package dalclient;

import java.io.*;


/**
 * Call a Simple Image Access (SIA) service and save the results in a VOTable.
 *
 * Usage:	siap3 ra dec size [fname [serviceURL]]
 *
 * Or call with no args for the built-in unit test.
 */
public class siap3 {
    // Default query params if none specified on cmdline (for unit test).
    private static final String DEF_SERVICE =
	"http://skyview.gsfc.nasa.gov/cgi-bin/vo/sia.pl?";
    private static final double DEF_RA=12.0, DEF_DEC=0.0, DEF_SIZE=0.5;
    private static String FNAME = "siap3.xml";

    public static void main(String args[]) throws Exception {
	String service = DEF_SERVICE, fname = FNAME;
	double ra=DEF_RA, dec=DEF_DEC, size=DEF_SIZE;
	int arg = 0;

	if (args.length == 0) {
	    // Built-in no-args unit test.
	} else if (args.length >= 3) {
	    ra = Double.parseDouble(args[arg++]);
	    dec = Double.parseDouble(args[arg++]);
	    size = Double.parseDouble(args[arg++]);
	    if (arg < args.length) 
		fname = args[arg++];
	    if (arg < args.length) 
		service = args[arg++];
	} else {
	    System.out.println("Usage: siap3 ra dec size [fname [siapURL]]");
	    System.exit(1);
	}

	callSiapService(service, ra, dec, size, fname);
    }

    /* Simple test routine to call a SIA service and save the query response
     * VOTable in a file.
     */
    static void callSiapService(String service,
	    double ra, double dec, double size, String fname) throws Exception {

	// Get a new connection to the service.
	SiapConnection siap = new SiapConnection(service);

	// Form the query.
	SiapQuery query = siap.getSiapQuery(ra, dec, size);

	// Execute the query.
	System.out.println("# Query: " + query.getQueryString(0));
	InputStream in = query.executeRaw();

	// Copy the query result VOTable to the name output file, overwriting
	// it if the file already exists.

	System.out.println("# copying query result VOTable to file " + fname);
	File file = new File(fname);  file.delete();
	FileOutputStream out = new FileOutputStream(file);

	byte buf[] = new byte[4096];  int n;
	while ((n = in.read(buf, 0, buf.length)) > 0)
	    out.write(buf, 0, n);
    }
}