using Calculator.Domain;
using Calculator.Test.Extensions;
using MbUnit.Framework;

namespace Calculator.Test.domain {
	[TestFixture]
	public class CurrentCalculationTest {
		public ICurrentCalculation CreateSUT() {
			return new CurrentCalculation( new StandardCalculator( ) );
		}

		[RowTest]
		[Row( 10, 20, 30 )]
		[Row( 30, 69, 99 )]
		public void should_be_able_to_add_two_numbers_together( int left, int right, int expectedResult ) {
			var calculation = CreateSUT( );
			calculation.Enter( Number( left ) );
			calculation.Include( Operators.Addition );
			calculation.Enter( Number( right ) );

			var result = calculation.IsEqualTo( );
			result.ShouldBeEqualTo( Number( expectedResult ) );
		}

		[Test]
		public void should_be_able_to_subtract_one_number_from_another() {
			var calculation = CreateSUT();
			calculation.Enter( Number(48) );
			calculation.Include( Operators.Subtraction );
			calculation.Enter( Number(42) );
			var resultOfCalculation = calculation.IsEqualTo();
			resultOfCalculation.ShouldBeEqualTo( Number(6) );
		}

		[Test]
		public void should_be_able_to_subtract_one_number_from_another_then_add_a_number() {
			var calculation = CreateSUT();
			calculation.Enter( Number(53) );
			calculation.Include( Operators.Subtraction );
			calculation.Enter( Number(35) );
			calculation.Include( Operators.Addition );
			calculation.Enter( Number(22) );
			var resultOfCalculation = calculation.IsEqualTo( );
			resultOfCalculation.ShouldBeEqualTo( Number( 40) );
		}

		private INumber Number( long number ) {
			return new Number( number );
		}
	}
}