from collections import namedtuple
from functools import partial

ARN = namedtuple("ARN", ["region", "account", "function_name", "version"])
LAYER_ARN = namedtuple("LAYER_ARN", ["region", "account", "layer_name", "version"])


def make_arn(resource_type, region, account, name):
    return "arn:aws:lambda:{0}:{1}:{2}:{3}".format(region, account, resource_type, name)


make_function_arn = partial(make_arn, "function")
make_layer_arn = partial(make_arn, "layer")


def make_ver_arn(resource_type, region, account, name, version="1"):
    arn = make_arn(resource_type, region, account, name)
    return "{0}:{1}".format(arn, version)


make_function_ver_arn = partial(make_ver_arn, "function")
make_layer_ver_arn = partial(make_ver_arn, "layer")


def split_arn(arn_type, arn):
    arn = arn.replace("arn:aws:lambda:", "")

    region, account, _, name, version = arn.split(":")

    return arn_type(region, account, name, version)


split_function_arn = partial(split_arn, ARN)
split_layer_arn = partial(split_arn, LAYER_ARN)