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# 「3Dビュー」エリア → 「ウェイトペイント」モード → ツールシェルフ → 「ウェイトツール」パネル
import os, re, sys, bpy, time, bmesh, mathutils
from . import common

# メニュー等に項目追加
def menu_func(self, context):
	icon_id = common.preview_collections['main']['KISS'].icon_id
	box = self.layout.box()
	column = box.column(align=False)
	column.prop(context.active_object.data, 'use_paint_mask_vertex', icon='VERTEXSEL', text="Vertex selection mode")
	column.operator('mesh.selected_mesh_vertex_group_blur', text="Blur the selected part", icon_value=icon_id)
	column.operator('mesh.selected_mesh_vertex_group_calculation', text="Four arithmetic operation", icon_value=icon_id)

class selected_mesh_vertex_group_blur(bpy.types.Operator):
	bl_idname = 'mesh.selected_mesh_vertex_group_blur'
	bl_label = "Blur the vertex group of the selected part"
	bl_description = "Blurs the vertex groups of the selected parts."
	bl_options = {'REGISTER', 'UNDO'}
	
	items = [
		('LINER', "Linear", "", 'LINCURVE', 1),
		('TRIGONOMETRIC', "Trigonometric", "", 'SMOOTHCURVE', 2),
		]
	smooth_method = bpy.props.EnumProperty(items=items, name="Damping type", default='TRIGONOMETRIC')
	
	selection_blur_range_multi = bpy.props.FloatProperty(name="Blur Range", default=4.0, min=0.0, max=100.0, soft_min=0.0, soft_max=100.0, step=50, precision=1)
	selection_blur_accuracy = bpy.props.IntProperty(name="Blur Accuracy", default=3, min=0, max=10, soft_min=1, soft_max=10)
	
	items = [
		('ALL', "All", "", 'COLLAPSEMENU', 1),
		('ACTIVE', "Active", "", 'LAYER_ACTIVE', 2),
		]
	target_vertex_group = bpy.props.EnumProperty(items=items, name="Target vertex groups", default='ALL')
	items = [
		('NORMAL', "Normal", "", 'BRUSH_BLUR', 1),
		('ADD', "Add", "", 'BRUSH_DARKEN', 2),
		('SUB', "Sub", "", 'BRUSH_LIGHTEN', 3),
		]
	blur_mode = bpy.props.EnumProperty(items=items, name="Blur Mode", default='NORMAL')
	blur_range_multi = bpy.props.FloatProperty(name="Blur Range", default=4.0, min=0.0, max=100.0, soft_min=0.0, soft_max=100.0, step=50, precision=1)
	blur_count = bpy.props.IntProperty(name="Blur Amount", default=1, min=1, max=100, soft_min=1, soft_max=100)
	is_vertex_group_limit_total = bpy.props.BoolProperty(name="Limit total weights.", default=True)
	
	@classmethod
	def poll(cls, context):
		ob = context.active_object
		if ob.type == 'MESH':
			if len(ob.vertex_groups):
				return len(ob.data.vertices) and len(ob.data.edges)
		return False
	
	def invoke(self, context, event):
		return context.window_manager.invoke_props_dialog(self)
	
	def draw(self, context):
		self.layout.prop(self, 'smooth_method')
		
		self.layout.label(text="Blur Selected", icon='UV_SYNC_SELECT')
		self.layout.prop(self, 'selection_blur_range_multi', text="Range | Average of side lengths ×")
		self.layout.prop(self, 'selection_blur_accuracy', text="Accuracy (number of steps)")
		
		self.layout.label(text="Blur Vertex Group", icon='GROUP_VERTEX')
		self.layout.prop(self, 'target_vertex_group', text="Target Group")
		self.layout.prop(self, 'blur_mode', text="Mode")
		self.layout.prop(self, 'blur_range_multi', text="Range | Average of side lengths ×")
		self.layout.prop(self, 'blur_count', text="Blur Count")
		self.layout.prop(self, 'is_vertex_group_limit_total', icon='IMGDISPLAY')
	
	def execute(self, context):
		class EmptyClass: pass
		
		ob = context.active_object
		me = ob.data
		
		pre_mode = ob.mode
		bpy.ops.object.mode_set(mode='OBJECT')
		
		pre_selected_objects = context.selected_objects[:]
		for selected_object in pre_selected_objects:
			selected_object.select = False
		ob.select = True
		
		bpy.ops.object.duplicate(linked=False, mode='TRANSLATION')
		
