class Aws::S3::MultipartUploadPart

def bucket_name
  @bucket_name
end

def client
  @client
end

def copy_from(options = {})
  options = options.merge(
    bucket: @bucket_name,
    key: @object_key,
    upload_id: @multipart_upload_id,
    part_number: @part_number
  )
  resp = @client.upload_part_copy(options)
  resp.data
end

def data
  load unless @data
  @data
end

def data_loaded?
  !!@data
end

def etag
  data[:etag]
end

def extract_bucket_name(args, options)
  value = args[0] || options.delete(:bucket_name)
  case value
  when String then value
  when nil then raise ArgumentError, "missing required option :bucket_name"
  else
    msg = "expected :bucket_name to be a String, got #{value.class}"
    raise ArgumentError, msg
  end
end

def extract_multipart_upload_id(args, options)
  value = args[2] || options.delete(:multipart_upload_id)
  case value
  when String then value
  when nil then raise ArgumentError, "missing required option :multipart_upload_id"
  else
    msg = "expected :multipart_upload_id to be a String, got #{value.class}"
    raise ArgumentError, msg
  end
end

def extract_object_key(args, options)
  value = args[1] || options.delete(:object_key)
  case value
  when String then value
  when nil then raise ArgumentError, "missing required option :object_key"
  else
    msg = "expected :object_key to be a String, got #{value.class}"
    raise ArgumentError, msg
  end
end

def extract_part_number(args, options)
  value = args[3] || options.delete(:part_number)
  case value
  when Integer then value
  when nil then raise ArgumentError, "missing required option :part_number"
  else
    msg = "expected :part_number to be a Integer, got #{value.class}"
    raise ArgumentError, msg
  end
end

def identifiers
  {
    bucket_name: @bucket_name,
    object_key: @object_key,
    multipart_upload_id: @multipart_upload_id,
    part_number: @part_number
  }
end

def initialize(*args)
  options = Hash === args.last ? args.pop.dup : {}
  @bucket_name = extract_bucket_name(args, options)
  @object_key = extract_object_key(args, options)
  @multipart_upload_id = extract_multipart_upload_id(args, options)
  @part_number = extract_part_number(args, options)
  @data = options.delete(:data)
  @client = options.delete(:client) || Client.new(options)
  @waiter_block_warned = false
end

def last_modified
  data[:last_modified]
end

def load
  msg = "#load is not implemented, data only available via enumeration"
  raise NotImplementedError, msg
end

def multipart_upload
  MultipartUpload.new(
    bucket_name: @bucket_name,
    object_key: @object_key,
    id: @multipart_upload_id,
    client: @client
  )
end

def multipart_upload_id
  @multipart_upload_id
end

def object_key
  @object_key
end

def part_number
  @part_number
end

def size
  data[:size]
end

def upload(options = {})
  options = options.merge(
    bucket: @bucket_name,
    key: @object_key,
    upload_id: @multipart_upload_id,
    part_number: @part_number
  )
  resp = @client.upload_part(options)
  resp.data
end

def wait_until(options = {}, &block)
  self_copy = self.dup
  attempts = 0
  options[:max_attempts] = 10 unless options.key?(:max_attempts)
  options[:delay] ||= 10
  options[:poller] = Proc.new do
    attempts += 1
    if block.call(self_copy)
      [:success, self_copy]
    else
      self_copy.reload unless attempts == options[:max_attempts]
      :retry
    end
  end
  Aws::Waiters::Waiter.new(options).wait({})
end