#region ================== Copyright (c) 2007 Pascal vd Heiden

/*
 * Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
 * This program is released under GNU General Public License
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */

#endregion

#region ================== Namespaces

using System;
using System.Collections.Generic;
using CodeImp.DoomBuilder.Map;
using SlimDX.Direct3D9;
using SlimDX;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Data;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.GZBuilder.Data; //mxd

#endregion

namespace CodeImp.DoomBuilder.VisualModes
{
	public abstract class VisualThing : IVisualPickable, ID3DResource, IComparable<VisualThing>
	{
		#region ================== Constants

		protected const int FIXED_RADIUS = 8; //mxd. Used to render things with zero width and radius

		#endregion
		
		#region ================== Variables
		
		// Thing
		private Thing thing;
		
		// Texture
		private ImageData texture;
		
		// Geometry
		private WorldVertex[] vertices;
		private VertexBuffer geobuffer;
		private bool updategeo;
		private int triangles;
		
		// Rendering
		private int renderpass;
		private Matrix orientation;
		private Matrix position;
		private Matrix cagescales;
		private bool billboard;
		private Vector2D pos2d;
		private float cameradistance;
		private int cagecolor;
		protected bool sizeless; //mxd. Used to render visual things with 0 width and height

		// Selected?
		protected bool selected;

		// Disposing
		private bool isdisposed = false;

        //mxd
        private int cameraDistance3D;
        private int thingHeight;
		protected Matrix scale; //mxd. Used in model rendering

        //mxd. light properties
        private DynamicLightType lightType;
        private DynamicLightRenderStyle lightRenderStyle;
        private Color4 lightColor;
        private float lightRadius; //current radius. used in light animation
        private float lightPrimaryRadius;
        private float lightSecondaryRadius;
        private Vector3 position_v3;
        private float lightDelta; //used in light animation
        private Vector3[] boundingBox;
        //gldefs light
        private Vector3 lightOffset;
        private int lightInterval;
        private bool isGldefsLight;
		
		#endregion
		
		#region ================== Properties
		
		internal VertexBuffer GeometryBuffer { get { return geobuffer; } }
		internal bool NeedsUpdateGeo { get { return updategeo; } }
		internal int Triangles { get { return triangles; } }
		internal int RenderPassInt { get { return renderpass; } }
		internal Matrix Orientation { get { return orientation; } }
		internal Matrix Position { get { return position; } }
		internal Matrix CageScales { get { return cagescales; } }
		internal int CageColor { get { return cagecolor; } }
        
        //mxd
        internal int VertexColor { get { return vertices.Length > 0 ? vertices[0].c : 0;} }
		internal Matrix Scale { get { return scale; } }
        public int CameraDistance3D { get { return cameraDistance3D; } }
		public bool Sizeless { get { return sizeless; } }
        public Vector3 Center { 
            get {
                if (isGldefsLight) return position_v3 + lightOffset;
                return new Vector3(position_v3.X, position_v3.Y, position_v3.Z + thingHeight / 2); 
            } 
        }
		public Vector3D CenterV3D { get { return D3DDevice.V3D(Center); } }
        public Vector3 PositionV3 { get { return position_v3; } }
        public Vector3[] BoundingBox { get { return boundingBox; } }
        //mxd. light properties
        public DynamicLightType LightType { get { return lightType; } }
        public float LightRadius { get { return lightRadius; } }
        public DynamicLightRenderStyle LightRenderStyle { get { return lightRenderStyle; } }
        public Color4 LightColor { get { return lightColor; } }

		/// <summary>
		/// Set to True to use billboarding for this thing. When using billboarding,
		/// the geometry will be rotated on the XY plane to face the camera.
		/// </summary>
		public bool Billboard { get { return billboard; } set { billboard = value; } }

		/// <summary>
		/// Returns the Thing that this VisualThing is created for.
		/// </summary>
		public Thing Thing { get { return thing; } }

		/// <summary>
		/// Render pass in which this geometry must be rendered. Default is Solid.
		/// </summary>
		public RenderPass RenderPass { get { return (RenderPass)renderpass; } set { renderpass = (int)value; } }
		
