# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

from itertools import cycle
from mathutils import Vector
from mathutils.geometry import tessellate_polygon as tessellate
from mathutils.noise import random, seed_set
from numpy import float64 as np_float64, linspace as np_linspace
import bpy
from bpy.props import FloatProperty, IntProperty, EnumProperty, BoolProperty, FloatVectorProperty, IntVectorProperty

import gpu
from gpu_extras.batch import batch_for_shader

from sverchok.utils.modules.drawing_abstractions import drawing 
from sverchok.utils.modules.shader_utils import get_2d_smooth_color_shader, get_2d_uniform_color_shader
from sverchok.data_structure import updateNode, node_id
from sverchok.node_tree import SverchCustomTreeNode
from sverchok.ui import bgl_callback_nodeview as nvBGL
from sverchok.utils.sv_mesh_utils import polygons_to_edges_np
from sverchok.settings import get_params


socket_dict = {
    'vector_color': ('vector_toggle', 'UV_VERTEXSEL', 'color_per_point', 'vector_random_colors', 'random_seed'),
    'edge_color': ('edge_toggle', 'UV_EDGESEL', 'color_per_edge', 'edges_use_vertex_color'),
    'polygon_color': ('polygon_toggle', 'UV_FACESEL', 'color_per_polygon', 'polygon_use_vertex_color'),
    }

def ensure_triangles(coords, indices, handle_concave_quads):
    """
    this fully tesselates the incoming topology into tris,
    not optimized for meshes that don't contain ngons
    """
    new_indices = []
    face_index = []
    concat = new_indices.append
    concat2 = new_indices.extend
    for idf, idxset in enumerate(indices):
        num_verts = len(idxset)
        if num_verts == 3:
            concat(tuple(idxset))
            face_index.append(idf)
        elif num_verts == 4 and not handle_concave_quads:
            # a b c d  ->  [a, b, c], [a, c, d]
            concat2([(idxset[0], idxset[1], idxset[2]), (idxset[0], idxset[2], idxset[3])])
            face_index.extend([idf, idf])
        else:
            subcoords = [Vector(coords[idx]) for idx in idxset]
            for pol in tessellate([subcoords]):
                concat([idxset[i] for i in pol])
                face_index.append(idf)
    return new_indices, face_index

def background_rect(x, y, w, h, margin):
    background_coords = [
        (x, y + margin),
        (x + w + 2* margin, y + margin),
        (w + x + 2 * margin, y - h - margin),
        (x, y - h - margin)]
    background_indices = [(0, 1, 2), (0, 2, 3)]

    return background_coords, background_indices

def fill_points_colors(vectors_color, data, color_per_point, random_colors):
    points_color = []
    if color_per_point:
        for cols, sub_data in zip(cycle(vectors_color), data):
            if random_colors:
                for  n in sub_data:
                    points_color.append([random(), random(), random(), 1])
            else:
                for c, n in zip(cycle(cols), sub_data):
                    points_color.append(c)
    else:
        for nums, col in zip(data, cycle(vectors_color[0])):
            if random_colors:
                r_color = [random(), random(), random(), 1]
                for n in nums:
                    points_color.append(r_color)
            else:
                for n in nums:
                    points_color.append(col)

    return points_color

def get_drawing_location(node):
    x, y = node.get_offset()
    return x * node.location_theta, y * node.location_theta

def view_2d_geom(x, y, args):
    """
    x and y are passed by default so you could add font content
    draws the batches
    """

    geom, config = args
    matrix = gpu.matrix.get_projection_matrix()
    if config.draw_background:
        background_color = config.background_color
        # draw background, this could be cached......

