# 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("$dir_pw_bloat/bloat.gni")
import("$dir_pw_build/module_config.gni")
import("$dir_pw_build/target_types.gni")
import("$dir_pw_docgen/docs.gni")
import("$dir_pw_perf_test/perf_test.gni")
import("$dir_pw_unit_test/test.gni")

declare_args() {
  # The build target that overrides the default configuration options for this
  # module. This should point to a source set that provides defines through a
  # public config (which may -include a file or add defines directly).
  pw_checksum_CONFIG = pw_build_DEFAULT_MODULE_CONFIG
}

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

pw_source_set("config") {
  sources = [ "public/pw_checksum/internal/config.h" ]
  public_configs = [ ":public_include_path" ]
  public_deps = [ pw_checksum_CONFIG ]
  visibility = [ ":*" ]  # Only allow this module to depend on ":config"
  friend = [ ":*" ]  # Allow this module to access the config.h header.
}

pw_source_set("pw_checksum") {
  public_configs = [ ":public_include_path" ]
  public = [
    "public/pw_checksum/crc16_ccitt.h",
    "public/pw_checksum/crc32.h",
  ]
  sources = [
    "crc16_ccitt.cc",
    "crc32.cc",
  ]
  public_deps = [
    ":config",
    dir_pw_bytes,
    dir_pw_span,
  ]

  # TODO: b/259746255 - Remove this when everything compiles with -Wconversion.
  configs = [ "$dir_pw_build:conversion_warnings" ]
}

pw_test_group("tests") {
  tests = [
    ":crc16_ccitt_test",
    ":crc32_test",
  ]
}

pw_test("crc16_ccitt_test") {
  deps = [
    ":pw_checksum",
    dir_pw_bytes,
  ]
  sources = [
    "crc16_ccitt_test.cc",
    "crc16_ccitt_test_c.c",
  ]

  # TODO: b/259746255 - Remove this when everything compiles with -Wconversion.
  configs = [ "$dir_pw_build:conversion_warnings" ]
}

pw_test("crc32_test") {
  deps = [
    ":pw_checksum",
    dir_pw_bytes,
  ]
  sources = [
    "crc32_test.cc",
    "crc32_test_c.c",
  ]

  # TODO: b/259746255 - Remove this when everything compiles with -Wconversion.
  configs = [ "$dir_pw_build:conversion_warnings" ]
}

pw_perf_test("crc32_perf_tests") {
  enable_if = pw_perf_test_TIMER_INTERFACE_BACKEND != ""
  deps = [
    ":pw_checksum",
    dir_pw_bytes,
  ]
  sources = [ "crc32_perf_test.cc" ]
}

pw_perf_test("crc16_perf_tests") {
  enable_if = pw_perf_test_TIMER_INTERFACE_BACKEND != ""
  deps = [
    ":pw_checksum",
    dir_pw_bytes,
  ]
  sources = [ "crc16_ccitt_perf_test.cc" ]
}

group("perf_tests") {
  deps = [
    ":crc16_perf_tests",
    ":crc32_perf_tests",
  ]
}

pw_size_diff("size_report") {
  title = "Checksum sizes"

  binaries = [
    {
      target = "size_report:crc16_checksum"
      base = "size_report:noop_checksum"
      label = "CRC16 with 256-entry table"
    },
    {
      target = "size_report:crc32_8bit_checksum"
      base = "size_report:noop_checksum"
      label = "CRC32: 8 bits per iteration, 256-entry table"
    },
    {
      target = "size_report:crc32_4bit_checksum"
      base = "size_report:noop_checksum"
      label = "CRC32: 4 bits per iteration, 16-entry table"
    },
    {
      target = "size_report:crc32_1bit_checksum"
      base = "size_report:noop_checksum"
      label = "CRC32: 1 bit per iteration, no table"
    },
    {
      target = "size_report:fletcher16_checksum"
      base = "size_report:noop_checksum"
      label = "Fletcher16 (illustrative only)"
    },
  ]
}

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