import bpy
from bpy.types import NodeSocket

import lnx
import lnx.material.cycles as c
import lnx.material.mat_state as mat_state
import lnx.material.mat_utils as mat_utils
from lnx.material.parser_state import ParserState

if lnx.is_reload(__name__):
    c = lnx.reload_module(c)
    mat_state = lnx.reload_module(mat_state)
    mat_utils = lnx.reload_module(mat_utils)
    lnx.material.parser_state = lnx.reload_module(lnx.material.parser_state)
    from lnx.material.parser_state import ParserState
else:
    lnx.enable_reload(__name__)

# Principled BSDF socket names that differ between Blender versions
if bpy.app.version < (4, 0, 0):
    EMISSION_COLOR = 'Emission'
    SUBSURFACE = 'Subsurface'
    SUBSURFACE_RADIUS = 'Subsurface Radius'
    SUBSURFACE_COLOR = 'Subsurface Color'
    SPECULAR = 'Specular'
    SPECULAR_TINT = 'Specular Tint'
    ANISOTROPIC = 'Anisotropic'
    ANISOTROPIC_ROT = 'Anisotropic Rotation'
    SHEEN = 'Sheen'
    SHEEN_TINT = 'Sheen Tint'
    CLEARCOAT = 'Clearcoat'
    CLEARCOAT_ROUGHNESS = 'Clearcoat Roughness'
    CLEARCOAT_NORMAL = 'Clearcoat Normal'
    TRANSMISSION = 'Transmission'
    TRANSMISSION_ROUGHNESS = 'Transmission Roughness'
    TANGENT = 'Tangent'
else:
    EMISSION_COLOR = 'Emission Color'
    SUBSURFACE = 'Subsurface Weight'
    SUBSURFACE_RADIUS = 'Subsurface Radius'
    SUBSURFACE_COLOR = 'Subsurface Color'
    SPECULAR = 'Specular IOR Level'
    SPECULAR_TINT = 'Specular Tint'
    ANISOTROPIC = 'Anisotropic'
    ANISOTROPIC_ROT = 'Anisotropic Rotation'
    SHEEN = 'Sheen Weight'
    SHEEN_TINT = 'Sheen Tint'
    SHEEN_ROUGHNESS = 'Sheen Roughness'
    CLEARCOAT = 'Coat Weight'
    CLEARCOAT_ROUGHNESS = 'Coat Roughness'
    CLEARCOAT_NORMAL = 'Coat Normal'
    COAT_IOR = 'Coat IOR'
    COAT_TINT = 'Coat Tint'
    TRANSMISSION = 'Transmission Weight'
    TRANSMISSION_ROUGHNESS = 'Transmission Roughness'
    TANGENT = 'Tangent'
    THIN_WALL = 'Thin Wall'
    SUBSURFACE_SCALE = 'Subsurface Scale'
    SUBSURFACE_ANISOTROPY = 'Subsurface Anisotropy'


def parse_mixshader(node: bpy.types.ShaderNodeMixShader, out_socket: NodeSocket, state: ParserState) -> None:
    # Skip mixing if only one input is effectively used
    if not node.inputs['Fac'].is_linked:
        if node.inputs['Fac'].default_value <= 0.0:
            c.parse_shader_input(node.inputs[1])
            return
        elif node.inputs['Fac'].default_value >= 1.0:
            c.parse_shader_input(node.inputs[2])
            return

    prefix = '' if node.inputs['Fac'].is_linked else 'const '
    fac = c.parse_value_input(node.inputs['Fac'])
    fac_var = c.node_name(node.name) + '_fac' + state.get_parser_pass_suffix()
    fac_inv_var = c.node_name(node.name) + '_fac_inv'
    state.curshader.write('{0}float {1} = clamp({2}, 0.0, 1.0);'.format(prefix, fac_var, fac))
    state.curshader.write('{0}float {1} = 1.0 - {2};'.format(prefix, fac_inv_var, fac_var))

    mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
    o1 = c.parse_shader_input(node.inputs[1])
    ek1 = mat_state.emission_type

    mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
    o2 = c.parse_shader_input(node.inputs[2])
    ek2 = mat_state.emission_type

    if state.parse_surface:
        fm = '{0} * {3} + {1} * {2}'  # fac mix template: a*fac_inv + b*fac
        fv = (fac_var, fac_inv_var)
        state.out_basecol = fm.format(o1[0], o2[0], fv[0], fv[1])
        state.out_roughness = fm.format(o1[1], o2[1], fv[0], fv[1])
        state.out_metallic = fm.format(o1[2], o2[2], fv[0], fv[1])
        state.out_occlusion = fm.format(o1[3], o2[3], fv[0], fv[1])
        state.out_specular = fm.format(o1[4], o2[4], fv[0], fv[1])
        state.out_emission_col = fm.format(o1[7], o2[7], fv[0], fv[1])
        state.out_subsurface = fm.format(o1[8], o2[8], fv[0], fv[1])
        state.out_subsurface_radius = fm.format(o1[9], o2[9], fv[0], fv[1])
        state.out_subsurface_color = fm.format(o1[10], o2[10], fv[0], fv[1])
        state.out_specular_tint = fm.format(o1[11], o2[11], fv[0], fv[1])
        state.out_anisotropy = fm.format(o1[12], o2[12], fv[0], fv[1])
        state.out_aniso_rot = fm.format(o1[13], o2[13], fv[0], fv[1])
        state.out_sheen = fm.format(o1[14], o2[14], fv[0], fv[1])
        state.out_sheen_rough = fm.format(o1[15], o2[15], fv[0], fv[1])
        state.out_sheen_tint = fm.format(o1[16], o2[16], fv[0], fv[1])
        state.out_clearcoat = fm.format(o1[17], o2[17], fv[0], fv[1])
        state.out_clearcoat_rough = fm.format(o1[18], o2[18], fv[0], fv[1])
        state.out_transmission = fm.format(o1[19], o2[19], fv[0], fv[1])
        state.out_transmission_rough = fm.format(o1[20], o2[20], fv[0], fv[1])
        state.out_thin_wall = fm.format(o1[21], o2[21], fv[0], fv[1])
        state.out_tangent = fm.format(o1[22], o2[22], fv[0], fv[1])
        state.out_subsurface_scale = fm.format(o1[23], o2[23], fv[0], fv[1])
        state.out_subsurface_anisotropy = fm.format(o1[24], o2[24], fv[0], fv[1])
        state.out_coat_ior = fm.format(o1[25], o2[25], fv[0], fv[1])
        state.out_coat_tint = fm.format(o1[26], o2[26], fv[0], fv[1])
        mat_state.emission_type = mat_state.EmissionType.get_effective_combination(ek1, ek2)
    if state.parse_opacity:
        fm = '{0} * {3} + {1} * {2}'
        fv = (fac_var, fac_inv_var)
        state.out_opacity = fm.format(o1[5], o2[5], fv[0], fv[1])
        state.out_ior = fm.format(o1[6], o2[6], fv[0], fv[1])

def parse_addshader(node: bpy.types.ShaderNodeAddShader, out_socket: NodeSocket, state: ParserState) -> None:
    mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
    o1 = c.parse_shader_input(node.inputs[0])
    ek1 = mat_state.emission_type

    mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
    o2 = c.parse_shader_input(node.inputs[1])
    ek2 = mat_state.emission_type