        shader = get_2d_uniform_color_shader()
        batch = batch_for_shader(shader, 'TRIS', {"pos": geom.background_coords}, indices=geom.background_indices)
        shader.bind()
        shader.uniform_float("color", background_color)
        shader.uniform_float("x_offset", x)
        shader.uniform_float("y_offset", y)
        shader.uniform_float("viewProjectionMatrix", matrix)
        batch.draw(shader)

    if config.draw_polys and config.mode == 'Mesh':
        config.p_batch = batch_for_shader(config.p_shader, 'TRIS', {"pos": geom.p_vertices, "color": geom.p_vertex_colors}, indices=geom.p_indices)
        config.p_shader.bind()
        config.p_shader.uniform_float("x_offset", x)
        config.p_shader.uniform_float("y_offset", y)
        config.p_shader.uniform_float("viewProjectionMatrix", matrix)
        config.p_batch.draw(config.p_shader)

    if config.draw_edges:
        drawing.set_line_width(config.edge_width)
        config.e_batch = batch_for_shader(config.e_shader, 'LINES', {"pos": geom.e_vertices, "color": geom.e_vertex_colors}, indices=geom.e_indices)
        config.e_shader.bind()
        config.e_shader.uniform_float("x_offset", x)
        config.e_shader.uniform_float("y_offset", y)
        config.e_shader.uniform_float("viewProjectionMatrix", matrix)
        config.e_batch.draw(config.e_shader)
        drawing.reset_line_width()

    if config.draw_verts:
        drawing.set_point_size(config.point_size)
        config.v_batch = batch_for_shader(config.v_shader, 'POINTS', {"pos": geom.v_vertices, "color": geom.points_color})
        config.v_shader.bind()
        config.v_shader.uniform_float("x_offset", x)
        config.v_shader.uniform_float("y_offset", y)
        config.v_shader.uniform_float("viewProjectionMatrix", matrix)
        config.v_batch.draw(config.v_shader)
        drawing.reset_point_size()


def path_from_nums(nums, x, y, num_width, num_height, maxmin, sys_scale):
    v_path = []
    for i, n in enumerate(nums):
        _px = x + (i * num_width) * sys_scale
        _py = y + ((n - maxmin[1])* num_height) * sys_scale
        v_path.append([_px, _py])
    return v_path

def get_num_width(width, num_list):
    try:
        num_width = width/(len(num_list)-1)
    except ZeroDivisionError:
        num_width = 1
    return num_width

def generate_number_geom(config, numbers):
    geom = lambda: None
    x, y = config.loc
    sys_scale = config.sys_scale
    line_color = config.edge_color
    w, h = config.size
    all_numbers = [n for l in numbers for n in l]
    maxmin = [max(all_numbers), min(all_numbers)]
    margin = 10 * sys_scale
    geom.background_coords, geom.background_indices = background_rect(x, y, w, h, margin)
    v_vertices = []
    e_vertices = []
    vertex_colors = []
    indices = []
    try:
        num_height = h/(max(all_numbers)- min(all_numbers))
    except ZeroDivisionError:
        num_height = 1
    idx_offset = 0

    _x = x + margin
    _y = y - h
    if config.color_per_edge and not config.edges_use_vertex_color:
        for nums, cols in zip(numbers, cycle(line_color)):
            # num_width = w/(len(nums)-1)
            num_width = get_num_width(w, nums)
            v_path = path_from_nums(nums, _x, _y, num_width, num_height, maxmin, sys_scale)
            v_vertices.extend(v_path)

            for v, v1, col in zip(v_path[:-1], v_path[1:], cycle(cols)):
                e_vertices.extend([v, v1])
                vertex_colors.extend([col, col])

            for i in range(len(nums)-1):
                indices.append([2*i + idx_offset, 2*i + 1 + idx_offset])
            idx_offset += 2*len(nums)
    else:
        for nums, col in zip(numbers, cycle(line_color[0])):
            num_width = get_num_width(w, nums)
            v_path = path_from_nums(nums, _x, _y, num_width, num_height, maxmin, sys_scale)
            e_vertices.extend(v_path)
            vertex_colors.extend([col for v in v_path])

            for i in range(len(nums)-1):
                indices.append([i + idx_offset, i + 1 + idx_offset])
            idx_offset += len(nums)

        v_vertices = e_vertices


    points_color = fill_points_colors(config.vector_color, numbers, config.color_per_point, config.random_colors)


    if config.draw_verts:
        config.v_shader = get_2d_smooth_color_shader()
        geom.v_vertices, geom.points_color = v_vertices, points_color

    if config.draw_edges:
        if config.edges_use_vertex_color:
            vertex_colors = points_color

