/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version 1.1 (the "License"); you may not use this file except in
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 *
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 * 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 
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 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *
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 * 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"),
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#include "nsCarbonHelpers.h"

#include "nsFontMetricsMac.h"
#include "nsDeviceContextMac.h"
#include "nsUnicodeFontMappingMac.h"
#include "nsUnicodeMappingUtil.h"
#include "nsGfxUtils.h"
#include "nsFontUtils.h"

#define BAD_FONT_NUM	-1


nsFontMetricsMac :: nsFontMetricsMac()
{
  NS_INIT_REFCNT();
  mFont = nsnull;
  mFontNum = BAD_FONT_NUM;
  mFontMapping = nsnull;
}
  
nsFontMetricsMac :: ~nsFontMetricsMac()
{
  if (nsnull != mFont)
  {
    delete mFont;
    mFont = nsnull;
  }
  if (mContext) {
    // Notify our device context that owns us so that it can update its font cache
    mContext->FontMetricsDeleted(this);
    mContext = nsnull;
  }
}

//------------------------------------------------------------------------

NS_IMPL_ISUPPORTS1(nsFontMetricsMac, nsIFontMetrics)


NS_IMETHODIMP nsFontMetricsMac::Init(const nsFont& aFont, nsIAtom* aLangGroup, nsIDeviceContext* aCX)
{
  NS_ASSERTION(!(nsnull == aCX), "attempt to init fontmetrics with null device context");

  mFont = new nsFont(aFont);
  mLangGroup = aLangGroup;
  mContext = aCX;
  RealizeFont();
	
	TextStyle		theStyle;
	nsFontUtils::GetNativeTextStyle(*this, *mContext, theStyle);
	
  StTextStyleSetter styleSetter(theStyle);
  
  FontInfo fInfo;
  GetFontInfo(&fInfo);
  
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);

  mLeading    = NSToCoordRound(float(fInfo.leading) * dev2app);
  mEmAscent   = NSToCoordRound(float(fInfo.ascent) * dev2app);
  mEmDescent  = NSToCoordRound(float(fInfo.descent) * dev2app);
  mEmHeight   = mEmAscent + mEmDescent;

	mMaxHeight  = mEmHeight + mLeading;
  mMaxAscent  = mEmAscent;
  mMaxDescent = mEmDescent;

  mMaxAdvance = NSToCoordRound(float(::CharWidth('M')) * dev2app);	// don't use fInfo.widMax here
  mSpaceWidth = NSToCoordRound(float(::CharWidth(' ')) * dev2app);

  return NS_OK;
}

nsUnicodeFontMappingMac* nsFontMetricsMac::GetUnicodeFontMapping()
{
  if (!mFontMapping)
  {
  	// we should pass the documentCharset from the nsIDocument level and
  	// the lang attribute from the tag level to here.
  	// XXX hard code to some value till peterl pass them down.
  	nsAutoString langGroup;
  	if (mLangGroup)
  		mLangGroup->ToString(langGroup);
    else
      langGroup.Assign(NS_LITERAL_STRING("ja"));
      
  	nsString lang;
  	mFontMapping = nsUnicodeFontMappingMac::GetCachedInstance(mFont, mContext, langGroup, lang);
  }
  
	return mFontMapping;
}


static void MapGenericFamilyToFont(const nsString& aGenericFamily, nsString& aFontFace, ScriptCode aScriptCode)
{
  // the CSS generic names (conversions from the old Mac Mozilla code for now)
  nsUnicodeMappingUtil* unicodeMappingUtil = nsUnicodeMappingUtil::GetSingleton();
  if (unicodeMappingUtil)
  {
    nsString*   foundFont = unicodeMappingUtil->GenericFontNameForScript(
          aScriptCode,
          unicodeMappingUtil->MapGenericFontNameType(aGenericFamily));
    if (foundFont)
    {
      aFontFace = *foundFont;
      return;
    }
  }
  
  NS_ASSERTION(0, "Failed to find a font");
  aFontFace.Assign(NS_LITERAL_STRING("Times"));
	
  /*
  // fall back onto hard-coded font names
  if (aGenericFamily.EqualsIgnoreCase("serif"))
  {
    aFontFace.Assign(NS_LITERAL_STRING("Times"));
  }
  else if (aGenericFamily.EqualsIgnoreCase("sans-serif"))
  {
    aFontFace.Assign(NS_LITERAL_STRING("Helvetica"));
  }
  else if (aGenericFamily.EqualsIgnoreCase("cursive"))
  {
     aFontFace.Assign(NS_LITERAL_STRING("Apple Chancery"));
  }
  else if (aGenericFamily.EqualsIgnoreCase("fantasy"))
  {
    aFontFace.Assign(NS_LITERAL_STRING("Gadget"));
  }
  else if (aGenericFamily.EqualsIgnoreCase("monospace"))
  {
    aFontFace.Assign(NS_LITERAL_STRING("Courier"));
  }
  else if (aGenericFamily.EqualsIgnoreCase("-moz-fixed"))
  {
    aFontFace.Assign(NS_LITERAL_STRING("Courier"));
  }
  */
}

struct FontEnumData {
  FontEnumData(nsIDeviceContext* aDC, nsString& aFaceName, ScriptCode aScriptCode)
    : mContext(aDC), mFaceName(aFaceName), mScriptCode(aScriptCode)
  {}
  nsIDeviceContext* mContext;
  nsString&         mFaceName;
  ScriptCode		mScriptCode;
};

