import os
import sys
import time
from amuse_phigrape.interface import PhiGRAPEInterface, PhiGRAPE

from amuse.support.testing.amusetest import TestWithMPI

import numpy
from amuse.units import nbody_system
from amuse.units import units
from amuse import datamodel
from amuse.ic.plummer import new_plummer_model
try:
    import matplotlib
    matplotlib.use("Agg")
    from matplotlib import pyplot
    HAS_MATPLOTLIB = True
except ImportError:
    HAS_MATPLOTLIB = False

default_test_options = dict()
# ~default_test_options = dict(mode='gpu')


class TestMPIInterface(TestWithMPI):

    def test0(self):
        instance = PhiGRAPEInterface(**default_test_options)
        self.assertTrue("Harfst, S., Gualandris, A., Merritt, D., Spurzem, R., Portegies Zwart, S., & Berczik, P."
            in instance.all_literature_references_string())
        instance.stop()

    def test1(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        instance.new_particle(11.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.0)
        retrieved_state = instance.get_state(1)
        self.assertEqual(11.0,  retrieved_state['mass'])
        self.assertEqual(2.0, retrieved_state['radius'])
        self.assertEqual(instance.get_number_of_particles()['number_of_particles'], 1)
        instance.cleanup_code()
        instance.stop()

    def test2(self):
        instance = PhiGRAPEInterface(**default_test_options)
        for x in [0.101, 4.0]:
            error = instance.set_eps2(x)
            self.assertEqual(error, 0)
            value, error = instance.get_eps2()
            self.assertEqual(error, 0)
            self.assertEqual(x, value)
        instance.cleanup_code()
        instance.stop()

    def test3(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()

        instance.new_particle([11.0, 12.0, 13.0, 14.0], [2.1, 3.1, 4.1, 5.1], [2.2, 3.2, 4.2, 5.2], [2.3, 3.3, 4.3, 5.3], [2.4, 3.4, 4.4, 5.4], [2.5, 3.5, 4.5, 5.5], [2.6, 3.6, 4.6, 5.6], [2.0, 3.0, 4.0, 5.0])
        retrieved_state = instance.get_state(1)
        self.assertEqual(11.0,  retrieved_state['mass'])
        retrieved_state = instance.get_state([2, 3, 4])
        self.assertEqual(12.0,  retrieved_state['mass'][0])
        self.assertEqual(instance.get_number_of_particles()['number_of_particles'], 4)
        instance.cleanup_code()
        instance.stop()

    def test5(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        n = 4000
        ids = [i for i in range(1, n)]
        values = [1.0 * i for i in range(1, n)]
        instance.new_particle(
              values, values, values, values, values, values, values)
        retrieved_state = instance.get_state(3999)
        self.assertEqual(3999.0,  retrieved_state['mass'])
        instance.cleanup_code()
        instance.stop()

    def test6(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        n = 4000
        ids = [i for i in range(1, n)]
        values = [1.0 * i for i in range(1, n)]
        for i in range(n-1):
            instance.new_particle(
                  values[i], values[i], values[i], values[i], values[i], values[i], values[i])

        retrieved_state = instance.get_state(1)
        self.assertEqual(1.0,  retrieved_state['mass'])
        instance.cleanup_code()
        instance.stop()

    def test7(self):
        instance = PhiGRAPEInterface(**default_test_options)  # (debugger="xterm")
        instance.initialize_code()

        instance.set_eps2(0.0**2)
        instance.set_eta(0.01, 0.02)
        instance.commit_parameters()

        instance.new_particle(
            [1.0, 1.0, 1.0],
            [1.0, 0.0, -1.0],
            [0.0, 0.0, 0.0],
            [0.0, 0.0, 0.0],
            [0.0, 1.0, 0.0],
            [0.0, 0.0, 0.0],
            [0.0, 0.0, 0.0])
        instance.recommit_particles()
        Ep = instance.get_potential_energy()['potential_energy']
        Ek = instance.get_kinetic_energy()['kinetic_energy']
        self.assertEqual(Ek, 0.5)
        self.assertEqual(Ep, -2.5)
        instance.delete_particle(2)
        instance.recommit_particles()
        n = instance.get_number_of_particles()['number_of_particles']
        Ep = instance.get_potential_energy()['potential_energy']
        Ek = instance.get_kinetic_energy()['kinetic_energy']

        self.assertEqual(n, 2)
        self.assertEqual(Ek, 0.)
        self.assertEqual(Ep, -0.5)