    if state.parse_surface:
        am = '{0} * 0.5 + {1} * 0.5'  # add mix template (average)
        state.out_basecol = '({0} + {1})'.format(o1[0], o2[0])
        state.out_roughness = am.format(o1[1], o2[1])
        state.out_metallic = am.format(o1[2], o2[2])
        state.out_occlusion = am.format(o1[3], o2[3])
        state.out_specular = am.format(o1[4], o2[4])
        state.out_emission_col = '({0} + {1})'.format(o1[7], o2[7])
        state.out_subsurface = am.format(o1[8], o2[8])
        state.out_subsurface_radius = am.format(o1[9], o2[9])
        state.out_subsurface_color = am.format(o1[10], o2[10])
        state.out_specular_tint = am.format(o1[11], o2[11])
        state.out_anisotropy = am.format(o1[12], o2[12])
        state.out_aniso_rot = am.format(o1[13], o2[13])
        state.out_sheen = am.format(o1[14], o2[14])
        state.out_sheen_rough = am.format(o1[15], o2[15])
        state.out_sheen_tint = am.format(o1[16], o2[16])
        state.out_clearcoat = am.format(o1[17], o2[17])
        state.out_clearcoat_rough = am.format(o1[18], o2[18])
        state.out_transmission = am.format(o1[19], o2[19])
        state.out_transmission_rough = am.format(o1[20], o2[20])
        state.out_thin_wall = am.format(o1[21], o2[21])
        state.out_tangent = am.format(o1[22], o2[22])
        state.out_subsurface_scale = am.format(o1[23], o2[23])
        state.out_subsurface_anisotropy = am.format(o1[24], o2[24])
        state.out_coat_ior = am.format(o1[25], o2[25])
        state.out_coat_tint = am.format(o1[26], o2[26])
        mat_state.emission_type = mat_state.EmissionType.get_effective_combination(ek1, ek2)
    if state.parse_opacity:
        am = '{0} * 0.5 + {1} * 0.5'
        state.out_opacity = am.format(o1[5], o2[5])
        state.out_ior = am.format(o1[6], o2[6])

