# coding: utf-8
# Copyright (C) 2023 Ilia Kurochkin <brothermechanic@gmail.com>
#
# 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 3 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.
'''
DESCRIPTION.
Various collection tools.
'''
__version__ = '0.1'

import bpy
from collections import defaultdict


def copy_objects(from_col, to_col, linked, double_lut):
    '''Function copying objects from collection to collection.'''
    for obj in from_col.objects:
        double = obj.copy()
        if not linked and obj.data:
            double.data = double.data.copy()
        to_col.objects.link(double)
        double_lut[obj] = double
    return True


def copy_collections_recursive(collection, suffix='copy', linked=False):
    '''Function recursive copying collection.'''
    double_lut = defaultdict(lambda: None)
    parent = [p for p in (bpy.data.collections[:] + [bpy.context.scene.collection])
              if collection.name in p.children.keys()][0]

    def _copy(parent, collection, suffix, linked=False):
        '''Function copying collection.'''
        clone_collection = bpy.data.collections.new(
            '_'.join((collection.name, suffix))
        )
        copy_objects(collection, clone_collection, linked, double_lut)

        for _collection in collection.children:
            _copy(clone_collection, _collection, suffix, linked)

        parent.children.link(clone_collection)

    _copy(parent, collection, suffix, linked)
    for obj, double in tuple(double_lut.items()):
        parent = double_lut[obj.parent]
        if parent:
            double.parent = parent
    return True