# Copyright 2020 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("$dir_pw_build/error.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_chrono/backend.gni")
import("$dir_pw_docgen/docs.gni")
import("$dir_pw_thread/backend.gni")
import("$dir_pw_unit_test/test.gni")

config("public_include_path") {
  include_dirs = [ "public" ]
  visibility = [ ":*" ]
}

config("id_public_overrides") {
  include_dirs = [ "id_public_overrides" ]
  visibility = [ ":*" ]
}

# This target provides the backend for pw::thread::Id & pw::this_thread::get_id.
pw_source_set("id") {
  public_configs = [
    ":public_include_path",
    ":id_public_overrides",
  ]
  public = [
    "id_public_overrides/pw_thread_backend/id_inline.h",
    "id_public_overrides/pw_thread_backend/id_native.h",
    "public/pw_thread_stl/id_inline.h",
    "public/pw_thread_stl/id_native.h",
  ]
  deps = [ "$dir_pw_thread:id.facade" ]
}

config("thread_public_overrides") {
  include_dirs = [ "thread_public_overrides" ]
  visibility = [ ":*" ]
}

# This target provides the backend for pw::thread::Thread with joining
# joining capability.
pw_source_set("thread") {
  public_configs = [
    ":public_include_path",
    ":thread_public_overrides",
  ]
  public = [
    "public/pw_thread_stl/options.h",
    "public/pw_thread_stl/thread_inline.h",
    "public/pw_thread_stl/thread_native.h",
    "thread_public_overrides/pw_thread_backend/thread_inline.h",
    "thread_public_overrides/pw_thread_backend/thread_native.h",
  ]
  allow_circular_includes_from = [ "$dir_pw_thread:thread.facade" ]
  deps = [ "$dir_pw_thread:thread.facade" ]
}

pw_build_assert("check_system_clock_backend") {
  condition =
      pw_thread_SLEEP_BACKEND != "$dir_pw_thread_stl:sleep" ||
      pw_chrono_SYSTEM_CLOCK_BACKEND == "" ||
      pw_chrono_SYSTEM_CLOCK_BACKEND == "$dir_pw_chrono_stl:system_clock"
  message = "The STL pw::this_thread::sleep_{for,until} backend only works " +
            "with the STL pw::chrono::SystemClock backend " +
            "(pw_chrono_SYSTEM_CLOCK_BACKEND = " +
            "\"$dir_pw_chrono_stl:system_clock\")"
}

config("sleep_public_overrides") {
  include_dirs = [ "sleep_public_overrides" ]
  visibility = [ ":*" ]
}

# This target provides the backend for pw::this_thread::sleep_{for,until}.
pw_source_set("sleep") {
  public_configs = [
    ":public_include_path",
    ":sleep_public_overrides",
  ]
  public = [
    "public/pw_thread_stl/sleep_inline.h",
    "sleep_public_overrides/pw_thread_backend/sleep_inline.h",
  ]
  deps = [
    ":check_system_clock_backend",
    "$dir_pw_chrono:system_clock",
    "$dir_pw_thread:sleep.facade",
  ]
}

config("yield_public_overrides") {
  include_dirs = [ "yield_public_overrides" ]
  visibility = [ ":*" ]
}

# This target provides the backend for pw::this_thread::yield.
pw_source_set("yield") {
  public_configs = [
    ":public_include_path",
    ":yield_public_overrides",
  ]
  public = [
    "public/pw_thread_stl/yield_inline.h",
    "yield_public_overrides/pw_thread_backend/yield_inline.h",
  ]
  deps = [ "$dir_pw_thread:yield.facade" ]
}

# This target provides a stub backend for pw::this_thread::thread_iteration.
# Iterating over child threads isn't supported by STL, so this only exists
# for portability reasons.
pw_source_set("thread_iteration") {
  deps = [
    "$dir_pw_thread:thread_iteration.facade",
    dir_pw_status,
  ]
  sources = [ "thread_iteration.cc" ]
}

pw_test_group("tests") {
  tests = [ ":thread_backend_test" ]
}

pw_source_set("test_threads") {
  public_deps = [ "$dir_pw_thread:test_threads" ]
  sources = [ "test_threads.cc" ]
  deps = [ "$dir_pw_thread:thread" ]
}

pw_test("thread_backend_test") {
  enable_if = pw_thread_THREAD_BACKEND == "$dir_pw_thread_stl:thread" &&
              pw_thread_SLEEP_BACKEND != ""
  deps = [
    ":test_threads",
    "$dir_pw_thread:thread_facade_test",
  ]
}

pw_doc_group("docs") {
  sources = [ "docs.rst" ]
}