using System.Drawing;
using NUnit.Framework;

namespace Sacs.UnitTests.Net.Standard.Base.Generic
{
	[TestFixture]
	public class ObjectReferences_Tester
	{
		// --- Tests ---

		[Test]
		public void ObjectReferences_ChangeValuesOnReferencedObject ()
		{
			// size2 starts as a reference to size1.
			Size size1 = new Size(10, 20);
			Size size2 = size1;
			Size size3 = new Size(10, 20);
			Assert.That(size2, Is.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size2));
			// Change size1 values - doesn't change size2.
			size1.Width = 100;
			size1.Height = 200;
			Assert.That(size2, Is.Not.EqualTo(size1));
			Assert.That(size3, Is.Not.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size2));
		}
		[Test]
		public void ObjectReferences_ChangeValuesOnObjectReference ()
		{
			// size2 starts as a reference to size1.
			Size size1 = new Size(10, 20);
			Size size2 = size1;
			Size size3 = new Size(10, 20);
			Assert.That(size2, Is.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size2));
			// Change size2 values - doesn't change size1.
			size2.Width = 100;
			size2.Height = 200;
			Assert.That(size2, Is.Not.EqualTo(size1));
			Assert.That(size3, Is.EqualTo(size1));
			Assert.That(size3, Is.Not.EqualTo(size2));
		}
		// Modify class value.
		class TestData
		{
			public int a = 0;
			public int B { get; set; }
			public Size size1 = new Size(10,20);
			public Size Size2 { get; set; } = new Size(30, 40);
		}
		[Test]
		public void ObjectReferences_ChangeClassValues ()
		{
			TestData td1 = new TestData();
			TestData td2 = td1;
			Assert.That(td2, Is.EqualTo(td1));
			td1.a++;  // td2 is still a reference to td1 with the same values.
			Assert.That(td2, Is.EqualTo(td1));
			Assert.That(td2.a, Is.EqualTo(td1.a));
			Assert.That(td2.B, Is.EqualTo(td1.B));
			Assert.That(td2.size1, Is.EqualTo(td1.size1));
			Assert.That(td2.Size2, Is.EqualTo(td1.Size2));
			td1.B++;  // td2 is still a reference to td1 with the same values.
			Assert.That(td2, Is.EqualTo(td1));
			Assert.That(td2.a, Is.EqualTo(td1.a));
			Assert.That(td2.B, Is.EqualTo(td1.B));
			Assert.That(td2.size1, Is.EqualTo(td1.size1));
			Assert.That(td2.Size2, Is.EqualTo(td1.Size2));
			td1.size1.Width += 10;  // td2 is still a reference to td1 with the same values.
			Assert.That(td2, Is.EqualTo(td1));
			Assert.That(td2.a, Is.EqualTo(td1.a));
			Assert.That(td2.B, Is.EqualTo(td1.B));
			Assert.That(td2.size1, Is.EqualTo(td1.size1));
			Assert.That(td2.Size2, Is.EqualTo(td1.Size2));
			td1.Size2 = new Size(td1.Size2.Width, td1.Size2.Height + 10);  // td2 is still a reference to td1 with the same values.
			Assert.That(td2, Is.EqualTo(td1));
			Assert.That(td2.a, Is.EqualTo(td1.a));
			Assert.That(td2.B, Is.EqualTo(td1.B));
			Assert.That(td2.size1, Is.EqualTo(td1.size1));
			Assert.That(td2.Size2, Is.EqualTo(td1.Size2));
		}

		// --- The End ---
	}
}