package org.geogebra.common.kernel.statistics;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.arithmetic.BooleanValue;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.commands.CommandProcessor;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoFunction;
import org.geogebra.common.kernel.geos.GeoNumberValue;
import org.geogebra.common.main.MyError;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

/**
 * Exponential distribution
 */
public class CmdExponential extends CommandProcessor {

	/**
	 * Create new command processor
	 * 
	 * @param kernel
	 *            kernel
	 */
	public CmdExponential(Kernel kernel) {
		super(kernel);
	}

	@Override
	@SuppressFBWarnings({ "SF_SWITCH_FALLTHROUGH",
			"missing break is deliberate" })
	public GeoElement[] process(Command c) throws MyError {
		int n = c.getArgumentNumber();
		boolean[] ok = new boolean[n];
		GeoElement[] arg;

		arg = resArgs(c);

		BooleanValue cumulative = null; // default for n=2
		switch (n) {
		case 3:
			if (!arg[1].isGeoFunction() || !((GeoFunction) arg[1])
					.toString(StringTemplate.defaultTemplate).equals("x")) {
				throw argErr(app, c, arg[1]);
			}

			if (arg[2].isGeoBoolean()) {
				cumulative = (BooleanValue) arg[2];
			} else {
				throw argErr(app, c, arg[2]);
			}

			// fall through
		case 2:
			ok[0] = arg[0] instanceof GeoNumberValue;
			if (ok[0]) {
				if (arg[1].isGeoFunction() && ((GeoFunction) arg[1])
						.toString(StringTemplate.defaultTemplate).equals("x")) {

					AlgoExponentialDF algo = new AlgoExponentialDF(cons,
							c.getLabel(), (GeoNumberValue) arg[0], cumulative);
					return algo.getResult().asArray();

				} else if (arg[1] instanceof GeoNumberValue) {

					AlgoExponential algo = new AlgoExponential(cons,
							c.getLabel(), (GeoNumberValue) arg[0],
							(GeoNumberValue) arg[1]);

					GeoElement[] ret = { algo.getResult() };
					return ret;
				} else {
					throw argErr(app, c, arg[1]);
				}

			}
			throw argErr(app, c, arg[0]);

		default:
			throw argNumErr(app, c, n);
		}
	}
}