# frozen_string_literal: true

RSpec.describe PlanetExpress::DiscountBudget do
  let(:budget) { 500 }
  subject { described_class.new(budget: budget) }

  describe '#register_applied_discount' do
    context 'with sufficient remaining budget' do
      it 'returns the full discount' do
        expect(subject.register_applied_discount(120)).to eq(120)
        expect(subject.available_budget).to eq(380)
        expect(subject.remaining_budget?).to eq(true)
      end
    end

    context 'with insufficient remaining budget' do
      it 'returns only the remaining budget' do
        expect(subject.register_applied_discount(650)).to eq(500)
        expect(subject.available_budget).to eq(0)
        expect(subject.remaining_budget?).to eq(false)
      end
    end
  end

  describe '#maximum_possible_discount' do
    context 'with sufficient budget' do
      it 'returns the full discount amount' do
        expect(subject.maximum_possible_discount(300)).to eq(300)
      end
    end

    context 'with insufficient budget' do
      it 'returns the maximum possible amount' do
        expect(subject.maximum_possible_discount(600)).to eq(500)
      end
    end
  end
end