require 'inst_statsd'

describe QuizApiClient::HttpRequest::Metrics do
  let(:config) { QuizApiClient::Config.new }
  let(:method) { 'GET' }
  let(:url) { 'https://something.com' }
  let(:code) { 200 }

  subject { described_class.new(config, method, url, code) }

  describe '#increment' do
    it 'does nothing when the metrics handler is nil' do
      allow(config).to receive(:metrics_handler).and_return(nil)
      expect(InstStatsd::Statsd).to receive(:increment).never

      subject.increment
    end

    it 'does nothing when the metrics namespace is nil' do
      allow(config).to receive(:metrics_namespace).and_return(nil)
      expect(InstStatsd::Statsd).to receive(:increment).never

      subject.increment
    end

    it 'calls the #increment method for InstStatsd' do
      config.setup_metrics(:inststatsd, 'fake-namespace')
      expect(InstStatsd::Statsd).to receive(:increment).with(
        'fake-namespace.quiz_api_client.request.count',
        tags: {
          method: method,
          status: code,
          url: url
        }
      )

      subject.increment
    end
  end

  describe '#duration' do
    let(:duration_in_secs) { 10 }
    let(:start_time) { Time.parse('2021-11-09 15:11:48 -0500') }
    let(:end_time) { start_time + duration_in_secs }

    it 'does nothing when the metrics handler is nil' do
      allow(config).to receive(:metrics_handler).and_return(nil)
      expect(InstStatsd::Statsd).to receive(:timing).never

      subject.duration(start_time, end_time)
    end

    it 'does nothing when the metrics namespace is nil' do
      allow(config).to receive(:metrics_namespace).and_return(nil)
      expect(InstStatsd::Statsd).to receive(:timing).never

      subject.duration(start_time, end_time)
    end

    it 'calls the #timing method for InstStatsd' do
      config.setup_metrics(:inststatsd, 'fake-namespace')
      expect(InstStatsd::Statsd).to receive(:timing).with(
        'fake-namespace.quiz_api_client.request.duration_ms',
        duration_in_secs * 1_000,
        tags: {
          method: method,
          status: code,
          url: url
        }
      )

      subject.duration(start_time, end_time)
    end
  end
end