// Copyright (C) 2011 Milo Yip
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#ifndef RAPIDJSON_FILEWRITESTREAM_H_
#define RAPIDJSON_FILEWRITESTREAM_H_

#include "rapidjson.h"
#include <cstdio>

namespace rapidjson {

//! Wrapper of C file stream for input using fread().
/*!
    \note implements Stream concept
*/
	class FileWriteStream {
	public:
		typedef char Ch;    //!< Character type. Only support char.

		FileWriteStream(FILE *fp, char *buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferEnd_(buffer + bufferSize),
		                                                             current_(buffer_) {
			RAPIDJSON_ASSERT(fp_ != 0);
		}

		void Put(char c) {
			if (current_ >= bufferEnd_)
				Flush();

			*current_++ = c;
		}

		void PutN(char c, size_t n) {
			size_t avail = static_cast<size_t>(bufferEnd_ - current_);
			while (n > avail) {
				std::memset(current_, c, avail);
				current_ += avail;
				Flush();
				n -= avail;
				avail = static_cast<size_t>(bufferEnd_ - current_);
			}

			if (n > 0) {
				std::memset(current_, c, n);
				current_ += n;
			}
		}

		void Flush() {
			if (current_ != buffer_) {
				fwrite(buffer_, 1, static_cast<size_t>(current_ - buffer_), fp_);
				current_ = buffer_;
			}
		}

		// Not implemented
		char Peek() const {
			RAPIDJSON_ASSERT(false);
			return 0;
		}

		char Take() {
			RAPIDJSON_ASSERT(false);
			return 0;
		}

		size_t Tell() const {
			RAPIDJSON_ASSERT(false);
			return 0;
		}

		char *PutBegin() {
			RAPIDJSON_ASSERT(false);
			return 0;
		}

		size_t PutEnd(char *) {
			RAPIDJSON_ASSERT(false);
			return 0;
		}

	private:
		// Prohibit copy constructor & assignment operator.
		FileWriteStream(const FileWriteStream &);

		FileWriteStream &operator=(const FileWriteStream &);

		FILE *fp_;
		char *buffer_;
		char *bufferEnd_;
		char *current_;
	};

//! Implement specialized version of PutN() with memset() for better performance.
	template<>
	inline void PutN(FileWriteStream &stream, char c, size_t n) {
		stream.PutN(c, n);
	}

} // namespace rapidjson

#endif // RAPIDJSON_FILESTREAM_H_