# TODO: Refactor using c.get_*_input()


if bpy.app.version < (2, 91, 0):
    def parse_bsdfprincipled(node: bpy.types.ShaderNodeBsdfPrincipled, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Base Color'])
            state.out_subsurface = c.parse_value_input(node.inputs[SUBSURFACE])
            state.out_subsurface_radius = c.parse_vector_input(node.inputs[SUBSURFACE_RADIUS])
            state.out_subsurface_color = c.parse_vector_input(node.inputs[SUBSURFACE_COLOR])
            state.out_metallic = c.parse_value_input(node.inputs['Metallic'])
            state.out_specular = c.parse_value_input(node.inputs[SPECULAR])
            state.out_specular_tint = 'vec3({})'.format(c.parse_value_input(node.inputs[SPECULAR_TINT]))
            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
            state.out_anisotropy = c.parse_value_input(node.inputs[ANISOTROPIC])
            state.out_aniso_rot = c.parse_value_input(node.inputs[ANISOTROPIC_ROT])
            state.out_sheen = c.parse_value_input(node.inputs[SHEEN])
            state.out_sheen_tint = 'vec3({})'.format(c.parse_value_input(node.inputs[SHEEN_TINT]))
            state.out_clearcoat = c.parse_value_input(node.inputs[CLEARCOAT])
            state.out_clearcoat_rough = c.parse_value_input(node.inputs[CLEARCOAT_ROUGHNESS])
            coat_normal_socket = node.inputs.get(CLEARCOAT_NORMAL)
            if coat_normal_socket is not None:
                c.write_normal(coat_normal_socket, target_var='nCoat')
            state.out_transmission = c.parse_value_input(node.inputs[TRANSMISSION])
            trans_rough_socket = node.inputs.get(TRANSMISSION_ROUGHNESS)
            if trans_rough_socket is not None:
                state.out_transmission_rough = c.parse_value_input(trans_rough_socket)
            state.out_tangent = c.parse_vector_input(node.inputs[TANGENT])
            if node.inputs[EMISSION_COLOR].is_linked or not mat_utils.equals_color_socket(node.inputs[EMISSION_COLOR], (0.0, 0.0, 0.0), comp_alpha=False):
                emission_col = c.parse_vector_input(node.inputs[EMISSION_COLOR])
                state.out_emission_col = emission_col
                mat_state.emission_type = mat_state.EmissionType.SHADED
            else:
                mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
        if state.parse_opacity:
            state.out_ior = c.parse_value_input(node.inputs['IOR'])
            if 'Alpha' in node.inputs:
                state.out_opacity = c.parse_value_input(node.inputs['Alpha'])
            else:
                state.out_opacity = '1.0'
if bpy.app.version >= (2, 91, 0) and bpy.app.version < (4, 0, 0):
    def parse_bsdfprincipled(node: bpy.types.ShaderNodeBsdfPrincipled, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Base Color'])
            state.out_subsurface = c.parse_value_input(node.inputs[SUBSURFACE])
            state.out_subsurface_radius = c.parse_vector_input(node.inputs[SUBSURFACE_RADIUS])
            state.out_subsurface_color = c.parse_vector_input(node.inputs[SUBSURFACE_COLOR])
            state.out_metallic = c.parse_value_input(node.inputs['Metallic'])
            state.out_specular = c.parse_value_input(node.inputs[SPECULAR])
            state.out_specular_tint = 'vec3({})'.format(c.parse_value_input(node.inputs[SPECULAR_TINT]))
            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
            state.out_anisotropy = c.parse_value_input(node.inputs[ANISOTROPIC])
            state.out_aniso_rot = c.parse_value_input(node.inputs[ANISOTROPIC_ROT])
            state.out_sheen = c.parse_value_input(node.inputs[SHEEN])
            state.out_sheen_tint = 'vec3({})'.format(c.parse_value_input(node.inputs[SHEEN_TINT]))
            state.out_clearcoat = c.parse_value_input(node.inputs[CLEARCOAT])
            state.out_clearcoat_rough = c.parse_value_input(node.inputs[CLEARCOAT_ROUGHNESS])
            coat_normal_socket = node.inputs.get(CLEARCOAT_NORMAL)
            if coat_normal_socket is not None:
                c.write_normal(coat_normal_socket, target_var='nCoat')
            state.out_transmission = c.parse_value_input(node.inputs[TRANSMISSION])
            state.out_transmission_rough = c.parse_value_input(node.inputs[TRANSMISSION_ROUGHNESS])
            state.out_tangent = c.parse_vector_input(node.inputs[TANGENT])
            if (node.inputs['Emission Strength'].is_linked or node.inputs['Emission Strength'].default_value != 0.0)\
                    and (node.inputs[EMISSION_COLOR].is_linked or not mat_utils.equals_color_socket(node.inputs[EMISSION_COLOR], (0.0, 0.0, 0.0), comp_alpha=False)):
                emission_col = c.parse_vector_input(node.inputs[EMISSION_COLOR])
                emission_strength = c.parse_value_input(node.inputs['Emission Strength'])
                state.out_emission_col = '({0} * {1})'.format(emission_col, emission_strength)
                mat_state.emission_type = mat_state.EmissionType.SHADED
            else:
                mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
        if state.parse_opacity:
            state.out_ior = c.parse_value_input(node.inputs['IOR'])
            if 'Alpha' in node.inputs:
                state.out_opacity = c.parse_value_input(node.inputs['Alpha'])
            else:
                state.out_opacity = '1.0'
if bpy.app.version >= (4, 0, 0):
    def parse_bsdfprincipled(node: bpy.types.ShaderNodeBsdfPrincipled, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Base Color'])

            sss_input = node.inputs.get(SUBSURFACE)
            if sss_input is not None:
                state.out_subsurface = c.parse_value_input(sss_input)

            sss_radius_input = node.inputs.get(SUBSURFACE_RADIUS)
            if sss_radius_input is not None:
                state.out_subsurface_radius = c.parse_vector_input(sss_radius_input)

            sss_scale_input = node.inputs.get(SUBSURFACE_SCALE)
            if sss_scale_input is not None:
                state.out_subsurface_scale = c.parse_value_input(sss_scale_input)

            sss_aniso_input = node.inputs.get(SUBSURFACE_ANISOTROPY)
            if sss_aniso_input is not None:
                state.out_subsurface_anisotropy = c.parse_value_input(sss_aniso_input)

