RSpec.describe Calendar::Period, type: :model do


  subject { period }

  def period(attributes = {})
    @__period__ ||= {}
    @__period__.fetch(attributes){
      @__period__[attributes] = Calendar::Period.new(attributes)
    }
  end

  it 'should support mark_for_destruction (required by cocoon)' do
    period.mark_for_destruction
    expect(period).to be_marked_for_destruction
  end

  it 'should support _destroy attribute (required by coocon)' do
    period._destroy = true
    expect(period).to be_marked_for_destruction
  end

  it 'should support new_record? (required by cocoon)' do
    expect(Calendar::Period.new).to be_new_record
    expect(period(id: 42)).not_to be_new_record
  end

  it 'should cast begin as date attribute' do
    expect(period(begin: '2016-11-22').begin).to eq(Date.new(2016,11,22))
  end

  it 'should cast end as date attribute' do
    expect(period(end: '2016-11-22').end).to eq(Date.new(2016,11,22))
  end

  it { is_expected.to validate_presence_of(:begin) }
  it { is_expected.to validate_presence_of(:end) }

  it 'should validate that end is greather than to begin' do
    expect(period(begin: '2016-11-21', end: '2016-11-22')).to be_valid
    expect(period(begin: '2016-11-22', end: '2016-11-21')).to_not be_valid
  end

  it 'should accept a 1-day period' do
    expect(period(begin: '2016-11-21', end: '2016-11-21')).to be_valid
  end

  describe 'intersect?' do
    it 'should detect date in common with other date_ranges' do
      november = period(begin: '2016-11-01', end: '2016-11-30')
      mid_november_mid_december = period(begin: '2016-11-15', end: '2016-12-15')
      expect(november.intersect?(mid_november_mid_december)).to be(true)
    end

    it 'should not intersect when no date is in common' do
      november = period(begin: '2016-11-01', end: '2016-11-30')
      december = period(begin: '2016-12-01', end: '2016-12-31')

      expect(november.intersect?(december)).to be(false)

      january = period(begin: '2017-01-01', end: '2017-01-31')
      expect(november.intersect?(december, january)).to be(false)
    end

    it 'should not intersect itself' do
      period = period(id: 42, begin: '2016-11-01', end: '2016-11-30')
      expect(period.intersect?(period)).to be(false)
    end

  end
end