		selection_ob = context.active_object
		selection_me = selection_ob.data
		
		for v in selection_me.vertices:
			if v.hide: v.hide, v.select = False, False
		for e in selection_me.edges:
			if e.hide: e.hide, e.select = False, False
		for p in selection_me.polygons:
			if p.hide: p.hide, p.select = False, False
		
		bpy.ops.object.mode_set(mode='EDIT')
		bpy.ops.mesh.select_all(action='INVERT')
		if context.tool_settings.mesh_select_mode[0]:
			bpy.ops.mesh.delete(type='VERT')
		elif context.tool_settings.mesh_select_mode[1]:
			bpy.ops.mesh.delete(type='EDGE')
		elif context.tool_settings.mesh_select_mode[2]:
			bpy.ops.mesh.delete(type='FACE')
		bpy.ops.mesh.select_all(action='SELECT')
		if 1 <= self.selection_blur_accuracy:
			bpy.ops.mesh.subdivide(number_cuts=self.selection_blur_accuracy, smoothness=0, quadtri=False, quadcorner='INNERVERT', fractal=0, fractal_along_normal=0, seed=0)
		bpy.ops.object.mode_set(mode='OBJECT')
		
		selection_kd = mathutils.kdtree.KDTree(len(selection_me.vertices))
		[selection_kd.insert(v.co, v.index) for v in selection_me.vertices]
		selection_kd.balance()
		common.remove_data([selection_ob, selection_me])
		
		ob.select = True
		context.scene.objects.active = ob
		
		bm = bmesh.new()
		bm.from_mesh(me)
		edge_lengths = [e.calc_length() for e in bm.edges]
		bm.free()
		edge_lengths.sort()
		edge_lengths_center_index = int( (len(edge_lengths) - 1) * 0.5 )
		average_edge_length = edge_lengths[edge_lengths_center_index]
		selection_blur_range = average_edge_length * self.selection_blur_range_multi
		
		vert_selection_values = [None for v in me.vertices]
		for vert in me.vertices:
			co, index, dist = selection_kd.find(vert.co)
			if dist <= selection_blur_range + 0.00001:
				if 0 < selection_blur_range:
					if self.smooth_method == 'TRIGONOMETRIC':
						value = common.trigonometric_smooth(1.0 - (dist / selection_blur_range))
					else:
						value = 1.0 - (dist / selection_blur_range)
					vert_selection_values[vert.index] = value
				else:
					vert_selection_values[vert.index] = 1.0
		
		"""
		# 頂点カラーで選択状態を確認
		preview_vertex_color = me.vertex_colors.new()
		for loop in me.loops:
			v = vert_selection_values[loop.vertex_index]
			if v != None:
				preview_vertex_color.data[loop.index].color = (v, v, v)
			else:
				preview_vertex_color.data[loop.index].color = (0, 0, 0)
		"""
		
		kd = mathutils.kdtree.KDTree(len(me.vertices))
		[kd.insert(v.co, v.index) for v in me.vertices]
		kd.balance()
		
		blur_range = average_edge_length * self.blur_range_multi
		
		for i in range(self.blur_count):
			
			pre_vert_weights = [[0.0 for vg in ob.vertex_groups] for v in me.vertices]
			for vert in me.vertices:
				for vge in vert.groups:
					pre_vert_weights[vert.index][vge.group] = vge.weight
			
			for vert in me.vertices:
				selection_value = vert_selection_values[vert.index]
				if selection_value == None: continue
				
				near_infos = []
				total_effect = 0.0
				for co, index, dist in kd.find_range(vert.co, blur_range):
					ec = EmptyClass()
					ec.index = index
					if 0 < blur_range:
						raw_effect = 1.0 - (dist / blur_range)
						if self.smooth_method == 'TRIGONOMETRIC': ec.effect = common.trigonometric_smooth(raw_effect)
						else: ec.effect = raw_effect
					else:
						ec.effect = 1.0
					total_effect += ec.effect
					near_infos.append(ec)
				
				new_vert_weight = [0.0 for vg in ob.vertex_groups]
				for ec in near_infos:
					pre_vert_weight = pre_vert_weights[ec.index]
					weight_multi = ec.effect / total_effect
					for vg_index, near_vert_pre_weight_value in enumerate(pre_vert_weight):
						current_vert_pre_weight_value = pre_vert_weights[vert.index][vg_index]
						
						if self.blur_mode == 'NORMAL':
							send_weight_value = near_vert_pre_weight_value
						elif self.blur_mode == 'ADD':
							if current_vert_pre_weight_value < near_vert_pre_weight_value:
								send_weight_value = near_vert_pre_weight_value
							else:
								send_weight_value = current_vert_pre_weight_value
						elif self.blur_mode == 'SUB':
							if near_vert_pre_weight_value < current_vert_pre_weight_value:
								send_weight_value = near_vert_pre_weight_value
							else:
								send_weight_value = current_vert_pre_weight_value
						
