using System;
using System.Collections.Generic;

using Xamarin.Forms;
using Xamarin.Forms.Core.UnitTests;

using NUnit.Framework;

namespace Xamarin.Forms.Xaml.UnitTests
{
	public partial class ConstraintExpression : ContentPage
	{
		public ConstraintExpression ()
		{
			InitializeComponent ();
		}

		public ConstraintExpression (bool useCompiledXaml)
		{
			//this stub will be replaced at compile time
		}

		[TestFixture]
		public class Tests
		{
			[SetUp]
			public void Setup ()
			{
				Device.PlatformServices = new MockPlatformServices ();
			}

			[TestCase (false)]
			[TestCase (true)]
			public void ConstantConstraint (bool useCompiledXaml)
			{
				var layout = new ConstraintExpression (useCompiledXaml);
				var label = layout.constantConstraint;
				var constraint = RelativeLayout.GetWidthConstraint (label);
				Assert.NotNull (constraint);
				Assert.AreEqual (42, constraint.Compute (null));
			}

			[TestCase (false)]
			[TestCase (true)]
			public void ConstraintRelativeToParent (bool useCompiledXaml)
			{
				var layout = new ConstraintExpression (useCompiledXaml);
				layout.relativeLayout.Layout (new Rectangle (0, 0, 200, 200));
				var label = layout.constraintRelativeToParent;
				var constraint = RelativeLayout.GetWidthConstraint (label);
				Assert.NotNull (constraint);
				Assert.AreEqual (102, constraint.Compute (layout.relativeLayout));
			}

			[TestCase (false)]
			[TestCase (true)]
			public void ContraintRelativeToView (bool useCompiledXaml)
			{
				var layout = new ConstraintExpression (useCompiledXaml) { 
					IsPlatformEnabled = true
				};
				layout.relativeLayout.Layout (new Rectangle (0, 0, 200, 100));
				layout.foo.Layout (new Rectangle (5, 5, 190, 25));

				var label = layout.constraintRelativeToView;
				var constraint = RelativeLayout.GetWidthConstraint (label);
				Assert.NotNull (constraint);
				Assert.AreEqual (97, constraint.Compute (layout.relativeLayout));
			}
		}
	}
}