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 StrReplaceRegex extends AbstractFunction {

    private static final List<String> desc = new LinkedList<>();
    private static final String KEY = "__strReplaceRegex";

    static {
        desc.add("String to get part of");
        desc.add("Search regular expression");
        desc.add("Replacement");
        desc.add("Name of variable in which to store the result (optional)");
    }

    private Object[] values;

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

        String totalString = getParameter(0).replaceAll(getParameter(1), getParameter(2));

        JMeterVariables vars = getVariables();

        if (values.length > 3) {
            String varName = getParameter(3);
            if (vars != null && varName != null && varName.length() > 0) {// vars will be null on TestPlan
                vars.put(varName, totalString);
            }
        }

        return totalString;
    }

    @Override
    public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {
        checkMinParameterCount(parameters, 3);
        values = parameters.toArray();
    }

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

    @Override
    public List<String> getArgumentDesc() {
        return desc;
    }

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