/*LICENSE_START*/
/*
 *  Copyright (C) 2014  Washington University School of Medicine
 *
 *  This program 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.
 *
 *  This program 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.
 */
/*LICENSE_END*/

#include <fstream>
#include <ostream>
#include <iostream>

#include "CommandGiftiConvert.h"
#include "FileInformation.h"
#include "GiftiFile.h"
#include "ProgramParameters.h"

using namespace caret;

/**
 * Constructor.
 */
CommandGiftiConvert::CommandGiftiConvert()
: CommandOperation("-gifti-convert",
                         "Convert a GIFTI file to a different encoding")
{
    
}

/**
 * Destructor.
 */
CommandGiftiConvert::~CommandGiftiConvert()
{
    
}

/**
 * @return The help information.
 */
AString
CommandGiftiConvert::getHelpInformation(const AString& /*programName*/)
{
    AString helpInfo = ("Convert GIFTI file to different encoding\n"
                        "\n"
                        "Usage:  <gifti-encoding>\n"
                        "        <input-gifti-file>\n"
                        "        <output-gifti-file>\n"
                        "    \n"
                        "    gifti-encoding\n"
                        "        Required GIFTI encoding.\n"
                        "    \n"
                        "    input-gifti-file\n"
                        "        Required input GIFTI file name.\n"
                        "    \n"
                        "    output-gifti-file\n"
                        "        Required output GIFTI file name.\n"
                        "    \n"
                        );
    
    helpInfo += ("    Valid GIFTI Encodings: \n"
                 "        ASCII\n"
                 "        BASE64_BINARY\n"
                 "        GZIP_BASE64_BINARY\n"
                 "        EXTERNAL_FILE_BINARY\n"
                 "\n");
    
    return helpInfo;
}

/**
 * Execute the operation.
 * 
 * @param parameters
 *   Parameters for the operation.
 * @throws CommandException
 *   If the command failed.
 * @throws ProgramParametersException
 *   If there is an error in the parameters.
 */
void 
CommandGiftiConvert::executeOperation(ProgramParameters& parameters) throw (CommandException,
                                                               ProgramParametersException)
{
    const AString encodingName = parameters.nextString("GIFTI Encoding Name");
    const AString inputFileName = parameters.nextString("Input GIFTI File Name");
    const AString outputFileName = parameters.nextString("Output GIFTI File Name");
    
    bool isValidEncoding = false;
    GiftiEncodingEnum::Enum encoding = GiftiEncodingEnum::fromName(encodingName, &isValidEncoding);
    if (isValidEncoding == false) {
        throw CommandException("GIFTI Encoding is invalid.");
    }
    if (inputFileName.isEmpty()) {
        throw CommandException("Input GIFTI file name is empty.");
    }
    if (outputFileName.isEmpty()) {
        throw CommandException("Input GIFTI file name is empty.");
    }

    try {
        GiftiFile gf;
        gf.readFile(inputFileName);
        gf.setEncodingForWriting(encoding);
        gf.writeFile(outputFileName);
    }
    catch (const GiftiException& e) {
        throw CommandException(e);
    } catch (CaretException& e) {
        throw CommandException(e);//rethrow all other caret exceptions as CommandException
    } catch (std::exception& e) {
        throw CommandException(e.what());//rethrow std::exception and derived as CommandException
    } catch (...) {
        throw CommandException("unknown exception type thrown");//throw dummy CommandException for anything else
    }
}
