class Aws::Endpoints::Function

def build_argv(argv_json)
  argv_json.each.with_object([]) do |arg, argv|
    argv << if arg.is_a?(Hash) && arg['ref']
              Reference.new(ref: arg['ref'])
            elsif arg.is_a?(Hash) && arg['fn']
              Function.new(fn: arg['fn'], argv: arg['argv'])
            else
              arg
            end
  end
end

def call(parameters, assigns)
  args = []
  @argv.each do |arg|
    if arg.is_a?(Reference)
      args << arg.resolve(parameters, assigns)
    elsif arg.is_a?(Function)
      args << arg.call(parameters, assigns)
    else
      if arg.is_a?(String)
        arg = Templater.resolve(arg, parameters, assigns)
      end
      args << arg
    end
  end
  case @fn
  when 'isSet'
    Matchers.set?(*args)
  when 'not'
    Matchers.not(*args)
  when 'getAttr'
    Matchers.attr(*args)
  when 'substring'
    Matchers.substring(*args)
  when 'stringEquals'
    Matchers.string_equals?(*args)
  when 'booleanEquals'
    Matchers.boolean_equals?(*args)
  when 'uriEncode'
    Matchers.uri_encode(*args)
  when 'parseURL'
    Matchers.parse_url(*args)
  when 'isValidHostLabel'
    Matchers.valid_host_label?(*args)
  when 'aws.partition'
    Matchers.aws_partition(*args)
  when 'aws.parseArn'
    Matchers.aws_parse_arn(*args)
  when 'aws.isVirtualHostableS3Bucket'
    Matchers.aws_virtual_hostable_s3_bucket?(*args)
  else
    raise "Function not found: #{@fn}"
  end
end

def initialize(fn:, argv:)
  @fn = fn
  @argv = build_argv(argv)
end