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#
#  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.
#
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#  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.
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#  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.
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# ##### END GPL LICENSE BLOCK #####

from math import tan, sin, cos, degrees, radians


import bpy
import bmesh
from bpy.props import IntProperty, FloatProperty
from mathutils import Matrix

from sverchok.utils.sv_bmesh_utils import bmesh_from_pydata
from sverchok.node_tree import SverchCustomTreeNode
from sverchok.data_structure import (
    fullList, updateNode, Vector_generate
)



class SvOffsetNode(bpy.types.Node, SverchCustomTreeNode):
    ''' Doing offset of polygons '''
    bl_idname = 'SvOffsetNode'
    bl_label = 'Offset'
    bl_icon = 'OUTLINER_OB_EMPTY'
    sv_icon = 'SV_OFFSET'

    offset: FloatProperty(
        name='offset', description='distance of offset',
        default=0.04, update=updateNode)

    nsides: IntProperty(
        name='nsides', description='number of sides',
        default=1, min=1, max=64, update=updateNode)

    radius: FloatProperty(
        name='radius', description='radius of inset',
        default=0.04, min=0.0001, update=updateNode)

    def sv_init(self, context):
        self.inputs.new('SvVerticesSocket', 'Vers')
        self.inputs.new('SvStringsSocket', "Pols")
        self.inputs.new('SvStringsSocket', "Offset").prop_name = 'offset'
        self.inputs.new('SvStringsSocket', "N sides").prop_name = 'nsides'
        self.inputs.new('SvStringsSocket', "Radius").prop_name = 'radius'
        self.outputs.new('SvVerticesSocket', 'Vers')
        self.outputs.new('SvStringsSocket', "Edgs")
        self.outputs.new('SvStringsSocket', "OutPols")
        self.outputs.new('SvStringsSocket', "InPols")

    def process(self):

        if not (self.outputs['Vers'].is_linked and self.inputs['Vers'].is_linked):
            return

        vertices = Vector_generate(self.inputs['Vers'].sv_get())
        faces = self.inputs['Pols'].sv_get()
        offset = self.inputs['Offset'].sv_get()[0]
        nsides = self.inputs['N sides'].sv_get()[0][0]
        radius = self.inputs['Radius'].sv_get()[0]

        outv = []
        oute = []
        outo = []
        outn = []

        # for each object
        for verts_obj, faces_obj in zip(vertices, faces):
            fullList(offset, len(faces_obj))
            fullList(radius, len(faces_obj))
            verlen = set(range(len(verts_obj)))

            bm = bmesh_from_pydata(verts_obj, [], faces_obj, normal_update=True)
            result = self.Offset_pols(bm, offset, radius, nsides, verlen)
            outv.append(result[0])
            oute.append(result[1])
            outo.append(result[2])
            outn.append(result[3])

        self.outputs['Vers'].sv_set(outv)
        self.outputs['Edgs'].sv_set(oute)
        self.outputs['OutPols'].sv_set(outo)
        self.outputs['InPols'].sv_set(outn)

    # #################
    #   part from ofset operator in extra tools
    #   that in own place based completely on addon by zmj100
    #   in russian is called "Круговая порука", Various artists
    # #################

    @staticmethod
    def a_rot(ang, rp, axis, q):
        return (Matrix.Rotation(ang, 3, axis) * (q - rp)) + rp

    # #################
    # opp -     offset amount
    # n_ -      number of sides
    # adj1 -    radius
    # en0 -     corner type bmesh or triangle, we need bmesh opt0
    # kp -      keep face, not delete it.
    # #################

    def Offset_pols(self, bme, offset, radius, n_, verlen):

        bm_verts = bme.verts
        bm_faces = bme.faces
        bm_edges = bme.edges
        list_0 = bme.faces[:]

        list_del = []  # to delete old shape polygons
        for q, f in enumerate(list_0):
            adj1 = radius[q]
            opp = offset[q]

            f.select_set(0)
            list_del.append(f)
            # f.normal_update()

            list_2 = [v.index for v in f.verts]
            dict_0 = {}
            list_1 = []

