/***********************************************************************************
 *                                                                                 *
 * Voreen - The Volume Rendering Engine                                            *
 *                                                                                 *
 * Copyright (C) 2005-2012 University of Muenster, Germany.                        *
 * Visualization and Computer Graphics Group <http://viscg.uni-muenster.de>        *
 * For a list of authors please refer to the file "CREDITS.txt".                   *
 *                                                                                 *
 * This file is part of the Voreen software package. Voreen is free software:      *
 * you can redistribute it and/or modify it under the terms of the GNU General     *
 * Public License version 2 as published by the Free Software Foundation.          *
 *                                                                                 *
 * Voreen 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 in the file   *
 * "LICENSE.txt" along with this file. If not, see <http://www.gnu.org/licenses/>. *
 *                                                                                 *
 * For non-commercial academic use see the license exception specified in the file *
 * "LICENSE-academic.txt". To get information about commercial licensing please    *
 * contact the authors.                                                            *
 *                                                                                 *
 ***********************************************************************************/

#include "voreen/core/ports/geometryport.h"

#include "tgt/filesystem.h"
#include "voreen/core/utils/hashing.h"
#include <sstream>

namespace voreen {

GeometryPort::GeometryPort(PortDirection direction, const std::string& name,
      bool allowMultipleConnections, Processor::InvalidationLevel invalidationLevel)
    : GenericPort<Geometry>(direction, name, allowMultipleConnections, invalidationLevel)
{}

bool GeometryPort::supportsCaching() const {
    return true;
}

std::string GeometryPort::getHash() const {
    if (!hasData())
        return "";

    std::string hashes;
    std::vector<const Geometry*> geometries = getAllData();
    if (geometries.size() == 1)
        return geometries.front()->getHash();
    else {
        for (size_t i=0; i<geometries.size(); i++)
            hashes += geometries.at(i)->getHash();
        return VoreenHash::getHash(hashes);
    }

}

void GeometryPort::saveData(const std::string& path) const throw (VoreenException) {
    if (!hasData())
        throw VoreenException("Port is empty");
    tgtAssert(!path.empty(), "empty path");

    // append .xml if no extension specified
    std::string filename = path;
    if (tgt::FileSystem::fileExtension(filename).empty())
        filename += ".xml";

    // serialize workspace
    XmlSerializer s(filename);
    s.setUseAttributes(true);

    s.serialize("Geometry", getData());

    // write serialization data to temporary string stream
    std::ostringstream textStream;
    try {
        s.write(textStream);
        if (textStream.fail())
            throw SerializationException("Failed to write serialization data to string stream.");
    }
    catch (std::exception& e) {
        throw SerializationException("Failed to write serialization data to string stream: " + std::string(e.what()));
    }
    catch (...) {
        throw SerializationException("Failed to write serialization data to string stream (unknown exception).");
    }

    // Now we have a valid StringStream containing the serialization data.
    // => Open output file and write it to the file.
    std::fstream fileStream(filename.c_str(), std::ios_base::out);
    if (fileStream.fail())
        throw SerializationException("Failed to open file '" + filename + "' for writing.");

    try {
        fileStream << textStream.str();
    }
    catch (std::exception& e) {
        throw SerializationException("Failed to write serialization data stream to file '"
            + filename + "': " + std::string(e.what()));
    }
    catch (...) {
        throw SerializationException("Failed to write serialization data stream to file '"
            + filename + "' (unknown exception).");
    }
    fileStream.close();
}

void GeometryPort::loadData(const std::string& path) throw (VoreenException) {
    tgtAssert(!path.empty(), "empty path");

    // append .xml if no extension specified
    std::string filename = path;
    if (tgt::FileSystem::fileExtension(filename).empty())
        filename += ".xml";

    // open file for reading
    std::fstream fileStream(filename.c_str(), std::ios_base::in);
    if (fileStream.fail()) {
        throw SerializationException("Failed to open file '" + tgt::FileSystem::absolutePath(filename) + "' for reading.");
    }

    // read data stream into deserializer
    XmlDeserializer d(filename);
    d.setUseAttributes(true);
    try {
        d.read(fileStream);
    }
    catch (SerializationException& e) {
        throw SerializationException("Failed to read serialization data stream from file '"
            + filename + "': " + e.what());
    }
    catch (...) {
        throw SerializationException("Failed to read serialization data stream from file '"
            + filename + "' (unknown exception).");
    }

    // deserialize workspace from data stream
    try {
        Geometry* geometry = 0;
        d.deserialize("Geometry", geometry);
        setData(geometry);
    }
    catch (std::exception& e) {
        throw SerializationException("Deserialization from file '" + filename + "' failed: " + e.what());
    }
    catch (...) {
        throw SerializationException("Deserialization from file '" + filename + "' failed (unknown exception).");
    }
}

tgt::col3 GeometryPort::getColorHint() const {
    return tgt::col3(255, 255, 0);
}

} // namespace
