require 'spec_helper'

describe Cassie::Subscribers do
  
  it "should be able to add and remove a subscriber" do
    subscribers = Cassie::Subscribers.new
    expect(subscribers.empty?).to eq true
    data_1 = []
    data_2 = []
    subscriber_1 = lambda{|info| data_1 << info}
    subscriber_2 = lambda{|info| data_2 << info}
    subscribers.add(subscriber_1)
    subscribers << subscriber_2
    expect(subscribers.empty?).to eq false
    expect(subscribers.size).to eq 2
    expect(subscribers.include?(subscriber_1)).to eq true
    expect(subscribers.include?(subscriber_2)).to eq true
    
    subscribers.each{|s| s.call(:payload)}
    expect(data_1).to eq [:payload]
    expect(data_2).to eq [:payload]
    
    subscribers.remove(subscriber_2)
    expect(subscribers.size).to eq 1
    expect(subscribers.include?(subscriber_1)).to eq true
    expect(subscribers.include?(subscriber_2)).to eq false
    
    subscribers.each{|s| s.call(:more)}
    expect(data_1).to eq [:payload, :more]
    expect(data_2).to eq [:payload]
    
    subscribers.delete(subscriber_1)
    expect(subscribers.size).to eq 0
  end
  
  it "should have a hierarchy of subscribers" do
    subscribers_1 = Cassie::Subscribers.new
    subscribers_2 = Cassie::Subscribers.new(subscribers_1)
    subscribers_3 = Cassie::Subscribers.new(subscribers_1)
    data_1 = []
    data_2 = []
    data_3 = []
    subscribers_1 << lambda{|info| data_1 << info}
    subscribers_2 << lambda{|info| data_2 << info}
    
    expect(subscribers_1.size).to eq 1
    expect(subscribers_2.size).to eq 2
    expect(subscribers_3.size).to eq 1
    
    subscribers_1.each{|subscriber| subscriber.call(:payload_1)}
    subscribers_2.each{|subscriber| subscriber.call(:payload_2)}
    subscribers_3.each{|subscriber| subscriber.call(:payload_3)}
    
    expect(data_1).to eq [:payload_1, :payload_2, :payload_3]
    expect(data_2).to eq [:payload_2]
    
    subscribers_2.clear
    expect(subscribers_2.size).to eq 1
    subscribers_1.clear
    expect(subscribers_2.size).to eq 0
  end
  
end