package dalclient;

/**
 * Call the SDSS finding chart service and download a graphics image
 * of the given coordinates and size.
 *
 * Usage:	chart ra dec size [serviceURL]
 *
 * Or call with no args for the built-in unit test.
 */
public class chart {
    // Default query params if none specified on cmdline (for unit test).
    private static final String SERVICE = "http://casjobs.sdss.org/vo/DR4SIAP/SIAP.asmx/getSiapInfo?&FORMAT=image/jpeg&BANDPASS=*&";
    private static final double DEF_RA=258.127, DEF_DEC=64.017, DEF_SIZE=0.4;

    public static void main(String args[]) throws Exception {
	double ra=DEF_RA, dec=DEF_DEC, size=DEF_SIZE;
	String service = SERVICE;
	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: chart ra dec size [URL]");
	    System.exit(1);
	}

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

    /* Simple test routine to download the first image from a cutout service.
     */
    static void callGetChart(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);

	// Enable the graphics overlay (SDSS specific parameter).
	query.addParameter("opt", "G");

	// 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);
	}

	// Download the image.
	QueryRecord r = qr.getRecord(0);
	String path = r.getDataset();
	if (path != null)
	    System.out.println("Downloaded " + path);
	else
	    System.out.print("Download failed");
    }
}