        config.e_shader = get_2d_smooth_color_shader()
        geom.e_vertices, geom.e_vertex_colors, geom.e_indices = e_vertices, vertex_colors, indices


    return geom


def graph_edges(config, v_path, col, e_vertices, e_vertex_colors, e_indices, cyclic, idx_offset):

    offset = idx_offset[0]
    if config.color_per_edge and not config.edges_use_vertex_color:

        for v, v1, c in zip(v_path[:-1], v_path[1:], cycle(col)):
            e_vertices.extend([v, v1])
            e_vertex_colors.extend([c, c])

        for i in range(len(v_path)-1):
            e_indices.append([2*i + offset, 2*i + 1 + offset])
        if cyclic:

            e_indices.append([2 * len(v_path) - 2-1 + offset, 0 + offset])
        idx_offset[0] += 2 * len(v_path) - 2
    else:
        e_vertex_colors.extend([col for v in v_path])
        e_vertices.extend(v_path)

        for i in range(len(v_path)-1):
            e_indices.append([i + offset, i + 1 + offset])
        if cyclic:
            e_indices.append([len(v_path)-1 + offset, 0 + offset])
        idx_offset[0] += len(v_path)


def generate_graph_geom(config, paths):

    geom = lambda: None
    x, y = config.loc
    scale = config.scale
    cyclic = config.cyclic
    sys_scale = config.sys_scale
    if config.color_per_edge:
        edge_color = config.edge_color
    else:
        edge_color = config.edge_color[0]

    all_vecs = [v for vecs in paths for v in vecs]
    maxmin = list(zip(map(max, *all_vecs), map(min, *all_vecs)))
    axis1, axis2 = get_axis_index(config.plane)
    # background geom
    w = (maxmin[axis1][0]- maxmin[axis1][1]) * scale
    h = (maxmin[axis2][0]- maxmin[axis2][1]) * scale
    margin = 10 * sys_scale
    geom.background_coords, geom.background_indices = background_rect(x, y, w, h, margin)
    v_vertices = []
    e_vertices, e_vertex_colors, e_indices = [], [], []
    _x = x + margin

    idx_offset = [0]
    for vecs, col in zip(paths, cycle(edge_color)):
        v_path = transformed_verts(vecs, _x, y, maxmin, scale, axis1, axis2)
        v_vertices.extend(v_path)
        if config.draw_edges:
            graph_edges(config, v_path, col, e_vertices, e_vertex_colors, e_indices, cyclic, idx_offset)


    points_color = fill_points_colors(config.vector_color, paths, config.color_per_point, config.random_colors)

    if config.draw_verts:
        config.v_shader = get_2d_smooth_color_shader()
        geom.v_vertices, geom.points_color = v_vertices, points_color

    if config.draw_edges:
        if config.edges_use_vertex_color:
            e_vertex_colors = points_color

        config.e_shader = get_2d_smooth_color_shader()
        geom.e_vertices, geom.e_vertex_colors, geom.e_indices = e_vertices, e_vertex_colors, e_indices

    return geom


def transformed_verts(vecs, x, y, maxmin, scale, axis1, axis2):
    v_path = []
    for v in vecs:
        _px = x + (v[axis1] - maxmin[axis1][1]) * scale
        _py = y + (v[axis2] - maxmin[axis2][0]) * scale
        v_path.append([_px, _py])
    return v_path


def splitted_polygons_geom(polygon_indices, original_idx, v_path, cols, idx_offset):
    total_p_verts = 0
    p_vertices, vertex_colors, indices = [], [], []
    for pol, idx in zip(polygon_indices, original_idx):
        p_vertices.extend([v_path[c] for c in pol])
        vertex_colors.extend([cols[idx % len(cols)] for c in pol])
        indices.append([c + idx_offset + total_p_verts for c in range(len(pol))])
        total_p_verts += len(pol)
    return p_vertices, vertex_colors, indices, total_p_verts


def get_axis_index(plane):
    if plane == 'XY':
        axis1 = 0
        axis2 = 1
    elif plane == 'XZ':
        axis1 = 0
        axis2 = 2
    elif plane == 'YZ':
        axis1 = 1
        axis2 = 2
    return axis1, axis2