		/// <summary>
		/// Image to use as texture on the geometry.
		/// </summary>
		public ImageData Texture { get { return texture; } set { texture = value; } }

		/// <summary>
		/// Disposed or not?
		/// </summary>
		public bool IsDisposed { get { return isdisposed; } }

		/// <summary>
		/// Selected or not? This is only used by the core to determine what color to draw it with.
		/// </summary>
		public bool Selected { get { return selected; } set { selected = value; } }
		
		#endregion
		
		#region ================== Constructor / Destructor
		
		// Constructor
		public VisualThing(Thing t)
		{
			// Initialize
			this.thing = t;
			this.renderpass = (int)RenderPass.Mask;
			this.billboard = true;
			this.orientation = Matrix.Identity;
			this.position = Matrix.Identity;
			this.cagescales = Matrix.Identity;
			this.scale = Matrix.Identity; //mxd

            //mxd
            lightType = DynamicLightType.NONE;
            lightRenderStyle = DynamicLightRenderStyle.NONE;
            lightPrimaryRadius = -1;
            lightSecondaryRadius = -1;
            lightInterval = -1;
            lightColor = new Color4();
            boundingBox = new Vector3[9];
			
			// Register as resource
			General.Map.Graphics.RegisterResource(this);
		}

		// Disposer
		public virtual void Dispose()
		{
			// Not already disposed?
			if(!isdisposed)
			{
				// Clean up
				if(geobuffer != null) geobuffer.Dispose();
				geobuffer = null;

				// Unregister resource
				General.Map.Graphics.UnregisterResource(this);

				// Done
				isdisposed = true;
			}
		}
		
		#endregion
		
		#region ================== Methods
	
		// This sets the distance from the camera
		internal void CalculateCameraDistance(Vector2D campos)
		{
			cameradistance = Vector2D.DistanceSq(pos2d, campos);
		}

        //mxd
        internal void CalculateCameraDistance3D(Vector3 campos) {
            cameraDistance3D = (int)Vector3.DistanceSquared(PositionV3, campos);
        }
		
		// This is called before a device is reset
		// (when resized or display adapter was changed)
		public void UnloadResource()
		{
			// Trash geometry buffer
			if(geobuffer != null) geobuffer.Dispose();
			geobuffer = null;
			updategeo = true;
		}
		
		// This is called resets when the device is reset
		// (when resized or display adapter was changed)
		public void ReloadResource()
		{
			// Make new geometry
			//Update();
		}

		/// <summary>
		/// Sets the size of the cage around the thing geometry.
		/// </summary>
		public void SetCageSize(float radius, float height)
		{
			cagescales = Matrix.Scaling(radius, radius, height);
            //mxd
            thingHeight = (int)height;
		}

		/// <summary>
		/// Sets the color of the cage around the thing geometry.
		/// </summary>
		public void SetCageColor(PixelColor color)
		{
			cagecolor = color.ToInt();
		}

		/// <summary>
		/// This sets the position to use for the thing geometry.
		/// </summary>
		public void SetPosition(Vector3D pos)
		{
			pos2d = new Vector2D(pos);
            //mxd
            position_v3 = D3DDevice.V3(pos);
            position = Matrix.Translation(position_v3);

            //mxd. update bounding box
            if (thing.IsModel) {
                updateBoundingBoxForModel();
            } else if (lightType != DynamicLightType.NONE && lightRadius > thing.Size) {
                updateBoundingBox(lightRadius, lightRadius * 2);
            } else {
                updateBoundingBox((int)thing.Size, thingHeight);
            }
		}

		/// <summary>
		/// This sets the orientation to use for the thing geometry. When using this, you may want to turn off billboarding.
		/// </summary>
		public void SetOrientation(Vector3D angles)
		{
			orientation = Matrix.RotationYawPitchRoll(angles.z, angles.y, angles.x);
		}
		
