# Copyright (C) 2021 The Android Open Source Project
#
# 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
#
#      http://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("perfetto.gni")

template("perfetto_cc_proto_descriptor") {
  is_target = defined(invoker.descriptor_target)
  is_path = defined(invoker.descriptor_path)

  # You must define exactly one of:
  # descriptor_target
  # descriptor_path
  assert((is_target || is_path) && !(is_target && is_path))

  config("${target_name}_config") {
    include_dirs = [ "${root_gen_dir}/${perfetto_root_path}" ]
  }

  action(target_name) {
    generated_header = "${target_gen_dir}/${invoker.descriptor_name}.h"
    if (is_target) {
      descriptor_file_path =
          get_label_info(invoker.descriptor_target, "target_gen_dir") +
          "/${invoker.descriptor_name}"
      deps = [ invoker.descriptor_target ]
    } else {
      descriptor_file_path = invoker.descriptor_path
      deps = []
    }

    script = "$perfetto_root_path/tools/gen_cc_proto_descriptor.py"
    args = [
      "--gen_dir",
      rebase_path(root_gen_dir, root_build_dir),
      "--cpp_out",
      rebase_path(generated_header, root_build_dir),
    ]
    if (defined(invoker.namespace)) {
      args += [
        "--namespace",
        invoker.namespace,
      ]
    }
    args += [
      rebase_path(descriptor_file_path, root_build_dir),
    ]
    inputs = [ descriptor_file_path ]
    outputs = [ generated_header ]
    public_configs = [ ":${target_name}_config" ]
    metadata = {
      perfetto_action_type_for_generator = [ "cc_proto_descriptor" ]
    }
  }
}