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

 Copyright (c) 2009, Charles McGarvey
 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.
 
 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 HOLDER 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 <fstream>

#include <yajl/yajl_gen.h>

#include "Serializer.hh"
#include "StringTools.hh"


namespace Mf {


struct Serializer::Impl
{
	Impl(const std::string& filePath, const std::string& indent = "")
	{
		std::ofstream* output = new std::ofstream(filePath.c_str());
		init(*output, true, indent);
	}

	Impl(std::ostream& output, const std::string& indent = "")
	{
		init(output, false, indent);
	}

	~Impl()
	{
		if (deleteWhenDone)
		{
			delete out;
		}
		yajl_gen_free(gen);
	}

	static void raise(yajl_gen_status err)
	{
		switch (err)
		{
			case yajl_gen_generation_complete:
				throw Serializer::Exception(Exception::ARCHIVE_TERMINATED);
			case yajl_gen_keys_must_be_strings:
				throw Serializer::Exception(Exception::KEYS_MUST_BE_STRINGS);
			case yajl_max_depth_exceeded:
				throw Serializer::Exception(Exception::RECURSION_TOO_DEEP);
			case yajl_gen_in_error_state:
				throw Serializer::Exception(Exception::ALREADY_FAILED);
			case yajl_gen_status_ok:
				; // There is no error here.  Move along...
		}
	}

	yajl_gen		gen;

	std::ostream*	out;
	bool			deleteWhenDone;

private:

	void init(std::ostream& output, bool deleteOut, const std::string& indent)
	{
		yajl_gen_config config;

		out = &output;
		deleteWhenDone = deleteOut;

		if (indent != "")
		{
			config.beautify = true;
			config.indentString = 0;
			// FIXME a yajl bug prevents using heap-allocated strings
			//config.indentString = indent.c_str();
		}
		else
		{
			config.beautify = false;
		}
		gen = yajl_gen_alloc(&config, 0);
	}
};


Serializer::Serializer(const std::string& filePath, const std::string& indent) :
	// pass through
	impl_(new Serializer::Impl(filePath, indent)) {}

Serializer::Serializer(std::ostream& output, const std::string& indent) :
	// pass through
	impl_(new Serializer::Impl(output, indent)) {}

Serializer::~Serializer()
{
	flush();
}


void Serializer::push(long value)
{
	yajl_gen_status stat = yajl_gen_integer(impl_->gen, value);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::push(double value)
{
	yajl_gen_status stat = yajl_gen_double(impl_->gen, value);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::push(bool value)
{
	yajl_gen_status stat = yajl_gen_bool(impl_->gen, value);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::push(const std::string& value)
{
	yajl_gen_status stat = yajl_gen_string(impl_->gen,
			(const unsigned char*)value.c_str(), value.length());
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::push(const std::wstring& value)
{
	push(wideToMulti(value));
}

void Serializer::pushNull()
{
	yajl_gen_status stat = yajl_gen_null(impl_->gen);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}


void Serializer::pushMapHead()
{
	yajl_gen_status stat = yajl_gen_map_open(impl_->gen);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::pushMapTail()
{
	yajl_gen_status stat = yajl_gen_map_close(impl_->gen);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::pushArrayHead()
{
	yajl_gen_status stat = yajl_gen_array_open(impl_->gen);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}

void Serializer::pushArrayTail()
{
	yajl_gen_status stat = yajl_gen_array_close(impl_->gen);
	if (stat != yajl_gen_status_ok) Serializer::Impl::raise(stat);
}


void Serializer::flush()
{
	const unsigned char* buffer;
	unsigned length;

	yajl_gen_get_buf(impl_->gen, &buffer, &length);
	impl_->out->write((const char*)buffer, length);
	yajl_gen_clear(impl_->gen);
}


} // namespace Mf

/** vim: set ts=4 sw=4 tw=80: *************************************************/