module ActionController::TestCase::Behavior

def build_response(klass)
  klass.create
end

def check_required_ivars
  # Sanity check for required instance variables so we can give an
  # understandable error message.
  [:@routes, :@controller, :@request, :@response].each do |iv_name|
    if !instance_variable_defined?(iv_name) || instance_variable_get(iv_name).nil?
      raise "#{iv_name} is nil: make sure you set it in your test's setup method."
    end
  end
end

def controller_class_name
  @controller.class.anonymous? ? "anonymous" : @controller.class.controller_path
end

def delete(action, **args)
  process(action, method: "DELETE", **args)
end

def document_root_element
  html_document.root
end

def generated_path(generated_extras)
  generated_extras[0]
end

def get(action, **args)
  res = process(action, method: "GET", **args)
  cookies.update res.cookies
  res
end

def head(action, **args)
  process(action, method: "HEAD", **args)
end

def patch(action, **args)
  process(action, method: "PATCH", **args)
end

def post(action, **args)
  process(action, method: "POST", **args)
end

def process(action, method: "GET", params: {}, session: nil, body: nil, flash: {}, format: nil, xhr: false, as: nil)
  check_required_ivars
  http_method = method.to_s.upcase
  @html_document = nil
  cookies.update(@request.cookies)
  cookies.update_cookies_from_jar
  @request.set_header "HTTP_COOKIE", cookies.to_header
  @request.delete_header "action_dispatch.cookies"
  @request          = TestRequest.new scrub_env!(@request.env), @request.session, @controller.class
  @response         = build_response @response_klass
  @response.request = @request
  @controller.recycle!
  if body
    @request.set_header "RAW_POST_DATA", body
  end
  @request.set_header "REQUEST_METHOD", http_method
  if as
    @request.content_type = Mime[as].to_s
    format ||= as
  end
  parameters = params.symbolize_keys
  if format
    parameters[:format] = format
  end
  generated_extras = @routes.generate_extras(parameters.merge(controller: controller_class_name, action: action.to_s))
  generated_path = generated_path(generated_extras)
  query_string_keys = query_parameter_names(generated_extras)
  @request.assign_parameters(@routes, controller_class_name, action.to_s, parameters, generated_path, query_string_keys)
  @request.session.update(session) if session
  @request.flash.update(flash || {})
  if xhr
    @request.set_header "HTTP_X_REQUESTED_WITH", "XMLHttpRequest"
    @request.fetch_header("HTTP_ACCEPT") do |k|
      @request.set_header k, [Mime[:js], Mime[:html], Mime[:xml], "text/xml", "*/*"].join(", ")
    end
  end
  @request.fetch_header("SCRIPT_NAME") do |k|
    @request.set_header k, @controller.config.relative_url_root
  end
  begin
    @controller.recycle!
    @controller.dispatch(action, @request, @response)
  ensure
    @request = @controller.request
    @response = @controller.response
    if @request.have_cookie_jar?
      unless @request.cookie_jar.committed?
        @request.cookie_jar.write(@response)
        cookies.update(@request.cookie_jar.instance_variable_get(:@cookies))
      end
    end
    @response.prepare!
    if flash_value = @request.flash.to_session_value
      @request.session["flash"] = flash_value
    else
      @request.session.delete("flash")
    end
    if xhr
      @request.delete_header "HTTP_X_REQUESTED_WITH"
      @request.delete_header "HTTP_ACCEPT"
    end
    @request.query_string = ""
    @response.sent!
  end
  @response
end

def put(action, **args)
  process(action, method: "PUT", **args)
end

def query_parameter_names(generated_extras)
  generated_extras[1] + [:controller, :action]
end

def scrub_env!(env)
  env.delete_if { |k, v| k =~ /^(action_dispatch|rack)\.request/ }
  env.delete_if { |k, v| k =~ /^action_dispatch\.rescue/ }
  env.delete "action_dispatch.request.query_parameters"
  env.delete "action_dispatch.request.request_parameters"
  env["rack.input"] = StringIO.new
  env.delete "CONTENT_LENGTH"
  env.delete "RAW_POST_DATA"
  env
end

def setup_controller_request_and_response
  @controller = nil unless defined? @controller
  @response_klass = ActionDispatch::TestResponse
  if klass = self.class.controller_class
    if klass < ActionController::Live
      @response_klass = LiveTestResponse
    end
    unless @controller
      begin
        @controller = klass.new
      rescue
        warn "could not construct controller #{klass}" if $VERBOSE
      end
    end
  end
  @request          = TestRequest.create(@controller.class)
  @response         = build_response @response_klass
  @response.request = @request
  if @controller
    @controller.request = @request
    @controller.params = {}
  end
end