#ifndef __TEXTURES_H
#define __TEXTURES_H

#include "doomtype.h"
#include "m_fixed.h"

class FBitmap;
struct FRemapTable;
struct FCopyInfo;
class FScanner;

// Texture IDs
class FTextureManager;
class FTerrainTypeArray;

class FTextureID
{
	friend class FTextureManager;
	friend FArchive &operator<< (FArchive &arc, FTextureID &tex);
	friend FTextureID GetHUDIcon(const PClass *cls);
	friend void R_InitSpriteDefs ();

public:
	FTextureID() throw() {}
	bool isNull() const { return texnum == 0; }
	bool isValid() const { return texnum > 0; }
	bool Exists() const { return texnum >= 0; }
	void SetInvalid() { texnum = -1; }
	bool operator ==(const FTextureID &other) const { return texnum == other.texnum; }
	bool operator !=(const FTextureID &other) const { return texnum != other.texnum; }
	FTextureID operator +(int offset) throw();
	int GetIndex() const { return texnum; }	// Use this only if you absolutely need the index!

	// The switch list needs these to sort the switches by texture index
	int operator -(FTextureID other) const { return texnum - other.texnum; }
	bool operator < (FTextureID other) const { return texnum < other.texnum; }
	bool operator > (FTextureID other) const { return texnum > other.texnum; }
	
protected:
	FTextureID(int num) { texnum = num; }
private:
	int texnum;
};

class FNullTextureID : public FTextureID
{
public:
	FNullTextureID() : FTextureID(0) {}
};

FArchive &operator<< (FArchive &arc, FTextureID &tex);


// Patches.
// A patch holds one or more columns.
// Patches are used for sprites and all masked pictures, and we compose
// textures from the TEXTURE1/2 lists of patches.
struct patch_t
{ 
	SWORD			width;			// bounding box size 
	SWORD			height; 
	SWORD			leftoffset; 	// pixels to the left of origin 
	SWORD			topoffset;		// pixels below the origin 
	DWORD 			columnofs[8];	// only [width] used
	// the [0] is &columnofs[width] 
};

class FileReader;

// All FTextures present their data to the world in 8-bit format, but if
// the source data is something else, this is it.
enum FTextureFormat
{
	TEX_Pal,
	TEX_Gray,
	TEX_RGB,		// Actually ARGB
	TEX_DXT1,
	TEX_DXT2,
	TEX_DXT3,
	TEX_DXT4,
	TEX_DXT5,
};

class FNativeTexture;

// Base texture class
class FTexture
{
public:
	static FTexture *CreateTexture(int lumpnum, int usetype);
	virtual ~FTexture ();

	SWORD LeftOffset, TopOffset;

	BYTE WidthBits, HeightBits;

	fixed_t		xScale;
	fixed_t		yScale;

	char Name[9];
	BYTE UseType;	// This texture's primary purpose

	BYTE bNoDecals:1;		// Decals should not stick to texture
	BYTE bNoRemap0:1;		// Do not remap color 0 (used by front layer of parallax skies)
	BYTE bWorldPanning:1;	// Texture is panned in world units rather than texels
	BYTE bMasked:1;			// Texture (might) have holes
	BYTE bAlphaTexture:1;	// Texture is an alpha channel without color information
	BYTE bHasCanvas:1;		// Texture is based off FCanvasTexture
	BYTE bWarped:2;			// This is a warped texture. Used to avoid multiple warps on one texture
	BYTE bComplex:1;		// Will be used to mark extended MultipatchTextures that have to be
							// fully composited before subjected to any kinf of postprocessing instead of
							// doing it per patch.

