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package com.codetaco.math.impl.function;

import com.codetaco.math.impl.Function;
import com.codetaco.math.impl.ValueStack;
import com.codetaco.math.impl.token.TokVariable;

import java.text.ParseException;

/**
 * 
 * FuncAtan class.
 * 
 *
 * @author Chris DeGreef [email protected]
 * @since 1.3.9
 */
public class FuncAtan extends Function {
    /**
     * 
     * Constructor for FuncAtan.
     * 
     */
    public FuncAtan() {
        super();
    }

    /**
     * 
     * Constructor for FuncAtan.
     * 
     *
     * @param var a {@link com.codetaco.math.impl.token.TokVariable} object.
     */
    public FuncAtan(final TokVariable var) {
        super(var);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void resolve(final ValueStack values) throws Exception {
        if (values.size() < 1) {
            throw new Exception("missing operands for " + toString());
        }
        try {
            values.push(new Double(Math.atan(values.popDouble()) * 180 / Math.PI));
        } catch (final ParseException e) {
            e.fillInStackTrace();
            throw new Exception(toString() + "; " + e.getMessage(), e);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "function(acotan)";
    }
}