using NUnit.Framework;

namespace nqueens.tests
{
	[TestFixture]
	public class NBoardTests
	{
		[Test]
		public void GetConflicts_SameRow()
		{
			var nBoard = new NBoard(new [] {0,0,0,0});
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(3));
			Assert.That(nBoard.GetConflictCount(3), Is.EqualTo(3));
		}

		[Test]
		public void GetConflicts_SameRow_AfterUpdates()
		{
			var nBoard = new NBoard(new [] {0,0,0,0});
			nBoard.UpdateRow(0,2);
			Assert.That(nBoard.GetConflictCount(1), Is.EqualTo(2));
			nBoard.UpdateRow(2,1);
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(0));
			nBoard.UpdateRow(0,0);
			nBoard.UpdateRow(1,1);
			nBoard.UpdateRow(2,2);
			nBoard.UpdateRow(3,3);
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(3));
			Assert.That(nBoard.GetConflictCount(1), Is.EqualTo(3));
			Assert.That(nBoard.GetConflictCount(2), Is.EqualTo(3));
			Assert.That(nBoard.GetConflictCount(3), Is.EqualTo(3));
			nBoard.UpdateRow(3,2);
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(2));
			Assert.That(nBoard.GetConflictCount(1), Is.EqualTo(2));
			Assert.That(nBoard.GetConflictCount(2), Is.EqualTo(3));
			Assert.That(nBoard.GetConflictCount(3), Is.EqualTo(1));
		}

		[Test]
		public void GetConflicts_OneNonConflictRow()
		{
			var nBoard = new NBoard(new [] {2,0,0,0});
			Assert.That(nBoard.GetConflictCount(1), Is.EqualTo(2));
		}

		[Test]
		public void GetConflicts_NoConflicts()
		{
			var nBoard = new NBoard(new [] {2,0,1,0});
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(0));
		}

		[Test]
		public void GetConflicts_AllDiagonalConflict()
		{
			var nBoard = new NBoard(new [] {0,1,2,3});
			Assert.That(nBoard.GetConflictCount(2), Is.EqualTo(3));
		}

		[Test]
		public void GetConflicts_AllOppositeDiagonalConflict()
		{
			var nBoard = new NBoard(new [] {3,2,1,0});
			Assert.That(nBoard.GetConflictCount(3), Is.EqualTo(3));
		}

		[Test]
		public void GetConflicts_TwoOppositeDiagonalConflict()
		{
			var nBoard = new NBoard(new [] {0,1,2,2});
			Assert.That(nBoard.GetConflictCount(0), Is.EqualTo(2));
		}
	}
}