// Standard C++
#include <memory>
#include <sstream>

// Projekt
#include "xml.hpp"

// Expat XML Parser
#define XML_STATIC		// force static linkage
#include "expat.h"

using namespace std;

void
XML::parse(istream& in)
{
	unique_ptr<XML_ParserStruct, decltype(&XML_ParserFree)> parser(XML_ParserCreate(nullptr), XML_ParserFree);

	// setup expat
	XML_SetUserData(parser.get(), this);
	XML_SetElementHandler(parser.get(), tag_start, tag_end);
	XML_SetCdataSectionHandler(parser.get(), cdata_start, cdata_end);
	XML_SetCharacterDataHandler(parser.get(), data);

	char buffer[2048];
	for ( bool done = false; !done ; ) {
		in.read(buffer, sizeof buffer);
		done = (in.gcount() < sizeof buffer);

		if ( XML_Parse(parser.get(), buffer, static_cast<int>(in.gcount()), done) != XML_STATUS_OK ) {
			stringstream msg;

			msg << XML_ErrorString(XML_GetErrorCode(parser.get()));
			msg << " in line " << XML_GetCurrentLineNumber(parser.get());

			throw runtime_error( msg.str() );
		}
	}
}

void
XML::tag_start(void* me, const char* name, const char* attr[])
{
	vector<pair<string, string>> attr_temp;

	for ( size_t i = 0; attr[i]; i += 2 )
		attr_temp.push_back( make_pair<string, string>(attr[i], attr[i+1]) );

	reinterpret_cast<XML*>(me)->handle_start(name, attr_temp);
}

void
XML::tag_end(void* me, const char* name)
{
	reinterpret_cast<XML*>(me)->handle_end(name);
}

void
XML::cdata_start(void* me)
{
	reinterpret_cast<XML*>(me)->handle_cdata_start();
}

void
XML::cdata_end(void* me)
{
	reinterpret_cast<XML*>(me)->handle_cdata_end();
}

void
XML::data(void* me, const char* dat, int len)
{
	reinterpret_cast<XML*>(me)->handle_data(vector<char>(dat, dat+len));
}