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/*
 * Licensed to Laurent Broudoux (the "Author") under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Author licenses this
 * file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package io.github.microcks.util.el.function;

import io.github.microcks.util.el.EvaluationContext;

import java.util.Random;

/**
 * This is an implementation of ELFunction that generates random integer values.
 * When invoked with no arg a integer between Integer.MIN_VALUE and
 * Integer.MAX_VALUE is generated. When invoked with one argument, a
 * positive integer bounded by arg value is generated. When invoked with 2 arguments,
 * an integer in designated intervfal is generated.
 * @author laurent
 */
public class RandomIntELFunction implements ELFunction {

   @Override
   public String evaluate(EvaluationContext evaluationContext, String... args) {
      Random generator = new Random();

      if (args != null) {
         switch (args.length) {
            case 1:
               int maxValue = Integer.MAX_VALUE;
               try {
                  maxValue = Integer.parseInt(args[0]);
               } catch (NumberFormatException nfe) {
                  // Ignore, we'll stick to integer max value.
               }
               return String.valueOf(generator.nextInt(maxValue));
            case 2:
               int minValue = 0;
               maxValue = Integer.MAX_VALUE;
               try {
                  minValue = Integer.parseInt(args[0]);
                  maxValue = Integer.parseInt(args[1]);
               } catch (NumberFormatException nfe) {
                  // Ignore, we'll stick to the defaults.
               }
               return String.valueOf(generator.nextInt(maxValue - minValue) + minValue);
            default:
               return String.valueOf(generator.nextInt());
         }
      }
      return String.valueOf(generator.nextInt());
   }
}