            sss_color_input = node.inputs.get(SUBSURFACE_COLOR)
            if sss_color_input is not None:
                state.out_subsurface_color = c.parse_vector_input(sss_color_input)
            else:
                state.out_subsurface_color = c.parse_vector_input(node.inputs['Base Color'])

            state.out_metallic = c.parse_value_input(node.inputs['Metallic'])

            specular_socket = node.inputs.get(SPECULAR)
            if specular_socket is not None:
                state.out_specular = f'({c.parse_value_input(specular_socket)} * 2.0)'
            else:
                specular_socket = node.inputs.get('Specular')
                if specular_socket is not None:
                    state.out_specular = c.parse_value_input(specular_socket)
                else:
                    state.out_specular = '1.0'

            spec_tint_socket = node.inputs.get(SPECULAR_TINT)
            if spec_tint_socket is not None:
                state.out_specular_tint = c.parse_vector_input(spec_tint_socket)

            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
            # Prevent black material when metal = 1.0 and roughness = 0.0
            try:
                if float(state.out_roughness) < 0.00101:
                    state.out_roughness = '0.001'
            except ValueError:
                pass

            aniso_socket = node.inputs.get(ANISOTROPIC)
            if aniso_socket is not None:
                state.out_anisotropy = c.parse_value_input(aniso_socket)
            aniso_rot_socket = node.inputs.get(ANISOTROPIC_ROT)
            if aniso_rot_socket is not None:
                state.out_aniso_rot = c.parse_value_input(aniso_rot_socket)

            sheen_socket = node.inputs.get(SHEEN)
            if sheen_socket is not None:
                state.out_sheen = c.parse_value_input(sheen_socket)
            sheen_rough_socket = node.inputs.get(SHEEN_ROUGHNESS)
            if sheen_rough_socket is not None:
                state.out_sheen_rough = c.parse_value_input(sheen_rough_socket)
            sheen_tint_socket = node.inputs.get(SHEEN_TINT)
            if sheen_tint_socket is not None:
                state.out_sheen_tint = c.parse_vector_input(sheen_tint_socket)

            coat_socket = node.inputs.get(CLEARCOAT)
            if coat_socket is not None:
                state.out_clearcoat = c.parse_value_input(coat_socket)
            coat_rough_socket = node.inputs.get(CLEARCOAT_ROUGHNESS)
            if coat_rough_socket is not None:
                state.out_clearcoat_rough = c.parse_value_input(coat_rough_socket)
            coat_ior_socket = node.inputs.get(COAT_IOR)
            if coat_ior_socket is not None:
                state.out_coat_ior = c.parse_value_input(coat_ior_socket)
            coat_tint_socket = node.inputs.get(COAT_TINT)
            if coat_tint_socket is not None:
                state.out_coat_tint = c.parse_vector_input(coat_tint_socket)
            coat_normal_socket = node.inputs.get(CLEARCOAT_NORMAL)
            if coat_normal_socket is not None:
                c.write_normal(coat_normal_socket, target_var='nCoat')

            trans_socket = node.inputs.get(TRANSMISSION)
            if trans_socket is not None:
                state.out_transmission = c.parse_value_input(trans_socket)
            trans_rough_socket = node.inputs.get(TRANSMISSION_ROUGHNESS)
            if trans_rough_socket is not None:
                state.out_transmission_rough = c.parse_value_input(trans_rough_socket)

            thin_wall_socket = node.inputs.get(THIN_WALL)
            if thin_wall_socket is not None:
                state.out_thin_wall = c.parse_value_input(thin_wall_socket)

            tangent_socket = node.inputs.get(TANGENT)
            if tangent_socket is not None:
                state.out_tangent = c.parse_vector_input(tangent_socket)

