim.get_fluidstate_variable(name='rho_o')
            self.assertAlmostEqual(rho_o[0], 631.78674, places=2, msg='value of oil density')
            Rs = sim.get_fluidstate_variable(name='Rs')
            self.assertAlmostEqual(Rs[0], 226.19666048, places=5, msg='value of solution gas-oil ratio')
            Rv = sim.get_fluidstate_variable(name='Rv')
            self.assertAlmostEqual(Rv[0], 0.0, places=5, msg='value of volatile gas-oil ratio')
            Sw = sim.get_fluidstate_variable(name='Sw')
            self.assertAlmostEqual(Sw[0], 0.11969486712, places=5, msg='value of water saturation')
            So = sim.get_fluidstate_variable(name='So')
            self.assertAlmostEqual(So[0], 0.825129, places=3, msg='value of oil saturation')
            Sg = sim.get_fluidstate_variable(name='Sg')
            self.assertAlmostEqual(Sg[0], 0.055138968544, places=3, msg='value of gas saturation')
            T = sim.get_fluidstate_variable(name='T')
            self.assertAlmostEqual(T[0], 288.705, places=3, msg='value of temperature')

    def test_02_onephase(self):
        with pushd(self.data_dir_op):
            sim = create_onephase_simulator("SPE1CASE1_WATER.DATA")
            sim.setup_mpi(False, False)
            sim.step_init()
            sim.step()
            water_pressure = sim.get_fluidstate_variable(name='pw')
            self.assertAlmostEqual(water_pressure[0], 44780102.277570, delta=1e4, msg='value of water pressure')
            rho_w = sim.get_fluidstate_variable(name='rho_w')
            self.assertAlmostEqual(rho_w[0], 1003.182858, places=3, msg='value of water density')
            Sw = sim.get_fluidstate_variable(name='Sw')
            self.assertAlmostEqual(Sw[0], 1.0, places=5, msg='value of water saturation')

    # IMPORTANT: This test must be run last since it calls MPI_Finalize()
    def test_99_gaswater(self):
        with pushd(self.data_dir_gw):
            sim = create_gas_water_simulator(filename="SPE1CASE2_GASWATER.DATA")
            sim.setup_mpi(False, True)
            sim.step_init()
            sim.step()
            gas_pressure = sim.get_fluidstate_variable(name='pg')
            self.assertAlmostEqual(gas_pressure[0], 32410549.874824, delta=1e4, msg='value of gas pressure')
            water_pressure = sim.get_fluidstate_variable(name='pw')
            self.assertAlmostEqual(water_pressure[0], 32410549.874824, delta=1e4, msg='value of water pressure')
            rho_g = sim.get_fluidstate_variable(name='rho_g')
            self.assertAlmostEqual(rho_g[0], 219.613424, delta=1e-2, msg='value of gas density')
            rho_w = sim.get_fluidstate_variable(name='rho_w')
            self.assertAlmostEqual(rho_w[0], 1047.849235, delta=1e-3, msg='value of water density')
            Sg = sim.get_fluidstate_variable(name='Sg')
            self.assertAlmostEqual(Sg[0], 0.708648, delta=1e-2, msg='value of gas saturation')
            Sw = sim.get_fluidstate_variable(name='Sw')
            self.assertAlmostEqual(Sw[0], 0.291351, delta=1e-2, msg='value of water saturation')