using System.Collections.Generic;

using System.Linq;

using DeltaEngine.Content;

using DeltaEngine.Core;

using DeltaEngine.Datatypes;

using DeltaEngine.Entities;

using DeltaEngine.Input;

using DeltaEngine.Input.Mocks;

using DeltaEngine.Platforms;

using DeltaEngine.Rendering2D;

using DeltaEngine.Scenes.Controls;

using NUnit.Framework;



namespace DeltaEngine.Scenes.Tests

{

	public class SceneTests : TestWithMocksOrVisually

	{

		[SetUp]

		public void SetUp()

		{

			scene = new Scene();

			material = new Material(ShaderFlags.Position2DColoredTextured, "DeltaEngineLogo");

			window = Resolve<Window>();

		}



		private Scene scene;

		private Material material;

		private Window window;



		

		[Test, CloseAfterFirstFrame]

		public void LoadSceneWithoutAnyControls()

		{

			var loadedScene = ContentLoader.Load<Scene>("EmptyScene");

			Assert.AreEqual("EmptyScene", loadedScene.Name);

			Assert.AreEqual(0, loadedScene.Controls.Count);

		} 



		[Test]

		public void LoadSceneWithAButton()

		{

			var loadedScene = ContentLoader.Load<Scene>("SceneWithAButton");

			Assert.AreEqual("SceneWithAButton", loadedScene.Name);

			Assert.AreEqual(1, loadedScene.Controls.Count);

			Assert.AreEqual(typeof(Button), loadedScene.Controls[0].GetType());

		}



		[Test, CloseAfterFirstFrame]

		public void LoadSceneWithAButtonAndChangeTheMaterial()

		{

			var loadedScene = ContentLoader.Load<Scene>("SceneWithAButtonWithChangedMaterial");

			Assert.AreEqual("SceneWithAButtonWithChangedMaterial", loadedScene.Name);

			Assert.AreEqual(1, loadedScene.Controls.Count);

			Assert.AreEqual(typeof(Button), loadedScene.Controls[0].GetType());

		}



		[Test, CloseAfterFirstFrame]

		public void LoadSceneWithAButtonAndChangeTheFontText()

		{

			var loadedScene = ContentLoader.Load<Scene>("SceneWithAButtonWithDifferentFontText");

			Assert.AreEqual("SceneWithAButtonWithDifferentFontText", loadedScene.Name);

			Assert.AreEqual(1, loadedScene.Controls.Count);

			Assert.AreEqual(typeof(Button), loadedScene.Controls[0].GetType());

		}



		[Test, CloseAfterFirstFrame]

		public void AddingControlAddsToListOfControls()

		{

			Assert.AreEqual(0, scene.Controls.Count);

			var control = new EmptyControl();

			scene.Add(control);

			Assert.AreEqual(1, scene.Controls.Count);

			Assert.AreEqual(control, scene.Controls[0]);

		}



		[Test, CloseAfterFirstFrame]

		public void AddingListOfControl()

		{

			Assert.AreEqual(0, scene.Controls.Count);

			var controls = new List<EmptyControl> { new EmptyControl(), new EmptyControl() };

			scene.Add(controls);

			Assert.AreEqual(2, scene.Controls.Count);

		}



		private class EmptyControl : Entity2D

		{

			public EmptyControl()

				: base(Rectangle.Zero) {}

		}



		[Test, CloseAfterFirstFrame]

		public void AddingControlTwiceOnlyAddsItOnce()

		{

			var control = new EmptyControl();

			scene.Add(control);

			scene.Add(control);

			Assert.AreEqual(1, scene.Controls.Count);

		}



		[Test, CloseAfterFirstFrame]

		public void AddingControlToActiveSceneActivatesIt()

		{

			var label = new Sprite(material, Rectangle.One);

			scene.Show();

			scene.Add(label);

			Assert.IsTrue(label.IsActive);

		}



		[Test, CloseAfterFirstFrame]

		public void AddingControlToInactiveSceneDeactivatesIt()

		{

			var label = new Sprite(material, Rectangle.One) { IsActive = true };

			scene.Hide();

			scene.Add(label);

			Assert.IsFalse(label.IsActive);

		}



		[Test, CloseAfterFirstFrame]

		public void RemovingControlRemovesFromListOfControls()

		{

			var label = new Sprite(material, Rectangle.One);

			scene.Add(label);

			scene.Remove(label);