            if (node.inputs['Emission Strength'].is_linked or node.inputs['Emission Strength'].default_value != 0.0)\
                    and (node.inputs[EMISSION_COLOR].is_linked or not mat_utils.equals_color_socket(node.inputs[EMISSION_COLOR], (0.0, 0.0, 0.0), comp_alpha=False)):
                emission_col = c.parse_vector_input(node.inputs[EMISSION_COLOR])
                emission_strength = c.parse_value_input(node.inputs['Emission Strength'])
                state.out_emission_col = '({0} * {1})'.format(emission_col, emission_strength)
                mat_state.emission_type = mat_state.EmissionType.SHADED
            else:
                mat_state.emission_type = mat_state.EmissionType.NO_EMISSION
        if state.parse_opacity:
            state.out_ior = c.parse_value_input(node.inputs['IOR'])
            state.out_opacity = c.parse_value_input(node.inputs['Alpha'])

def parse_bsdfdiffuse(node: bpy.types.ShaderNodeBsdfDiffuse, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        c.write_normal(node.inputs['Normal'])
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
        state.out_specular = '0.0'

if bpy.app.version >= (4, 0, 0):
    def parse_bsdfsheen(node: bpy.types.ShaderNodeBsdfSheen, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Color'])
            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])

if bpy.app.version < (4, 0, 0):
    def parse_bsdfglossy(node: bpy.types.ShaderNodeBsdfGlossy, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Color'])
            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
            state.out_metallic = '1.0'
else:
    def parse_bsdfglossy(node: bpy.types.ShaderNodeBsdfAnisotropic, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Color'])
            state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
            state.out_metallic = '1.0'
            

def parse_ambientocclusion(node: bpy.types.ShaderNodeAmbientOcclusion, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        # Single channel
        state.out_occlusion = c.parse_vector_input(node.inputs['Distance']) + '.r'


def parse_bsdfanisotropic(node: bpy.types.ShaderNodeBsdfAnisotropic, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        c.write_normal(node.inputs['Normal'])
        # Revert to glossy
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
        state.out_metallic = '1.0'


def parse_emission(node: bpy.types.ShaderNodeEmission, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        emission_col = c.parse_vector_input(node.inputs['Color'])
        emission_strength = c.parse_value_input(node.inputs['Strength'])
        state.out_emission_col = '({0} * {1})'.format(emission_col, emission_strength)
        state.out_basecol = 'vec3(0.0)'
        state.out_specular = '0.0'
        state.out_metallic = '0.0'
        mat_state.emission_type = mat_state.EmissionType.SHADELESS


def parse_bsdfglass(node: bpy.types.ShaderNodeBsdfGlass, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        c.write_normal(node.inputs['Normal'])
        state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
    if state.parse_opacity:
        state.out_opacity = '1.0'
        state.out_ior = c.parse_value_input(node.inputs['IOR'])


def parse_bsdfhair(node: bpy.types.ShaderNodeBsdfHair, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        state.out_roughness = c.parse_value_input(node.inputs['RoughnessU'])
        state.out_specular = '0.0'
        rough_v_socket = node.inputs.get('RoughnessV')
        if rough_v_socket is not None:
            state.out_aniso_rot = c.parse_value_input(rough_v_socket)
        tangent_socket = node.inputs.get('Tangent')
        if tangent_socket is not None:
            state.out_tangent = c.parse_vector_input(tangent_socket)