		// This sets the vertices for the thing sprite
		protected void SetVertices(ICollection<WorldVertex> verts)
		{
            // Copy vertices
			vertices = new WorldVertex[verts.Count];
			verts.CopyTo(vertices, 0);
			triangles = vertices.Length / 3;
			updategeo = true;
		}

		//mxd
		protected void SetScale(float scaleX, float scaleY) {
			scale = Matrix.Scaling(scaleX, scaleX, scaleY);
		}
		
		// This updates the visual thing
		public virtual void Update()
		{
            // Do we need to update the geometry buffer?
            if (updategeo)
			{
                // Trash geometry buffer
                if (geobuffer != null) geobuffer.Dispose();
                geobuffer = null;

                // Any vertics?
                if (vertices.Length > 0) {
                    // Make a new buffer
                    geobuffer = new VertexBuffer(General.Map.Graphics.Device, WorldVertex.Stride * vertices.Length,
                                                 Usage.WriteOnly | Usage.Dynamic, VertexFormat.None, Pool.Default);

                    // Fill the buffer
                    DataStream bufferstream = geobuffer.Lock(0, WorldVertex.Stride * vertices.Length, LockFlags.Discard);
                    bufferstream.WriteRange(vertices);
                    geobuffer.Unlock();
                    bufferstream.Dispose();
                }

                //mxd. Check if thing is light
                checkLightState();

				// Done
				updategeo = false;
			}
		}

        //mxd
        protected void checkLightState() {
            //mxd. Check if thing is light
            int light_id = Array.IndexOf(GZBuilder.GZGeneral.GZ_LIGHTS, thing.Type);
            if (light_id != -1) {
                isGldefsLight = false;
                lightInterval = -1;
                updateLight(light_id);
                updateBoundingBox(lightRadius, lightRadius * 2);

                //check if we have light from GLDEFS
            } else if (General.Map.Data.GldefsEntries.ContainsKey(thing.Type)) {
                isGldefsLight = true;
                updateGldefsLight();
                updateBoundingBox(lightRadius, lightRadius * 2);
            } else {
                if (thing.IsModel) {
                    updateBoundingBoxForModel();
                } else {
                    updateBoundingBox((int)thing.Size, thingHeight);
                }
                lightType = DynamicLightType.NONE;
                lightRadius = -1;
                lightPrimaryRadius = -1;
                lightSecondaryRadius = -1;
                lightRenderStyle = DynamicLightRenderStyle.NONE;
                lightInterval = -1;
                isGldefsLight = false;
            }
        }

        //used in ColorPicker to update light 
        public void UpdateLight() {
            int light_id = Array.IndexOf(GZBuilder.GZGeneral.GZ_LIGHTS, thing.Type);
            if (light_id != -1) {
                updateLight(light_id);
                updateBoundingBox(lightRadius, lightRadius * 2);
            }
        }

        //mxd update light info
        private void updateLight(int light_id) {
            float scaled_intensity = 255.0f / General.Settings.GZDynamicLightIntensity;

            if (light_id < GZBuilder.GZGeneral.GZ_LIGHT_TYPES[2]) { //if it's gzdoom light
                int n;
                if (light_id < GZBuilder.GZGeneral.GZ_LIGHT_TYPES[0]) {
                    n = 0;
                    lightRenderStyle = DynamicLightRenderStyle.NORMAL;
                    //lightColor.Alpha used in shader to perform some calculations based on light type
                    lightColor = new Color4((float)lightRenderStyle / 100.0f, (float)thing.Args[0] / scaled_intensity, (float)thing.Args[1] / scaled_intensity, (float)thing.Args[2] / scaled_intensity);
                } else if (light_id < GZBuilder.GZGeneral.GZ_LIGHT_TYPES[1]) {
                    n = 10;
                    lightRenderStyle = DynamicLightRenderStyle.ADDITIVE;
                    lightColor = new Color4((float)lightRenderStyle / 100.0f, (float)thing.Args[0] / scaled_intensity, (float)thing.Args[1] / scaled_intensity, (float)thing.Args[2] / scaled_intensity);
                } else {
                    n = 20;
                    lightRenderStyle = DynamicLightRenderStyle.NEGATIVE;
                    lightColor = new Color4((float)lightRenderStyle / 100.0f, (float)thing.Args[0] / scaled_intensity, (float)thing.Args[1] / scaled_intensity, (float)thing.Args[2] / scaled_intensity);
                }
                lightType = (DynamicLightType)(thing.Type - 9800 - n);