        instance.cleanup_code()
        instance.stop()

    def xtest8(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        instance.set_eps2(0.0**2)
        instance.set_eta(0.01, 0.02)
        instance.new_particle(
            [0.01, 0.01],
            [10., -10.],
            [0.0, 0.0],
            [0.0, 0.0],
            [-5.0, 5.0],
            [0.0, 0.0],
            [0.0, 0.0],
            [0.1, 0.1])
        instance.commit_particles()
        # HAS NO RESULT...
        result = instance.evolve_model(3.14159)

        tnow = instance.get_time()['time']
        print("after evolve(pi), tnow = %f" % (tnow))
        # self.assertEqual( id1, 1)
        """
        instance.evolve(instance.get_time(),1)
        id2=instance.find_colliding_secondary(id1)
        self.assertEqual( id2, 2)
        self.assertAlmostEqual( tnow, 2.,2)
        state1 = instance.get_state(id1)
        state2 = instance.get_state(id2)
        self.assertTrue( abs(state1['x'] - state2['x'])<0.2)
        """
        instance.cleanup_code()
        instance.stop()

    def test8(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        instance.set_eps2(0.1**2)
        instance.commit_parameters()
        id1, errorcode = instance.new_particle(mass=10.0, radius=1.0,
            x=0.0, y=0.0, z=0.0, vx=0.0, vy=0.0, vz=0.0)
        id2, errorcode = instance.new_particle(mass=10.0, radius=1.0,
            x=2.0, y=0.0, z=0.0, vx=10.0, vy=0.0, vz=0.0)

        instance.commit_particles()
        potential, errorcode = instance.get_potential(id1)
        self.assertEqual(errorcode, 0)
        self.assertAlmostRelativeEquals(potential, -10.0 / numpy.sqrt(2.0**2 + 0.1**2), 6)
        total_potential, errorcode = instance.get_potential_energy()
        self.assertEqual(errorcode, 0)
        potentials, errorcode = instance.get_potential([id1, id2])
        instance.cleanup_code()
        instance.stop()
        self.assertEqual(errorcode, 0)
        self.assertAlmostRelativeEquals(total_potential, numpy.sum(potentials * [10.0, 10.0]) / 2.0)

    def test9(self):
        instance = PhiGRAPEInterface(**default_test_options)
        instance.initialize_code()
        instance.set_eps2(0)
        instance.commit_parameters()
        id1, errorcode = instance.new_particle(mass=10.0, radius=1.0, x=0.0, y=0.0, z=0.0, vx=0.0, vy=0.0, vz=0.0)
        id2, errorcode = instance.new_particle(mass=1.0, radius=1.0, x=2.0, y=0.0, z=0.0, vx=10.0, vy=0.0, vz=0.0)

        instance.commit_particles()
        potential, errorcode = instance.get_potential(id1)
        self.assertEqual(errorcode, 0)
        self.assertAlmostRelativeEquals(potential,  -1.0 / numpy.sqrt(2.0**2), 8)
        total_potential, errorcode = instance.get_potential_energy()
        potentials, errorcode = instance.get_potential([id1, id2])
        instance.cleanup_code()
        instance.stop()

        self.assertAlmostRelativeEquals(total_potential, numpy.sum(potentials * [10.0, 1.0]) / 2.0)


class TestPhigrape(TestWithMPI):
    def new_system_of_sun_and_earth(self):
        stars = datamodel.Stars(2)
        sun = stars[0]
        sun.mass = units.MSun(1.0)
        sun.position = units.m(numpy.array((0.0, 0.0, 0.0)))
        sun.velocity = units.ms(numpy.array((0.0, 0.0, 0.0)))
        sun.radius = units.RSun(1.0)

        earth = stars[1]
        earth.mass = units.kg(5.9736e24)
        earth.radius = units.km(6371)
        earth.position = units.km(numpy.array((149.5e6, 0.0, 0.0)))
        earth.velocity = units.ms(numpy.array((0.0, 29800, 0.0)))

        return stars

    def test1(self):
        convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
        instance = PhiGRAPE(convert_nbody, **default_test_options)  # , debugger="xterm")
        instance.initialize_code()
        instance.parameters.set_defaults()
        instance.parameters.initial_timestep_parameter = 0.001
        instance.parameters.timestep_parameter = 0.001

        stars = self.new_system_of_sun_and_earth()
        earth = stars[1]
        instance.particles.add_particles(stars)
        instance.commit_particles()

