# Copyright 2018 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.

# Runs the Cobalt registry parser on either the entire (global) registry or
# the registry for a single project. Generates a .pb file containing the
# registry.
#
# Args:
#   global: (default: false) Should generate the global config.
#   customer_id: (default: 1) Override the customer for the config.
#   project_id: numeric project_id of the project to generate the config of
#   output_name: base of the filename for the output
#   generate_binarypb: (default: true) should we generate a *.pb file with a
#                      binary representation of the config.
#   generate_cc: (default: false) Should we generate a *.cb.h file and a library.
#   generate_dart: (default: false) Should we generate a dart library.
#   generate_rust: (default: false) Should we generate a rust crate.
#   v1_project: (default: true) Is this a v1 project.
#   directories: (default: [//third_party/cobalt_config]) The directories to parse.
#
# Note: Other args are forwarded to dart_library when generate_dart is true.
#
# example usage:
#
# metrics_registry("generate_testapp_config") {
#   project_id = 2
# }

import("//build/config/clang/clang.gni")

template("metrics_registry") {
  if (defined(invoker.global)) {
    global = invoker.global
  } else {
    global = false
  }

  if (defined(invoker.customer_id)) {
    not_needed([ "global" ])
    customer_id = invoker.customer_id
  } else if (!global) {
    # Customer is Fuchsia
    customer_id = 1
  }

  if (defined(invoker.project_id)) {
    not_needed([ "global" ])
    project_id = invoker.project_id
  } else {
    assert(global, "Exactly one of 'project_id' or 'global' must be defined")
  }

  if (defined(invoker.namespace)) {
    namespace = invoker.namespace
  } else {
    namespace = ""
  }

  if (defined(invoker.generate_binarypb)) {
    generate_binarypb = invoker.generate_binarypb
  } else {
    generate_binarypb = true
  }

  if (defined(invoker.generate_cc)) {
    generate_cc = invoker.generate_cc
  } else {
    generate_cc = false
  }

  if (defined(invoker.generate_dart)) {
    generate_dart = invoker.generate_dart
  } else {
    generate_dart = false
  }

  if (defined(invoker.generate_go)) {
    generate_go = invoker.generate_go
  } else {
    generate_go = false
  }

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

  if (defined(invoker.generate_rust)) {
    generate_rust = invoker.generate_rust
  } else {
    generate_rust = false
  }

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

  if (defined(invoker.skip_validation)) {
    skip_validation = invoker.skip_validation
  } else {
    skip_validation = false
  }

  if (defined(invoker.for_testing)) {
    for_testing = invoker.for_testing
  } else {
    for_testing = false
  }

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

  if (defined(invoker.v1_project)) {
    v1_project = invoker.v1_project
  } else {
    v1_project = true
  }

  if (defined(invoker.use_target_name)) {
    not_needed(invoker, [ "use_target_name" ])
  }

  if (defined(invoker.output_name)) {
    output_name = invoker.output_name
  } else {
    output_name = target_name
  }

  if (defined(invoker.directories)) {
    cobalt_config_dirs = invoker.directories
  } else {
    cobalt_config_dirs = [ "//third_party/cobalt_config" ]
  }

  out_format = ""
  generated_files = []
  if (generate_binarypb) {
    out_format = "${out_format}bin "
    generated_files += [ "$target_gen_dir/$output_name.pb" ]
  }
  if (generate_cc) {
    out_format = "${out_format}cpp "
    cc_source_file = "$target_gen_dir/$output_name.cb.h"
    generated_files += [ cc_source_file ]
  }
  if (generate_dart) {
    out_format = "${out_format}dart "
    dart_out_dir = "$target_gen_dir/${target_name}_package"
    dart_src_dir = "$dart_out_dir/lib"
    dart_library_name = target_name
    dart_source_file = "$dart_src_dir/$output_name.dart"
    generated_files += [ dart_source_file ]
  }
  if (generate_rust) {
    out_format = "${out_format}rust "
    rust_source_file = "$target_gen_dir/$output_name.rs"
    generated_files += [ rust_source_file ]
  }
  if (generate_go) {
    out_format = "${out_format}go "
    go_source_file = "$target_gen_dir/$output_name.go"
    generated_files += [ go_source_file ]
  }

  gen_target_name = "${target_name}_gen"
  group_deps = [ ":${gen_target_name}" ]

