class Standard::LoadsYamlConfig

def arrayify(object)
  if object.nil?
    []
  elsif object.respond_to?(:to_ary)
    object.to_ary || [object]
  else
    [object]
  end
end

def call(standard_yaml_path, todo_yaml_path)
  standard_yaml = load_standard_yaml(standard_yaml_path)
  todo_yaml = load_standard_yaml(todo_yaml_path)
  construct_config(standard_yaml_path, standard_yaml, todo_yaml_path, todo_yaml)
end

def construct_config(yaml_path, standard_yaml, todo_path, todo_yaml)
  {
    ruby_version: normalized_ruby_version(standard_yaml["ruby_version"]),
    fix: !!standard_yaml["fix"],
    format: standard_yaml["format"],
    parallel: !!standard_yaml["parallel"],
    ignore: expand_ignore_config(standard_yaml["ignore"]) + expand_ignore_config(todo_yaml["ignore"]),
    default_ignores: standard_yaml.key?("default_ignores") ? !!standard_yaml["default_ignores"] : true,
    config_root: yaml_path ? Pathname.new(yaml_path).dirname.to_s : nil,
    todo_file: todo_path,
    todo_ignore_files: Array(todo_yaml["ignore"]).map { |f| (Hash === f) ? f.keys.first : f },
    plugins: Array(standard_yaml["plugins"]),
    extend_config: Array(standard_yaml["extend_config"])
  }
end

def expand_ignore_config(ignore_config)
  arrayify(ignore_config).map { |rule|
    if rule.is_a?(String)
      [rule, ["AllCops"]]
    elsif rule.is_a?(Hash)
      rule.entries.first
    end
  }
end

def load_standard_yaml(yaml_path)
  if yaml_path
    YAML.load_file(yaml_path) || {}
  else
    {}
  end
end

def normalized_ruby_version(version)
  return version if version && !Gem::Version.correct?(version)
  Gem::Version.new(version || RUBY_VERSION)
end