def polygons_geom(config, vecs, polygons, p_vertices, p_vertex_colors, p_indices, v_path, p_cols, idx_p_offset):
    '''generates polygons geometry'''
    if config.color_per_polygon and not config.polygon_use_vertex_color:
        polygon_indices, original_idx = ensure_triangles(vecs, polygons, True)
        p_v, v_c, idx, total_p_verts = splitted_polygons_geom(polygon_indices, original_idx, v_path, p_cols, idx_p_offset[0])
        p_vertices.extend(p_v)
        p_vertex_colors.extend(v_c)
        p_indices.extend(idx)
    else:
        polygon_indices, original_idx = ensure_triangles(vecs, polygons, True)
        p_vertices.extend(v_path)
        p_vertex_colors.extend([p_cols for v in v_path])
        p_indices.extend([[c + idx_p_offset[0] for c in p] for p in polygon_indices])
        total_p_verts = len(vecs)
    idx_p_offset[0] += total_p_verts


def edges_geom(config, edges, e_col, v_path, e_vertices, e_vertex_colors, e_indices, idx_e_offset):
    '''generates edges geometry'''
    if config.color_per_edge and not config.edges_use_vertex_color:
        for (v, v1), col in zip(edges, cycle(e_col)):
            e_vertices.extend([v_path[v], v_path[v1]])
            e_vertex_colors.extend([col, col])
            e_indices.append([len(e_vertices)-2, len(e_vertices)-1])

    else:
        e_vertices.extend(v_path)
        e_vertex_colors.extend([e_col for v in v_path])
        e_indices.extend([[c + idx_e_offset[0] for c in e] for e in edges ])
        idx_e_offset[0] += len(v_path)


def generate_mesh_geom(config, vecs_in):
    '''generates drawing from mesh data'''
    geom = lambda: None
    x, y = config.loc
    scale = config.scale
    sys_scale = config.sys_scale
    if config.color_per_polygon:
        pol_color = config.poly_color
    else:
        pol_color = config.poly_color[0]

    if config.color_per_edge:
        edge_color = config.edge_color
    else:
        edge_color = config.edge_color[0]
    edges_s = config.edges
    polygons_s = config.polygons

    axis1, axis2 = get_axis_index(config.plane)
    all_vecs = [v for vecs in vecs_in for v in vecs ]
    maxmin = list(zip(map(max, *all_vecs), map(min, *all_vecs)))
    # background geom

    w = (maxmin[axis1][0]- maxmin[axis1][1]) * scale
    h = (maxmin[axis2][0]- maxmin[axis2][1]) * scale
    margin = 10 * sys_scale
    geom.background_coords, geom.background_indices = background_rect(x, y, w, h, margin)

    v_vertices = []
    e_vertices, e_vertex_colors, e_indices = [], [], []
    p_vertices, p_vertex_colors, p_indices = [], [], []

    _x = x + margin
    idx_p_offset = [0]
    idx_e_offset = [0]

    for vecs, polygons, edges, p_cols, e_col in zip(vecs_in, cycle(polygons_s), cycle(edges_s), cycle(pol_color), cycle(edge_color)):
        v_path = transformed_verts(vecs, _x, y, maxmin, scale, axis1, axis2)
        v_vertices.extend(v_path)
        if config.draw_edges:
            edges_geom(config, edges, e_col, v_path, e_vertices, e_vertex_colors, e_indices, idx_e_offset)
        if config.draw_polys:
            polygons_geom(config, vecs, polygons, p_vertices, p_vertex_colors, p_indices, v_path, p_cols, idx_p_offset)

    points_color = fill_points_colors(config.vector_color, vecs_in, config.color_per_point, config.random_colors)

    if config.draw_verts:

        config.v_shader = get_2d_smooth_color_shader()
        geom.v_vertices, geom.points_color = v_vertices, points_color

    if config.draw_edges:
        if config.edges_use_vertex_color and e_vertices:
            e_vertex_colors = points_color

        config.e_shader = get_2d_smooth_color_shader()
        geom.e_vertices, geom.e_vertex_colors, geom.e_indices = e_vertices, e_vertex_colors, e_indices


