require 'spec_helper'

describe Agents::PeakDetectorAgent do
  before do
    @valid_params = {
        :name => "my peak detector agent",
        :options => {
            :expected_receive_period_in_days => "2",
            :group_by_path => "filter",
            :value_path => "count",
            :message => "A peak was found"
        }
    }

    @agent = Agents::PeakDetectorAgent.new(@valid_params)
    @agent.user = users(:bob)
    @agent.save!
  end

  describe "#receive" do
    it "tracks and groups by the group_by_path" do
      events = build_events(:keys => [:count, :filter],
                            :values => [[1, "something"], [2, "something"], [3, "else"]])
      @agent.receive events
      @agent.memory[:data][:something].map(&:first).should == [1, 2]
      @agent.memory[:data][:something].last.last.should be_within(10).of((100 - 1).hours.ago.to_i)
      @agent.memory[:data][:else].first.first.should == 3
      @agent.memory[:data][:else].first.last.should be_within(10).of((100 - 2).hours.ago.to_i)
    end

    it "works without a group_by_path as well" do
      @agent.options[:group_by_path] = ""
      events = build_events(:keys => [:count], :values => [[1], [2]])
      @agent.receive events
      @agent.memory[:data][:no_group].map(&:first).should == [1, 2]
    end

    it "keeps a rolling window of data" do
      @agent.options[:window_duration_in_days] = 5/24.0
      @agent.receive build_events(:keys => [:count],
                                  :values => [1, 2, 3, 4, 5, 6, 7, 8].map {|i| [i]},
                                  :pattern => { :filter => "something" })
      @agent.memory[:data][:something].map(&:first).should == [4, 5, 6, 7, 8]
    end

    it "finds peaks" do
      build_events(:keys => [:count],
                   :values => [5, 6,
                               4, 5,
                               4, 5,
                               15, 11, # peak
                               8, 50, # ignored because it's too close to the first peak
                               4, 5].map {|i| [i]},
                   :pattern => { :filter => "something" }).each.with_index do |event, index|
        lambda {
          @agent.receive([event])
        }.should change { @agent.events.count }.by( index == 6 ? 1 : 0 )
      end

      @agent.events.last.payload[:peak].should == 15.0
      @agent.memory[:peaks][:something].length.should == 1
    end

    it "keeps a rolling window of peaks" do
      @agent.options[:min_peak_spacing_in_days] = 1/24.0
      @agent.receive build_events(:keys => [:count],
                                  :values => [1, 1, 1, 1, 1, 1, 10, 1, 1, 1, 1, 1, 1, 1, 10, 1].map {|i| [i]},
                                  :pattern => { :filter => "something" })
      @agent.memory[:peaks][:something].length.should == 2
    end
  end

  describe "validation" do
    before do
      @agent.should be_valid
    end

    it "should validate presence of message" do
      @agent.options[:message] = nil
      @agent.should_not be_valid
    end

    it "should validate presence of expected_receive_period_in_days" do
      @agent.options[:expected_receive_period_in_days] = ""
      @agent.should_not be_valid
    end

    it "should validate presence of value_path" do
      @agent.options[:value_path] = ""
      @agent.should_not be_valid
    end
  end
end