/******************************************************************************

Copyright (c) 2009-2010, Terry Caton
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright 
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the projecct nor the names of its contributors 
      may be used to endorse or promote products derived from this software 
      without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

******************************************************************************/

#include "writer.h"
#include <iostream>
#include <iomanip>

/*  

TODO:
* better documentation
* unicode character encoding

*/

namespace json
{

#ifdef JSON_USE_FORMATTING
#define JSON_TAB(x) std::string(x, '\t')
#define JSON_ENDL std::endl
#else
#define JSON_TAB(x) ""
#define JSON_ENDL ""
#endif

inline void Writer::Write(const UnknownElement& elementRoot, std::ostream& ostr) { Write_i(elementRoot, ostr); }
inline void Writer::Write(const Object& object, std::ostream& ostr)              { Write_i(object, ostr); }
inline void Writer::Write(const Array& array, std::ostream& ostr)                { Write_i(array, ostr); }
inline void Writer::Write(const Number& number, std::ostream& ostr)              { Write_i(number, ostr); }
inline void Writer::Write(const String& string, std::ostream& ostr)              { Write_i(string, ostr); }
inline void Writer::Write(const Boolean& boolean, std::ostream& ostr)            { Write_i(boolean, ostr); }
inline void Writer::Write(const Null& null, std::ostream& ostr)                  { Write_i(null, ostr); }

inline bool isControlCharacter(char ch)
{
   return ch > 0 && ch <= 0x1F;
}

inline Writer::Writer(std::ostream& ostr) :
   m_ostr(ostr),
   m_nTabDepth(0)
{}

template <typename ElementTypeT>
void Writer::Write_i(const ElementTypeT& element, std::ostream& ostr)
{
   Writer writer(ostr);
   writer.Write_i(element);
   ostr.flush(); // all done
}

inline void Writer::Write_i(const Array& array)
{
   if (array.Empty())
      m_ostr << "[]";
   else
   {
      m_ostr << '[' << JSON_ENDL;
      ++m_nTabDepth;

      Array::const_iterator it(array.Begin()),
                            itEnd(array.End());
      while (it != itEnd) {
          m_ostr << JSON_TAB(m_nTabDepth);
         
         Write_i(*it);

         if (++it != itEnd)
            m_ostr << ',';
         m_ostr << JSON_ENDL;
      }

      --m_nTabDepth;
      m_ostr << JSON_TAB(m_nTabDepth) << ']';
   }
}

inline void Writer::Write_i(const Object& object)
{
   if (object.Empty())
      m_ostr << "{}";
   else
   {
      m_ostr << '{' << JSON_ENDL;
      ++m_nTabDepth;

      Object::const_iterator it(object.Begin()),
                             itEnd(object.End());
      while (it != itEnd) {
         m_ostr << JSON_TAB(m_nTabDepth);
         
         Write_i(it->name);

         m_ostr << " : ";
         Write_i(it->element); 

         if (++it != itEnd)
            m_ostr << ',';
         m_ostr << JSON_ENDL;
      }

      --m_nTabDepth;
      m_ostr << JSON_TAB(m_nTabDepth) << '}';
   }
}

inline void Writer::Write_i(const Number& numberElement)
{
   m_ostr << std::setprecision(20) << numberElement.Value();
}

inline void Writer::Write_i(const Boolean& booleanElement)
{
   m_ostr << (booleanElement.Value() ? "true" : "false");
}

inline void Writer::Write_i(const String& stringElement)
{
   m_ostr << '"';

   const std::string& s = stringElement.Value();
   std::string::const_iterator it(s.begin()),
                               itEnd(s.end());
   for (; it != itEnd; ++it)
   {
      switch (*it)
      {
         case '"':         m_ostr << "\\\"";   break;
         case '\\':        m_ostr << "\\\\";   break;
         case '\b':        m_ostr << "\\b";    break;
         case '\f':        m_ostr << "\\f";    break;
         case '\n':        m_ostr << "\\n";    break;
         case '\r':        m_ostr << "\\r";    break;
         case '\t':        m_ostr << "\\t";    break;
//         case '\u':        m_ostr << "\\u";    break; // uh...
         default:
            if ( isControlCharacter( *it ) )
            {
               std::ostringstream oss;
               oss << "\\u" << std::hex << std::uppercase << std::setfill('0') << std::setw(4) << static_cast<int>(*c);
               result += oss.str();
            }
            else
            {
				m_ostr << *it;
			}
            break;

      }
   }

   m_ostr << '"';   
}

inline void Writer::Write_i(const Null& )
{
   m_ostr << "null";
}

inline void Writer::Write_i(const UnknownElement& unknown)
{
   unknown.Accept(*this); 
}

inline void Writer::Visit(const Array& array)       { Write_i(array); }
inline void Writer::Visit(const Object& object)     { Write_i(object); }
inline void Writer::Visit(const Number& number)     { Write_i(number); }
inline void Writer::Visit(const String& string)     { Write_i(string); }
inline void Writer::Visit(const Boolean& boolean)   { Write_i(boolean); }
inline void Writer::Visit(const Null& null)         { Write_i(null); }



} // End namespace