    if config.draw_polys:
        if config.polygon_use_vertex_color:
            p_vertex_colors = points_color
        config.p_shader = get_2d_smooth_color_shader()
        geom.p_vertices, geom.p_vertex_colors, geom.p_indices = p_vertices, p_vertex_colors, p_indices

    return geom


class SvViewer2D(SverchCustomTreeNode, bpy.types.Node):
    '''Display data in the 2d view.
    In: Verts/Curve, Color Vertices/Edges
    Params: Mode (Number/Path,Curve/Mesh), Background Color, Viewer Image Size (X/Y), Vert Size, Edge Width
    '''
    bl_idname = 'SvViewer2D'
    bl_label = 'Viewer 2D'
    bl_icon = 'HIDE_OFF'
    sv_icon = 'SV_EASING'

    modes = [
        ('Number', 'Number', 'Visualize number list', '', 1),
        ('Path', 'Path', 'Visualize vertices sequence', '', 2),
        ('Curve', 'Curve', 'Visualize curve', '', 3),
        ('Mesh', 'Mesh', 'Visualize mesh data', '', 4),

    ]
    plane = [
        ('XY', 'XY', 'Project on XY plane', '', 1),
        ('XZ', 'XZ', 'Project on XZ plane', '', 2),
        ('YZ', 'YZ', 'Project on YZ plane', '', 3),


    ]

    def update_mode(self, context):
        self.update_sockets()
        updateNode(self, context)

    def update_sockets(self):
        self.inputs['Polygon Color'].hide_safe = self.mode != 'Mesh'
        self.inputs['Number'].hide_safe = not self.mode == 'Number'
        self.inputs['Curve'].hide_safe = not self.mode == 'Curve'
        self.inputs['Vecs'].hide_safe = self.mode in ['Number', 'Curve']
        self.inputs['Edges'].hide_safe = self.mode in ['Number', 'Path', 'Curve']
        self.inputs['Polygons'].hide_safe = self.mode in ['Number', 'Path', 'Curve']

    mode: EnumProperty(
        name='Mode',
        items=modes,
        default='Path',
        description="Display Mode",
        update=update_mode)

    working_plane: EnumProperty(
        name='Projection Plane',
        items=plane,
        default='XY',
        description="2D plane where geometry will be projected",
        update=update_mode)

    activate: BoolProperty(
        name='Show', description='Activate drawing',
        default=True, update=updateNode
    )
    cyclic: BoolProperty(
        name='Cycle', description='Join first and last vertices',
        default=True, update=updateNode
    )

    draw_scale: FloatProperty(
        min=0.0, default=10.0, name='Scale',
        description='Drawing Scale', update=updateNode
    )
    drawing_size: IntVectorProperty(
        update=updateNode, name='Size', default=(150, 150),
        size=2
        )
    draw_verts: BoolProperty(
        default=False, name='See Verts',
        description='Drawing Verts', update=updateNode
    )
    point_size: IntProperty(
        min=1, default=4, name='Verts Size',
        description='Point Size', update=updateNode
    )
    edge_width: IntProperty(
        min=1, default=1, name='Edge Width',
        description='Edge Width', update=updateNode
    )

    curve_samples: IntProperty(
        min=2, default=25, name='Samples',
        description='Curve Resolution', update=updateNode
    )
    vector_color: FloatVectorProperty(
        update=updateNode, name='Vertices Color', default=(.9, .9, .95, 1.0),
        size=4, min=0.0, max=1.0, subtype='COLOR'
        )
    vector_toggle: BoolProperty(
        update=updateNode, name='Display Vertices', default=True
        )
    vector_random_colors: BoolProperty(
        update=updateNode, name='Random Vertices Color', default=False
        )
    random_seed: IntProperty(
        min=1, default=1, name='Random Seed',
        description='Seed of random colors', update=updateNode
    )
    color_per_point: BoolProperty(
        update=updateNode, name='Color per point', default=False,
        description='Toggle between color per point or per object'
        )
    color_per_edge: BoolProperty(
        update=updateNode, name='Color per edge', default=False,
        description='Toggle between color per edge or per object'
        )
    color_per_polygon: BoolProperty(
        update=updateNode, name='Color per polygon', default=False,
        description='Toggle between color per polygon or per object'
        )
    polygon_use_vertex_color: BoolProperty(
        update=update_mode, name='Polys Vertex Color', default=False,
        description='Colorize polygons using vertices color'
        )
    edges_use_vertex_color: BoolProperty(
        update=update_mode, name='Edges Vertex Color', default=False,
        description='Colorize edges using vertices color'
        )