        position_at_start = earth.position.value_in(units.AU)[0]
        instance.evolve_model(365 | units.day)
        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_full_rotation = earth.position.value_in(units.AU)[0]
        self.assertAlmostEqual(position_at_start, position_after_full_rotation, 2)

        instance.evolve_model(365.0 + (365.0 / 2) | units.day)
        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
        self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)

        instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
        self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)

        instance.cleanup_code()
        instance.stop()

    def test2(self):
        convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
        instance = PhiGRAPE(convert_nbody, **default_test_options)

        instance.initialize_code()
        instance.parameters.set_defaults()

        stars = self.new_system_of_sun_and_earth()
        earth = stars[1]
        instance.particles.add_particles(stars)
        instance.commit_particles()

        for x in range(1, 365, 30):
            instance.evolve_model(x | units.day)
            instance.particles.copy_values_of_all_attributes_to(stars)
            stars.savepoint()

        if HAS_MATPLOTLIB:
            figure = pyplot.figure()
            plot = figure.add_subplot(1, 1, 1)

            x_points = earth.get_timeline_of_attribute("x")
            y_points = earth.get_timeline_of_attribute("y")

            x_points_in_AU = [t_x[1].value_in(units.AU) for t_x in x_points]
            y_points_in_AU = [t_x1[1].value_in(units.AU) for t_x1 in y_points]

            plot.scatter(x_points_in_AU, y_points_in_AU, color="b", marker='o')

            plot.set_xlim(-1.5, 1.5)
            plot.set_ylim(-1.5, 1.5)

            test_results_path = self.get_path_to_results()
            output_file = os.path.join(test_results_path, "phiGRAPE-earth-sun2.svg")
            figure.savefig(output_file)

        instance.cleanup_code()
        instance.stop()

    def test4(self):
        convert_nbody = nbody_system.nbody_to_si(5.0 | units.kg, 10.0 | units.m)

        instance = PhiGRAPE(convert_nbody, **default_test_options)

        instance.initialize_code()
        instance.parameters.set_defaults()

        particles = datamodel.Particles(2)
        self.assertEqual(len(instance.particles), 0)

        particles.mass = [15.0, 30.0] | units.kg
        particles.radius = [10.0, 20.0] | units.m
        particles.position = [[10.0, 20.0, 30.0], [20.0, 40.0, 60.0]] | units.m
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.m / units.s

        instance.particles.add_particles(particles)
        self.assertEqual(len(instance.particles), 2)

        instance.particles.mass = [17.0, 33.0] | units.kg

        self.assertEqual(instance.get_mass(1), 17.0 | units.kg)
        self.assertEqual(instance.get_mass(2), 33.0 | units.kg)

        instance.stop()

    def test5(self):
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()

        particles = datamodel.Particles(2)
        particles.mass = [1.0, 1.0] | nbody_system.mass
        particles.radius = [0.0001, 0.0001] | nbody_system.length
        particles.position = [[0.0, 0.0, 0.0], [2.0, 0.0, 0.0]] | nbody_system.length
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
        instance.particles.add_particles(particles)

        instance.commit_particles()

        zero = 0.0 | nbody_system.length
        fx, fy, fz = instance.get_gravity_at_point(zero, 1.0 | nbody_system.length, zero, zero)
        self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
        for x in (0.25, 0.5, 0.75):
            x0 = x | nbody_system.length
            x1 = (2.0 - x) | nbody_system.length
            potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
            potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
            fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
            fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)

            self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
            self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
            self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
            self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)

            self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
            fx = (-1.0 / (x0**2) + 1.0 / (x1**2)) * (1.0 | nbody_system.length ** 3 / nbody_system.time ** 2)
            self.assertAlmostEqual(fx, fx0, 2)
            self.assertAlmostEqual(potential0, potential1, 5)

        instance.stop()

    def test6(self):
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()

        particles = datamodel.Particles(6)
        particles.mass = nbody_system.mass.new_quantity(range(1, 7))
        particles.radius = 0.00001 | nbody_system.length
        particles.position = [[-1.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, -1.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, -1.0], [0.0, 0.0, 1.0]] | nbody_system.length
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
        instance.particles.add_particles(particles)
        instance.commit_particles()
        copyof = instance.particles.copy()

        self.assertEqual(2 | nbody_system.mass, copyof[1].mass)

        instance.stop()

    def test7(self):
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()

