package dalclient;

/**
 * Call a Simple Image Access (SIA) service and print selected fields of
 * the query result table.
 *
 * Usage:	siap1 ra dec size [serviceURL]
 *
 * Or call with no args for the built-in unit test.
 */
public class siap1 {
    // 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;

    public static void main(String args[]) throws Exception {
	String service = DEF_SERVICE;
	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) 
		service = args[arg++];
	} else {
	    System.out.println("Usage: siap1 ra dec size [siapURL]");
	    System.exit(1);
	}

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

    /* Simple test routine to call a SIA service and summarize results.
     */
    static void callSiapService(String service,
	    double ra, double dec, double size) 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 and fetch results.
	System.out.println("# Query: " + query.getQueryString(0));
	QueryResponse qr = query.execute();
	if (qr.getRecordCount() <= 0) {
	    System.out.println("no images found");
	    System.exit(1);
	}

	// Summarize query response.
	{
	    int nrec = qr.getRecordCount();
	    QueryRecord r = qr.getRecord(0);
	    int nattr = (r != null) ? r.getAttributeCount() : 0;
	    System.out.println("# returns " + nrec + " records containing " +
		nattr + " attributes each");
	    System.out.println("# --- Summary output ---");
	}

	// Summarize and print selected query results.
	for (int i=0;  i < qr.getRecordCount();  i++) {
	    QueryRecord r = qr.getRecord(i);
	    String s_ra, s_dec, s_naxes, s_naxis, s_format, s_title;
	    QRAttribute v;

	    s_ra = ((v = r.getAttribute("RA")) != null) ?
		v.stringValue() : "<unknown>";
	    s_dec = ((v = r.getAttribute("DEC")) != null) ?
		v.stringValue() : "<unknown>";
	    s_naxes = ((v = r.getAttribute("Naxes")) != null) ?
		v.stringValue() : "<unknown>";
	    s_naxis = ((v = r.getAttribute("Naxis")) != null) ?
		v.stringValue() : "<unknown>";
	    s_format = ((v = r.getAttribute("ImageFormat")) != null) ?
		v.stringValue() : "<unknown>";
	    s_title = ((v = r.getAttribute("Title")) != null) ?
		v.stringValue() : (((v = r.getAttribute("ID_MAIN")) != null) ?
		v.stringValue() : "<unknown>");


	    System.out.println(
		"ra=" + atmost(s_ra,10) + "\tdec=" + atmost(s_dec,10) +
		"\t[" + s_naxis + "]\t" + s_format + "\t" +
		atmost(s_title,32));
	}
	
    }

    /* Return at most N chars from string S. */
    private static String atmost(String s, int n) {
	return (s.substring(0, (s.length() < n) ? s.length() : n));
    }
}