/*
 * 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.apache.solr.common.params;

import org.apache.lucene.util.LuceneTestCase;

import java.util.HashMap;
import java.util.Map;

/**
 * Unit Test Case for {@link org.apache.solr.common.params.ModifiableSolrParams
 * ModifiableSolrParams}
 */
public class ModifiableSolrParamsTest extends LuceneTestCase {

  @Override
  public void setUp() throws Exception
  {
    super.setUp();
    modifiable = new ModifiableSolrParams();
  }


  @Override
  public void tearDown() throws Exception
  {
    modifiable.clear();
    super.tearDown();
  }

  public void testOf() throws Exception
  {
    String key = "key";
    String value = "value";

    // input is not of type ModifiableSolrParams
    Map<String, String> values = new HashMap<>();
    values.put(key, value);
    SolrParams mapParams = new MapSolrParams(values);
    ModifiableSolrParams result = ModifiableSolrParams.of(mapParams);
    assertNotSame(mapParams, result);
    assertEquals(value, result.get(key));

    // input is of type ModifiableSolrParams
    modifiable.add(key, value);
    result = ModifiableSolrParams.of(modifiable);
    assertSame(result, modifiable);

    // input is null
    result = ModifiableSolrParams.of(null);
    assertNotNull(result);
    assertEquals(0, result.size());
  }

  public void testAdd()
  {

    String key = "key";
    String[] values = new String[1];
    values[0] = null;
    modifiable.add(key, values);
    String[] result = modifiable.getParams(key);
    assertArrayEquals("params", values, result);
  }


  public void testAddNormal()
  {

    String key = "key";
    String[] helloWorld = new String[] { "Hello", "World" };
    String[] universe = new String[] { "Universe" };
    String[] helloWorldUniverse = new String[] { "Hello", "World", "Universe" };
    modifiable.add(key, helloWorld);
    assertArrayEquals("checking Hello World: ", helloWorld, modifiable.getParams(key));

    modifiable.add(key, universe);
    String[] result = modifiable.getParams(key);
    compareArrays("checking Hello World Universe ", helloWorldUniverse, result);
  }


  public void testAddNull()
  {

    String key = "key";
    String[] helloWorld = new String[] { "Hello", "World" };
    String[] universe = new String[] { null };
    String[] helloWorldUniverse = new String[] { "Hello", "World", null };
    modifiable.add(key, helloWorld);
    assertArrayEquals("checking Hello World: ", helloWorld, modifiable.getParams(key));

    modifiable.add(key, universe);
    String[] result = modifiable.getParams(key);
    compareArrays("checking Hello World Universe ", helloWorldUniverse, result);
  }


  public void testOldZeroLength()
  {

    String key = "key";
    String[] helloWorld = new String[] {};
    String[] universe = new String[] { "Universe" };
    String[] helloWorldUniverse = new String[] { "Universe" };
    modifiable.add(key, helloWorld);
    assertArrayEquals("checking Hello World: ", helloWorld, modifiable.getParams(key));

    modifiable.add(key, universe);
    String[] result = modifiable.getParams(key);
    compareArrays("checking Hello World Universe ", helloWorldUniverse, result);
  }


  public void testAddPseudoNull()
  {

    String key = "key";
    String[] helloWorld = new String[] { "Hello", "World" };
    String[] universe = new String[] { "Universe", null };
    String[] helloWorldUniverse = new String[] { "Hello", "World", "Universe", null };
    modifiable.add(key, helloWorld);
    assertArrayEquals("checking Hello World: ", helloWorld, modifiable.getParams(key));

    modifiable.add(key, universe);
    String[] result = modifiable.getParams(key);
    compareArrays("checking Hello World Universe ", helloWorldUniverse, result);
  }


  private void compareArrays(String prefix,
                             String[] expected,
                             String[] actual)
  {
    assertEquals(prefix + "length: ", expected.length, actual.length);
    for (int i = 0; i < expected.length; ++i)
    {
      assertEquals(prefix + " index  " + i, expected[i], actual[i]);
    }
  }

  private ModifiableSolrParams modifiable;
}