require 'helper'
require 'flipper/adapters/memory'
require 'flipper/adapters/instrumented'
require 'flipper/instrumenters/memory'
require 'flipper/spec/shared_adapter_specs'

RSpec.describe Flipper::Adapters::Instrumented do
  let(:instrumenter) { Flipper::Instrumenters::Memory.new }
  let(:adapter) { Flipper::Adapters::Memory.new }
  let(:flipper) { Flipper.new(adapter) }

  let(:feature) { flipper[:stats] }
  let(:gate) { feature.gate(:percentage_of_actors) }
  let(:thing) { flipper.actors(22) }

  subject {
    described_class.new(adapter, :instrumenter => instrumenter)
  }

  it_should_behave_like 'a flipper adapter'

  it "forwards missing methods to underlying adapter" do
    adapter = Class.new do
      def foo
        :foo
      end
    end.new
    instrumented = described_class.new(adapter)
    expect(instrumented.foo).to eq(:foo)
  end

  describe "#name" do
    it "is instrumented" do
      expect(subject.name).to be(:instrumented)
    end
  end

  describe "#get" do
    it "records instrumentation" do
      result = subject.get(feature)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:get)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#enable" do
    it "records instrumentation" do
      result = subject.enable(feature, gate, thing)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:enable)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:gate_name]).to eq(:percentage_of_actors)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#disable" do
    it "records instrumentation" do
      result = subject.disable(feature, gate, thing)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:disable)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:gate_name]).to eq(:percentage_of_actors)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#add" do
    it "records instrumentation" do
      result = subject.add(feature)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:add)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#remove" do
    it "records instrumentation" do
      result = subject.remove(feature)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:remove)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#clear" do
    it "records instrumentation" do
      result = subject.clear(feature)

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:clear)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:feature_name]).to eq(:stats)
      expect(event.payload[:result]).to be(result)
    end
  end

  describe "#features" do
    it "records instrumentation" do
      result = subject.features

      event = instrumenter.events.last
      expect(event).not_to be_nil
      expect(event.name).to eq('adapter_operation.flipper')
      expect(event.payload[:operation]).to eq(:features)
      expect(event.payload[:adapter_name]).to eq(:memory)
      expect(event.payload[:result]).to be(result)
    end
  end
end