    edge_color: FloatVectorProperty(
        update=updateNode, name='Edges Color', default=(.9, .9, .35, 1.0),
        size=4, min=0.0, max=1.0, subtype='COLOR'
        )
    edge_toggle: BoolProperty(
        update=updateNode, name='Display Edges', default=True
        )
    polygon_color: FloatVectorProperty(
        update=updateNode, name='Ploygons Color', default=(.2, .7, 1.0, 1.0),
        size=4, min=0.0, max=1.0, subtype='COLOR'
        )
    polygon_toggle: BoolProperty(
        update=updateNode, name='Display Polygons', default=True
        )
    background_color: FloatVectorProperty(
        update=updateNode, name='', default=(.01, .01, .01, 1.0),
        size=4, min=0.0, max=1.0, subtype='COLOR'
        )
    draw_background: BoolProperty(
        update=updateNode, name='Display Background', default=True
        )

    location_theta: FloatProperty(name="location theta")

    def draw_buttons(self, context, layout):
        r0 = layout.row()
        r0.prop(self, "activate", text="", icon="HIDE_" + ("OFF" if self.activate else "ON"))
        r0.prop(self, "mode")
        c0 = layout.column(align=True)
        row = c0.row(align=True)
        row.prop(self, "draw_background", text='', icon='WORLD')
        if self.draw_background:
            row.prop(self, "background_color")


        if self.mode == 'Number':
            row = c0.row(align=True)
            for j in range(2):
                row.prop(self, 'drawing_size', index=j, text='XY'[j])
            row = c0.row(align=True)
            row.prop(self, "point_size")
            row.prop(self, "edge_width")

        else:
            row = c0.row(align=True)
            row.prop(self, "working_plane", expand=True)
            c0.prop(self, "draw_scale")
            row = c0.row(align=True)
            row.prop(self, "point_size")
            row.prop(self, "edge_width")

            if self.mode in ["Path", "Curve"]:
                layout.prop(self, "cyclic")
            if self.mode == "Curve":
                layout.prop(self, "curve_samples")

    def sv_init(self, context):
        self.inputs.new('SvStringsSocket', "Number")
        self.inputs.new('SvVerticesSocket', "Vecs")
        self.inputs.new('SvStringsSocket', "Edges")
        self.inputs.new('SvStringsSocket', "Polygons")
        self.inputs.new('SvCurveSocket', "Curve")
        vc0 = self.inputs.new('SvColorSocket', "Vector Color")
        vc0.prop_name = 'vector_color'
        vc0.custom_draw = 'draw_color_socket'
        vc = self.inputs.new('SvColorSocket', "Edge Color")
        vc.prop_name = 'edge_color'
        vc.custom_draw = 'draw_color_socket'
        vc2 = self.inputs.new('SvColorSocket', "Polygon Color")
        vc2.prop_name = 'polygon_color'
        vc2.custom_draw = 'draw_color_socket'
        self.id_data.update_gl_scale_info()
        self.update_sockets()

    def draw_color_socket(self, socket, context, layout):
        socket_info = socket_dict[socket.prop_name]
        layout.prop(self, socket_info[0], text="", icon=socket_info[1])
        layout.prop(self, socket_info[2], text="", icon='COLOR')
        display_color = not socket.is_linked
        draw_name = True
        if len(socket_info) < 5:
            layout.prop(self, socket_info[3], text="", icon='VPAINT_HLT')

        else:
            layout.prop(self, socket_info[3], text="", icon='MOD_NOISE')
            if socket_info[3] in self and self[socket_info[3]]:
                layout.prop(self, socket_info[4], text="Seed")
                draw_name = False