                if (lightType == DynamicLightType.SECTOR) {
                    int scaler = 1;
                    if (thing.Sector != null)
                        scaler = thing.Sector.Brightness / 4;
                    lightPrimaryRadius = (float)(thing.Args[3] * scaler) * General.Settings.GZDynamicLightRadius;
                } else {
                    lightPrimaryRadius = (float)(thing.Args[3] * 2) * General.Settings.GZDynamicLightRadius; //works... that.. way in GZDoom
                    if (lightType > 0)
                        lightSecondaryRadius = (float)(thing.Args[4] * 2) * General.Settings.GZDynamicLightRadius;
                }
            } else { //it's one of vavoom lights
                lightRenderStyle = DynamicLightRenderStyle.VAVOOM;
				lightType = (DynamicLightType)thing.Type;
                if (lightType == DynamicLightType.VAVOOM_COLORED)
                    lightColor = new Color4((float)lightRenderStyle / 100.0f, (float)thing.Args[1] / scaled_intensity, (float)thing.Args[2] / scaled_intensity, (float)thing.Args[3] / scaled_intensity);
                else
                    lightColor = new Color4((float)lightRenderStyle / 100.0f, General.Settings.GZDynamicLightIntensity, General.Settings.GZDynamicLightIntensity, General.Settings.GZDynamicLightIntensity);
                lightPrimaryRadius = (float)(thing.Args[0] * 8) * General.Settings.GZDynamicLightRadius;
            }
            UpdateLightRadius();
        }

        //mxd
        private void updateGldefsLight() {
            DynamicLightData light = General.Map.Data.GldefsEntries[thing.Type];
            float intensity_mod = General.Settings.GZDynamicLightIntensity;
            float scale_mod = General.Settings.GZDynamicLightRadius;

            //apply settings
            lightRenderStyle = light.Subtractive ? DynamicLightRenderStyle.NEGATIVE : DynamicLightRenderStyle.NORMAL;
            lightColor = new Color4((float)lightRenderStyle / 100.0f, light.Color.Red * intensity_mod, light.Color.Green * intensity_mod, light.Color.Blue * intensity_mod);
            lightOffset = light.Offset;
            lightType = light.Type;

            if (lightType == DynamicLightType.SECTOR) {
                lightPrimaryRadius = light.Interval * thing.Sector.Brightness / 5;
            } else {
                lightPrimaryRadius = light.PrimaryRadius * scale_mod;
                lightSecondaryRadius = light.SecondaryRadius * scale_mod;
            }

            lightInterval = light.Interval;

            updateLightRadius(lightInterval);
        }

        //mxd
        public void UpdateLightRadius() {
            updateLightRadius( (lightInterval != -1 ? lightInterval : thing.AngleDoom) );
        }

        //mxd
        private void updateLightRadius(int interval) {
            if (lightType == DynamicLightType.NONE) {
                General.ErrorLogger.Add(ErrorType.Error, "Please check that thing is light before accessing it's PositionAndRadius! You can use lightType, which is -1 if thing isn't light");
                return;
            }

            if (!General.Settings.GZAnimateLights || Array.IndexOf(GZBuilder.GZGeneral.GZ_ANIMATED_LIGHT_TYPES, lightType) == -1) {
                lightRadius = lightPrimaryRadius;
                return;
            }

            float time = General.Clock.CurrentTime;
            
            float rMin = Math.Min(lightPrimaryRadius, lightSecondaryRadius);
            float rMax = Math.Max(lightPrimaryRadius, lightSecondaryRadius);
            float diff = rMax - rMin;

