// File: example7.java       I. Henry    February 18 2005
//
// Java translation of example7.c from the WFDB Programmer's Guide
//
// Copyright (C) 2005 Isaac C. Henry (ihenry@physionet.org)

import java.io.*;
import wfdb.*;

public class example7 {
	
    public static void main(String argv[]) {
	double c[], one = 1.0, vv;
	int i, j, nc = argv.length - 4, nsig, nsamp, t;
		
	if (argv.length < 3) {
	    System.out.println(
		 "usage: example7 record start duration [ coefficients ... ]");
	    // Unlike C programs, Java programs do not have any foolproof way
	    // to discover their own names, so the name is given as a constant
	    // above.  The usage statement is correct if this file has been
	    // compiled.  The command needed to run this program within a JVM
	    // is platform-dependent and likely to be more complex.
	    System.exit(1);
	}
	if (nc < 1) {
	    nc = 1;
	    c = new double[1];
	    c[0] = 1.0;
	}
	else {
	    c = new double[nc];
	}
	for (i = 0; i < nc; i++)
	    c[i] = Double.parseDouble(argv[i+3]);
	if ((nsig = wfdb.isigopen(argv[0], null, 0)) < 1)
	    System.exit(3);
	WFDB_SiginfoArray s = new WFDB_SiginfoArray(nsig);
	WFDB_SampleArray v = new WFDB_SampleArray(nsig);
	if (wfdb.isigopen(argv[0], s.cast(), nsig) != nsig)
	    System.exit(3);
	if (wfdb.isigsettime(wfdb.strtim(argv[1])) < 0)
	    System.exit(4);
	if ((nsamp = wfdb.strtim(argv[2])) < 1) {
	    System.out.println("example7: inappropriate value for duration");
	    System.exit(5);
	}
	if (wfdb.osigopen("16l", s.cast(), nsig) != nsig)
	    System.exit(6);

	wfdb.sample(0, 0);
	for (t = 0; t < nsamp && wfdb.sample_valid() == 1; t++) {
	    for (j = 0; j < nsig; j++) {
		for (i = 0, vv = 0.; i < nc; i++)
		    if (c[i] != 0.) vv += c[i]*wfdb.sample(j, t+i);
		v.setitem(j, (int)vv);
	    }
	    if (wfdb.putvec(v.cast()) < 0) break;
	}
	
	wfdb.newheader("out");
	wfdb.wfdbquit();
    }
}