require "rails_helper"

RSpec.describe Collection, type: :model do
  let(:user) { create(:user) }
  let(:collection) { create(:collection, :with_articles, user: user) }

  describe "validations" do
    subject { described_class.new }

    it { is_expected.to belong_to(:user) }
    it { is_expected.to belong_to(:organization).optional }
    it { is_expected.to have_many(:articles) }

    it { is_expected.to validate_presence_of(:user_id) }
    it { is_expected.to validate_presence_of(:slug) }
    it { is_expected.to validate_uniqueness_of(:slug).scoped_to(:user_id) }
  end

  describe ".find_series" do
    let(:user) { create(:user) }
    let(:series) { create(:collection, user: user) }

    it "returns an existing series" do
      series # the series has to be created before the following expect
      expect do
        expect(described_class.find_series(series.slug, series.user)).to eq(series)
      end.not_to change(described_class, :count)
    end

    it "creates a new series for a user if an existing one is not found" do
      slug = Faker::Books::CultureSeries.book
      expect { described_class.find_series(slug, user) }.to change(described_class, :count).by(1)
    end

    it "creates a new series with an existing slug for a new user" do
      user = create(:user)
      series # the series has to be created before the following expect
      expect { described_class.find_series(series.slug, user) }.to change(described_class, :count).by(1)
    end
  end

  describe "when a single article in collection is updated" do
    it "touches all articles in the collection" do
      random_article = collection.articles.sample
      expect { random_article.touch }.to(change { collection.articles.map(&:updated_at) })
    end
  end
end