# Test of Wall constructor
# Copyright (C) 2019  Robin, Scheibler, Cyril Cadoux
#
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# SOFTWARE.
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from __future__ import division

import numpy as np

import pyroomacoustics as pra

eps = 1e-6

# The vertices of the wall are assumed to turn counter-clockwise around the
# normal of the wall

# A very simple wall
walls = [
    {
        "corners": np.array(
            [
                [0.0, 1.0, 1.0, 0.0],
                [0.0, 0.0, 1.0, 1.0],
                [0.0, 0.0, 0.0, 0.0],
            ]
        ),
        "area": 1,
        "absorption": [0.2],
        "scattering": [0.1],
    },
    {
        "corners": np.array(
            [
                [-1, 1, 1],
                [1, -1, 1],
                [1, 1, -1],
            ]
        ),
        "area": 3.4641016151377557,  # this is an equilateral triangle with side sqrt(8)
        "absorption": [0.2],
        "scattering": [0.1],
    },
]


def test_wall_3d_construct_0():
    """Tests construction of a wall"""
    w_info = walls[0]
    wall = pra.wall_factory(w_info["corners"], [0.2], [0.1])


def test_wall_3d_construct_1():
    """Tests construction of a wall"""
    w_info = walls[1]
    wall = pra.wall_factory(w_info["corners"], [0.2], [0.1])


def test_wall_3d_area_0():
    """Tests the area computation"""
    w_info = walls[0]
    wall = pra.wall_factory(
        w_info["corners"], w_info["absorption"], w_info["scattering"]
    )
    err = abs(wall.area() - w_info["area"])
    assert err < 1, "The error is {}".format(err)


def test_wall_3d_area_1():
    """Tests the area computation"""
    w_info = walls[1]
    wall = pra.wall_factory(
        w_info["corners"], w_info["absorption"], w_info["scattering"]
    )
    err = abs(wall.area() - w_info["area"])
    assert err < 1, "The error is {}".format(err)


def test_wall_3d_normal_0():
    """Tests direction of normal wrt to point arrangement"""
    w_info = walls[0]
    wall1 = pra.wall_factory(w_info["corners"], [0.2], [0.1])
    # the same wall with normal pointing the other way
    wall2 = pra.wall_factory(w_info["corners"][:, ::-1], [0.2], [0.1])

    err = np.linalg.norm(wall1.normal + wall2.normal)
    assert err < eps, "The error is {}".format(err)


def test_wall_3d_normal_1():
    """Tests direction of normal wrt to point arrangement"""
    w_info = walls[1]
    wall1 = pra.wall_factory(w_info["corners"], [0.2], [0.1])
    # the same wall with normal pointing the other way
    wall2 = pra.wall_factory(w_info["corners"][:, ::-1], [0.2], [0.1])

    err = np.linalg.norm(wall1.normal + wall2.normal)
    assert err < eps, "The error is {}".format(err)


if __name__ == "__main__":
    test_wall_3d_construct_0()
    test_wall_3d_normal_0()
    test_wall_3d_area_0()
    test_wall_3d_construct_1()
    test_wall_3d_normal_1()
    test_wall_3d_area_1()
