#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 System.Drawing;
using System.Drawing.Imaging;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.IO;
using System.IO;

#endregion

namespace CodeImp.DoomBuilder.Data
{
	internal sealed unsafe class HighResImage : ImageData
	{
		#region ================== Variables

		private List<TexturePatch> patches;
		private bool gotFullName;//mxd
		
		#endregion

		#region ================== Constructor / Disposer

		// Constructor
		public HighResImage(string name, int width, int height, float scalex, float scaley, bool worldpanning)
		{
			// Initialize
			this.width = width;
			this.height = height;
			this.scale.x = scalex;
			this.scale.y = scaley;
			this.worldpanning = worldpanning;
			this.patches = new List<TexturePatch>();
			SetName(name);
			
			// We have no destructor
			GC.SuppressFinalize(this);
		}

		#endregion

		#region ================== Methods

		// This adds a patch to the texture
		public void AddPatch(TexturePatch patch)
		{
			// Add it
			patches.Add(patch);

			//mxd. Get full name from first patch
			if (!gotFullName) {
				fullName = General.Map.Data.GetPatchLocation(patch.lumpname);
				gotFullName = true;
			}
		}
		
		// This loads the image
		protected override void LocalLoadImage()
		{
			IImageReader reader;
			MemoryStream mem;
			byte[] membytes;
			Graphics g = null;
			
			// Checks
			if(this.IsImageLoaded) return;
			if((width == 0) || (height == 0)) return;
			
			lock(this)
			{
				// Create texture bitmap
				try
				{
					if(bitmap != null) bitmap.Dispose();
					bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
					BitmapData bitmapdata = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
					PixelColor* pixels = (PixelColor*)bitmapdata.Scan0.ToPointer();
					General.ZeroMemory(new IntPtr(pixels), width * height * sizeof(PixelColor));
					bitmap.UnlockBits(bitmapdata);
					g = Graphics.FromImage(bitmap);
				}
				catch(Exception e)
				{
					// Unable to make bitmap
					General.ErrorLogger.Add(ErrorType.Error, "Unable to load texture image '" + this.Name + "'. " + e.GetType().Name + ": " + e.Message);
					loadfailed = true;
				}

				int failCount = 0; //mxd

				if(!loadfailed)
				{
					// Go for all patches
					foreach(TexturePatch p in patches)
					{
						// Get the patch data stream
						Stream patchdata = General.Map.Data.GetPatchData(p.lumpname);
						if(patchdata != null)
						{
							// Copy patch data to memory
							patchdata.Seek(0, SeekOrigin.Begin);
							membytes = new byte[(int)patchdata.Length];
							patchdata.Read(membytes, 0, (int)patchdata.Length);
							mem = new MemoryStream(membytes);
							mem.Seek(0, SeekOrigin.Begin);

							// Get a reader for the data
							reader = ImageDataFormat.GetImageReader(mem, ImageDataFormat.DOOMPICTURE, General.Map.Data.Palette);
							if(reader is UnknownImageReader)
							{
								//mxd. Probably that's a flat?..
								if (General.Map.Config.MixTexturesFlats) {
									reader = ImageDataFormat.GetImageReader(mem, ImageDataFormat.DOOMFLAT, General.Map.Data.Palette);
								}
								if (reader is UnknownImageReader) {
									// Data is in an unknown format!
									General.ErrorLogger.Add(ErrorType.Error, "Patch lump '" + p.lumpname + "' data format could not be read, while loading texture '" + this.Name + "'");
									failCount++; //mxd
								}
							}

							if(!(reader is UnknownImageReader)) {
								// Get the patch
								mem.Seek(0, SeekOrigin.Begin);
								Bitmap patchbmp = null;
								try { patchbmp = reader.ReadAsBitmap(mem); }
								catch(InvalidDataException)
								{
									// Data cannot be read!
									General.ErrorLogger.Add(ErrorType.Error, "Patch lump '" + p.lumpname + "' data format could not be read, while loading texture '" + this.Name + "'");
									failCount++; //mxd
								}
								if(patchbmp != null)
								{
									//mxd. Flip
									if(p.flipx || p.flipy) {
										RotateFlipType flip;
										if(p.flipx && !p.flipy)
											flip = RotateFlipType.RotateNoneFlipX;
										else if(!p.flipx && p.flipy)
											flip = RotateFlipType.RotateNoneFlipY;
										else
											flip = RotateFlipType.RotateNoneFlipXY;
										patchbmp.RotateFlip(flip);
									}