			Assert.AreEqual(0, scene.Controls.Count);

		}



		[Test, CloseAfterFirstFrame]

		public void RemovingControlDeactivatesIt()

		{

			var label = new Sprite(material, Rectangle.One) { IsActive = true };

			scene.Add(label);

			scene.Remove(label);

			Assert.IsFalse(label.IsActive);

		}



		[Test, CloseAfterFirstFrame]

		public void ClearingControlsDeactivatesThem()

		{

			var label = new Sprite(material, Rectangle.One) { IsActive = true };

			var control = new EmptyControl { IsActive = true };

			scene.Add(label);

			scene.Add(control);

			scene.Clear();

			Assert.AreEqual(0, scene.Controls.Count);

			Assert.IsFalse(label.IsActive);

			Assert.IsFalse(control.IsActive);

		}



		[Test, CloseAfterFirstFrame]

		public void HidingSceneHidesControls()

		{

			var label = new Sprite(material, Rectangle.One) { IsActive = true };

			var control = new EmptyControl { IsActive = true };

			scene.Add(label);

			scene.Add(control);

			scene.Hide();

			scene.Hide();

			Assert.AreEqual(2, scene.Controls.Count);

			Assert.IsFalse(label.IsVisible);

			Assert.IsFalse(control.IsVisible);

		}



		[Test, CloseAfterFirstFrame]

		public void ControlsDoNotRespondToInputWhenSceneIsHidden()

		{

			if (!IsMockResolver)

				return; //ncrunch: no coverage

			var button = CreateButton();

			scene.Add(button);

			scene.Hide();

			SetMouseState(State.Pressing, Vector2D.Half);

			Assert.AreEqual(NormalColor, button.Color);

		}



		private static readonly Color NormalColor = Color.LightGray;



		private static Button CreateButton()

		{

			var theme = new Theme

			{

				Button =

					new Material(ShaderFlags.Position2DColoredTextured, "DeltaEngineLogo")

					{

						DefaultColor = NormalColor

					},

				ButtonMouseover =

					new Material(ShaderFlags.Position2DColoredTextured, "DeltaEngineLogo")

					{

						DefaultColor = MouseoverColor

					},

				ButtonPressed =

					new Material(ShaderFlags.Position2DColoredTextured, "DeltaEngineLogo")

					{

						DefaultColor = PressedColor

					}

			};

			return new Button(theme, Small);

		}



		private static readonly Rectangle Small = Rectangle.FromCenter(0.5f, 0.5f, 0.3f, 0.1f);

		private static readonly Color MouseoverColor = Color.White;

		private static readonly Color PressedColor = Color.Red;



		private void SetMouseState(State state, Vector2D position)

		{

			Resolve<MockMouse>().SetNativePosition(position);

			Resolve<MockMouse>().SetButtonState(MouseButton.Left, state);

			AdvanceTimeAndUpdateEntities();

		}



		[Test, CloseAfterFirstFrame]

		public void ControlsDoNotRespondToInputWhenInBackground()

		{

			if (!IsMockResolver)

				return; //ncrunch: no coverage

			var button = CreateButton();

			scene.Add(button);

			scene.ToBackground();

			SetMouseState(State.Pressing, Vector2D.Half);

			Assert.AreEqual(NormalColor, button.Color);

		}



		[Test, CloseAfterFirstFrame]

		public void ControlsRespondToInputWhenBroughtBackToForeground()

		{

			if (!IsMockResolver)

				return; //ncrunch: no coverage

			var button = CreateButton();

			scene.Add(button);

			scene.ToBackground();

			scene.ToForeground();

			SetMouseState(State.Pressing, Vector2D.Half);

			Assert.AreEqual(PressedColor, button.Color);

		}



		[Test]

		public void DrawButtonWhichChangesColorAndSize()

		{

			if (!IsMockResolver)

				return; //ncrunch: no coverage

			var button = CreateButton();

			button.Start<ChangeSizeDynamically>();

			scene.Add(button);

			AdvanceTimeAndUpdateEntities();

			button.State.IsPressed = true;

		}



		private class ChangeSizeDynamically : UpdateBehavior

		{

			public ChangeSizeDynamically()

				: base(Priority.Low) {}



			public override void Update(IEnumerable<Entity> entities)

			{

				foreach (var entity in entities.OfType<Control>())

					if (entity.State.IsInside && !entity.State.IsPressed)

						entity.Set(Big);

					else

						entity.Set(Small);