        particles = datamodel.Particles(2)
        particles.mass = [1.0, 1.0] | nbody_system.mass
        particles.radius = [0.0001, 0.0001] | nbody_system.length
        particles.position = [[0.0, 0.0, 0.0], [2.0, 0.0, 0.0]] | nbody_system.length
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
        instance.particles.add_particles(particles)

        instance.commit_particles()

        zero = [0.0, 0.0, 0.0] | nbody_system.length
        fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
        self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
        self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
        self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
        self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)

        n = 512
        x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
        zero = nbody_system.length.new_quantity(numpy.zeros(n))
        fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
        for i in range(n//2):
            self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)

        instance.stop()

    def test8(self):
        particles = datamodel.Particles(6)
        particles.mass = nbody_system.mass.new_quantity(range(1, 7))
        particles.radius = 0.00001 | nbody_system.length
        particles.position = [[-1.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, -1.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, -1.0], [0.0, 0.0, 1.0]] | nbody_system.length
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed

        for current_mode in ['g6lib', 'gpu', 'grape']:
            try:
                instance = PhiGRAPE(mode=current_mode)
            except:
                print("Running PhiGRAPE with mode=" + current_mode, "was unsuccessful.")
            else:
                print("Running PhiGRAPE with mode=" + current_mode + "...", end=' ')
                instance.initialize_code()
                instance.particles.add_particles(particles)
                instance.commit_particles()
                instance.evolve_model(0.1 | nbody_system.time)
                instance.cleanup_code()
                instance.stop()
                print("ok")

    def test9(self):
        convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
        instance = PhiGRAPE(convert_nbody, **default_test_options)  # , debugger="xterm")
        instance.initialize_code()

        instance.parameters.set_defaults()
        instance.parameters.initialize_gpu_once = 1

        stars = self.new_system_of_sun_and_earth()
        earth = stars[1]

        instance.particles.add_particles(stars)
        instance.commit_particles()

        instance.evolve_model(365 | units.day)

        instance.particles.copy_values_of_all_attributes_to(stars)

        position_at_start = earth.position.value_in(units.AU)[0]
        position_after_full_rotation = earth.position.value_in(units.AU)[0]
        self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)

        instance.evolve_model(365.0 + (365.0 / 2) | units.day)

        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
        self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)

        instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)

        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
        # self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)

        instance.cleanup_code()

        instance.stop()

    def test10(self):
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()

        stars = new_plummer_model(100)
        stars.radius = 0 | nbody_system.length

        instance.particles.add_particles(stars)
        channel = stars.new_channel_to(instance.particles)

        instance.evolve_model(0.001 | nbody_system.time)

        e0 = instance.kinetic_energy + instance.potential_energy

        stars.mass *= 0.9
        channel.copy()

        instance.synchronize_model()

        e1 = instance.kinetic_energy + instance.potential_energy

        delta_e = e1 - e0

        self.assertTrue(e1 != e0)

        instance.stop()

    def test11(self):
        print("Testing PhiGRAPE collision_detection")
        particles = datamodel.Particles(7)
        particles.mass = 0.001 | nbody_system.mass
        particles.radius = 0.01 | nbody_system.length
        particles.x = [-101.0, -100.0, -0.5, 0.5, 100.0, 101.0, 104.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.velocity = [[2, 0, 0], [-2, 0, 0]]*3 + [[-4, 0, 0]] | nbody_system.speed

        instance = PhiGRAPE(redirection='none', **default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()
        instance.particles.add_particles(particles)
        print()
        print(instance.model_time)
        print(instance.particles)
        print()
        collisions = instance.stopping_conditions.collision_detection
        collisions.enable()
        instance.evolve_model(1.0 | nbody_system.time)
        print()
        print(instance.model_time)
        print(instance.particles)
        print()

        self.assertTrue(collisions.is_set())
        self.assertTrue(instance.model_time < 0.5 | nbody_system.time)
        self.assertEqual(len(collisions.particles(0)), 3)
        self.assertEqual(len(collisions.particles(1)), 3)
        self.assertEqual(len(particles - collisions.particles(0) - collisions.particles(1)), 1)
        self.assertEqual(abs(collisions.particles(0).x - collisions.particles(1).x) <
                (collisions.particles(0).radius + collisions.particles(1).radius),
                [True, True, True])

        sticky_merged = datamodel.Particles(len(collisions.particles(0)))
        sticky_merged.mass = collisions.particles(0).mass + collisions.particles(1).mass
        sticky_merged.radius = collisions.particles(0).radius
        for p1, p2, merged in zip(collisions.particles(0), collisions.particles(1), sticky_merged):
            merged.position = (p1 + p2).center_of_mass()
            merged.velocity = (p1 + p2).center_of_mass_velocity()

