# Copyright 2013 The Flutter 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/fuchsia/config.gni")
import("//build/toolchain/toolchain.gni")

declare_args() {
  # The path to where GN targets derived from the Fuchsia SDK are instantiated.
  fuchsia_sdk_root = "//build/fuchsia"

  # The Flutter buildroot is outside the Fuchsia root and can only use the SDK.
  using_fuchsia_sdk = true

  # This is set by the dart sources. Once the engine repo switches to using the GN SDK,
  # this flag can be unified with `using_fuchsia_sdk`.
  using_fuchsia_gn_sdk = false

  # The following variables are Flutter buildroot specific.
  fuchsia_sdk_path = "//fuchsia/sdk/$host_os"
  fuchsia_toolchain_path = "$buildtools_path/${host_os}-${host_cpu}/clang"
}

declare_args() {
  # The Skia buildroot uses this flag to decide if it should be using the
  # Fuchsia SDK to build its translation units.
  skia_using_fuchsia_sdk = using_fuchsia_sdk
}

_fuchsia_sdk_path = "//fuchsia/sdk/$host_os"
_fuchsia_tools_path = "${_fuchsia_sdk_path}/tools/${host_cpu}"

template("_fuchsia_sysroot") {
  assert(defined(invoker.meta), "The meta.json file path must be specified.")
  assert(target_cpu == "x64" || target_cpu == "arm64",
         "We currently only support 'x64' and 'arm64' targets for fuchsia.")

  meta_json = read_file(invoker.meta, "json")

  assert(meta_json.type == "sysroot")

  meta_json_versions = meta_json.versions
  if (target_cpu == "x64") {
    defs = meta_json_versions.x64
  } else {
    defs = meta_json_versions.arm64
  }

  _libs = []
  _lib_dirs = []
  _include_dirs = []

  foreach(link_lib, defs.link_libs) {
    if (link_lib != "arch/${target_cpu}/sysroot/lib/Scrt1.o") {
      _libs += [ "$_fuchsia_sdk_path/$link_lib" ]
    }
  }

  defs_include_dir = defs.include_dir
  _include_dirs += [ "$_fuchsia_sdk_path/$defs_include_dir" ]

  config_name = "config_$target_name"
  config(config_name) {
    lib_dirs = _lib_dirs
    libs = _libs
    include_dirs = _include_dirs
  }

  group(target_name) {
    public_configs = [ ":$config_name" ]
  }
}

template("fuchsia_fidl_library") {
  assert(defined(invoker.meta), "The meta.json file path must be specified.")
  assert(target_cpu == "x64" || target_cpu == "arm64",
         "We currently only support 'x64' and 'arm64' targets for fuchsia.")

  meta_json = read_file(invoker.meta, "json")
  assert(meta_json.type == "fidl_library")

  _deps = [
    "//build/fuchsia/pkg:fidl_cpp",
    "//build/fuchsia/pkg:fidl_cpp_hlcpp_conversion",
    "//build/fuchsia/pkg:fidl_cpp_natural_ostream",
    "//build/fuchsia/pkg:fidl_cpp_v2",
    "//build/fuchsia/pkg:fidl_cpp_wire",
  ]

  library_name = meta_json.name
  library_name_json = "${meta_json.name}.json"

  foreach(dep, meta_json.deps) {
    # TODO(https://fxbug.dev/42172334): Make zx less special.
    if (dep != "zx") {
      _deps += [ ":$dep" ]
    }
  }

  config_name = "config_$target_name"
  config(config_name) {
    include_dirs = [ target_gen_dir ]
  }

  fidl_gen_target_name = "fidlgen_$target_name"
  action(fidl_gen_target_name) {
    script = "//build/fuchsia/fidl_gen_cpp.py"

    library_name_slashes = string_replace(library_name, ".", "/")

    inputs = [ invoker.meta ]

    args = [
      "--fidlc-bin",
      rebase_path("${_fuchsia_tools_path}/fidlc"),
      "--sdk-base",
      rebase_path(_fuchsia_sdk_path),
      "--root",
      rebase_path(invoker.meta),
      "--json",
      rebase_path("$target_gen_dir/$library_name_json"),
    ]

    if (fuchsia_target_api_level != -1) {
      args += [
        "--target-api-level",
        "${fuchsia_target_api_level}",
      ]
    }

    outputs = [
      "$target_gen_dir/$library_name_slashes/cpp/fidl.cc",
      "$target_gen_dir/$library_name_slashes/cpp/fidl.h",
      "$target_gen_dir/$library_name_slashes/cpp/fidl_test_base.h",
      "$target_gen_dir/$library_name_slashes/cpp/tables.c",