if bpy.app.version >= (2, 83, 0):
    def parse_bsdfhairprincipled(node: 'bpy.types.ShaderNodeBsdfHairPrincipled', out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            parametrization = getattr(node, 'parametrization', 'COLOR')
            if parametrization == 'COLOR':
                color_socket = node.inputs.get('Color')
                if color_socket is not None:
                    state.out_basecol = c.parse_vector_input(color_socket)
            elif parametrization == 'MELANIN':
                melanin_socket = node.inputs.get('Melanin')
                if melanin_socket is not None:
                    state.out_subsurface = c.parse_value_input(melanin_socket)
                melanin_red_socket = node.inputs.get('Melanin Redness')
                if melanin_red_socket is not None:
                    state.out_specular_tint = 'vec3({})'.format(c.parse_value_input(melanin_red_socket))
            elif parametrization == 'ABSORPTION':
                absorption_socket = node.inputs.get('Absorption Coefficient')
                if absorption_socket is not None:
                    state.out_specular_tint = c.parse_vector_input(absorption_socket)
            tint_socket = node.inputs.get('Tint')
            if tint_socket is not None:
                state.out_subsurface_color = c.parse_vector_input(tint_socket)
            rough_socket = node.inputs.get('Roughness')
            if rough_socket is not None:
                state.out_roughness = c.parse_value_input(rough_socket)
            model = getattr(node, 'model', 'CHIANG')
            if model == 'CHIANG':
                radial_rough_socket = node.inputs.get('Radial Roughness')
                if radial_rough_socket is not None:
                    state.out_aniso_rot = c.parse_value_input(radial_rough_socket)
            coat_socket = node.inputs.get('Coat')
            if coat_socket is not None:
                state.out_clearcoat = c.parse_value_input(coat_socket)
            random_color_socket = node.inputs.get('Random Color')
            if random_color_socket is not None:
                state.out_sheen = c.parse_value_input(random_color_socket)
            random_rough_socket = node.inputs.get('Random Roughness')
            if random_rough_socket is not None:
                state.out_sheen_rough = c.parse_value_input(random_rough_socket)
            offset_socket = node.inputs.get('Offset')
            if offset_socket is not None:
                state.out_anisotropy = c.parse_value_input(offset_socket)
            state.out_specular = '0.0'
            state.out_metallic = '0.0'
        if state.parse_opacity:
            ior_socket = node.inputs.get('IOR')
            if ior_socket is not None:
                state.out_ior = c.parse_value_input(ior_socket)
            state.out_opacity = '1.0'


def parse_holdout(node: bpy.types.ShaderNodeHoldout, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        # Occlude
        state.out_occlusion = '0.0'


def parse_bsdfrefraction(node: bpy.types.ShaderNodeBsdfRefraction, out_socket: NodeSocket, state: ParserState) -> None: 
    if state.parse_surface:
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        c.write_normal(node.inputs['Normal'])
        state.out_roughness = c.parse_value_input(node.inputs['Roughness'])
    if state.parse_opacity:
        state.out_opacity = '1.0'
        state.out_ior = c.parse_value_input(node.inputs['IOR'])

def parse_subsurfacescattering(node: bpy.types.ShaderNodeSubsurfaceScattering, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        c.write_normal(node.inputs['Normal'])
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        state.out_subsurface = c.parse_value_input(node.inputs['Scale'])
        state.out_subsurface_radius = c.parse_vector_input(node.inputs['Radius'])
        state.out_subsurface_color = c.parse_vector_input(node.inputs['Color'])
        state.out_specular = '0.0'


def parse_bsdftoon(node: bpy.types.ShaderNodeBsdfToon, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        c.write_normal(node.inputs['Normal'])
        state.out_basecol = c.parse_vector_input(node.inputs['Color'])
        state.out_roughness = c.parse_value_input(node.inputs['Size'])
        state.out_specular = '0.0'


def parse_bsdftranslucent(node: bpy.types.ShaderNodeBsdfTranslucent, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_surface:
        c.write_normal(node.inputs['Normal'])
    if state.parse_opacity:
        state.out_opacity = '(1.0 - {0}.r)'.format(c.parse_vector_input(node.inputs['Color']))
        state.out_ior = '1.0'


def parse_bsdftransparent(node: bpy.types.ShaderNodeBsdfTransparent, out_socket: NodeSocket, state: ParserState) -> None:
    if state.parse_opacity:
        state.out_opacity = '(1.0 - {0}.r)'.format(c.parse_vector_input(node.inputs['Color']))
        state.out_ior = '1.0'

if bpy.app.version < (4, 0, 0):
    def parse_bsdfvelvet(node: bpy.types.ShaderNodeBsdfVelvet, out_socket: NodeSocket, state: ParserState) -> None:
        if state.parse_surface:
            c.write_normal(node.inputs['Normal'])
            state.out_basecol = c.parse_vector_input(node.inputs['Color'])
            state.out_roughness = '1.0'
            state.out_metallic = '1.0'