        if socket_info[3] in self:
            display_color = display_color and  not self[socket_info[3]]


        if display_color:
            layout.prop(self, socket.prop_name, text="")
        else:
            if draw_name:
                layout.label(text=socket.name+ '. ' + str(socket.objects_number))

    def get_drawing_attributes(self):
        """ obtain the dpi adjusted xy and scale factors, cache location_theta """
        scale, multiplier = get_params({
            'render_scale': 1.0, 'render_location_xy_multiplier': 1.0}, direct=True)
        self.location_theta = multiplier
        return scale

    def get_offset(self):
        return [int(j) for j in (Vector(self.absolute_location) + Vector((self.width + 20, 0)))[:]]
    def create_config(self):
        config = lambda: None
        scale = self.get_drawing_attributes()
        margin = 10* scale
        config.mode = self.mode
        config.loc = (0, 0 - margin)
        config.sys_scale = scale
        config.scale = scale * self.draw_scale
        config.cyclic = self.cyclic
        config.background_color = self.background_color
        config.draw_background = self.draw_background
        config.plane = self.working_plane
        config.draw_verts = self.vector_toggle
        config.draw_edges = self.edge_toggle
        config.draw_polys = self.polygon_toggle and self.inputs['Polygons'].is_linked
        config.point_size = self.point_size
        config.edge_width = self.edge_width
        config.color_per_point = self.color_per_point
        config.color_per_edge = self.color_per_edge
        config.color_per_polygon = self.color_per_polygon
        config.polygon_use_vertex_color = self.polygon_use_vertex_color
        config.edges_use_vertex_color = self.edges_use_vertex_color
        config.random_colors = self.vector_random_colors

        return config

    def process(self):
        n_id = node_id(self)
        nvBGL.callback_disable(n_id)
        inputs = self.inputs
        # end early
        if not self.activate:
            return

        if self.mode == 'Number':
            if not inputs['Number'].is_linked:
                return
            numbers = inputs['Number'].sv_get(default=[[]])
        elif self.mode == 'Curve':
            if not inputs['Curve'].is_linked:
                return
            curves = inputs['Curve'].sv_get(default=[[]])
        else:
            if not inputs['Vecs'].is_linked:
                return
            vecs = inputs['Vecs'].sv_get(default=[[]])

        edges = inputs['Edges'].sv_get(default=[[]])
        polygons = inputs['Polygons'].sv_get(default=[[]])
        vector_color = inputs['Vector Color'].sv_get(default=[[self.vector_color]])
        edge_color = inputs['Edge Color'].sv_get(default=[[self.edge_color]])
        poly_color = inputs['Polygon Color'].sv_get(default=[[self.polygon_color]])
        seed_set(self.random_seed)
        config = self.create_config()

        config.vector_color = vector_color
        config.edge_color = edge_color
        config.poly_color = poly_color
        config.edges = edges


        if self.mode == 'Number':
            config.size = self.drawing_size
            geom = generate_number_geom(config, numbers)
        elif self.mode == 'Path':
            geom = generate_graph_geom(config, vecs)
        elif self.mode == 'Curve':
            paths = []
            for curve in curves:
                t_min, t_max = curve.get_u_bounds()
                ts = np_linspace(t_min, t_max, num=self.curve_samples, dtype=np_float64)
                paths.append(curve.evaluate_array(ts).tolist())

            geom = generate_graph_geom(config, paths)

        else:
            config.polygons = polygons
            if not inputs['Edges'].is_linked and self.edge_toggle:
                config.edges = polygons_to_edges_np(polygons, unique_edges=True)

            geom = generate_mesh_geom(config, vecs)


        draw_data = {
            'mode': 'custom_function',
            'tree_name': self.id_data.name[:],
            'node_name': self.name[:],
            'loc': get_drawing_location,
            'custom_function': view_2d_geom,
            'args': (geom, config)
        }
        nvBGL.callback_enable(n_id, draw_data)

    def sv_free(self):
        nvBGL.callback_disable(node_id(self))

    def toggle_viewer(self, context):
        self.activate = not self.activate

classes = [SvViewer2D,]
register, unregister = bpy.utils.register_classes_factory(classes)
