class HTTP::Response

def chunked?
  return false unless @headers.include?(Headers::TRANSFER_ENCODING)
  encoding = @headers.get(Headers::TRANSFER_ENCODING)
  # TODO: "chunked" is frozen in the request writer. How about making it accessible?
  encoding.last == "chunked"
end

def content_length
  # http://greenbytes.de/tech/webdav/rfc7230.html#rfc.section.3.3.3
  # Clause 3: "If a message is received with both a Transfer-Encoding
  # and a Content-Length header field, the Transfer-Encoding overrides the Content-Length.
  return nil if @headers.include?(Headers::TRANSFER_ENCODING)
  value = @headers[Headers::CONTENT_LENGTH]
  return nil unless value
  begin
    Integer(value)
  rescue ArgumentError
    nil
  end
end

def content_type
  @content_type ||= ContentType.parse headers[Headers::CONTENT_TYPE]
end

def cookies
  @cookies ||= headers.each_with_object CookieJar.new do |(k, v), jar|
    jar.parse(v, uri) if k == Headers::SET_COOKIE
  end
end

def flush
  body.to_s
  self
end

def initialize(opts)
  @version       = opts.fetch(:version)
  @uri           = HTTP::URI.parse(opts.fetch(:uri)) if opts.include? :uri
  @status        = HTTP::Response::Status.new(opts.fetch(:status))
  @headers       = HTTP::Headers.coerce(opts[:headers] || {})
  @proxy_headers = HTTP::Headers.coerce(opts[:proxy_headers] || {})
  if opts.include?(:body)
    @body = opts.fetch(:body)
  else
    connection = opts.fetch(:connection)
    encoding   = opts[:encoding] || charset || Encoding::BINARY
    @body = Response::Body.new(connection, :encoding => encoding)
  end
end

def inspect
  "#<#{self.class}/#{@version} #{code} #{reason} #{headers.to_h.inspect}>"
end

def parse(as = nil)
  MimeType[as || mime_type].decode to_s
end

def to_a
  [status.to_i, headers.to_h, body.to_s]
end