using System.Collections.Generic;

using Delta.ContentSystem.Rendering;

using Delta.Engine;

using Delta.InputSystem;

using Delta.Rendering.Basics.Drawing;

using Delta.Rendering.Basics.Fonts;

using Delta.Rendering.Cameras;

using Delta.Rendering.Models;

using Delta.Utilities;

using Delta.Utilities.Datatypes;

using Delta.Utilities.Datatypes.Advanced;

using NUnit.Framework;



namespace Delta.Rendering.ModelTests

{

	/// <summary>

	/// Model viewer

	/// </summary>

	[Category("Visual")]

	internal class ModelViewer

	{

		#region Start (Static)

		/// <summary>

		/// Start

		/// </summary>

		[Test]

		public static void Start()

		{

			ModelViewer demo = new ModelViewer();



			// Start up the scene

			Application.Start(delegate

			{

				demo.Run();

			});

		}

		#endregion



		#region Private



		#region meshes (Private)

		/// <summary>

		/// The list of all meshes which are available by the content system.

		/// </summary>

		private readonly List<Mesh> meshes;

		#endregion



		#region currentMeshSelectionIndex (Private)

		/// <summary>

		/// The current index for the mesh (of the "meshes" list) that we draw 

		/// </summary>

		private int currentMeshSelectionIndex;

		#endregion



		#region groundMesh (Private)

		/// <summary>

		/// Mesh for the ground for the rest of the models to stand on.

		/// </summary>

		private Mesh groundMesh = null;

		#endregion



		#region wasTouchPressed (Private)

		/// <summary>

		/// Was touch pressed

		/// </summary>

		private bool wasTouchPressed;

		#endregion



		#endregion



		#region Constructors

		/// <summary>

		/// Create model viewer

		/// </summary>

		public ModelViewer()

		{

			meshes = new List<Mesh>();



			new LookAtCamera(new Vector(0, -5, 5));



			// Set the light direction (copied from the level data)

			//Note: Added 100 to Z to make light come more from the top, looks

			// better for most normal mapping surfaces!

			Light.Direction = new Vector(-161.771f, -52.202f, 25 + 84.163f);

			Light.Direction.Normalize();

			string[] contentNames = MeshData.GetAllContentNames();

			foreach (string name in contentNames)

			{

				meshes.Add(new Mesh(name));

			}

			if (contentNames.Length == 0)

			{

				Log.Warning("There are no mesh files in the Content! " +

				            "Only adding default box now. Make sure to add some meshes " +

				            "to the Content!");

				meshes.Add(Mesh.CreateBox("", 5, 5, 5, MaterialData.Default));

			}

			currentMeshSelectionIndex = 0;

		}

		#endregion



		#region Run (Public)

		/// <summary>

		/// Run

		/// </summary>

		[Test]

		public void Run()

		{

			if (Input.Keyboard.SpaceReleased ||

			    wasTouchPressed &&

			    Input.Touch.TouchIsPressed == false)

			{

				currentMeshSelectionIndex++;

				currentMeshSelectionIndex %= meshes.Count;

			}

			wasTouchPressed = Input.Touch.TouchIsPressed;



			Mesh currentMesh = meshes[currentMeshSelectionIndex];

			currentMesh.Draw();



			Font.DrawTopLeftInformation(

				"Modelname: " + currentMesh.Name + "\n" +

			  "Material: " + currentMesh.Material);



			// If no ground mesh was found, just display the grid

			if (groundMesh == null)

			{

				Grid.Draw();

			}

			else

			{

				groundMesh.Draw();

			}

		}

		#endregion

	}

}