static PRBool FontEnumCallback(const nsString& aFamily, PRBool aGeneric, void *aData)
{
  FontEnumData* data = (FontEnumData*)aData;
  if (aGeneric)
  {
    nsAutoString realFace;
    MapGenericFamilyToFont(aFamily, realFace, data->mScriptCode);
    data->mFaceName = realFace;
    return PR_FALSE;  // stop
  }
  else
  {
    nsAutoString realFace;
    PRBool  aliased;
    data->mContext->GetLocalFontName(aFamily, realFace, aliased);
    if (aliased || (NS_OK == data->mContext->CheckFontExistence(realFace)))
    {
    	data->mFaceName = realFace;
      return PR_FALSE;  // stop
    }
  }
  return PR_TRUE;
}

void nsFontMetricsMac::RealizeFont()
{
	nsAutoString	fontName;
	nsUnicodeMappingUtil	*unicodeMappingUtil;
	ScriptCode				theScriptCode;

	unicodeMappingUtil = nsUnicodeMappingUtil::GetSingleton ();
	if (unicodeMappingUtil)
	{
		nsAutoString	theLangGroupString;

		if (mLangGroup)
			mLangGroup->ToString(theLangGroupString);
		else
			theLangGroupString.Assign(NS_LITERAL_STRING("ja"));

		theScriptCode = unicodeMappingUtil->MapLangGroupToScriptCode(
		    NS_ConvertUCS2toUTF8(theLangGroupString).get());

	}
	else
		theScriptCode = GetScriptManagerVariable (smSysScript);

	FontEnumData  fontData(mContext, fontName, theScriptCode);
	mFont->EnumerateFamilies(FontEnumCallback, &fontData);
  
	nsDeviceContextMac::GetMacFontNumber(fontName, mFontNum);
}


NS_IMETHODIMP
nsFontMetricsMac::Destroy()
{
  mContext = nsnull;
  return NS_OK;
}

//------------------------------------------------------------------------

NS_IMETHODIMP
nsFontMetricsMac :: GetXHeight(nscoord& aResult)
{
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);
  aResult = NSToCoordRound(float(mMaxAscent * 0.71f));		// 0.71 = 5 / 7
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetSuperscriptOffset(nscoord& aResult)
{
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);
  aResult = NSToCoordRound(float(mMaxAscent / 2) - dev2app);
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetSubscriptOffset(nscoord& aResult)
{
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);
  aResult = NSToCoordRound(float(mMaxAscent / 2) - dev2app);
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetStrikeout(nscoord& aOffset, nscoord& aSize)
{
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);
  aOffset = NSToCoordRound(float(mMaxAscent / 2) - dev2app);
  aSize = NSToCoordRound(dev2app);
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetUnderline(nscoord& aOffset, nscoord& aSize)
{
  float  dev2app;
  mContext->GetDevUnitsToAppUnits(dev2app);
  aOffset = -NSToCoordRound( dev2app );
  aSize   = NSToCoordRound( dev2app );
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetHeight(nscoord &aHeight)
{
  aHeight = mMaxHeight;
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetNormalLineHeight(nscoord &aHeight)
{
  aHeight = mMaxHeight; // on Windows, it's mEmHeight + mLeading (= mMaxHeight on the Mac)
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetLeading(nscoord &aLeading)
{
  aLeading = mLeading;
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetEmHeight(nscoord &aHeight)
{
  aHeight = mEmHeight;
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetEmAscent(nscoord &aAscent)
{
  aAscent = mEmAscent;
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetEmDescent(nscoord &aDescent)
{
  aDescent = mEmDescent;
  return NS_OK;
}

NS_IMETHODIMP
nsFontMetricsMac :: GetMaxHeight(nscoord &aHeight)
{
  aHeight = mMaxHeight;
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetMaxAscent(nscoord &aAscent)
{
  aAscent = mMaxAscent;
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetMaxDescent(nscoord &aDescent)
{
  aDescent = mMaxDescent;
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetMaxAdvance(nscoord &aAdvance)
{
  aAdvance = mMaxAdvance;
  return NS_OK;
}

nsresult nsFontMetricsMac :: GetSpaceWidth(nscoord &aSpaceWidth)
{
  aSpaceWidth = mSpaceWidth;
  return NS_OK;
}

NS_IMETHODIMP nsFontMetricsMac :: GetFont(const nsFont *&aFont)
{
  aFont = mFont;
  return NS_OK;
}
NS_IMETHODIMP nsFontMetricsMac::GetLangGroup(nsIAtom** aLangGroup)
{
  if (!aLangGroup) {
    return NS_ERROR_NULL_POINTER;
  }

  *aLangGroup = mLangGroup;
  NS_IF_ADDREF(*aLangGroup);

  return NS_OK;
}


NS_IMETHODIMP nsFontMetricsMac :: GetWidths(const nscoord *&aWidths)
{
  return NS_ERROR_NOT_IMPLEMENTED;	//XXX
}

NS_IMETHODIMP nsFontMetricsMac :: GetFontHandle(nsFontHandle &aHandle)
{
	// NOTE: the name in the mFont may be a comma-separated list of
	// font names, like "Verdana, Arial, sans-serif"
	// If you want to do the conversion again to a Mac font, you'll
	// have to EnumerateFamilies() to resolve it to an installed
	// font again.
	NS_PRECONDITION(mFontNum != BAD_FONT_NUM, "Font metrics have not been initialized");
	
	// We have no 'font handles' on Mac like they have on Windows
	// so let's use it for the fontNum.
	aHandle = (nsFontHandle)mFontNum;
	return NS_OK;
}