#
#  Copyright 2021 Google, Inc.
#
#  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.

# Generate bundled flat buffers
#
# Args:
#   include_dir: Path to include directory
#   sources: Flatbuffer source files
#   gen_header [optional]: Whether to generate headers.
template("bt_flatc_binary_schema") {
  action_name = "${target_name}_gen"
  action(action_name) {
    forward_variables_from(invoker,
                           [
                             "include_dir",
                             "sources",
                           ])
    assert(defined(include_dir), "include_dir must be set")
    assert(defined(sources), "sources must be set")

    gen_header = defined(invoker.gen_header) && invoker.gen_header

    script = "//common-mk/file_generator_wrapper.py"
    binfile = "flatc"
    args = [
      binfile,
      "-I",
      "${include_dir}",
      "-b",
      "--schema",
      "-o",
      "${target_gen_dir}",
    ]

    bfbs_names = []
    srclist = []
    outputs = []

    foreach(s, sources) {
      srclist += [ rebase_path(s) ]

      # bfbs get generated into ${target_gen_root} directory
      name = string_replace(get_path_info(s, "file"), ".fbs", ".bfbs")
      bfbs_names += [ "${target_gen_dir}/${name}" ]
      outputs += [ "${target_gen_dir}/${name}" ]

      # headers get generated ito subdirectories based on relative path
      if (gen_header) {
        header_name = string_replace(s, ".fbs", "_generated.h")
        outputs += [ "${target_gen_dir}/${header_name}" ]
      }
    }

    # Generate header file as well
    if (gen_header) {
      args += [ "--cpp" ]
    }

    # Actual input files at the end
    args += srclist

    metadata = {
      bfbs_outputs = bfbs_names
    }
  }

  all_dependent_config_name = "_${target_name}_all_dependent_config"
  config(all_dependent_config_name) {
    # Since each header will be generated into a subdirectory, add them to the
    # include dirs as well
    gen_dirs = []
    foreach(s, invoker.sources) {
      gen_dirs += [ get_path_info(s, "gen_dir") ]
    }

    include_dirs = [ "${target_gen_dir}" ] + gen_dirs
  }

  generated_file(target_name) {
    outputs = [ "${target_gen_dir}/${target_name}.files" ]
    output_conversion = "list lines"
    data_keys = [ "bfbs_outputs" ]

    all_dependent_configs = [ ":${all_dependent_config_name}" ]
    if (defined(invoker.all_dependent_configs)) {
      all_dependent_configs += invoker.all_dependent_configs
    }

    deps = [ ":${action_name}" ]
    if (defined(invoker.deps)) {
      deps += invoker.deps
    }

    if (defined(invoker.configs)) {
      configs += invoker.configs
    }
  }
}

# Generate bundled header
template("bt_flatc_bundler") {
  action_name = "${target_name}_gen"
  action(action_name) {
    forward_variables_from(invoker, [ "deps" ])
    assert(defined(deps), "deps must be set")
    assert(defined(invoker.root_name), "root_name must be set")
    assert(defined(invoker.filename), "filename must be set")
    assert(defined(invoker.namespace), "namespace must be set")

    files_list = []
    foreach(s, deps) {
      name = get_label_info(s, "name")
      gen_dir = get_label_info(s, "target_gen_dir")
      files_list += [ "${gen_dir}/${name}.files" ]
    }

    script = "//bt/system/gd/dumpsys/bundler/extract_files_and_call.py"
    binfile = "${root_out_dir}/bluetooth_flatbuffer_bundler"
    args = files_list
    args += [
      "--",
      binfile,
      "-w",
      "-m",
      "${invoker.root_name}",
      "-f",
      "${invoker.filename}",
      "-n",
      "${invoker.namespace}",
      "-g",
      "${target_gen_dir}",
    ]

    outputs = [
      "${target_gen_dir}/${invoker.filename}.cc",
      "${target_gen_dir}/${invoker.filename}",
    ]

    metadata = {
      all_outputs = outputs
    }
  }

  all_dependent_config_name = "_${target_name}_all_dependent_config"
  config(all_dependent_config_name) {
    include_dirs = [ "${target_gen_dir}" ]
  }

  source_set(target_name) {
    sources = [
      "${target_gen_dir}/${invoker.filename}.cc",
    ]

    public_deps = [ ":$action_name" ]

    if (defined(invoker.configs)) {
      configs += invoker.configs
    }
  }
}