  action(gen_target_name) {
    config_parser_target =
        "$cobalt_root/src/bin/config_parser/src:bin($host_toolchain)"
    config_parser_bin =
        get_label_info(config_parser_target, "root_out_dir") + "/config_parser"

    depfile = "$target_gen_dir/$output_name.d"
    outputs = generated_files
    inputs = []
    foreach(config_dir, cobalt_config_dirs) {
      inputs += [ "$config_dir/projects.yaml" ]
    }

    script = "//build/gn_run_binary.sh"
    args = [
      clang_prefix,
      rebase_path(config_parser_bin, root_build_dir),
      "-out_format",
      "$out_format",
      "-out_filename",
      "$output_name",
      "-out_dir",
      rebase_path(target_gen_dir, root_build_dir),
      "-for_client",
      "-dep_file",
      rebase_path(depfile, root_build_dir),
    ]

    if (skip_validation) {
      args += [ "-skip_validation" ]
    }

    if (for_testing) {
      args += [ "-for_testing" ]
    }

    if (defined(var_name)) {
      args += [
        "-var_name",
        var_name,
      ]
    }

    if (defined(source)) {
      args += [
        "-config_file",
        rebase_path(source, root_build_dir),
      ]
      if (v1_project) {
        args += [ "-v1_project" ]
      }
    } else {
      not_needed([ "v1_project" ])

      foreach(config_dir, cobalt_config_dirs) {
        args += [
          "-config_dir",
          rebase_path(config_dir, root_build_dir),
        ]
      }
    }

    if (defined(customer_id)) {
      args += [
        "-customer_id",
        "$customer_id",
      ]
    }

    if (namespace != "") {
      args += [
        "-namespace",
        "${namespace}",
      ]
    }

    if (defined(project_id)) {
      args += [
        "-project_id",
        "$project_id",
      ]
    }

    if (generate_dart) {
      args += [
        "-dart_out_dir",
        rebase_path(dart_src_dir, root_build_dir),
      ]
    }

    if (generate_go) {
      args += [
        "-go_package",
        go_package_name,
      ]
    }

    deps = [
      config_parser_target,
    ]
  }

  if (generate_cc) {
    cclib = "${target_name}_cc"
    group_deps += [ ":${cclib}" ]

    source_set(cclib) {
      output_name = cclib

      sources = [
        cc_source_file,
      ]

      public_deps = [
        ":$gen_target_name",
      ]
    }
  }

  if (generate_dart) {
    import("//build/dart/dart_library.gni")

    dartlib = "${target_name}_dartlib"
    group_deps += [ ":${dartlib}" ]

    copy_pubspec_target_name = "${dartlib}_copy_pubspec"
    copy_options_target_name = "${dartlib}_copy_options"

    copy(copy_pubspec_target_name) {
      sources = [
        "//build/dart/empty_pubspec.yaml",
      ]

      outputs = [
        "$dart_out_dir/pubspec.yaml",
      ]
    }

    copy(copy_options_target_name) {
      sources = [
        "//topaz/tools/analysis_options.yaml",
      ]

      outputs = [
        "$dart_out_dir/analysis_options.yaml",
      ]
    }

    dart_library(dartlib) {
      forward_variables_from(invoker,
                             [
                               "testonly",
                               "sdk_category",
                               "visibility",
                             ])

      package_root = dart_out_dir

      package_name = dart_library_name

      sources = [
        rebase_path(dart_source_file, dart_src_dir),
      ]

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

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

      non_dart_deps = [
        ":$copy_options_target_name",
        ":$copy_pubspec_target_name",
        ":$gen_target_name",
      ]
    }
  }

  if (generate_rust) {
    import("//build/rust/rustc_library.gni")

    rust_library_name = target_name
    rustlib = "${target_name}_rustlib"
    group_deps += [ ":${rustlib}" ]
    rustc_library(rustlib) {
      name = rust_library_name

      version = "1.0.0"
      edition = "2018"
      source_root = rust_source_file

      deps = [
        "$cobalt_root/src/lib/client/rust:cobalt-client",
      ]

      non_rust_deps = [ ":$gen_target_name" ]
    }
  }

  if (generate_go) {
    import("//build/go/go_library.gni")

    source_dir = target_gen_dir
    go_library("${target_name}_golib") {
      non_go_deps = [ ":$gen_target_name" ]
    }
  }

  group(target_name) {
    forward_variables_from(invoker, [ "testonly" ])
    public_deps = group_deps
  }
}