# <pep8-80 compliant>

# ##### 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 #####

__author__ = "Alexander Milovsky, Nutti <nutti.metro@gmail.com>"
__status__ = "production"
__version__ = "6.1"
__date__ = "19 May 2019"

from math import sin, cos, pi

import bpy
import bmesh
from bpy.props import (
    FloatProperty,
    FloatVectorProperty,
    BoolProperty
)
from mathutils import Vector

from .. import common
from ..utils.bl_class_registry import BlClassRegistry
from ..utils.property_class_registry import PropertyClassRegistry
from ..utils import compatibility as compat


def _is_valid_context(context):
    obj = context.object

    # only edit mode is allowed to execute
    if obj is None:
        return False
    if obj.type != 'MESH':
        return False
    if context.object.mode != 'EDIT':
        return False

    # only 'VIEW_3D' space is allowed to execute
    for space in context.area.spaces:
        if space.type == 'VIEW_3D':
            break
    else:
        return False

    return True


def _get_uv_layer(ops_obj, bm, assign_uvmap):
    # get UV layer
    if not bm.loops.layers.uv:
        if assign_uvmap:
            bm.loops.layers.uv.new()
        else:
            ops_obj.report({'WARNING'},
                           "Object must have more than one UV map")
            return None
    uv_layer = bm.loops.layers.uv.verify()

    return uv_layer


def _apply_box_map(bm, uv_layer, size, offset, rotation, tex_aspect):
    scale = 1.0 / size

    sx = 1.0 * scale
    sy = 1.0 * scale
    sz = 1.0 * scale
    ofx = offset[0]
    ofy = offset[1]
    ofz = offset[2]
    rx = rotation[0] * pi / 180.0
    ry = rotation[1] * pi / 180.0
    rz = rotation[2] * pi / 180.0
    aspect = tex_aspect

    sel_faces = [f for f in bm.faces if f.select]

    # update UV coordinate
    for f in sel_faces:
        n = f.normal
        for l in f.loops:
            co = l.vert.co
            x = co.x * sx
            y = co.y * sy
            z = co.z * sz

            # X-plane
            if abs(n[0]) >= abs(n[1]) and abs(n[0]) >= abs(n[2]):
                if n[0] >= 0.0:
                    u = (y - ofy) * cos(rx) + (z - ofz) * sin(rx)
                    v = -(y * aspect - ofy) * sin(rx) + \
                        (z * aspect - ofz) * cos(rx)
                else:
                    u = -(y - ofy) * cos(rx) + (z - ofz) * sin(rx)
                    v = (y * aspect - ofy) * sin(rx) + \
                        (z * aspect - ofz) * cos(rx)
            # Y-plane
            elif abs(n[1]) >= abs(n[0]) and abs(n[1]) >= abs(n[2]):
                if n[1] >= 0.0:
                    u = -(x - ofx) * cos(ry) + (z - ofz) * sin(ry)
                    v = (x * aspect - ofx) * sin(ry) + \
                        (z * aspect - ofz) * cos(ry)
                else:
                    u = (x - ofx) * cos(ry) + (z - ofz) * sin(ry)
                    v = -(x * aspect - ofx) * sin(ry) + \
                        (z * aspect - ofz) * cos(ry)
            # Z-plane
            else:
                if n[2] >= 0.0:
                    u = (x - ofx) * cos(rz) + (y - ofy) * sin(rz)
                    v = -(x * aspect - ofx) * sin(rz) + \
                        (y * aspect - ofy) * cos(rz)
                else:
                    u = -(x - ofx) * cos(rz) - (y + ofy) * sin(rz)
                    v = -(x * aspect + ofx) * sin(rz) + \
                        (y * aspect - ofy) * cos(rz)

            l[uv_layer].uv = Vector((u, v))


def _apply_planer_map(bm, uv_layer, size, offset, rotation, tex_aspect):
    scale = 1.0 / size

    sx = 1.0 * scale
    sy = 1.0 * scale
    ofx = offset[0]
    ofy = offset[1]
    rz = rotation * pi / 180.0
    aspect = tex_aspect

    sel_faces = [f for f in bm.faces if f.select]

    # calculate average of normal
    n_ave = Vector((0.0, 0.0, 0.0))
    for f in sel_faces:
        n_ave = n_ave + f.normal
    q = n_ave.rotation_difference(Vector((0.0, 0.0, 1.0)))

