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

__author__ = "Nutti <nutti.metro@gmail.com>, Jace Priester"
__status__ = "production"
__version__ = "5.1"
__date__ = "24 Feb 2018"

import math
from math import atan2, sin, cos

import bpy
import bmesh
from mathutils import Vector

from .. import common


class MUV_CPUVIECopyUV(bpy.types.Operator):
    """
    Operation class: Copy UV coordinate on UV/Image Editor
    """

    bl_idname = "uv.muv_cpuv_ie_copy_uv"
    bl_label = "Copy UV"
    bl_description = "Copy UV coordinate (only selected in UV/Image Editor)"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.mode == 'EDIT_MESH'

    def execute(self, context):
        props = context.scene.muv_props.cpuv
        obj = context.active_object
        bm = bmesh.from_edit_mesh(obj.data)
        uv_layer = bm.loops.layers.uv.verify()
        if common.check_version(2, 73, 0) >= 0:
            bm.faces.ensure_lookup_table()

        for face in bm.faces:
            if not face.select:
                continue
            skip = False
            for l in face.loops:
                if not l[uv_layer].select:
                    skip = True
                    break
            if skip:
                continue
            props.src_uvs.append([l[uv_layer].uv.copy() for l in face.loops])

        return {'FINISHED'}


class MUV_CPUVIEPasteUV(bpy.types.Operator):
    """
    Operation class: Paste UV coordinate on UV/Image Editor
    """

    bl_idname = "uv.muv_cpuv_ie_paste_uv"
    bl_label = "Paste UV"
    bl_description = "Paste UV coordinate (only selected in UV/Image Editor)"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.mode == 'EDIT_MESH'

    def execute(self, context):
        props = context.scene.muv_props.cpuv
        obj = context.active_object
        bm = bmesh.from_edit_mesh(obj.data)
        uv_layer = bm.loops.layers.uv.verify()
        if common.check_version(2, 73, 0) >= 0:
            bm.faces.ensure_lookup_table()

        dest_uvs = []
        dest_face_indices = []
        for face in bm.faces:
            if not face.select:
                continue
            skip = False
            for l in face.loops:
                if not l[uv_layer].select:
                    skip = True
                    break
            if skip:
                continue
            dest_face_indices.append(face.index)
            uvs = [l[uv_layer].uv.copy() for l in face.loops]
            dest_uvs.append(uvs)

        for suvs, duvs in zip(props.src_uvs, dest_uvs):
            src_diff = suvs[1] - suvs[0]
            dest_diff = duvs[1] - duvs[0]

            src_base = suvs[0]
            dest_base = duvs[0]

            src_rad = atan2(src_diff.y, src_diff.x)
            dest_rad = atan2(dest_diff.y, dest_diff.x)
            if src_rad < dest_rad:
                radian = dest_rad - src_rad
            elif src_rad > dest_rad:
                radian = math.pi * 2 - (src_rad - dest_rad)
            else:       # src_rad == dest_rad
                radian = 0.0

            ratio = dest_diff.length / src_diff.length
            break

        for suvs, fidx in zip(props.src_uvs, dest_face_indices):
            for l, suv in zip(bm.faces[fidx].loops, suvs):
                base = suv - src_base
                radian_ref = atan2(base.y, base.x)
                radian_fin = (radian + radian_ref)
                length = base.length
                turn = Vector((length * cos(radian_fin),
                               length * sin(radian_fin)))
                target_uv = Vector((turn.x * ratio, turn.y * ratio)) + \
                    dest_base
                l[uv_layer].uv = target_uv

        bmesh.update_edit_mesh(obj.data)

        return {'FINISHED'}