/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF 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 org.example;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.commons.jexl3.JexlBuilder;
  import org.apache.commons.jexl3.JexlContext;
  import org.apache.commons.jexl3.JexlEngine;
  import org.apache.commons.jexl3.JexlExpression;
  import org.apache.commons.jexl3.JexlScript;
  import org.apache.commons.jexl3.MapContext;
  import org.apache.commons.jexl3.internal.Engine;
  import org.apache.commons.jexl3.internal.TemplateInterpreter;
  import org.apache.commons.jexl3.introspection.JexlPermissions;
  import org.apache.commons.jexl3.parser.JexlNode;
  import org.junit.jupiter.api.Test;
  
  public class SomeTest {
  
    /**
     * Engine creating dedicated template interpreter.
     */
    public static class Engine406 extends Engine {
      public Engine406(final JexlBuilder conf) {
        super(conf);
      }
      @Override public TemplateInterpreter createTemplateInterpreter(final TemplateInterpreter.Arguments args) {
        return new TemplateInterpreter406(args);
      }
    }
  
    public static class MyMath {
      public double cos(final double x) {
        return Math.cos(x);
      }
    }
  
    public static class TemplateInterpreter406 extends TemplateInterpreter {
      protected TemplateInterpreter406(final Arguments args) {
        super(args);
      }
      @Override
      public Object interpret(final JexlNode node) {
        CALL406.incrementAndGet();
        return super.interpret(node);
      }
    }
  
    /** Counting the number of node interpretation calls. */
    static AtomicInteger CALL406 = new AtomicInteger();
  
    @Test
    public void test406b() {
      final JexlEngine jexl = new JexlBuilder() {
        @Override
        public JexlEngine create() {
          return new Engine406(this);
        }
      }.cache(64).strict(true).safe(false).create();
      final String src = "`Call ${x}`";
      final JexlScript script = jexl.createScript(src, "x");
      Object result = script.execute(null, 406);
      assertEquals("Call 406", result);
      assertEquals(1, CALL406.get());
      result = script.execute(null, 42);
      assertEquals("Call 42", result);
      assertEquals(2, CALL406.get());
    }
  
    /**
     * User namespace needs to be allowed through permissions.
     */
    @Test
    public void testCustomFunctionPermissions() {
        final Map<String, Object> funcs = new HashMap<>();
        funcs.put("math", new MyMath());
        final JexlPermissions permissions = JexlPermissions.parse("org.example.*");
        final JexlEngine jexl = new JexlBuilder().permissions(permissions).namespaces(funcs).create();
        final JexlContext jc = new MapContext();
        jc.set("pi", Math.PI);
       final JexlExpression e = jexl.createExpression("math:cos(pi)");
       final Number result = (Number) e.evaluate(jc);
       assertEquals(-1, result.intValue());
   }
 }