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
  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)
  stub_request(:get, subscriber_lists_url(attributes))
    .to_return(status: 404)
end

def email_alert_api_has_notification(notification)
  url = "#{notifications_url}/#{notification['web_service_bulletin']['to_param']}"
  stub_request(:get, url).to_return(
    status: 200,
    body: notification.to_json
  )
end

def email_alert_api_has_notifications(notifications, start_at = nil)
  url = notifications_url
  url += "?start_at=#{start_at}" if start_at
  url_regexp = Regexp.new("^#{Regexp.escape(url)}$")
  stub_request(:get, url_regexp)
    .to_return(
      status: 200,
      body: notifications.to_json
    )
end

def email_alert_api_has_subscriber_list(attributes)
  stub_request(:get, subscriber_lists_url(attributes))
    .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",
    }.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(attributes = nil)
  if attributes
    tags = attributes["tags"]
    links = attributes["links"]
    document_type = attributes["document_type"]
    params = {}
    params[:tags] = tags if tags
    params[:links] = links if links
    params[:document_type] = document_type if document_type
    query = Rack::Utils.build_nested_query(params)
  end
  url = EMAIL_ALERT_API_ENDPOINT + "/subscriber-lists"
  query ? "#{url}?#{query}" : url
end