# Copyright 2019 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

load("//pw_build:compatibility.bzl", "host_backend_alias")
load(
    "//pw_build:pigweed.bzl",
    "pw_facade",
)

package(default_visibility = ["//visibility:public"])

licenses(["notice"])

constraint_setting(
    name = "backend_constraint_setting",
    default_constraint_value = "unspecified",
)

constraint_value(
    name = "unspecified",
    constraint_setting = ":backend_constraint_setting",
)

# TODO: pwbug.dev/328679085 - Remove this alias once no-one uses it.
alias(
    name = "facade",
    actual = ":pw_sys_io.facade",
)

pw_facade(
    name = "pw_sys_io",
    hdrs = ["public/pw_sys_io/sys_io.h"],
    backend = ":backend",
    includes = ["public"],
    deps = [
        "//pw_bytes",
        "//pw_status",
    ],
)

label_flag(
    name = "backend",
    build_setting_default = ":backend_multiplexer",
)

cc_library(
    name = "default_putget_bytes",
    srcs = ["sys_io.cc"],
    deps = [
        ":facade",
        "//pw_span",
        "//pw_status",
    ],
)

alias(
    name = "backend_multiplexer",
    actual = select({
        "//pw_sys_io_arduino:backend": "@pigweed//pw_sys_io_arduino",
        "//pw_sys_io_baremetal_lm3s6965evb:backend": "@pigweed//pw_sys_io_baremetal_lm3s6965evb",
        "//pw_sys_io_baremetal_stm32f429:backend": "@pigweed//pw_sys_io_baremetal_stm32f429",
        "//pw_sys_io_emcraft_sf2:backend": "@pigweed//pw_sys_io_emcraft_sf2",
        "//pw_sys_io_mcuxpresso:backend": "@pigweed//pw_sys_io_mcuxpresso",
        "//pw_sys_io_rp2040:backend": "@pigweed//pw_sys_io_rp2040",
        "//pw_sys_io_stdio:backend": "@pigweed//pw_sys_io_stdio",
        "//pw_sys_io_stm32cube:backend": "@pigweed//pw_sys_io_stm32cube",
        ":unspecified": ":unspecified_backend",
        "//conditions:default": ":unspecified_backend",
    }),
    visibility = ["@pigweed//targets:__pkg__"],
)

host_backend_alias(
    name = "unspecified_backend",
    backend = "@pigweed//pw_sys_io_stdio",
)