/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#include <sal/config.h>

#include <cassert>
#include <climits>
#include <set>

#include <com/sun/star/uno/RuntimeException.hpp>
#include <rtl/ustring.hxx>
#include <xmlreader/span.hxx>
#include <xmlreader/xmlreader.hxx>

#include "parsemanager.hxx"
#include "xcdparser.hxx"
#include "xcsparser.hxx"
#include "xcuparser.hxx"
#include "xmldata.hxx"

namespace configmgr {

XcdParser::XcdParser(
    int layer, std::set< OUString > const & processedDependencies, Data & data):
    layer_(layer), processedDependencies_(processedDependencies), data_(data),
    state_(STATE_START), dependencyOptional_(), nesting_()
{}

XcdParser::~XcdParser() {}

xmlreader::XmlReader::Text XcdParser::getTextMode() {
    return nestedParser_.is()
        ? nestedParser_->getTextMode() : xmlreader::XmlReader::Text::NONE;
}

bool XcdParser::startElement(
    xmlreader::XmlReader & reader, int nsId, xmlreader::Span const & name,
    std::set< OUString > const * existingDependencies)
{
    if (nestedParser_.is()) {
        assert(nesting_ != LONG_MAX);
        ++nesting_;
        return nestedParser_->startElement(
            reader, nsId, name, existingDependencies);
    }
    switch (state_) {
    case STATE_START:
        if (nsId == ParseManager::NAMESPACE_OOR && name == "data") {
            state_ = STATE_DEPENDENCIES;
            return true;
        }
        break;
    case STATE_DEPENDENCIES:
        if (nsId == xmlreader::XmlReader::NAMESPACE_NONE &&
            name == "dependency")
        {
            if (dependencyFile_.isEmpty()) {
                dependencyOptional_ = false;
                xmlreader::Span attrFile;
                for (;;) {
                    int attrNsId;
                    xmlreader::Span attrLn;
                    if (!reader.nextAttribute(&attrNsId, &attrLn)) {
                        break;
                    }
                    if (attrNsId == xmlreader::XmlReader::NAMESPACE_NONE &&
                            //TODO: _OOR
                        attrLn == "file")
                    {
                        attrFile = reader.getAttributeValue(false);
                    } else if ((attrNsId ==
                                xmlreader::XmlReader::NAMESPACE_NONE) &&
                               attrLn == "optional")
                    {
                        dependencyOptional_ = xmldata::parseBoolean(
                            reader.getAttributeValue(true));
                    }
                }
                if (!attrFile.is()) {
                    throw css::uno::RuntimeException(
                        "no dependency file attribute in " + reader.getUrl());
                }
                dependencyFile_ = attrFile.convertFromUtf8();
                if (dependencyFile_.isEmpty()) {
                    throw css::uno::RuntimeException(
                        "bad dependency file attribute in " + reader.getUrl());
                }
            }
            if ((processedDependencies_.find(dependencyFile_) ==
                 processedDependencies_.end()) &&
                (!dependencyOptional_ || existingDependencies == nullptr ||
                 (existingDependencies->find(dependencyFile_) !=
                  existingDependencies->end())))
            {
                return false;
            }
            state_ = STATE_DEPENDENCY;
            dependencyFile_.clear();
            return true;
        }
        state_ = STATE_COMPONENTS;
        [[fallthrough]];
    case STATE_COMPONENTS:
        if (nsId == ParseManager::NAMESPACE_OOR &&
            name == "component-schema")
        {
            nestedParser_ = new XcsParser(layer_, data_);
            nesting_ = 1;
            return nestedParser_->startElement(
                reader, nsId, name, existingDependencies);
        }
        if (nsId == ParseManager::NAMESPACE_OOR &&
            (name == "component-data" || name == "items"))
        {
            nestedParser_ = new XcuParser(layer_ + 1, data_, nullptr, nullptr, nullptr);
            nesting_ = 1;
            return nestedParser_->startElement(
                reader, nsId, name, existingDependencies);
        }
        break;
    default: // STATE_DEPENDENCY
        assert(false); // this cannot happen
        break;
    }
    throw css::uno::RuntimeException(
        "bad member <" + name.convertFromUtf8() + "> in " + reader.getUrl());
}

void XcdParser::endElement(xmlreader::XmlReader const & reader) {
    if (nestedParser_.is()) {
        nestedParser_->endElement(reader);
        if (--nesting_ == 0) {
            nestedParser_.clear();
        }
    } else {
        switch (state_) {
        case STATE_DEPENDENCY:
            state_ = STATE_DEPENDENCIES;
            break;
        case STATE_DEPENDENCIES:
        case STATE_COMPONENTS:
            break;
        default:
            assert(false); // this cannot happen
            break;
        }
    }
}

void XcdParser::characters(xmlreader::Span const & text) {
    if (nestedParser_.is()) {
        nestedParser_->characters(text);
    }
}

}

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