	WORD Rotations;

	enum // UseTypes
	{
		TEX_Any,
		TEX_Wall,
		TEX_Flat,
		TEX_Sprite,
		TEX_WallPatch,
		TEX_Build,
		TEX_SkinSprite,
		TEX_Decal,
		TEX_MiscPatch,
		TEX_FontChar,
		TEX_Override,	// For patches between TX_START/TX_END
		TEX_Autopage,	// Automap background - used to enable the use of FAutomapTexture
		TEX_Null,
		TEX_FirstDefined,
	};

	struct Span
	{
		WORD TopOffset;
		WORD Length;	// A length of 0 terminates this column
	};

	// Returns a single column of the texture
	virtual const BYTE *GetColumn (unsigned int column, const Span **spans_out) = 0;

	// Returns the whole texture, stored in column-major order
	virtual const BYTE *GetPixels () = 0;
	
	virtual int CopyTrueColorPixels(FBitmap *bmp, int x, int y, int rotate=0, FCopyInfo *inf = NULL);
	int CopyTrueColorTranslated(FBitmap *bmp, int x, int y, int rotate, FRemapTable *remap, FCopyInfo *inf = NULL);
	virtual bool UseBasePalette();
	virtual int GetSourceLump() { return -1; }

	virtual void Unload () = 0;

	// Returns the native pixel format for this image
	virtual FTextureFormat GetFormat();

	// Returns a native 3D representation of the texture
	FNativeTexture *GetNative(bool wrapping);

	// Frees the native 3D representation of the texture
	void KillNative();

	// Fill the native texture buffer with pixel data for this image
	virtual void FillBuffer(BYTE *buff, int pitch, int height, FTextureFormat fmt);

	int GetWidth () { return Width; }
	int GetHeight () { return Height; }

	int GetScaledWidth () { int foo = (Width << 17) / xScale; return (foo >> 1) + (foo & 1); }
	int GetScaledHeight () { int foo = (Height << 17) / yScale; return (foo >> 1) + (foo & 1); }

	int GetScaledLeftOffset () { int foo = (LeftOffset << 17) / xScale; return (foo >> 1) + (foo & 1); }
	int GetScaledTopOffset () { int foo = (TopOffset << 17) / yScale; return (foo >> 1) + (foo & 1); }

	virtual void SetFrontSkyLayer();

	void CopyToBlock (BYTE *dest, int dwidth, int dheight, int x, int y, const BYTE *translation=NULL)
	{
		CopyToBlock(dest, dwidth, dheight, x, y, 0, translation);
	}

	void CopyToBlock (BYTE *dest, int dwidth, int dheight, int x, int y, int rotate, const BYTE *translation=NULL);

	// Returns true if the next call to GetPixels() will return an image different from the
	// last call to GetPixels(). This should be considered valid only if a call to CheckModified()
	// is immediately followed by a call to GetPixels().
	virtual bool CheckModified ();

	static void InitGrayMap();

	void CopySize(FTexture *BaseTexture)
	{
		Width = BaseTexture->GetWidth();
		Height = BaseTexture->GetHeight();
		TopOffset = BaseTexture->TopOffset;
		LeftOffset = BaseTexture->LeftOffset;
		WidthBits = BaseTexture->WidthBits;
		HeightBits = BaseTexture->HeightBits;
		xScale = BaseTexture->xScale;
		yScale = BaseTexture->yScale;
		WidthMask = (1 << WidthBits) - 1;
	}

	void SetScaledSize(int fitwidth, int fitheight)
	{
		xScale = DivScale16(Width, fitwidth);
		yScale = DivScale16(Height,fitheight);
		// compensate for roundoff errors
		if (MulScale16(xScale, fitwidth) != Width) xScale++;
		if (MulScale16(yScale, fitheight) != Height) yScale++;
	}

	virtual void HackHack (int newheight);	// called by FMultipatchTexture to discover corrupt patches.

protected:
	WORD Width, Height, WidthMask;
	static BYTE GrayMap[256];
	FNativeTexture *Native;

	FTexture ();

	Span **CreateSpans (const BYTE *pixels) const;
	void FreeSpans (Span **spans) const;
	void CalcBitSize ();

	static void FlipSquareBlock (BYTE *block, int x, int y);
	static void FlipSquareBlockRemap (BYTE *block, int x, int y, const BYTE *remap);
	static void FlipNonSquareBlock (BYTE *blockto, const BYTE *blockfrom, int x, int y, int srcpitch);
	static void FlipNonSquareBlockRemap (BYTE *blockto, const BYTE *blockfrom, int x, int y, int srcpitch, const BYTE *remap);

	friend class D3DTex;
};