    # update UV coordinate
    for f in sel_faces:
        for l in f.loops:
            co = compat.matmul(q, l.vert.co)
            x = co.x * sx
            y = co.y * sy

            u = x * cos(rz) - y * sin(rz) + ofx
            v = -x * aspect * sin(rz) - y * aspect * cos(rz) + ofy

            l[uv_layer].uv = Vector((u, v))


@PropertyClassRegistry()
class _Properties:
    idname = "uvw"

    @classmethod
    def init_props(cls, scene):
        scene.muv_uvw_enabled = BoolProperty(
            name="UVW Enabled",
            description="UVW is enabled",
            default=False
        )
        scene.muv_uvw_assign_uvmap = BoolProperty(
            name="Assign UVMap",
            description="Assign UVMap when no UVmaps are available",
            default=True
        )

    @classmethod
    def del_props(cls, scene):
        del scene.muv_uvw_enabled
        del scene.muv_uvw_assign_uvmap


@BlClassRegistry()
@compat.make_annotations
class MUV_OT_UVW_BoxMap(bpy.types.Operator):
    bl_idname = "uv.muv_uvw_box_map"
    bl_label = "Box Map"
    bl_options = {'REGISTER', 'UNDO'}

    size = FloatProperty(
        name="Size",
        default=1.0,
        precision=4
    )
    rotation = FloatVectorProperty(
        name="XYZ Rotation",
        size=3,
        default=(0.0, 0.0, 0.0)
    )
    offset = FloatVectorProperty(
        name="XYZ Offset",
        size=3,
        default=(0.0, 0.0, 0.0)
    )
    tex_aspect = FloatProperty(
        name="Texture Aspect",
        default=1.0,
        precision=4
    )
    assign_uvmap = BoolProperty(
        name="Assign UVMap",
        description="Assign UVMap when no UVmaps are available",
        default=True
    )

    @classmethod
    def poll(cls, context):
        # we can not get area/space/region from console
        if common.is_console_mode():
            return True
        return _is_valid_context(context)

    def execute(self, context):
        obj = context.active_object
        bm = bmesh.from_edit_mesh(obj.data)
        if common.check_version(2, 73, 0) >= 0:
            bm.faces.ensure_lookup_table()

        # get UV layer
        uv_layer = _get_uv_layer(self, bm, self.assign_uvmap)
        if not uv_layer:
            return {'CANCELLED'}

        _apply_box_map(bm, uv_layer, self.size, self.offset, self.rotation,
                       self.tex_aspect)
        bmesh.update_edit_mesh(obj.data)

        return {'FINISHED'}


@BlClassRegistry()
@compat.make_annotations
class MUV_OT_UVW_BestPlanerMap(bpy.types.Operator):
    bl_idname = "uv.muv_uvw_best_planer_map"
    bl_label = "Best Planer Map"
    bl_options = {'REGISTER', 'UNDO'}

    size = FloatProperty(
        name="Size",
        default=1.0,
        precision=4
    )
    rotation = FloatProperty(
        name="XY Rotation",
        default=0.0
    )
    offset = FloatVectorProperty(
        name="XY Offset",
        size=2,
        default=(0.0, 0.0)
    )
    tex_aspect = FloatProperty(
        name="Texture Aspect",
        default=1.0,
        precision=4
    )
    assign_uvmap = BoolProperty(
        name="Assign UVMap",
        description="Assign UVMap when no UVmaps are available",
        default=True
    )

    @classmethod
    def poll(cls, context):
        # we can not get area/space/region from console
        if common.is_console_mode():
            return True
        return _is_valid_context(context)

    def execute(self, context):
        obj = context.active_object
        bm = bmesh.from_edit_mesh(obj.data)
        if common.check_version(2, 73, 0) >= 0:
            bm.faces.ensure_lookup_table()

        # get UV layer
        uv_layer = _get_uv_layer(self, bm, self.assign_uvmap)
        if not uv_layer:
            return {'CANCELLED'}

        _apply_planer_map(bm, uv_layer, self.size, self.offset, self.rotation,
                          self.tex_aspect)

        bmesh.update_edit_mesh(obj.data)

        return {'FINISHED'}