						new_vert_weight[vg_index] += send_weight_value * weight_multi
				
				for vg in ob.vertex_groups:
					if self.target_vertex_group == 'ACTIVE' and ob.vertex_groups.active.name != vg.name: continue
					if vg.lock_weight: continue
					
					pre_weight = pre_vert_weights[vert.index][vg.index]
					new_weight = new_vert_weight[vg.index]
					result_weight = (pre_weight * (1.0 - selection_value)) + (new_weight * selection_value)
					
					if 0.0 < result_weight:
						vg.add([vert.index], result_weight, 'REPLACE')
					else:
						vg.remove([vert.index])
		
		if self.is_vertex_group_limit_total:
			bpy.ops.object.vertex_group_limit_total(group_select_mode='ALL', limit=4)
		
		bpy.ops.object.mode_set(mode=pre_mode)
		for selected_object in pre_selected_objects:
			selected_object.select = True
		return {'FINISHED'}

class selected_mesh_vertex_group_calculation(bpy.types.Operator):
	bl_idname = 'mesh.selected_mesh_vertex_group_calculation'
	bl_label = "Four arithmetic operations on the vertex groups of the selection"
	bl_description = "Applies four arithmetic operations to the vertex groups of selection."
	bl_options = {'REGISTER', 'UNDO'}
	
	items = [
		('LINER', "Iinear", "", 'LINCURVE', 1),
		('TRIGONOMETRIC', "Trigonometric", "", 'SMOOTHCURVE', 2),
		]
	smooth_method = bpy.props.EnumProperty(items=items, name="Smooth Methid", default='TRIGONOMETRIC')
	
	selection_blur_range_multi = bpy.props.FloatProperty(name="Blur Range", default=4.0, min=0.0, max=100.0, soft_min=0.0, soft_max=100.0, step=50, precision=1)
	selection_blur_accuracy = bpy.props.IntProperty(name="Blur Accuracy", default=3, min=0, max=10, soft_min=1, soft_max=10)
	
	items = [
		('ACTIVE', "Active", "", 'LAYER_ACTIVE', 1),
		]
	target_vertex_group = bpy.props.EnumProperty(items=items, name="Target Vertex Group", default='ACTIVE')
	items = [
		('ADD', "Add", "", 'ZOOMIN', 1),
		('SUB', "Sub", "", 'ZOOMOUT', 2),
		('MULTI', "Multi", "", 'X', 3),
		('DIV', "Div", "", 'FULLSCREEN_EXIT', 4),
		]
	calculation_mode = bpy.props.EnumProperty(items=items, name="Arithmetic operation mode", default='ADD')
	calculation_value = bpy.props.FloatProperty(name="Value", default=1.0, min=-100.0, max=100.0, soft_min=-100.0, soft_max=100.0, step=10, precision=1)
	
	@classmethod
	def poll(cls, context):
		ob = context.active_object
		if ob.type == 'MESH':
			return bool(len(ob.vertex_groups))
		return False
	
	def draw(self, context):
		self.layout.label(text="Blur the selection of the vertex groups.", icon='UV_SYNC_SELECT')
		self.layout.prop(self, 'smooth_method')
		self.layout.prop(self, 'selection_blur_range_multi', text="Range | Average of side length ×")
		self.layout.prop(self, 'selection_blur_accuracy', text="Accuracy (Steps)")
		
		self.layout.label(text="Four arithmetic operations", icon='BRUSH_ADD')
		self.layout.prop(self, 'target_vertex_group', text="Target Group")
		self.layout.prop(self, 'calculation_mode', text="Mode")
		self.layout.prop(self, 'calculation_value', text="Value")
		
		calculation_text = "Expression: Original weight "
		if self.calculation_mode == 'ADD': calculation_text += "＋"
		elif self.calculation_mode == 'SUB': calculation_text += "－"
		elif self.calculation_mode == 'MULTI': calculation_text += "×"
		elif self.calculation_mode == 'DIV': calculation_text += "÷"
		calculation_text += " " + str(round(self.calculation_value, 1))
		self.layout.label(text=calculation_text)
	
	def execute(self, context):
		class EmptyClass: pass
		
		if self.calculation_mode == 'DIV' and self.calculation_value == 0.0:
			self.report(type={'ERROR'}, message="Cannot divide by zero, Aborting.")
			return {'CANCELLED'}
		
