# GPL # Original Author Liero #

import bpy
from bpy.props import StringProperty, BoolProperty, EnumProperty

def centro(sel):
    x = sum([obj.location[0] for obj in sel])/len(sel)
    y = sum([obj.location[1] for obj in sel])/len(sel)
    z = sum([obj.location[2] for obj in sel])/len(sel)
    return (x,y,z)


class P2E(bpy.types.Operator):
    bl_idname = 'object.parent_to_empty'
    bl_label = 'Parent to Empty'
    bl_description = 'Parent selected objects to a new Empty'
    bl_options = {'REGISTER', 'UNDO'}

    nombre = StringProperty(name='', default='OBJECTS', description='Give the empty / group a name')
    grupo = bpy.props.BoolProperty(name='Create Group', default=False, description='Also add objects to a group')
    locat = bpy.props.EnumProperty(name='', items=[('CURSOR','Cursor','Cursor'),('ACTIVE','Active','Active'),
    ('CENTER','Center','Selection Center')],description='Empty location', default='CENTER')
    renom = bpy.props.BoolProperty(name='Add Prefix', default=False, description='Add prefix to objects name')

    @classmethod
    def poll(cls, context):
        objs = context.selected_objects
        return (len(objs) > 0)

    def draw(self, context):
        layout = self.layout
        layout.prop(self,'nombre')
        column = layout.column(align=True)
        column.prop(self,'locat')
        column.prop(self,'grupo')
        column.prop(self,'renom')

    def execute(self, context):
        objs = context.selected_objects
        act = context.object
        sce = context.scene
        try: bpy.ops.object.mode_set()
        except: pass
        if self.locat == 'CURSOR':
            loc = sce.cursor_location
        elif self.locat == 'ACTIVE':
            loc = act.location
        else:
            loc = centro(objs) 
        
        bpy.ops.object.add(type='EMPTY',location=loc)
        context.object.name = self.nombre
        context.object.show_name = True
        context.object.show_x_ray = True
            
        if self.grupo:
            bpy.ops.group.create(name=self.nombre)
            bpy.ops.group.objects_add_active()
            
        for o in objs:
            o.select = True
            if not o.parent:
                bpy.ops.object.parent_set(type='OBJECT')
            if self.grupo:
                bpy.ops.group.objects_add_active()
            o.select = False
        for o in objs:
            if self.renom:
                o.name = self.nombre+'_'+o.name
        return {'FINISHED'}


class PreFix(bpy.types.Operator):
    bl_idname = 'object.toggle_prefix'
    bl_label = 'Toggle Sufix'
    bl_description = 'Toggle parent name as sufix for c'
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        act = bpy.context.object
        return (act and act.type == 'EMPTY')

    def execute(self, context):
        act = bpy.context.object
        objs = act.children
        prefix = act.name+'_'
        remove = False
        for o in objs:
            if o.name.startswith(prefix):
                remove = True
                break

        if remove == True:
            for o in objs:
                if o.name.startswith(prefix):
                    o.name = o.name.partition(prefix)[2]
        else:
            for o in objs:
                o.name = prefix+o.name

        return {'FINISHED'}


class PanelP2E(bpy.types.Panel):
    bl_label = 'Parent to Empty'
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'TOOLS'
    bl_category = 'Relations'

    def draw(self, context):
        layout = self.layout
        layout.operator('object.parent_to_empty')
        layout.operator('object.toggle_prefix')