# Copyright 2022 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//build/fidl/fidl_summary.gni")
import("//build/fidl/fidlc.gni")
import("//build/testing/config.gni")

template("fidl_api_compatibility_test") {
  assert(defined(invoker.fidl_target_name), "fidl_target_name is required")
  assert(defined(invoker.target_api_level), "target_api_level is required")
  assert(defined(invoker.golden_summary_json),
         "golden_summary_json is required")

  policy = "no_breaking_changes"
  if (defined(invoker.policy)) {
    policy = invoker.policy
  }

  # Let command-line build args override values from target declarations.
  if (bless_goldens) {
    policy = "update_golden"
  }

  target_api_level = invoker.target_api_level
  fidlc_target_name = "${target_name}_fidlc"
  json_representation = "$target_gen_dir/$target_name.fidl.json"

  # Recompile the library at the target API level.
  fidlc(fidlc_target_name) {
    forward_variables_from(invoker,
                           [
                             "deps",
                             "fidl_deps",
                             "fidl_target_name",
                             "library_name",
                             "public_deps",
                             "sources",
                             "testonly",
                           ])

    target_api_platform = "fuchsia"
    target_api_level = "$target_api_level"

    # Avoid clobbering the generated FIDL sources from HEAD.
    gen_dir = "$target_gen_dir/$target_api_level"
    json_representation = json_representation
  }

  # Generate a new JSON summary to diff against the golden one.
  summary_file_json = "$target_gen_dir/$target_name.api_summary.json"
  summarization_target_name = "${target_name}_summary_json"
  fidl_summary_json(summarization_target_name) {
    forward_variables_from(invoker, [ "testonly" ])
    visibility = [ ":*" ]
    inputs = [ json_representation ]
    outputs = [ summary_file_json ]
    dest = "fidl"
    deps = [ ":$fidlc_target_name" ]
  }

  # Run the test.
  action(target_name) {
    forward_variables_from(invoker, "*", [ "policy" ])

    script = "//sdk/cts/build/scripts/fidl_api_compatibility_test.py"
    stamp_file = "$target_gen_dir/$target_name.verified"

    current_summary = summary_file_json
    golden_summary = golden_summary_json

    inputs = [
      current_summary,
      golden_summary,
      "//sdk/cts/build/scripts/plasa_differ.py",
    ]

    outputs = [ stamp_file ]

    args = [
      "--api-level",
      "$target_api_level",
      "--golden",
      rebase_path(golden_summary, root_build_dir),
      "--current",
      rebase_path(current_summary, root_build_dir),
      "--stamp",
      rebase_path(stamp_file, root_build_dir),
      "--fidl_api_diff_path",
      rebase_path("$root_build_dir/host_x64/fidl_api_diff", root_build_dir),
      "--policy",
      policy,
    ]

    deps += [
      ":$summarization_target_name",
      "//tools/fidl/fidl_api_diff:host",
    ]
  }
}