		ob = context.active_object
		me = ob.data
		
		pre_mode = ob.mode
		bpy.ops.object.mode_set(mode='OBJECT')
		
		pre_selected_objects = context.selected_objects[:]
		for selected_object in pre_selected_objects:
			selected_object.select = False
		ob.select = True
		
		bpy.ops.object.duplicate(linked=False, mode='TRANSLATION')
		
		selection_ob = context.active_object
		selection_me = selection_ob.data
		
		for v in selection_me.vertices:
			if v.hide: v.hide, v.select = False, False
		for e in selection_me.edges:
			if e.hide: e.hide, e.select = False, False
		for p in selection_me.polygons:
			if p.hide: p.hide, p.select = False, False
		
		bpy.ops.object.mode_set(mode='EDIT')
		bpy.ops.mesh.select_all(action='INVERT')
		if context.tool_settings.mesh_select_mode[0]:
			bpy.ops.mesh.delete(type='VERT')
		elif context.tool_settings.mesh_select_mode[1]:
			bpy.ops.mesh.delete(type='EDGE')
		elif context.tool_settings.mesh_select_mode[2]:
			bpy.ops.mesh.delete(type='FACE')
		bpy.ops.mesh.select_all(action='SELECT')
		if 1 <= self.selection_blur_accuracy:
			bpy.ops.mesh.subdivide(number_cuts=self.selection_blur_accuracy, smoothness=0, quadtri=False, quadcorner='INNERVERT', fractal=0, fractal_along_normal=0, seed=0)
		bpy.ops.object.mode_set(mode='OBJECT')
		
		selection_kd = mathutils.kdtree.KDTree(len(selection_me.vertices))
		[selection_kd.insert(v.co, v.index) for v in selection_me.vertices]
		selection_kd.balance()
		common.remove_data([selection_ob, selection_me])
		
		ob.select = True
		context.scene.objects.active = ob
		
		bm = bmesh.new()
		bm.from_mesh(me)
		edge_lengths = [e.calc_length() for e in bm.edges]
		bm.free()
		edge_lengths.sort()
		edge_lengths_center_index = int( (len(edge_lengths) - 1) * 0.5 )
		average_edge_length = edge_lengths[edge_lengths_center_index]
		selection_blur_range = average_edge_length * self.selection_blur_range_multi
		
		vert_selection_values = [None for v in me.vertices]
		for vert in me.vertices:
			co, index, dist = selection_kd.find(vert.co)
			if dist <= selection_blur_range + 0.00001:
				if 0 < selection_blur_range:
					if self.smooth_method == 'TRIGONOMETRIC':
						value = common.trigonometric_smooth(1.0 - (dist / selection_blur_range))
					else:
						value = 1.0 - (dist / selection_blur_range)
					vert_selection_values[vert.index] = value
				else:
					vert_selection_values[vert.index] = 1.0
		
		"""
		# 頂点カラーで選択状態を確認
		preview_vertex_color = me.vertex_colors.new()
		for loop in me.loops:
			v = vert_selection_values[loop.vertex_index]
			if v != None:
				preview_vertex_color.data[loop.index].color = (v, v, v)
			else:
				preview_vertex_color.data[loop.index].color = (0, 0, 0)
		"""
		
		for vert in me.vertices:
			effect = vert_selection_values[vert.index]
			if effect == None: continue
			
			pre_vert_weight = 0.0
			for vge in vert.groups:
				if ob.vertex_groups.active.index == vge.group:
					pre_vert_weight = vge.weight
			
			if self.calculation_mode == 'ADD':
				new_vert_weight = pre_vert_weight + self.calculation_value
			elif self.calculation_mode == 'SUB':
				new_vert_weight = pre_vert_weight - self.calculation_value
			elif self.calculation_mode == 'MULTI':
				new_vert_weight = pre_vert_weight * self.calculation_value
			elif self.calculation_mode == 'DIV':
				new_vert_weight = pre_vert_weight / self.calculation_value
			
			if new_vert_weight < 0.0:
				new_vert_weight = 0.0
			elif 1.0 < new_vert_weight:
				new_vert_weight = 1.0
			
			new_vert_weight = (pre_vert_weight * (1.0 - effect)) + (new_vert_weight * effect)
			
			if 0.0 < new_vert_weight:
				ob.vertex_groups.active.add([vert.index], new_vert_weight, 'REPLACE')
			else:
				ob.vertex_groups.active.remove([vert.index])
		
		bpy.ops.object.mode_set(mode=pre_mode)
		for selected_object in pre_selected_objects:
			selected_object.select = True
		return {'FINISHED'}