            n = len(list_2)
            for i in range(n):
                dict_0[i] = []
                p = (bm_verts[list_2[i]].co).copy()
                p1 = (bm_verts[list_2[(i - 1) % n]].co).copy()
                p2 = (bm_verts[list_2[(i + 1) % n]].co).copy()
                dict_0[i].append(bm_verts[list_2[i]])
                vec1 = p - p1
                vec2 = p - p2
                ang = vec1.angle(vec2)
                adj = opp / tan(ang * 0.5)
                h = ((adj * adj) + (opp * opp)) ** 0.5

                quart = radians(90)
                if round(degrees(ang)) == 180 or round(degrees(ang)) == 0.0:
                    p6 = self.a_rot(quart, p, vec1, p - ((f.normal).normalized() * opp))
                    list_1.append(p6)
                else:
                    p6 = self.a_rot(
                        -quart,
                        p,
                        ((p - (vec1.normalized() * adj)) - (p - (vec2.normalized() * adj))),
                        p - ((f.normal).normalized() * h))
                    list_1.append(p6)

            list_2 = []
            n1_ = len(list_1)

            for j in range(n1_):
                q = list_1[j]
                q1 = list_1[(j - 1) % n1_]
                q2 = list_1[(j + 1) % n1_]
                vec1_ = q - q1
                vec2_ = q - q2
                ang_ = vec1_.angle(vec2_)

                if round(degrees(ang_)) == 180 or round(degrees(ang_)) == 0.0:
                    new_vert = bm_verts.new(q)
                    list_2.append(new_vert)
                    dict_0[j].append(new_vert)
                else:
                    opp_ = adj1

                    # radius flag deleted - have to depend on n_. if 0 no radius
                    if not n_:
                        h_ = adj1 * (1 / cos(ang_ * 0.5))
                        d = adj1
                    elif n_:
                        h_ = opp_ / sin(ang_ * 0.5)
                        d = opp_ / tan(ang_ * 0.5)

                    q3 = q - (vec1_.normalized() * d)
                    q4 = q - (vec2_.normalized() * d)
                    rp_ = q - ((q - ((q3 + q4) * 0.5)).normalized() * h_)
                    axis_ = vec1_.cross(vec2_)
                    vec3_ = rp_ - q3
                    vec4_ = rp_ - q4
                    rot_ang = vec3_.angle(vec4_)
                    list_3 = []

                    for o in range(n_ + 1):
                        q5 = self.a_rot((rot_ang * o / n_), rp_, axis_, q4)
                        new_vert = bm_verts.new(q5)
                        dict_0[j].append(new_vert)
                        list_3.append(new_vert)

                    list_3.reverse()
                    list_2.extend(list_3)

            new_face = bm_faces.new(list_2)
            new_face.select_set(1)

            n2_ = len(dict_0)
            for o in range(n2_):
                list_a = dict_0[o]
                list_b = dict_0[(o + 1) % n2_]
                bm_faces.new([list_a[0], list_b[0], list_b[-1], list_a[1]])

            # keeping triangulation of polygons commented
            for k in dict_0:
                if len(dict_0[k]) > 2:
                    bm_faces.new(dict_0[k])

            # new indices for next iteration of loop
            bm_verts.ensure_lookup_table()
            bm_faces.ensure_lookup_table()

        # remove old polygons
        _ = [bm_faces.remove(f) for f in list_del]

        # remove doubles
        bmesh.ops.remove_doubles(bme, dist=0.0001)

        # from Linus Yng solidify example
        edges = []
        faces = []
        newpols = []
        # clean and assign
        bm_verts.index_update()
        bm_edges.index_update()
        bm_faces.index_update()

        for edge in bme.edges[:]:
            edges.append([v.index for v in edge.verts[:]])
        verts = [vert.co[:] for vert in bme.verts[:]]
        for face in bme.faces:
            indexes = [v.index for v in face.verts[:]]
            if not verlen.intersection(indexes):
                newpols.append(indexes)
            else:
                faces.append(indexes)

        bme.free()
        return (verts, edges, faces, newpols)


def register():
    bpy.utils.register_class(SvOffsetNode)


def unregister():
    bpy.utils.unregister_class(SvOffsetNode)
