/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "XalanNumberFormat.hpp"


#include <xalanc/Include/STLHelper.hpp>


#include "DOMStringHelper.hpp"
#include "XalanUnicode.hpp"


namespace XALAN_CPP_NAMESPACE {


const XalanDOMChar  XalanNumberFormat::s_defaultGroupingSeparator[] = 
{
    XalanUnicode::charComma,
    0
};


XalanNumberFormat::XalanNumberFormat(MemoryManager&     theManager) :
    m_isGroupingUsed(false),
    m_groupingSeparator(s_defaultGroupingSeparator, theManager),
    m_groupingSize(3)   // Default to US values
{
}


XalanNumberFormat::~XalanNumberFormat()
{
}


XalanDOMString&
XalanNumberFormat::format(
            double              theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLInt16            theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLUInt16           theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLInt32            theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLUInt32           theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLInt64            theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


XalanDOMString&
XalanNumberFormat::format(
            XMLUInt64           theValue,
            XalanDOMString&     theResult)
{
    NumberToDOMString(theValue, theResult);

    applyGrouping(theResult, theResult);

    return theResult;
}


/*
 * Convert a string value using the currently active values for grouping size
 * and separator; returns the converted string
 */
void
XalanNumberFormat::applyGrouping(
            const XalanDOMString&   value,
            XalanDOMString&         result)
{
    if (m_isGroupingUsed == false ||
        m_groupingSize == 0)
    {
        result = value;
    }
    else
    {
        const XalanDOMString::size_type     len = value.length();

        if (len == 0)
        {
            result = value;
        }
        else
        {
            // Add two, so we leave one byte at the beginning as empty space
            const XalanDOMString::size_type     bufsize = len + len / m_groupingSize + 2;

            XalanVector<XalanDOMChar>   theGuard(result.getMemoryManager());

            theGuard.resize(bufsize);

            XalanDOMChar* const     buffer = &*theGuard.begin();
            XalanDOMChar*   p = &theGuard.back();

            // Leave a null-terminator.
            *p-- = 0;

            for (XalanDOMString::size_type i = 0, ix = len - 1; i < len && p > buffer; i++, ix--)
            {
                const XalanDOMChar      c = value[ix];

                if (i && !(i% m_groupingSize))
                {
                    // Could be a multiple character separator??
                    for (long j = long(m_groupingSeparator.length() - 1); j >= 0 && p > buffer; j--)
                        *p-- = m_groupingSeparator[j];
                }

                *p-- = c;
            }

            result = ++p;
        }
    }
}


bool
XalanNumberFormat::isGroupingUsed() const
{
    return m_isGroupingUsed;
}


void
XalanNumberFormat::setGroupingUsed(bool bUsed)
{
    m_isGroupingUsed = bUsed;
}


void
XalanNumberFormat::setGroupingSize(unsigned long    size)
{
    assert(size > 0);

    m_groupingSize = size;
}


void
XalanNumberFormat::setGroupingSeparator(const XalanDOMString&   s)
{
    m_groupingSeparator = s;
}


}