/**
 * SPDX-FileCopyrightText: 2023 Sebastien Jodogne, UCLouvain, Belgium
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

/**
 * Java plugin for Orthanc
 * Copyright (C) 2023 Sebastien Jodogne, UCLouvain, Belgium
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 **/


import be.uclouvain.orthanc.Callbacks;
import be.uclouvain.orthanc.RestOutput;
import be.uclouvain.orthanc.HttpMethod;

import org.dcm4che3.data.Attributes;
import org.dcm4che3.io.DicomInputStream;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Map;

public class Main {
    static {
        Callbacks.register("/dcm4che-parse", new Callbacks.OnRestRequest() {
            @Override
            public void call(RestOutput output,
                             HttpMethod method,
                             String uri,
                             String[] regularExpressionGroups,
                             Map<String, String> headers,
                             Map<String, String> getParameters,
                             byte[] body) {
                if (method != HttpMethod.POST) {
                    output.sendMethodNotAllowed("POST");  // Answer with HTTP status 405
                } else {
                    ByteArrayInputStream stream = new ByteArrayInputStream(body);

                    try (DicomInputStream din = new DicomInputStream(stream)) {
                        Attributes dataset = din.readDataset();
                        output.answerBuffer(dataset.toString().getBytes(), "text/plain");
                    } catch (IOException e) {
                        output.sendHttpStatus((short) 400, "Cannot parse DICOM file\n".getBytes());
                    }
                }
            }
        });
    }
}