      "$target_gen_dir/fidl/$library_name/cpp/common_types.cc",
      "$target_gen_dir/fidl/$library_name/cpp/common_types.h",
      "$target_gen_dir/fidl/$library_name/cpp/fidl.h",
      "$target_gen_dir/fidl/$library_name/cpp/hlcpp_conversion.h",
      "$target_gen_dir/fidl/$library_name/cpp/markers.h",
      "$target_gen_dir/fidl/$library_name/cpp/natural_messaging.cc",
      "$target_gen_dir/fidl/$library_name/cpp/natural_messaging.h",
      "$target_gen_dir/fidl/$library_name/cpp/natural_ostream.cc",
      "$target_gen_dir/fidl/$library_name/cpp/natural_ostream.h",
      "$target_gen_dir/fidl/$library_name/cpp/natural_types.cc",
      "$target_gen_dir/fidl/$library_name/cpp/natural_types.h",
      "$target_gen_dir/fidl/$library_name/cpp/type_conversions.cc",
      "$target_gen_dir/fidl/$library_name/cpp/type_conversions.h",
      "$target_gen_dir/fidl/$library_name/cpp/wire.h",
      "$target_gen_dir/fidl/$library_name/cpp/wire_messaging.cc",
      "$target_gen_dir/fidl/$library_name/cpp/wire_messaging.h",
      "$target_gen_dir/fidl/$library_name/cpp/wire_test_base.h",
      "$target_gen_dir/fidl/$library_name/cpp/wire_types.cc",
      "$target_gen_dir/fidl/$library_name/cpp/wire_types.h",
    ]

    args += [
      "--fidlgen-bin",
      rebase_path("${_fuchsia_tools_path}/fidlgen_cpp"),
      "--fidlgen-bin",
      rebase_path("${_fuchsia_tools_path}/fidlgen_hlcpp"),
      "--fidlgen-output-root",
      rebase_path("$target_gen_dir"),
    ]
  }

  source_set(target_name) {
    public_configs = [ ":$config_name" ]

    sources = get_target_outputs(":$fidl_gen_target_name")

    deps = [ ":$fidl_gen_target_name" ]

    public_deps = _deps
  }
}

template("_fuchsia_cc_source_library") {
  assert(defined(invoker.meta), "The meta.json file path must be specified.")

  meta_json = read_file(invoker.meta, "json")

  assert(meta_json.type == "cc_source_library")

  _output_name = meta_json.name
  _include_dirs = []
  _public_headers = []
  _sources = []
  _deps = []

  meta_json_include_dir = meta_json.include_dir
  _include_dirs += [ "$_fuchsia_sdk_path/$meta_json_include_dir" ]

  foreach(header, meta_json.headers) {
    rebased_header = []
    rebased_header = [ "$_fuchsia_sdk_path/$header" ]
    _public_headers += rebased_header
    _sources += rebased_header
  }

  foreach(source, meta_json.sources) {
    _sources += [ "$_fuchsia_sdk_path/$source" ]
  }

  config_name = "config_$target_name"
  config(config_name) {
    include_dirs = _include_dirs
  }

  foreach(dep, meta_json.deps) {
    _deps += [ "../pkg:$dep" ]
  }

  foreach(dep, meta_json.fidl_deps) {
    _deps += [ "../fidl:$dep" ]
  }

  foreach(binding_dep, meta_json.fidl_binding_deps) {
    # No need to check "binding_deps.binding_type" because we always
    # generate both hlcpp and natural bindings.
    foreach(dep, binding_dep.deps) {
      _deps += [ "../fidl:$dep" ]
    }
  }

  source_set(target_name) {
    output_name = _output_name
    public = _public_headers
    sources = _sources
    public_configs = [ ":$config_name" ]
    public_deps = _deps
  }
}

template("_fuchsia_cc_prebuilt_library") {
  assert(defined(invoker.meta), "The meta.json file path must be specified.")
  meta_json = read_file(invoker.meta, "json")