        instance.particles.remove_particles(collisions.particles(0) + collisions.particles(1))
        instance.particles.add_particles(sticky_merged)
        print()
        print(instance.model_time)
        print(instance.particles)
        print()

        instance.evolve_model(1.0 | nbody_system.time)
        print()
        print(instance.model_time)
        print(instance.particles)
        print()
        self.assertTrue(collisions.is_set())
        self.assertTrue(instance.model_time < 1.0 | nbody_system.time)
        print(f'cp0: {collisions.particles(0)}')
        print(f'cp1: {collisions.particles(1)}')
        self.assertEqual(len(collisions.particles(0)), 1)
        self.assertEqual(len(collisions.particles(1)), 1)
        self.assertEqual(len(instance.particles - collisions.particles(0) - collisions.particles(1)), 2)
        self.assertEqual(abs(collisions.particles(0).x - collisions.particles(1).x) <
                (collisions.particles(0).radius + collisions.particles(1).radius),
                [True])
        instance.stop()

    def test13(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0, 10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx = 0 | nbody_system.speed
        particles.vy = 0 | nbody_system.speed
        particles.vz = 0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass

        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_number_of_steps = 2
        self.assertEqual(instance.parameters.stopping_conditions_number_of_steps, 2)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles)
        instance.stopping_conditions.number_of_steps_detection.enable()
        instance.evolve_model(10 | nbody_system.time)
        self.assertTrue(instance.stopping_conditions.number_of_steps_detection.is_set())
        self.assertTrue(instance.model_time < 10 | nbody_system.time)

        instance.stop()

    def test14(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0, 10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx = 0 | nbody_system.speed
        particles.vy = 0 | nbody_system.speed
        particles.vz = 0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass

        very_short_time_to_evolve = 1 | units.s
        very_long_time_to_evolve = 1e9 | nbody_system.time

        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_timeout = very_short_time_to_evolve
        self.assertEqual(instance.parameters.stopping_conditions_timeout, very_short_time_to_evolve)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles)
        instance.stopping_conditions.timeout_detection.enable()
        start = time.time()
        instance.evolve_model(very_long_time_to_evolve)
        end = time.time()
        self.assertTrue(instance.stopping_conditions.timeout_detection.is_set())
        self.assertTrue((end-start) < very_short_time_to_evolve.value_in(units.s) + 2)  # 2 = some overhead compensation

        instance.stop()

    def test15(self):
        self.skip("MPI is disabled because it seems to be broken, see #1090")
        instance = PhiGRAPE(number_of_workers=2, **default_test_options)  # , redirection = "none")
        instance.initialize_code()
        instance.parameters.set_defaults()
        print(1)
        particles = datamodel.Particles(2)
        particles.x = [-1.0, 1.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx = 0 | nbody_system.speed
        particles.vy = 0 | nbody_system.speed
        particles.vz = 0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass

        instance.particles.add_particles(particles)
        instance.commit_particles()

        instance.evolve_model(0.01 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertEqual(instance.particles[0].position.x, -instance.particles[1].position.x)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482111 | nbody_system.length, 6)

        instance.evolve_model(0.10 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertEqual(instance.particles[0].position.x, -instance.particles[1].position.x)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.99804560161 | nbody_system.length, 6)

        instance.evolve_model(0.50 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertEqual(instance.particles[0].position.x, -instance.particles[1].position.x)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968416814302 | nbody_system.length, 6)

        instance.cleanup_code()

        instance.stop()

    def test16(self):
        self.skip("MPI is disabled because it seems to be broken, see #1090")
        instance = PhiGRAPE(number_of_workers=2, **default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()
        print(1)
        particles = datamodel.Particles(2)
        particles.x = [-1.0, 1.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx = 0 | nbody_system.speed
        particles.vy = 0 | nbody_system.speed
        particles.vz = 0 | nbody_system.speed
        particles.mass = [1.0, 0.5] | nbody_system.mass

        instance.particles.add_particles(particles)
        instance.commit_particles()

        instance.evolve_model(0.01 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999984741095 | nbody_system.length, 8)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x,  0.999969482189 | nbody_system.length, 8)

        instance.evolve_model(0.10 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999022960148 | nbody_system.length, 8)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.998045920305 | nbody_system.length, 8)

