# Copyright 2021 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.

import("//build_overrides/pigweed.gni")

import("$dir_pw_build/python.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_protobuf_compiler/proto.gni")
import("nanopb.gni")

# This file defines a GN source_set for an external installation of nanopb.
# To use, checkout the nanopb source into a directory, then set the build arg
# dir_pw_third_party_nanopb to point to that directory. The nanopb library
# will be available in GN at "$dir_pw_third_party/nanopb".
if (dir_pw_third_party_nanopb != "") {
  config("includes") {
    include_dirs = [ dir_pw_third_party_nanopb ]
  }

  pw_source_set("nanopb") {
    public_configs = [ ":includes" ]
    public = [
      "$dir_pw_third_party_nanopb/pb.h",
      "$dir_pw_third_party_nanopb/pb_common.h",
      "$dir_pw_third_party_nanopb/pb_decode.h",
      "$dir_pw_third_party_nanopb/pb_encode.h",
    ]
    sources = [
      "$dir_pw_third_party_nanopb/pb_common.c",
      "$dir_pw_third_party_nanopb/pb_decode.c",
      "$dir_pw_third_party_nanopb/pb_encode.c",
    ]
  }

  pw_proto_library("proto") {
    strip_prefix = "$dir_pw_third_party_nanopb/generator/proto"
    sources = [ "$dir_pw_third_party_nanopb/generator/proto/nanopb.proto" ]
    python_module_as_package = "nanopb_pb2"
  }

  # Generates nanopb_pb2.py, which is needed to compile protobufs with Nanopb.
  pw_python_script("generate_nanopb_proto") {
    sources = [ "generate_nanopb_proto.py" ]
    pylintrc = "$dir_pigweed/.pylintrc"
    action = {
      args = [ rebase_path(dir_pw_third_party_nanopb, root_build_dir) ]
      stamp = true
    }
  }
} else {
  group("nanopb") {
  }
  pw_python_group("generate_nanopb_proto") {
  }
}