using System;
using System.Collections.Generic;

using Xamarin.Forms;

using NUnit.Framework;
using Xamarin.Forms.Core.UnitTests;

namespace Xamarin.Forms.Xaml.UnitTests
{
	public partial class Issue2659 : ContentPage
	{
		public Issue2659 ()
		{
			InitializeComponent ();
		}

		public Issue2659 (bool useCompiledXaml)
		{
			//this stub will be replaced at compile time
		}

		void OnSetStyleButtonClicked(object sender, EventArgs args)
		{
			Style style = (Style)Resources["buttonStyle"];
			SetButtonStyle(style);
		}

		void OnUnsetStyleButtonClicked(object sender, EventArgs args)
		{
			SetButtonStyle (null);
		}

		void OnSetLocalButtonClicked(object sender, EventArgs args)
		{
			EnumerateButtons ((Button button) => {
				button.TextColor = Color.Red;
				button.FontAttributes = FontAttributes.Bold;
			});
		}

		void OnClearLocalButtonClicked(object sender, EventArgs args)
		{
			EnumerateButtons ((Button button) => {
				button.ClearValue (Button.TextColorProperty);
				button.ClearValue (Button.FontAttributesProperty);
			});
		}

		void SetButtonStyle(Style style)
		{
			EnumerateButtons (button => {
				button.Style = style;
			});
		}

		void EnumerateButtons(Action<Button> action)
		{
			foreach (View view in stackLayout.Children)
				action ((Button)view);
		}

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

			void AssertStyleApplied (Button button)
			{
				Assert.AreEqual (LayoutOptions.Center, button.HorizontalOptions);
				Assert.AreEqual (LayoutOptions.CenterAndExpand, button.VerticalOptions);
				Assert.AreEqual (16, button.FontSize);
				Assert.AreEqual (Color.Blue, button.TextColor);
				Assert.AreEqual (FontAttributes.Italic, button.FontAttributes);
			}

			void AssertStyleUnApplied (Button button)
			{
				Assert.AreEqual (View.HorizontalOptionsProperty.DefaultValue, button.HorizontalOptions);
				Assert.AreEqual (View.VerticalOptionsProperty.DefaultValue, button.VerticalOptions);
				Assert.AreEqual (10, button.FontSize);
				Assert.AreEqual (Button.TextColorProperty.DefaultValue, button.TextColor);
				Assert.AreEqual (Button.FontAttributesProperty.DefaultValue, button.FontAttributes);
			}

			[TestCase (false)]
			[TestCase (true)]
			public void SetUnsetStyleFromResource (bool useCompiledXaml)
			{
				var layout = new Issue2659 (useCompiledXaml);
				layout.EnumerateButtons (AssertStyleUnApplied);

				((IButtonController)layout.button0).SendClicked ();
				layout.EnumerateButtons (AssertStyleApplied);

				((IButtonController)layout.button1).SendClicked ();
				layout.EnumerateButtons (AssertStyleUnApplied);
			}

			void AssertPropertiesApplied (Button button)
			{
				Assert.AreEqual (Color.Red, button.TextColor);
				Assert.AreEqual (FontAttributes.Bold, button.FontAttributes);
			}

			void AssertPropertiesUnApplied (Button button)
			{
				Assert.AreEqual (Button.TextColorProperty.DefaultValue, button.TextColor);
				Assert.AreEqual (Button.FontAttributesProperty.DefaultValue, button.FontAttributes);
			}

			[TestCase (false)]
			[TestCase (true)]
			public void SetUnsetLocalProperties (bool useCompiledXaml)
			{
				var layout = new Issue2659 (useCompiledXaml);
				layout.EnumerateButtons (AssertPropertiesUnApplied);

				((IButtonController)layout.button2).SendClicked ();
				layout.EnumerateButtons (AssertPropertiesApplied);

				((IButtonController)layout.button3).SendClicked ();
				layout.EnumerateButtons (AssertPropertiesUnApplied);
			}
		}
	}
}