require 'spec_helper'

describe Feedbook::Listener do
  
  subject { Feedbook::Listener } 
  
  describe '#start' do

    let(:configuration) { double }
    let(:feeds) { [double, double, double] }

    before :each do
      allow(configuration).to receive(:interval).and_return(300)
      allow(subject).to receive(:load_configuration).with('feedbook.yml').and_return([feeds, configuration])
    end

    it 'parses hash and creates Feed instance' do
      expect(Feedbook::PluginsManager).to receive(:load_plugins).with('./plugins')

      allow(configuration).to receive(:load_notifiers)
      
      feeds.each do |feed|
        expect(feed).to receive(:fetch)
        expect(feed).to receive(:valid?)
      end

      expect(Object).to receive(:every).with(300).and_return(300)

      subject.start('feedbook.yml', './plugins')
    end
  end

  describe '#start_offline' do

    context 'there is no file with archived feeds' do
      let(:configuration) { double }
      let(:feeds) { [double, double, double] }
      let(:feeds_with_posts) do
        feeds.map do |feed|
          {
            feed: feed,
            posts: nil
          }
        end
      end

      before :each do
        allow(subject).to receive(:load_configuration).with('feedbook.yml').and_return([feeds, configuration])
        allow(subject).to receive(:load_feeds_archive).with('feedbook_offline.yml').and_return([])
      end

      it 'parses hash and creates Feed instance' do
        expect(Feedbook::PluginsManager).to receive(:load_plugins).with('./plugins')

        allow(configuration).to receive(:load_notifiers)

        feeds.each do |feed|
          expect(feed).to receive(:fetch)
          expect(feed).to receive(:valid?)
          expect(subject).to receive(:observe_and_notify).with({
            feed: feed,
            posts: nil
          })
        end

        expect(subject).to receive(:save_feeds_archive).with('feedbook_offline.yml', feeds_with_posts)

        subject.start_offline('feedbook.yml', 'feedbook_offline.yml', './plugins')
      end
    end

    context 'there is file with archived feeds' do
      let(:configuration) { double }
      let(:feeds) { [double, double, double] }

      before :each do
        allow(subject).to receive(:load_configuration).with('feedbook.yml').and_return([feeds, configuration])
        allow(subject).to receive(:load_feeds_archive).with('feedbook_offline.yml').and_return(feeds)
      end

      it 'parses hash and creates Feed instance' do
        expect(Feedbook::PluginsManager).to receive(:load_plugins).with('./plugins')

        allow(configuration).to receive(:load_notifiers)

        feeds.each do |feed|
          expect(feed).to receive(:valid?)
          expect(subject).to receive(:observe_and_notify).with(feed)
        end

        expect(subject).to receive(:save_feeds_archive).with('feedbook_offline.yml', feeds)

        subject.start_offline('feedbook.yml', 'feedbook_offline.yml', './plugins')
      end
    end
  end

  describe '#observe_and_notify' do

    context 'there are new posts' do
      let(:feed) do
        {
          posts: [OpenStruct.new(url: '1'), OpenStruct.new(url: '2')],
          feed: double
        }
      end

      let(:notifications) { [double, double] }

      before :each do
        expect(feed[:feed]).to receive(:fetch).and_return([OpenStruct.new(url: '1'), OpenStruct.new(url: '2'), OpenStruct.new(url: '3'), OpenStruct.new(url: '4')])
        expect(feed[:feed]).to receive(:notifications).twice.and_return(notifications)
      end

      it 'parses hash and creates Feed instance' do
        expect(Feedbook::Comparers::PostsComparer).to receive(:get_new_posts).with([OpenStruct.new(url: '1'), OpenStruct.new(url: '2')], [OpenStruct.new(url: '1'), OpenStruct.new(url: '2'), OpenStruct.new(url: '3'), OpenStruct.new(url: '4')]).and_return([OpenStruct.new(url: '3'), OpenStruct.new(url: '4')])
        notifications.each do |notification|
          expect(notification).to receive(:notify).with(OpenStruct.new(url: '3')).and_return(nil)
          expect(notification).to receive(:notify).with(OpenStruct.new(url: '4')).and_return(nil)
        end

        expect(subject.observe_and_notify(feed)[:posts]).to eq([OpenStruct.new(url: '1'), OpenStruct.new(url: '2'), OpenStruct.new(url: '3'), OpenStruct.new(url: '4')])
      end
    end

    context 'there are no new posts' do
      let(:feed) do
        {
          posts: [OpenStruct.new(url: '1'), OpenStruct.new(url: '2')],
          feed: double
        }
      end

      before :each do
        expect(feed[:feed]).to receive(:fetch).and_return([OpenStruct.new(url: '1'), OpenStruct.new(url: '2')])
      end

      it 'parses hash and creates Feed instance' do
        expect(Feedbook::Comparers::PostsComparer).to receive(:get_new_posts).with([OpenStruct.new(url: '1'), OpenStruct.new(url: '2')], [OpenStruct.new(url: '1'), OpenStruct.new(url: '2')]).and_return([])

        expect(subject.observe_and_notify(feed)[:posts]).to eq([OpenStruct.new(url: '1'), OpenStruct.new(url: '2')])
      end
    end
  end
end