#include "../Common.h"
#ifdef MCDS_FLASH_VERSION
    #pragma GCC system_header
#endif

#ifndef RAPIDJSON_WRITER_H_
#define RAPIDJSON_WRITER_H_

#include "rapidjson.h"
#include "internal/stack.h"
#include "internal/strfunc.h"
#include <cstdio> // snprintf() or _sprintf_s()
#include <new>  // placement new

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4127) // conditional expression is constant
#endif

namespace rapidjson {

//! JSON writer
/*! Writer implements the concept Handler.
 It generates JSON text by events to an output stream.

 User may programmatically calls the functions of a writer to generate JSON text.

 On the other side, a writer can also be passed to objects that generates events, 

 for example Reader::Parse() and Document::Accept().

 \tparam Stream Type of ouptut stream.
 \tparam Encoding Encoding of both source strings and output.
 \implements Handler
*/
template<typename Stream, typename Encoding = UTF8<>, typename Allocator = MemoryPoolAllocator<> >
class Writer {
public:
 typedef typename Encoding::Ch Ch;

 Writer(Stream& stream, Allocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) : 
  stream_(stream), level_stack_(allocator, levelDepth * sizeof(Level)) {}

 //@name Implementation of Handler
 //@{
 Writer& Null()     { Prefix(kNullType);   WriteNull();   return *this; }
 Writer& Bool(bool b)   { Prefix(b ? kTrueType : kFalseType); WriteBool(b); return *this; }
 Writer& Int(int i)    { Prefix(kNumberType); WriteInt(i);   return *this; }
 Writer& Uint(unsigned u)  { Prefix(kNumberType); WriteUint(u);  return *this; }
 Writer& Int64(int64_t i64)  { Prefix(kNumberType); WriteInt64(i64);  return *this; }
 Writer& Uint64(uint64_t u64) { Prefix(kNumberType); WriteUint64(u64); return *this; }
 Writer& Double(double d)  { Prefix(kNumberType); WriteDouble(d);  return *this; }

 Writer& String(const Ch* str, SizeType length, bool copy = false) {
  (void)copy;
  Prefix(kStringType);
  WriteString(str, length);
  return *this;
 }

 Writer& StartObject() {
  Prefix(kObjectType);
  new (level_stack_.template Push<Level>()) Level(false);
  WriteStartObject();
  return *this;
 }

 Writer& EndObject(SizeType memberCount = 0) {
  (void)memberCount;
  RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
  RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray);
  level_stack_.template Pop<Level>(1);
  WriteEndObject();
  return *this;
 }

 Writer& StartArray() {
  Prefix(kArrayType);
  new (level_stack_.template Push<Level>()) Level(true);
  WriteStartArray();
  return *this;
 }

 Writer& EndArray(SizeType elementCount = 0) {
  (void)elementCount;
  RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
  RAPIDJSON_ASSERT(level_stack_.template Top<Level>()->inArray);
  level_stack_.template Pop<Level>(1);
  WriteEndArray();
  return *this;
 }
 //@}

 //! Simpler but slower overload.
 Writer& String(const Ch* str) { return String(str, internal::StrLen(str)); }

protected:
 //! Information for each nested level
 struct Level {
  Level(bool inArray_) : inArray(inArray_), valueCount(0) {}
  bool inArray;  //!< true if in array, otherwise in object
  size_t valueCount; //!< number of values in this level
 };

 static const size_t kDefaultLevelDepth = 32;

 void WriteNull()  {
  stream_.Put('n'); stream_.Put('u'); stream_.Put('l'); stream_.Put('l');
 }

 void WriteBool(bool b)  {
  if (b) {
   stream_.Put('t'); stream_.Put('r'); stream_.Put('u'); stream_.Put('e');
  }
  else {
   stream_.Put('f'); stream_.Put('a'); stream_.Put('l'); stream_.Put('s'); stream_.Put('e');
  }
 }

 void WriteInt(int i) {
  if (i < 0) {
   stream_.Put('-');
   i = -i;
  }
  WriteUint((unsigned)i);
 }

 void WriteUint(unsigned u) {
  char buffer[10];
  char *p = buffer;
  do {
   *p++ = (u % 10) + '0';
   u /= 10;
  } while (u > 0);

  do {
   --p;
   stream_.Put(*p);
  } while (p != buffer);
 }

 void WriteInt64(int64_t i64) {
  if (i64 < 0) {
   stream_.Put('-');
   i64 = -i64;
  }
  WriteUint64((uint64_t)i64);
 }

 void WriteUint64(uint64_t u64) {
  char buffer[20];
  char *p = buffer;
  do {
   *p++ = char(u64 % 10) + '0';
   u64 /= 10;
  } while (u64 > 0);

  do {
   --p;
   stream_.Put(*p);
  } while (p != buffer);
 }

 //! \todo Optimization with custom double-to-string converter.
 void WriteDouble(double d) {
  char buffer[100];
#if _MSC_VER
  int ret = sprintf_s(buffer, sizeof(buffer), "%g", d);
#else
  int ret = snprintf(buffer, sizeof(buffer), "%g", d);
#endif
  RAPIDJSON_ASSERT(ret >= 1);
  for (int i = 0; i < ret; i++)
   stream_.Put(buffer[i]);
 }

 void WriteString(const Ch* str, SizeType length)  {
  static const char hexDigits[] = "0123456789ABCDEF";
  static const char escape[256] = {
#define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
   //0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
   'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'b', 't', 'n', 'u', 'f', 'r', 'u', 'u', // 00
   'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', 'u', // 10
     0,   0, '"',   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0, // 20
   Z16, Z16,                  // 30~4F
     0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,'\\',   0,   0,   0, // 50
   Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16, Z16        // 60~FF
#undef Z16
  };

  stream_.Put('\"');
  for (const Ch* p = str; p != str + length; ++p) {
   if ((sizeof(Ch) == 1 || *p < 256) && escape[(unsigned char)*p])  {
    stream_.Put('\\');
    stream_.Put(escape[(unsigned char)*p]);
    if (escape[(unsigned char)*p] == 'u') {
     stream_.Put('0');
     stream_.Put('0');
     stream_.Put(hexDigits[(*p) >> 4]);
     stream_.Put(hexDigits[(*p) & 0xF]);
    }
   }
   else
    stream_.Put(*p);
  }
  stream_.Put('\"');
 }

 void WriteStartObject() { stream_.Put('{'); }
 void WriteEndObject() { stream_.Put('}'); }
 void WriteStartArray() { stream_.Put('['); }
 void WriteEndArray() { stream_.Put(']'); }

 void Prefix(Type type) {
  (void)type;
  if (level_stack_.GetSize() != 0) { // this value is not at root
   Level* level = level_stack_.template Top<Level>();
   if (level->valueCount > 0) {
    if (level->inArray) 
     stream_.Put(','); // add comma if it is not the first element in array
    else  // in object
     stream_.Put((level->valueCount % 2 == 0) ? ',' : ':');
   }
   if (!level->inArray && level->valueCount % 2 == 0)
    RAPIDJSON_ASSERT(type == kStringType);  // if it's in object, then even number should be a name
   level->valueCount++;
  }
  else
   RAPIDJSON_ASSERT(type == kObjectType || type == kArrayType);
 }

 Stream& stream_;
 internal::Stack<Allocator> level_stack_;

private:
 // Prohibit assignment for VC C4512 warning
 Writer& operator=(const Writer& w);
};

} // namespace rapidjson

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif // RAPIDJSON_RAPIDJSON_H_