			}

		}



		private static readonly Rectangle Big = Rectangle.FromCenter(0.5f, 0.5f, 0.36f, 0.12f);



		[Test, CloseAfterFirstFrame]

		public void ChangeBackgroundImage()

		{

			Assert.AreEqual(0, scene.Controls.Count);

			var background = new Material(ShaderFlags.Position2DColoredTextured,

				"SimpleMainMenuBackground");

			scene.SetQuadraticBackground(background);

			Assert.AreEqual(1, scene.Controls.Count);

			Assert.AreEqual(background, ((Sprite)scene.Controls[0]).Material);

			var logo = new Material(ShaderFlags.Position2DColoredTextured, "DeltaEngineLogo");

			scene.SetQuadraticBackground(logo);

			Assert.AreEqual(1, scene.Controls.Count);

			Assert.AreEqual(logo, ((Sprite)scene.Controls[0]).Material);

		}



		[Test]

		public void BackgroundImageChangesWhenButtonClicked()

		{

			scene.SetQuadraticBackground("SimpleSubMenuBackground");

			var button = CreateButton();

			button.Clicked += () => scene.SetQuadraticBackground("SimpleMainMenuBackground");

			scene.Add(button);

		}



		[Test]

		public void SetQuadraticBackgroundOnSquareWindow()

		{

			window.ViewportPixelSize = new Size(512, 512);

			scene.SetQuadraticBackground("CheckerboardImage512x512");

		}



		[Test]

		public void SetQuadraticBackgroundOnLandscapeWindow()

		{

			window.ViewportPixelSize = new Size(512, 288);

			scene.SetQuadraticBackground("CheckerboardImage512x512");

		}



		[Test]

		public void SetQuadraticBackgroundOnPortraitWindow()

		{

			window.ViewportPixelSize = new Size(288, 512);

			scene.SetQuadraticBackground("CheckerboardImage512x512");

		}



		[Test]

		public void SetLandscapeViewportBackgroundOnLandscapeWindow()

		{

			window.ViewportPixelSize = new Size(512, 288);

			scene.SetViewportBackground("CheckerboardImage512x288");

		}



		[Test]

		public void SetPortraitViewportBackgroundOnPortraitWindow()

		{

			window.ViewportPixelSize = new Size(288, 512);

			scene.SetViewportBackground("CheckerboardImage288x512");

		}



		[Test]

		public void SetChangingViewport()

		{

			window.ViewportPixelSize = new Size(288, 512);

			scene.SetViewportBackground("CheckerboardImage288x512");

			window.ViewportPixelSize = new Size(512, 288);

			scene.SetViewportBackground("CheckerboardImage512x288");

		}



		[Test, CloseAfterFirstFrame]

		public void DisposingSceneClearsIt()

		{

			var loadedScene = ContentLoader.Load<Scene>("SceneWithAButton");

			var button = loadedScene.Controls[0] as Button;

			loadedScene.Dispose();

			Assert.AreEqual(0, loadedScene.Controls.Count);

			Assert.IsFalse(button.IsActive);

		}



		[Test, CloseAfterFirstFrame]

		public void LoadingDisposedSceneRecreatesIt()

		{

			var loadedScene = ContentLoader.Load<Scene>("SceneWithAButton");

			loadedScene.Dispose();

			loadedScene = ContentLoader.Load<Scene>("SceneWithAButton");

			Assert.AreEqual(1, loadedScene.Controls.Count);

			Assert.IsTrue(loadedScene.Controls[0].IsActive);

		}



		[Test]

		public void ClickingFullscreenIconShouldNotCreateInputEvents()

		{

			var button = new Button(Rectangle.One);

			button.Start<ReportMouseState>();

		}



		private class ReportMouseState : UpdateBehavior

		{

			public ReportMouseState(Mouse mouse)

			{

				this.mouse = mouse;

			}



			private readonly Mouse mouse;



			public override void Update(IEnumerable<Entity> buttons)

			{

				foreach (var entity in buttons)

				{

					var button = (Button)entity;

					var state = mouse.GetButtonState(MouseButton.Left);

					if (!button.Contains<State>())

						button.Add(state);

					if (button.Get<State>() == state)

						return;

					button.Text += "\n" + state + " " + mouse.Position; //ncrunch: no coverage start

					button.Set(state);

				} //ncrunch: no coverage end

			}

		}

	}

}