/*
   Copyright (C) 2005-2012, by the President and Fellows of Harvard College.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

         http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

   Dataverse Network - A web application to share, preserve and analyze research data.
   Developed at the Institute for Quantitative Social Science, Harvard University.
   Version 3.0.
*/
package edu.harvard.iq.dvn.ingest.dsb.impl;

import java.io.*;
import java.util.logging.*;
import static java.lang.System.*;
import edu.harvard.iq.dvn.ingest.dsb.*;
/**
 */
public class RcutDatasetCutter implements DatasetCutter{

    private static String[] PROGRAM = new String[3];
    private static String RCUT;
    static {
        PROGRAM[0] = "/bin/sh";
        PROGRAM[1] = "-c";

        String rcut_dir = System.getProperty("dvn.dsb.rcut.home");
        if (rcut_dir == null) {
            // temporary test measure later an FileNotFoundException will be
            // thrown
            RCUT = "/usr/local/VDC/bin/rcut";
        } else {
            RCUT = rcut_dir + File.separator + "rcut";
        }
    }

    private static Logger dbgLog = Logger.getLogger(RcutDatasetCutter.class.getPackage().getName());


    /** Set to true to end the loop */
    static boolean done = false;

    public RcutDatasetCutter() {
    }

    String subsetcriteria;
    String infilename;
    String outfilename;

    public RcutDatasetCutter(String subsetcriteria, String infilename) {
        this.subsetcriteria = subsetcriteria;
        this.infilename = infilename;
    }

    public RcutDatasetCutter(String subsetcriteria, String infilename,
        String outfilename) {
        this.subsetcriteria = subsetcriteria;
        this.infilename = infilename;
        this.outfilename = outfilename;
    }

    public void run() {

        final Process p;
        BufferedReader is; // reader for output of process
        String line;

        /*
         * -c must (if !-f) -d optional (default=tab) -s optional -f must (if
         * !-c) -o optional (default=tab) -r optional (default=1) -n optional
         * (default=na) -m optional (default=?) -g optional (default=all)
         */

        // java -cp .: DatasetCutter 1:710-713,1:714-717 inputfilename
        String cmnd = RCUT + " " + subsetcriteria + " < " + infilename;
        if (outfilename != null) {
            PROGRAM[2] = cmnd + " > " + outfilename;
        } else {
            PROGRAM[2] = cmnd;
        }
        dbgLog.fine("command fragment=" + PROGRAM[2]);

        try {
            p = Runtime.getRuntime().exec(PROGRAM);

            Thread waiter = new Thread() {
                @Override
                public void run() {
                    try {
                        p.waitFor();
                    } catch (InterruptedException ex) {
                        // OK, just quit.
                        return;
                    }
                    dbgLog.fine("rcut has been terminated!");
                    done = true;
                }
            };
            waiter.start();

            is = new BufferedReader(new InputStreamReader(p.getInputStream()));

            while (!done && ((line = is.readLine()) != null)) {
                dbgLog.fine(line);
            }
            // Debug.println("exec", "In Main after EOF");
            return;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}