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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;

public class Substring extends AbstractFunction {

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

    static {
        desc.add("String to get part of");
        desc.add("Begin index (first is 0)");
        desc.add("End index");
        desc.add("Name of variable in which to store the result (optional)");
    }

    private Object[] values;

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

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

        Double sum = 0D;
        String str = getParameter(0);

        int begin = Integer.parseInt(getParameter(1));
        int len = Integer.parseInt(getParameter(2));

        String totalString = str.substring(begin, len);

        JMeterVariables vars = getVariables();

        String varName = getParameter(3);
        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, 3);
        values = parameters.toArray();
    }

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

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

    private String getParameter(int i) {
        return ((CompoundVariable) values[i]).execute();
    }
}