// Texture manager
class FTextureManager
{
public:
	FTextureManager ();
	~FTextureManager ();

	// Get texture without translation
	FTexture *operator[] (FTextureID texnum)
	{
		if ((unsigned)texnum.GetIndex() >= Textures.Size()) return NULL;
		return Textures[texnum.GetIndex()].Texture;
	}
	FTexture *operator[] (const char *texname)
	{
		FTextureID texnum = GetTexture (texname, FTexture::TEX_MiscPatch);
		if (!texnum.Exists()) return NULL;
		return Textures[texnum.GetIndex()].Texture;
	}
	FTexture *ByIndex(int i)
	{
		if (unsigned(i) >= Textures.Size()) return NULL;
		return Textures[i].Texture;
	}
	FTexture *FindTexture(const char *texname, int usetype = FTexture::TEX_MiscPatch, BITFIELD flags = TEXMAN_TryAny);

	// Get texture with translation
	FTexture *operator() (FTextureID texnum)
	{
		if ((size_t)texnum.texnum >= Textures.Size()) return NULL;
		return Textures[Translation[texnum.texnum]].Texture;
	}
	FTexture *operator() (const char *texname)
	{
		FTextureID texnum = GetTexture (texname, FTexture::TEX_MiscPatch);
		if (texnum.texnum==-1) return NULL;
		return Textures[Translation[texnum.texnum]].Texture;
	}

	void SetTranslation (FTextureID fromtexnum, FTextureID totexnum)
	{
		if ((size_t)fromtexnum.texnum < Translation.Size())
		{
			if ((size_t)totexnum.texnum >= Textures.Size())
			{
				totexnum.texnum = fromtexnum.texnum;
			}
			Translation[fromtexnum.texnum] = totexnum.texnum;
		}
	}

	enum
	{
		TEXMAN_TryAny = 1,
		TEXMAN_Overridable = 2,
		TEXMAN_ReturnFirst = 4,
	};

	FTextureID CheckForTexture (const char *name, int usetype, BITFIELD flags=TEXMAN_TryAny);
	FTextureID GetTexture (const char *name, int usetype, BITFIELD flags=0);
	int ListTextures (const char *name, TArray<FTextureID> &list);

	void AddTexturesLump (const void *lumpdata, int lumpsize, int deflumpnum, int patcheslump, int firstdup=0, bool texture1=false);
	void AddTexturesLumps (int lump1, int lump2, int patcheslump);
	void AddGroup(int wadnum, const char * startlump, const char * endlump, int ns, int usetype);
	void AddPatches (int lumpnum);
	void AddTiles (void *tileFile);
	void AddHiresTextures (int wadnum);
	void LoadTextureDefs(int wadnum, const char *lumpname);
	void ParseXTexture(FScanner &sc, int usetype);
	void SortTexturesByType(int start, int end);

	FTextureID CreateTexture (int lumpnum, int usetype=FTexture::TEX_Any);	// Also calls AddTexture
	FTextureID AddTexture (FTexture *texture);
	FTextureID AddPatch (const char *patchname, int namespc=0, bool tryany = false);

	void LoadTextureX(int wadnum);
	void AddTexturesForWad(int wadnum);
	void Init();

	// Replaces one texture with another. The new texture will be assigned
	// the same name, slot, and use type as the texture it is replacing.
	// The old texture will no longer be managed. Set free true if you want
	// the old texture to be deleted or set it false if you want it to
	// be left alone in memory. You will still need to delete it at some
	// point, because the texture manager no longer knows about it.
	// This function can be used for such things as warping textures.
	void ReplaceTexture (FTextureID picnum, FTexture *newtexture, bool free);

	void UnloadAll ();

	int NumTextures () const { return (int)Textures.Size(); }

	void WriteTexture (FArchive &arc, int picnum);
	int ReadTexture (FArchive &arc);


private:
	struct TextureHash
	{
		FTexture *Texture;
		int HashNext;
	};
	enum { HASH_END = -1, HASH_SIZE = 1027 };
	TArray<TextureHash> Textures;
	TArray<int> Translation;
	int HashFirst[HASH_SIZE];
	FTextureID DefaultTexture;
};

extern FTextureManager TexMan;

#endif