            //pulse
            if (lightType == DynamicLightType.PULSE) {
                lightDelta = ((float)Math.Sin(time / (interval * 4.0f)) + 1.0f) / 2.0f; //just playing by the eye here... in [0.0 ... 1.0] interval
                lightRadius = rMin + diff * lightDelta;
            //flicker
            } else if (lightType == DynamicLightType.FLICKER) {
                float delta = (float)Math.Sin(time / 0.1f); //just playing by the eye here...
                if (Math.Sign(delta) != Math.Sign(lightDelta)) {
                    lightDelta = delta;
                    if (new Random().Next(0, 359) < interval) 
                        lightRadius = rMax;
                    else
                        lightRadius = rMin;
                }
            //random
            } else if (lightType == DynamicLightType.RANDOM) {
                float delta = (float)Math.Sin(time / (interval * 9.0f)); //just playing by the eye here...
                if (Math.Sign(delta) != Math.Sign(lightDelta))
                    lightRadius = rMin + (float)(new Random().Next(0, (int)(diff * 10))) / 10.0f;
                lightDelta = delta;
            }
        }

        //mxd. update bounding box
        public void UpdateBoundingBox() {
            //updateBoundingBox(lightRadius, lightRadius * 2f);
            if (thing.IsModel) {
                updateBoundingBoxForModel();
            } else if (lightType != DynamicLightType.NONE && lightRadius > thing.Size) {
                updateBoundingBox(lightRadius, lightRadius * 2);
            } else {
                updateBoundingBox((int)thing.Size, thingHeight);
            }
        }

        private void updateBoundingBox(float width, float height) {
            boundingBox = new Vector3[9];
            boundingBox[0] = Center;
            float h2 = height / 2.0f;

            boundingBox[1] = new Vector3(position_v3.X - width, position_v3.Y - width, Center.Z - h2);
            boundingBox[2] = new Vector3(position_v3.X + width, position_v3.Y - width, Center.Z - h2);
            boundingBox[3] = new Vector3(position_v3.X - width, position_v3.Y + width, Center.Z - h2);
            boundingBox[4] = new Vector3(position_v3.X + width, position_v3.Y + width, Center.Z - h2);

            boundingBox[5] = new Vector3(position_v3.X - width, position_v3.Y - width, Center.Z + h2);
            boundingBox[6] = new Vector3(position_v3.X + width, position_v3.Y - width, Center.Z + h2);
            boundingBox[7] = new Vector3(position_v3.X - width, position_v3.Y + width, Center.Z + h2);
            boundingBox[8] = new Vector3(position_v3.X + width, position_v3.Y + width, Center.Z + h2);
        }

        //mxd. update bounding box from model bounding box
        private void updateBoundingBoxForModel() {
            ModelData mde = General.Map.Data.ModeldefEntries[thing.Type];
            int len = mde.Model.BoundingBox.Length;
            boundingBox = new Vector3[len];
            for (int i = 0; i < len; i++) {
                Vector3 v = mde.Model.BoundingBox[i];
                boundingBox[i] = new Vector3(v.X + position_v3.X, v.Y + position_v3.Y, v.Z + position_v3.Z);
            }    
        }
		
		/// <summary>
		/// This is called when the thing must be tested for line intersection. This should reject
		/// as fast as possible to rule out all geometry that certainly does not touch the line.
		/// </summary>
		public virtual bool PickFastReject(Vector3D from, Vector3D to, Vector3D dir)
		{
			return false;
		}
		
		/// <summary>
		/// This is called when the thing must be tested for line intersection. This should perform
		/// accurate hit detection and set u_ray to the position on the ray where this hits the geometry.
		/// </summary>
		public virtual bool PickAccurate(Vector3D from, Vector3D to, Vector3D dir, ref float u_ray)
		{
			return false;
		}
		
		/// <summary>
		/// This sorts things by distance from the camera. Farthest first.
		/// </summary>
		public int CompareTo(VisualThing other)
		{
			return Math.Sign(other.cameradistance - this.cameradistance);
		}
		
		#endregion
	}
}