/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * 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.
 *
 * Contributor(s):
 *
 *
 * 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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 * under the terms of either the GPL or the LGPL, and not to allow others to
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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#include "nscore.h"
#include "nsHTMLValue.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "nsMemory.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsUnitConversion.h"
#include "prprf.h"
#include "nsICSSStyleRule.h"
#include "nsCSSDeclaration.h"

nsHTMLValue::nsHTMLValue()
  : mUnit(eHTMLUnit_String)
{
  mValue.mString = nsnull;
}

nsHTMLValue::nsHTMLValue(PRInt32 aValue, nsHTMLUnit aUnit)
  : mUnit(aUnit)
{
  NS_ASSERTION(GetUnitClass() == HTMLUNIT_INTEGER, "unit not an integer unit");
  if (GetUnitClass() == HTMLUNIT_INTEGER) {
    mValue.mInt = aValue;
  } else {
    mUnit = eHTMLUnit_String;
    mValue.mString = nsnull;
  }
}

nsHTMLValue::~nsHTMLValue(void)
{
  Reset();
}

void nsHTMLValue::Reset(void)
{
  if (GetUnitClass() == HTMLUNIT_STRING) {
    if (mValue.mString) {
      nsCheapStringBufferUtils::Free(mValue.mString);
    }
  }
  else if (mUnit == eHTMLUnit_CSSStyleRule) {
    NS_IF_RELEASE(mValue.mCSSStyleRule);
  }
  else if (mUnit == eHTMLUnit_AtomArray) {
    delete mValue.mAtomArray;
  }
  mUnit = eHTMLUnit_String;
  mValue.mString = nsnull;
}


void nsHTMLValue::SetIntValue(PRInt32 aValue, nsHTMLUnit aUnit)
{
  Reset();
  mUnit = aUnit;
  NS_ASSERTION(GetUnitClass() == HTMLUNIT_INTEGER, "not an int value");
  if (GetUnitClass() == HTMLUNIT_INTEGER) {
    mValue.mInt = aValue;
  } else {
    mUnit = eHTMLUnit_String;
    mValue.mString = nsnull;
  }
}

void nsHTMLValue::SetPercentValue(float aValue)
{
  Reset();
  mUnit = eHTMLUnit_Percent;
  mValue.mFloat = aValue;
}

void nsHTMLValue::SetStringValueInternal(const nsAString& aValue,
                                         nsHTMLUnit aUnit)
{
  NS_ASSERTION(GetUnitClass() == HTMLUNIT_STRING, "unit not a string unit!");
  if (GetUnitClass() == HTMLUNIT_STRING) {
    // Remember the length of the string if necessary
    if (aValue.IsEmpty()) {
      mValue.mString = nsnull;
    } else {
      nsCheapStringBufferUtils::CopyToBuffer(mValue.mString, aValue);
    }
  } else {
    mUnit = eHTMLUnit_String;
    mValue.mString = nsnull;
  }
}

void nsHTMLValue::SetStringValue(const nsAString& aValue,
                                 nsHTMLUnit aUnit)
{
  Reset();
  mUnit = aUnit;
  SetStringValueInternal(aValue, aUnit);
}

void nsHTMLValue::SetCSSStyleRuleValue(nsICSSStyleRule* aValue)
{
  Reset();
  mUnit = eHTMLUnit_CSSStyleRule;
  mValue.mCSSStyleRule = aValue;
  NS_IF_ADDREF(mValue.mCSSStyleRule);
}

void nsHTMLValue::SetAtomArrayValue(nsCOMArray<nsIAtom>* aValue)
{
  Reset();
  mUnit = eHTMLUnit_AtomArray;
  mValue.mAtomArray = aValue;
}

void nsHTMLValue::SetColorValue(nscolor aValue)
{
  Reset();
  mUnit = eHTMLUnit_Color;
  mValue.mColor = aValue;
}

//
// Parsing methods
//

PRBool
nsHTMLValue::EnumValueToString(const EnumTable* aTable,
                               nsAString& aResult) const
{
  if (GetUnit() == eHTMLUnit_Enumerated) {
    PRInt32 v = GetIntValue();
    while (aTable->tag) {
      if (aTable->value == v) {
        CopyASCIItoUCS2(nsDependentCString(aTable->tag), aResult);

        return PR_TRUE;
      }
      aTable++;
    }
  }
  aResult.Truncate();
  return PR_FALSE;
}