        instance.evolve_model(0.50 | nbody_system.time)

        instance.particles.copy_values_of_all_attributes_to(particles)

        print(instance.particles.position.x)
        self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.984250788742 | nbody_system.length, 8)
        self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968501583383 | nbody_system.length, 8)

        instance.cleanup_code()

        instance.stop()

    def test17(self):
        convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
        instance = PhiGRAPE(convert_nbody, **default_test_options)
        instance.initialize_code()

        instance.parameters.set_defaults()
        instance.parameters.initial_timestep_parameter = 0.001
        instance.parameters.timestep_parameter = 0.001
        instance.parameters.epsilon_squared = 0.0 | units.AU**2

        stars = self.new_system_of_sun_and_earth()
        earth = stars[1]

        instance.particles.add_particles(stars)
        instance.commit_particles()

        position_at_start = earth.position.value_in(units.AU)[0]
        print(instance.particles[0].position.as_quantity_in(units.AU))
        print(instance.particles[1].position.as_quantity_in(units.AU))
        instance.evolve_model(365 | units.day)
        print(instance.particles[0].position.as_quantity_in(units.AU))
        print(instance.particles[1].position.as_quantity_in(units.AU))

        instance.particles.copy_values_of_all_attributes_to(stars)

        position_after_full_rotation = earth.position.value_in(units.AU)[0]

        self.assertAlmostEqual(position_at_start, position_after_full_rotation, 3)

        print(instance.particles[0].position.as_quantity_in(units.AU))
        instance.evolve_model(365.0 + (365.0 / 2) | units.day)

        print(instance.particles[0].position.as_quantity_in(units.AU))

        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
        self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)

        instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)

        instance.particles.copy_values_of_all_attributes_to(stars)
        position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
        # self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)

        instance.cleanup_code()

        instance.stop()

    def test18(self):
        print("Testing PhiGRAPE delete_particle")
        number_of_particles = 15
        delete_order = [6, 9, 3, 1, 0, 2, 5]
        number_of_initial_deletes = 3

        particles = datamodel.Particles(number_of_particles)
        particles.mass = range(1, number_of_particles + 1) | nbody_system.mass
        particles.radius = 0.01 | nbody_system.length
        particles.x = range(number_of_particles) | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.vx = range(number_of_particles) | nbody_system.speed
        particles.vy = 0 | nbody_system.speed
        particles.vz = 0 | nbody_system.speed

        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.set_defaults()
        initial_number_of_particles = number_of_particles - len(delete_order) + number_of_initial_deletes
        instance.particles.add_particles(particles[:initial_number_of_particles])
        index_new_particle = initial_number_of_particles

        self.assertEqual(len(instance.particles), initial_number_of_particles)
        instance.evolve_model(0.01 | nbody_system.time)
        instance.particles.remove_particles(particles[delete_order[:number_of_initial_deletes]])
        number_of_deletes = number_of_initial_deletes
        self.assertEqual(len(instance.particles), initial_number_of_particles - number_of_deletes)

        for i, particle_index in enumerate(delete_order[number_of_initial_deletes:]):
            instance.evolve_model((i+1) / 10.0 | nbody_system.time)
            instance.particles.remove_particle(particles[particle_index])
            number_of_deletes += 1
            instance.particles.add_particle(particles[index_new_particle])
            index_new_particle += 1
            self.assertEqual(len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1)
            self.assertAlmostEqual(particles[:index_new_particle].total_mass() - instance.particles.total_mass(),
                (delete_order[:number_of_deletes] | nbody_system.mass).sum() + (number_of_deletes | nbody_system.mass))

        instance.stop()

    def test19(self):
        self.skip("MPI is disabled because it seems to be broken, see #1090")
        converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.parsec)

        particles = datamodel.Particles(2)
        particles.mass = 100 | units.MSun
        particles.radius = 200 | units.RSun
        particles[0].position = [0, 0, 0] | units.parsec
        particles[1].position = [1, 0, 0] | units.parsec
        particles.velocity = [0, 0, 0] | units.km / units.s

        code = PhiGRAPE(
            converter,
            PhiGRAPEInterface.MODE_G6LIB,
            number_of_workers=2
        )
        code.initialize_code()
        stop_cond = code.stopping_conditions.collision_detection
        stop_cond.enable()

        code.particles.add_particles(particles)

        code.evolve_model(0.08 | nbody_system.time)

        self.assertTrue(stop_cond.is_set())
