/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2002-2023 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
/// @file    GenericHandler.cpp
/// @author  Pablo Alvarez Lopez
/// @date    Dec 2022
///
// A handler which converts occuring elements and attributes into strings
/****************************************************************************/
#include <config.h>

#include <cassert>
#include <utils/common/StringUtils.h>
#include <utils/common/StringUtils.h>
#include <utils/common/FileHelpers.h>
#include <utils/common/MsgHandler.h>
#include <utils/common/ToString.h>

#include "GenericHandler.h"
#include "SUMOSAXAttributesImpl_Xerces.h"
#include "XMLSubSys.h"


// ===========================================================================
// class definitions
// ===========================================================================

GenericHandler::GenericHandler(const std::string& file, const std::string& expectedRoot) :
    myParentHandler(nullptr),
    myParentIndicator(SUMO_TAG_NOTHING),
    myFileName(file),
    myExpectedRoot(expectedRoot), myNextSectionStart(-1, nullptr) {
}


GenericHandler::~GenericHandler() {
    delete myNextSectionStart.second;
}


void
GenericHandler::setFileName(const std::string& name) {
    myFileName = name;
}


const std::string&
GenericHandler::getFileName() const {
    return myFileName;
}


XMLCh*
GenericHandler::convert(const std::string& name) const {
    int len = (int)name.length();
    XMLCh* ret = new XMLCh[len + 1];
    int i = 0;
    for (; i < len; i++) {
        ret[i] = (XMLCh) name[i];
    }
    ret[i] = 0;
    return ret;
}


void
GenericHandler::startElement(const XMLCh* const /*uri*/,
                             const XMLCh* const /*localname*/,
                             const XMLCh* const qname,
                             const XERCES_CPP_NAMESPACE::Attributes& attrs) {
    std::string name = StringUtils::transcode(qname);
    if (!myRootSeen && myExpectedRoot != "" && name != myExpectedRoot) {
        WRITE_WARNINGF(TL("Found root element '%' in file '%' (expected '%')."), name, getFileName(), myExpectedRoot);
    }
    myRootSeen = true;
    myCharactersVector.clear();
    const int element = convertTag(name);
    if (mySectionSeen && !mySectionOpen && element != mySection) {
        mySectionEnded = true;
        myNextSectionStart.first = element;
        myNextSectionStart.second = new SUMOSAXAttributesImpl_Xerces(attrs, {}, {}, name);
        return;
    }
    if (element == mySection) {
        mySectionSeen = true;
        mySectionOpen = true;
    }
    SUMOSAXAttributesImpl_Xerces na(attrs, {}, {}, name);
    if (element == SUMO_TAG_INCLUDE) {
        std::string file = na.getString(SUMO_ATTR_HREF);
        if (!FileHelpers::isAbsolute(file)) {
            file = FileHelpers::getConfigurationRelative(getFileName(), file);
        }
        //XMLSubSys::runParser(*this, file);
    } else {
        myStartElement(element, na);
    }
}


void
GenericHandler::endElement(const XMLCh* const /*uri*/,
                           const XMLCh* const /*localname*/,
                           const XMLCh* const qname) {
    std::string name = StringUtils::transcode(qname);
    int element = convertTag(name);
    // collect characters
    if (myCharactersVector.size() != 0) {
        int len = 0;
        for (int i = 0; i < (int)myCharactersVector.size(); ++i) {
            len += (int)myCharactersVector[i].length();
        }
        char* buf = new char[len + 1];
        int pos = 0;
        for (int i = 0; i < (int)myCharactersVector.size(); ++i) {
            memcpy((unsigned char*) buf + pos, (unsigned char*) myCharactersVector[i].c_str(),
                   sizeof(char)*myCharactersVector[i].length());
            pos += (int)myCharactersVector[i].length();
        }
        buf[pos] = 0;

        // call user handler
        try {
            myCharacters(element, buf);
        } catch (std::runtime_error&) {
            delete[] buf;
            throw;
        }
        delete[] buf;
    }
    if (element == mySection) {
        mySectionOpen = false;
    }
    if (element != SUMO_TAG_INCLUDE) {
        myEndElement(element);
        if (myParentHandler && myParentIndicator == element) {
            //XMLSubSys::setHandler(*myParentHandler);
            myParentIndicator = SUMO_TAG_NOTHING;
            myParentHandler = nullptr;
        }
    }
}


void
GenericHandler::registerParent(const int tag, GenericHandler* handler) {
    myParentHandler = handler;
    myParentIndicator = tag;
    //XMLSubSys::setHandler(*this);
}


void
GenericHandler::characters(const XMLCh* const chars, const XERCES3_SIZE_t length) {
    if (myCollectCharacterData) {
        myCharactersVector.push_back(StringUtils::transcode(chars, (int)length));
    }
}


int
GenericHandler::convertTag(const std::string& tag) const {
    TagMap::const_iterator i = myTagMap.find(tag);
    if (i == myTagMap.end()) {
        return SUMO_TAG_NOTHING;
    }
    return (*i).second;
}


std::string
GenericHandler::buildErrorMessage(const XERCES_CPP_NAMESPACE::SAXParseException& exception) {
    std::ostringstream buf;
    char* pMsg = XERCES_CPP_NAMESPACE::XMLString::transcode(exception.getMessage());
    buf << pMsg << std::endl;
    buf << " In file '" << getFileName() << "'" << std::endl;
    buf << " At line/column " << exception.getLineNumber() + 1
        << '/' << exception.getColumnNumber() << "." << std::endl;
    XERCES_CPP_NAMESPACE::XMLString::release(&pMsg);
    return buf.str();
}


void
GenericHandler::warning(const XERCES_CPP_NAMESPACE::SAXParseException& exception) {
    WRITE_WARNING(buildErrorMessage(exception));
}


void
GenericHandler::error(const XERCES_CPP_NAMESPACE::SAXParseException& exception) {
    throw ProcessError(buildErrorMessage(exception));
}


void
GenericHandler::fatalError(const XERCES_CPP_NAMESPACE::SAXParseException& exception) {
    throw ProcessError(buildErrorMessage(exception));
}


void
GenericHandler::myStartElement(int, const SUMOSAXAttributes&) {}


void
GenericHandler::myCharacters(int, const std::string&) {}


void
GenericHandler::myEndElement(int) {}

void
GenericHandler::callParentEnd(int element) {
    if (myParentHandler) {
        myParentHandler->myEndElement(element);
    }
}

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