  _include_dirs = []
  _deps = []
  _libs = []

  meta_json_include_dir = meta_json.include_dir
  _include_dirs += [ "$_fuchsia_sdk_path/$meta_json_include_dir" ]

  foreach(dep, meta_json.deps) {
    _deps += [ ":$dep" ]
  }

  meta_json_binaries = meta_json.binaries
  if (target_cpu == "x64") {
    meta_json_binaries_arch = meta_json_binaries.x64
  } else {
    meta_json_binaries_arch = meta_json_binaries.arm64
  }
  prebuilt_lib = meta_json_binaries_arch.link
  _libs = [ "$_fuchsia_sdk_path/$prebuilt_lib" ]

  config_name = "config_$target_name"
  config(config_name) {
    include_dirs = _include_dirs
    libs = _libs
  }

  group(target_name) {
    public_configs = [ ":$config_name" ]
    public_deps = _deps
  }
}

template("fuchsia_sdk") {
  assert(defined(invoker.meta), "The meta.json file path must be specified.")
  assert(defined(invoker.enabled_parts),
         "A list containing the parts of the SDK to generate targets for.")

  meta_json = read_file(invoker.meta, "json")

  foreach(part, meta_json.parts) {
    part_meta_json = {
    }
    part_meta = part.meta
    part_meta_rebased = "$_fuchsia_sdk_path/$part_meta"

    # Check if the part is using `part.element_type` or `part.type`.
    part_type = ""
    if (defined(part.element_type)) {
      part_type = part.element_type
    } else if (defined(part.type)) {
      part_type = part.type
    }

    # Check if the part type is in `invoker.enabled_parts`.
    if (invoker.enabled_parts + [ part_type ] - [ part_type ] !=
        invoker.enabled_parts) {
      part_meta_json = read_file(part_meta_rebased, "json")
      subtarget_name = part_meta_json.name

      if (part_type == "cc_source_library") {
        _fuchsia_cc_source_library(subtarget_name) {
          meta = part_meta_rebased
        }
      } else if (part_type == "sysroot") {
        _fuchsia_sysroot(subtarget_name) {
          meta = part_meta_rebased
        }
      } else if (part_type == "fidl_library") {
        # TODO(https://fxbug.dev/42172334): Make zx less special.
        if (subtarget_name != "zx") {
          fuchsia_fidl_library(subtarget_name) {
            meta = part_meta_rebased
          }
        }
      } else if (part_type == "cc_prebuilt_library") {
        _fuchsia_cc_prebuilt_library(subtarget_name) {
          meta = part_meta_rebased
        }
      }
    }
  }

  group(target_name) {
  }
}

template("fuchsia_repo") {
  assert(defined(invoker.archives),
         "The list of archives to publish must be specified.")
  assert(defined(invoker.repo), "The location of the repo should be specified.")

  action(target_name) {
    script = "//flutter/tools/fuchsia/gen_repo.py"

    pm_binary = rebase_path("${_fuchsia_tools_path}/pm")
    repo_directory = invoker.repo

    inputs = [ pm_binary ]

    archive_flags = []

    foreach(archive, invoker.archives) {
      assert(get_path_info(archive, "extension") == "far",
             "Archive '$archive' does not have the .far extension.")
      inputs += [ archive ]
      archive_flags += [
        "--archive",
        rebase_path(archive),
      ]
    }

    outputs = [ repo_directory ]

    args = [
             "--pm-bin",
             pm_binary,
             "--repo-dir",
             rebase_path(repo_directory),
           ] + archive_flags

    if (defined(invoker.deps)) {
      deps = invoker.deps
    }
  }
}