									//mxd. Then rotate. I do it this way because RotateFlip function rotates THEN flips, and GZDoom does it the other way around.
									if(p.rotate != 0) {
										RotateFlipType rotate;
										if(p.rotate == 90)
											rotate = RotateFlipType.Rotate90FlipNone;
										else if(p.rotate == 180)
											rotate = RotateFlipType.Rotate180FlipNone;
										else
											rotate = RotateFlipType.Rotate270FlipNone;
										patchbmp.RotateFlip(rotate);
									}
									
									// Adjust patch alpha, apply tint or blend
									if(p.blendstyle != TexturePathBlendStyle.None || p.style != TexturePathRenderStyle.Copy)
									{
										BitmapData bmpdata = null;

										try
										{
											bmpdata = patchbmp.LockBits(new Rectangle(0, 0, patchbmp.Size.Width, patchbmp.Size.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
										}
										catch(Exception e)
										{
											General.ErrorLogger.Add(ErrorType.Error, "Cannot lock image '" + p.lumpname + "' for alpha adjustment. " + e.GetType().Name + ": " + e.Message);
										}

										if(bmpdata != null)
										{
											PixelColor* pixels = (PixelColor*)(bmpdata.Scan0.ToPointer());
											int numpixels = bmpdata.Width * bmpdata.Height;

											//mxd. Blend/Tint support
											if(p.blendstyle == TexturePathBlendStyle.Blend) {
												float br = p.blend.r * PixelColor.BYTE_TO_FLOAT;
												float bg = p.blend.g * PixelColor.BYTE_TO_FLOAT;
												float bb = p.blend.b * PixelColor.BYTE_TO_FLOAT;

												for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
													cp->r = (byte)(((cp->r * PixelColor.BYTE_TO_FLOAT) * br) * 255.0f);
													cp->g = (byte)(((cp->g * PixelColor.BYTE_TO_FLOAT) * bg) * 255.0f);
													cp->b = (byte)(((cp->b * PixelColor.BYTE_TO_FLOAT) * bb) * 255.0f);
												}
											} else if(p.blendstyle == TexturePathBlendStyle.Tint) {
												float tintammount = p.tintammount - 0.1f;

												if(tintammount > 0) {
													float br = p.blend.r * PixelColor.BYTE_TO_FLOAT * tintammount;
													float bg = p.blend.g * PixelColor.BYTE_TO_FLOAT * tintammount;
													float bb = p.blend.b * PixelColor.BYTE_TO_FLOAT * tintammount;
													float invTint = 1.0f - tintammount;

													for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
														cp->r = (byte)(((cp->r * PixelColor.BYTE_TO_FLOAT) * invTint + br) * 255.0f);
														cp->g = (byte)(((cp->g * PixelColor.BYTE_TO_FLOAT) * invTint + bg) * 255.0f);
														cp->b = (byte)(((cp->b * PixelColor.BYTE_TO_FLOAT) * invTint + bb) * 255.0f);
													}
												}
											}

											//mxd. apply RenderStyle
											if(p.style == TexturePathRenderStyle.Blend) {
												for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--)
													cp->a = (byte)(((cp->a * PixelColor.BYTE_TO_FLOAT) * p.alpha) * 255.0f);

											//mxd. we need a copy of underlying part of texture for these styles
											} else if(p.style != TexturePathRenderStyle.Copy) {
												//copy portion of texture
												int lockWidth = (p.x + patchbmp.Size.Width > bitmap.Width) ? bitmap.Width - p.x : patchbmp.Size.Width;
												int lockHeight = (p.y + patchbmp.Size.Height > bitmap.Height) ? bitmap.Height - p.y : patchbmp.Size.Height;

												Bitmap source = new Bitmap(patchbmp.Size.Width, patchbmp.Size.Height);
												using(Graphics sg = Graphics.FromImage(source))
													sg.DrawImageUnscaled(bitmap, new Rectangle(-p.x, -p.y, lockWidth, lockHeight));
												
