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package kg.apc.jmeter.functions;

import org.apache.jmeter.engine.util.CompoundVariable;
import org.apache.jmeter.functions.AbstractFunction;
import org.apache.jmeter.functions.InvalidVariableException;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.threads.JMeterVariables;

import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

/**
 * Provides a DoubleSum function that adds two or more Double values.
 * Mostly copied from LongSum
 */
public class DoubleSum extends AbstractFunction {

    private static final List desc = new LinkedList();
    private static final String KEY = "__doubleSum";

    static {
        desc.add("First double to add");
        desc.add("Second long to add - further doubles can be summed by adding further arguments");
        desc.add("Name of variable in which to store the result (optional)");
    }

    private Object[] values;

    /**
     * No-arg constructor.
     */
    public DoubleSum() {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized String execute(SampleResult previousResult, Sampler currentSampler)
            throws InvalidVariableException {

        JMeterVariables vars = getVariables();

        Double sum = 0D;
        String varName = ((CompoundVariable) values[values.length - 1]).execute().trim();

        for (int i = 0; i < values.length - 1; i++) {
            sum += Double.parseDouble(((CompoundVariable) values[i]).execute());
        }

        try {
            sum += Double.parseDouble(varName);
            varName = null; // there is no variable name
        } catch (NumberFormatException ignored) {
        }

        String totalString = Double.toString(sum);
        if (vars != null && varName != null && varName.length() > 0) {// vars will be null on TestPlan
            vars.put(varName, totalString);
        }

        return totalString;

    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void setParameters(Collection parameters) throws InvalidVariableException {
        checkMinParameterCount(parameters, 2);
        values = parameters.toArray();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getReferenceKey() {
        return KEY;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public List getArgumentDesc() {
        return desc;
    }
}