import os
import bpy

#####################################################
#### Helpers ####



# Makes an empty, at location, stores it in existing collection, from https://blender.stackexchange.com/questions/51290/how-to-add-empty-object-not-using-bpy-ops
def make_empty(name, location, coll_name): #string, vector, string of existing coll
    empty_obj = bpy.data.objects.new( "empty", None, )
    empty_obj.name = name
    empty_obj.empty_display_size = 1 
    bpy.data.collections[coll_name].objects.link(empty_obj)
    empty_obj.location = location
    return empty_obj


def make_empty2(name, location, collection):
    object_data = None #bpy.data.meshes.new("NewMesh") #None
    empty_obj = bpy.data.objects.new( name, object_data )
    empty_obj.name = name
    empty_obj.location = location


    empty_obj.empty_display_size = 2
    empty_obj.empty_display_type = 'PLAIN_AXES'   
    collection.objects.link( empty_obj )
    return empty_obj

def make_empty3(name, location, rotation, scale, collection): 
    original_active_object = bpy.context.active_object
    bpy.ops.object.empty_add(type='PLAIN_AXES', location=location, rotation=rotation, scale=scale)
    empty_obj = bpy.context.active_object
    empty_obj.name = name
    empty_obj.scale = scale # scale is not set correctly ?????
    bpy.context.view_layer.objects.active = original_active_object
    return empty_obj

# traverse all collections
def traverse_tree(t):
    yield t
    for child in t.children:
        yield from traverse_tree(child)


def check_if_blueprints_exist(collections, folder_path, extension):
    not_found_blueprints = []
    for collection_name in collections:
        gltf_output_path = os.path.join(folder_path, collection_name + extension)
        # print("gltf_output_path", gltf_output_path)
        found = os.path.exists(gltf_output_path) and os.path.isfile(gltf_output_path)
        if not found:
            not_found_blueprints.append(collection_name)
    return not_found_blueprints


def check_if_blueprint_on_disk(scene_name, folder_path, extension):
    gltf_output_path = os.path.join(folder_path, scene_name + extension)
    found = os.path.exists(gltf_output_path) and os.path.isfile(gltf_output_path)
    print("level", scene_name, "found", found, "path", gltf_output_path)
    return found