												//lock texture
												BitmapData texturebmpdata = null;
												
												try {
													texturebmpdata = source.LockBits(new Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
												} catch(Exception e) {
													General.ErrorLogger.Add(ErrorType.Error, "Cannot lock texture '" + this.Name + "' to apply render style. " + e.GetType().Name + ": " + e.Message);
												}

												if(texturebmpdata != null) {
													PixelColor* texturepixels = (PixelColor*)(texturebmpdata.Scan0.ToPointer());
													PixelColor* tcp = texturepixels + numpixels - 1;

													if(p.style == TexturePathRenderStyle.Add) {
														for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
															cp->r = (byte)Math.Min(255, (int)cp->r + (int)tcp->r);
															cp->g = (byte)Math.Min(255, (int)cp->g + (int)tcp->g);
															cp->b = (byte)Math.Min(255, (int)cp->b + (int)tcp->b);
															cp->a = (byte)((((float)cp->a * PixelColor.BYTE_TO_FLOAT) * p.alpha) * 255.0f);
															tcp--;
														}
													} else if(p.style == TexturePathRenderStyle.Subtract) {
														for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
															cp->r = (byte)Math.Max(0, (int)tcp->r - (int)cp->r);
															cp->g = (byte)Math.Max(0, (int)tcp->g - (int)cp->g);
															cp->b = (byte)Math.Max(0, (int)tcp->b - (int)cp->b);
															cp->a = (byte)((((float)cp->a * PixelColor.BYTE_TO_FLOAT) * p.alpha) * 255.0f);
															tcp--;
														}
													} else if(p.style == TexturePathRenderStyle.ReverseSubtract) {
														for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
															cp->r = (byte)Math.Max(0, (int)cp->r - (int)tcp->r);
															cp->g = (byte)Math.Max(0, (int)cp->g - (int)tcp->g);
															cp->b = (byte)Math.Max(0, (int)cp->b - (int)tcp->b);
															cp->a = (byte)((((float)cp->a * PixelColor.BYTE_TO_FLOAT) * p.alpha) * 255.0f);
															tcp--;
														}
													}else if(p.style == TexturePathRenderStyle.Modulate){
														for(PixelColor* cp = pixels + numpixels - 1; cp >= pixels; cp--) {
															float pr = (float)cp->r * PixelColor.BYTE_TO_FLOAT;
															float pg = (float)cp->g * PixelColor.BYTE_TO_FLOAT;
															float pb = (float)cp->b * PixelColor.BYTE_TO_FLOAT;

															float tr = (float)tcp->r * PixelColor.BYTE_TO_FLOAT;
															float tg = (float)tcp->g * PixelColor.BYTE_TO_FLOAT;
															float tb = (float)tcp->b * PixelColor.BYTE_TO_FLOAT;

															cp->r = (byte)((pr * tr) * 255.0f);
															cp->g = (byte)((pg * tg) * 255.0f);
															cp->b = (byte)((pb * tb) * 255.0f);

															tcp--;
														}
													}

													source.UnlockBits(texturebmpdata);
												}
											}
											patchbmp.UnlockBits(bmpdata);
										}
									}
									
									// Draw the patch on the texture image
									Rectangle tgtrect = new Rectangle(p.x, p.y, patchbmp.Size.Width, patchbmp.Size.Height);
									g.DrawImageUnscaledAndClipped(patchbmp, tgtrect);
									patchbmp.Dispose();
								}
							}

							// Done
							mem.Dispose();
						}
						else
						{
							// Missing a patch lump!
							General.ErrorLogger.Add(ErrorType.Error, "Missing patch lump '" + p.lumpname + "' while loading texture '" + this.Name + "'");
							failCount++; //mxd
						}
					}
				}
				
				// Dispose bitmap if load failed
				if((bitmap != null) && (loadfailed || failCount >= patches.Count)) //mxd. We can still display texture if at least one of the patches was loaded
				{
					bitmap.Dispose();
					bitmap = null;
					loadfailed = true;
				}

				// Pass on to base
				base.LocalLoadImage();
			}
		}

		#endregion
	}
}