////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2011, 2025, 2026
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License along
//    with this program; if not, write to the Free Software Foundation, Inc.,
//    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
////////////////////////////////////////////////////////////////////////////////

#include <XML/XMLParser.hpp>
#include <common/Defines.hpp>
#include <stdlib.h>
#include <stdio.h>

XMLParser::XMLParser(bool useContentNodes) :
	useContentNodes_(useContentNodes),
	root_( nullptr ),
	current_( nullptr ),
	source_("Not Specified")
{
	// Init the XML parser
	p_ = XML_ParserCreate( nullptr );
	XML_SetStartElementHandler(p_, startElementStaticHandler);
	XML_SetEndElementHandler(p_, endElementStaticHandler);
	XML_SetCharacterDataHandler(p_, characterDataStaticHandler);
	XML_SetUserData(p_, this);
}

XMLParser::~XMLParser()
{
	// Cleanup
	XML_ParserFree(p_);
	delete root_;
}

bool XMLParser::parse(const char *data, int len, int final)
{
	// Parser the XML
	XML_Status status;
	status = XML_Parse(p_, data, len, final);
	return (status == XML_STATUS_OK);
}

const char *XMLParser::getParseError()
{
	XML_Error errorCode = XML_GetErrorCode(p_);

	static char message[1024];
	snprintf(
		message,
		1024,
		"Parse Error, File %s: Line:%lu Col:%lu Error:%s",
		source_.c_str(),
		XML_GetCurrentLineNumber(p_),
		XML_GetCurrentColumnNumber(p_),
		XML_ErrorString(errorCode)
	);
	return message;
}

void XMLParser::startElementHandler(const XML_Char *name, const XML_Char **atts)
{
	if (!root_)
	{
		// Create the root node
		root_ = current_ = new XMLNode(name);
		root_->setUseContentNodes(useContentNodes_);
		root_->setSource(source_.c_str());
		root_->setLine(XML_GetCurrentLineNumber(p_), XML_GetCurrentColumnNumber(p_));
	}
	else
	{
		DIALOG_ASSERT(current_);

		// Add a new child to this node
		XMLNode *newNode = new XMLNode(name);
		current_->setUseContentNodes(useContentNodes_);
		current_->addChild(newNode);
		current_ = newNode;
		current_->setLine(XML_GetCurrentLineNumber(p_), XML_GetCurrentColumnNumber(p_));
	}

	if (atts)
	{
		while (*atts)
		{
			const XML_Char *name = *atts;
			atts++;
			const XML_Char *value = *atts;
			atts++;

			XMLNode *param = new XMLNode(name, "", XMLNode::XMLParameterType);
			param->addContent( value, (int)strlen(value) );
			param->setLine( XML_GetCurrentLineNumber(p_), XML_GetCurrentColumnNumber(p_) );
			current_->addParameter(param);
		}
	}
}

void XMLParser::endElementHandler(const XML_Char *name)
{
	DIALOG_ASSERT(current_);
	DIALOG_ASSERT(strcmp(name, current_->getName()) == 0);

	current_ = (XMLNode *) current_->getParent();
}

void XMLParser::characterDataHandler(const XML_Char *s, int len)
{
	current_->addContent(s, len);
}

void XMLParser::startElementStaticHandler(void *userData, const XML_Char *name, const XML_Char **atts)
{
	XMLParser *parser = (XMLParser *) userData;
	parser->startElementHandler(name, atts);
}

void XMLParser::endElementStaticHandler(void *userData, const XML_Char *name)
{
	XMLParser *parser = (XMLParser *) userData;
	parser->endElementHandler(name);
}

void XMLParser::characterDataStaticHandler(void *userData, const XML_Char *s, int len)
{
	XMLParser *parser = (XMLParser *) userData;
	parser->characterDataHandler(s, len);
}
