/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
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 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *
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 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */
#include <Script.h>

#include "prtypes.h"
#include "nsUnicodeBlock.h"
#include "nsDebug.h"
#include "nscore.h"
#include "nsIPref.h"

class nsUnicodeFontMappingCache;
class nsString;

 //--------------------------------------------------------------------------
typedef enum {
 kSerif  = 0,
 kSansSerif,
 kMonospace,
 kCursive,
 kFantasy, 
 kUknownGenericFontName
} nsGenericFontNameType;
//--------------------------------------------------------------------------

class nsUnicodeMappingUtil {
public:
	nsUnicodeMappingUtil();
	~nsUnicodeMappingUtil();
	void Init();
	void CleanUp();
	void Reset();
	inline PRBool ScriptEnabled(ScriptCode script) 
		{ return (0 != (mScriptEnabled & (1L << script))); };
	inline ScriptCode BlockToScript(nsUnicodeBlock blockID) 
		{ 
			NS_PRECONDITION(blockID < kUnicodeBlockSize, "illegal value");
			return (ScriptCode) mBlockToScriptMapping[blockID]; 
		};
	inline short ScriptFont(ScriptCode script) 
		{ 
			NS_PRECONDITION(script < smPseudoTotalScripts, "bad script code");
			return  mScriptFontMapping[script]; 
		};		
	nsGenericFontNameType MapGenericFontNameType(const nsString& aGenericName);
	inline nsString* GenericFontNameForScript(ScriptCode aScript, nsGenericFontNameType aType) const 
	{
			NS_PRECONDITION(aScript < smPseudoTotalScripts, "bad script code");
			NS_PRECONDITION(aType <= kUknownGenericFontName, "illegal value");
			if( aType >= kUknownGenericFontName)
				return nsnull;
			else
				return mGenericFontMapping[aScript][aType]; 
	}
    inline nsUnicodeFontMappingCache* GetFontMappingCache() { return mCache; };
	
  ScriptCode MapLangGroupToScriptCode(const char* aLangGroup);
	static nsUnicodeMappingUtil* GetSingleton();
	static void FreeSingleton();
	nsString *mGenericFontMapping[smPseudoTotalScripts][kUknownGenericFontName];
	
protected:
	void InitScriptEnabled();
    void InitGenericFontMapping();
    void InitBlockToScriptMapping();
    void InitScriptFontMapping();
    void InitFromPref();
   
  static int  PR_CALLBACK_DECL PrefChangedCallback( const char* aPrefName, void* instance_data);
  static void PR_CALLBACK_DECL PrefEnumCallback(const char* aName, void* aClosure);
    
private:
	PRUint32 mScriptEnabled;
	short 	 mScriptFontMapping[smPseudoTotalScripts];
	PRInt8   mBlockToScriptMapping[kUnicodeBlockSize];
	nsUnicodeFontMappingCache*	mCache;
	nsCOMPtr<nsIPref> mPref;
	
	static nsUnicodeMappingUtil* gSingleton;

};