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package jscl.math.operator.vector;

import jscl.math.Generic;
import jscl.math.GenericVariable;
import jscl.math.JsclVector;
import jscl.math.Variable;
import jscl.math.function.Constant;
import jscl.math.operator.Operator;
import jscl.math.operator.VectorOperator;
import jscl.mathml.MathML;

import javax.annotation.Nonnull;

public class Jacobian extends VectorOperator {

	public static final String NAME = "jacobian";

	public Jacobian(Generic vector, Generic variable) {
		super(NAME, new Generic[]{vector, variable});
	}

	private Jacobian(Generic parameter[]) {
		super(NAME, parameter);
	}

	@Override
	public int getMinParameters() {
		return 2;
	}

	public Generic selfExpand() {
		Variable variable[] = toVariables(parameters[1]);
		if (parameters[0] instanceof JsclVector) {
			JsclVector vector = (JsclVector) parameters[0];
			return vector.jacobian(variable);
		}
		return expressionValue();
	}

	@Nonnull
	@Override
	public Operator newInstance(@Nonnull Generic[] parameters) {
		return new Jacobian(parameters);
	}

	protected void bodyToMathML(MathML element) {
		operator(element, "nabla");
		MathML e1 = element.element("msup");
		parameters[0].toMathML(e1, null);
		MathML e2 = element.element("mo");
		e2.appendChild(element.text("T"));
		e1.appendChild(e2);
		element.appendChild(e1);
	}

	protected void operator(MathML element, String name) {
		Variable variable[] = toVariables(GenericVariable.content(parameters[1]));
		MathML e1 = element.element("msubsup");
		new Constant(name).toMathML(e1, null);
		MathML e2 = element.element("mrow");
		for (int i = 0; i < variable.length; i++) variable[i].expressionValue().toMathML(e2, null);
		e1.appendChild(e2);
		e2 = element.element("mo");
		e2.appendChild(element.text("T"));
		e1.appendChild(e2);
		element.appendChild(e1);
	}

	@Nonnull
	public Variable newInstance() {
		return new Jacobian(null, null);
	}
}