# Copyright (C) 2023, Princeton University.
# This source code is licensed under the BSD 3-Clause license found in the LICENSE file in the root directory of this source tree.

# Authors: Alexander Raistrick


import numpy as np
from numpy.random import normal, uniform

from infinigen.core import surface
from infinigen.core.nodes.node_wrangler import Nodes
from infinigen.core.util.color import hsv2rgba


def shader_basic_bsdf(nw):
    color = nw.new_node(Nodes.RGB)
    color.outputs[0].default_value = hsv2rgba(uniform(0.05, 0.95, 3))

    principled_bsdf = nw.new_node(
        Nodes.PrincipledBSDF,
        input_kwargs={
            "Base Color": color,
            "Roughness": np.clip(normal(0.6, 0.3), 0.05, 0.95),
            "Metallic": uniform(0, 1) if uniform() < 0.3 else 0,
            "Subsurface": 0 if uniform() < 0.8 else uniform(0, 0.2),
        },
        attrs={"subsurface_method": "BURLEY"},
    )

    material_output = nw.new_node(
        Nodes.MaterialOutput, input_kwargs={"Surface": principled_bsdf}
    )

    return principled_bsdf


def apply(obj, selection=None, **kwargs):
    surface.add_material(obj, shader_basic_bsdf, reuse=False)