module GdsApi::TestHelpers::EmailAlertApi

def assert_email_alert_sent(attributes = nil)
  if attributes
    matcher = ->(request) do
      payload = JSON.parse(request.body)
      payload.select { |k, _| attributes.key?(k) } == attributes
    end
  else
    matcher = nil
  end
  assert_requested(:post, notifications_url, times: 1, &matcher)
end

def email_alert_api_accepts_alert
  stub_request(:post, notifications_url)
    .to_return(
      :status => 202,
      :body => {}.to_json,
    )
end

def email_alert_api_creates_subscriber_list(attributes)
  stub_request(:post, subscriber_lists_url)
    .to_return(
      :status => 201,
      :body => get_subscriber_list_response(attributes).to_json,
    )
end

def email_alert_api_does_not_have_subscriber_list(attributes)
  query = Rack::Utils.build_nested_query(tags: attributes.fetch("tags"))
  stub_request(:get, subscriber_lists_url(query))
    .to_return(status: 404)
end

def email_alert_api_has_subscriber_list(attributes)
  title = attributes.fetch("title")
  tags = attributes.fetch("tags")
  query = Rack::Utils.build_nested_query(tags: tags)
  stub_request(:get, subscriber_lists_url(query))
    .to_return(
      :status => 200,
      :body => get_subscriber_list_response(attributes).to_json,
    )
end

def email_alert_api_refuses_to_create_subscriber_list
  stub_request(:post, subscriber_lists_url)
    .to_return(
      :status => 422,
    )
end

def get_subscriber_list_response(attributes)
  {
    "subscriber_list" => {
      "id" => "447135c3-07d6-4c3a-8a3b-efa49ef70e52",
      "subscription_url" => "https://stage-public.govdelivery.com/accounts/UKGOVUK/subscriber/new?topic_id=UKGOVUK_1234",
      "gov_delivery_id" => "UKGOVUK_1234",
      "title" => "Some title",
      "tags" => {
        "format" => ["some-format"],
      }
    }.merge(attributes)
  }
end

def notifications_url
  EMAIL_ALERT_API_ENDPOINT + "/notifications"
end

def post_alert_response
  {}
end

def stub_any_email_alert_api_call
  stub_request(:any, %r{\A#{EMAIL_ALERT_API_ENDPOINT}})
end

def subscriber_lists_url(query = nil)
  url = EMAIL_ALERT_API_ENDPOINT + "/subscriber-lists"
  query ? "#{url}?#{query}" : url
end