# Copyright 2021 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/config.gni")

# Provides the IANA time zone database files to the given package.
#
# The files will be made available in the namespace of the target component(s)
# namespace `/config/data/tzdata/zoneinfo/tzif2`.
# Users of cctz should set the TZDIR environment variable to this path.
#
# There will also be a file at `/config/data/tzdata/revision.txt` containing the
# time zone database revision ID, e.g. `2019c`.
#
# Options:
# - `for_pkg` (required)
#   [string] The name of the package to which time zone files will be supplied
#
# - `tzif_version` (optional)
#   [string] The version number of the TZif format.
#   Currently supported: { `"2"` }
#   Default: `"2"`
#
# Example:
#
# ```
# zone_info_config_data("zoneinfo-for-cctz-tests") {
#   for_pkg = "cctz-tests"
# }
# ```
#
template("zoneinfo_config_data") {
  tzif_version = "2"
  if (defined(invoker.tzif_version)) {
    tzif_version = invoker.tzif_version
  }
  assert(tzif_version == "2", "Unsupported TZif version")

  version_name = "tzif${tzif_version}"

  sub_targets = []

  directory_list =
      read_file("//prebuilt/third_party/zoneinfo/${version_name}_files.json",
                "json")

  # config_data() does not allow generating multiple output directories, so
  # we create one config_data target per directory, e.g.
  # ```
  # config_data("_zoneinfo_config_data_for_my_pkg_dir_Antarctica") {
  #   ...
  #   outputs = [ "tzdata/zoneinfo/tzif2/Antarctica/{{source_file_part}}" ]
  # }
  # ```
  foreach(entry, directory_list) {
    directory = entry.directory
    target_suffix = string_replace(directory, "/", "_")
    target_label = "_${target_name}_dir_${target_suffix}"
    sub_targets += [ ":${target_label}" ]

    config_data(target_label) {
      forward_variables_from(invoker,
                             [
                               "for_pkg",
                               "testonly",
                             ])

      source_path = "//prebuilt/third_party/zoneinfo/${version_name}"
      if (directory != "") {
        source_path = "${source_path}/${directory}"
      }
      sources = []
      foreach(file_name, entry.file_names) {
        sources += [ "${source_path}/${file_name}" ]
      }

      output_path = "tzdata/zoneinfo/${version_name}"
      if (directory != "") {
        output_path = "${output_path}/${directory}"
      }
      outputs = [ "${output_path}/{{source_file_part}}" ]
    }
  }  # /foreach

  revision_target_label = "_${target_name}_revision_txt"
  sub_targets += [ ":${revision_target_label}" ]
  config_data(revision_target_label) {
    forward_variables_from(invoker,
                           [
                             "for_pkg",
                             "testonly",
                           ])
    sources = [ "//prebuilt/third_party/zoneinfo/version.txt" ]
    outputs = [ "tzdata/revision.txt" ]
  }

  group(target_name) {
    forward_variables_from(invoker,
                           [
                             "testonly",
                             "visibility",
                           ])
    deps = sub_targets
  }
}