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package jscl.math;

import jscl.math.function.Constant;

import javax.annotation.Nonnull;
import java.util.Collections;
import java.util.Set;

public class TechnicalVariable extends Variable {
	public int subscript[];

	public TechnicalVariable(String name) {
		this(name, new int[0]);
	}

	public TechnicalVariable(String name, int subscript[]) {
		super(name);
		this.subscript = subscript;
	}

	public Generic antiDerivative(Variable variable) throws NotIntegrableException {
		throw new NotIntegrableException(this);
	}

	@Nonnull
	public Generic derivative(Variable variable) {
		if (isIdentity(variable)) return JsclInteger.valueOf(1);
		else return JsclInteger.valueOf(0);
	}

	public Generic substitute(Variable variable, Generic generic) {
		if (isIdentity(variable)) return generic;
		else return expressionValue();
	}

	public Generic expand() {
		return expressionValue();
	}

	public Generic factorize() {
		return expressionValue();
	}

	public Generic elementary() {
		return expressionValue();
	}

	public Generic simplify() {
		return expressionValue();
	}

	public Generic numeric() {
		throw new ArithmeticException("Could not evaluate numeric value for technical variable!");
	}

	public boolean isConstant(Variable variable) {
		return !isIdentity(variable);
	}

	public int compareTo(Variable variable) {
		if (this == variable) return 0;
		int c = comparator.compare(this, variable);
		if (c < 0) return -1;
		else if (c > 0) return 1;
		else {
			TechnicalVariable v = (TechnicalVariable) variable;
			c = name.compareTo(v.name);
			if (c < 0) return -1;
			else if (c > 0) return 1;
			else return compareSubscript(subscript, v.subscript);
		}
	}

	public int compareSubscript(int c1[], int c2[]) {
		if (c1.length < c2.length) return -1;
		else if (c1.length > c2.length) return 1;
		for (int i = 0; i < c1.length; i++) {
			if (c1[i] < c2[i]) return -1;
			else if (c1[i] > c2[i]) return 1;
		}
		return 0;
	}

	public String toString() {
		StringBuffer buffer = new StringBuffer();
		buffer.append(name);
		if (subscript.length == 1) buffer.append(subscript[0]);
		else for (int i = 0; i < subscript.length; i++) buffer.append("[").append(subscript[i]).append("]");
		return buffer.toString();
	}

	public String toJava() {
		return null;
	}

	public String toMathML(Object data) {
		return null;
	}

	@Nonnull
	public Variable newInstance() {
		return new TechnicalVariable(name);
	}

	@Nonnull
	@Override
	public Set getConstants() {
		// todo serso: check
		return Collections.emptySet();
	}
}