/*
    * 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.commons.configuration2;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.Properties;
  
  import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
  import org.apache.commons.configuration2.ex.ConversionException;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests some basic functions of the BaseConfiguration class. Missing keys might return null.
   */
  public class TestBaseNullConfiguration {
      protected BaseConfiguration config;
  
      @BeforeEach
      public void setUp() throws Exception {
          config = new BaseConfiguration();
          config.setListDelimiterHandler(new DefaultListDelimiterHandler(','));
          config.setThrowExceptionOnMissing(false);
      }
  
      @Test
      public void testCommaSeparatedString() {
          final String prop = "hey, that's a test";
          config.setProperty("prop.string", prop);
          final List<Object> list = config.getList("prop.string");
          assertEquals(Arrays.asList("hey", "that's a test"), list);
      }
  
      @Test
      public void testCommaSeparatedStringEscaped() {
          final String prop2 = "hey\\, that's a test";
          config.clearProperty("prop.string");
          config.setProperty("prop.string", prop2);
          assertEquals("hey, that's a test", config.getString("prop.string"));
      }
  
      @Test
      public void testGetBigDecimal() {
          config.setProperty("numberBigD", "123.456");
          final BigDecimal number = new BigDecimal("123.456");
          final BigDecimal defaultValue = new BigDecimal("654.321");
  
          assertEquals(number, config.getBigDecimal("numberBigD"));
          assertEquals(number, config.getBigDecimal("numberBigD", defaultValue));
          assertEquals(defaultValue, config.getBigDecimal("numberNotInConfig", defaultValue));
      }
  
      @Test
      public void testGetBigDecimalIncompatibleType() {
          config.setProperty("test.empty", "");
          assertThrows(ConversionException.class, () -> config.getBigDecimal("test.empty"));
      }
  
      @Test
      public void testGetBigDecimalUnknown() {
          assertNull(config.getBigDecimal("numberNotInConfig"));
      }
  
      @Test
      public void testGetBigInteger() {
          config.setProperty("numberBigI", "1234567890");
          final BigInteger number = new BigInteger("1234567890");
          final BigInteger defaultValue = new BigInteger("654321");
  
          assertEquals(number, config.getBigInteger("numberBigI"));
          assertEquals(number, config.getBigInteger("numberBigI", defaultValue));
          assertEquals(defaultValue, config.getBigInteger("numberNotInConfig", defaultValue));
      }
  
     @Test
     public void testGetBigIntegerIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getBigInteger("test.empty"));
     }
 
     @Test
     public void testGetBigIntegerUnknown() {
         assertNull(config.getBigInteger("numberNotInConfig"));
     }
 
     @Test
     public void testGetBoolean() {
         config.setProperty("boolA", Boolean.TRUE);
         final boolean boolT = true, boolF = false;
         assertEquals(boolT, config.getBoolean("boolA"));
         assertEquals(boolT, config.getBoolean("boolA", boolF));
         assertEquals(boolF, config.getBoolean("boolNotInConfig", boolF));
         assertEquals(Boolean.valueOf(boolT), config.getBoolean("boolA", Boolean.valueOf(boolF)));
     }
 
     @Test
     public void testGetBooleanIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getBoolean("test.empty"));
     }
 
     @Test
     public void testGetBooleanUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getBoolean("numberNotInConfig"));
     }
 
     @Test
     public void testGetByte() {
         config.setProperty("number", "1");
         final byte oneB = 1;
         final byte twoB = 2;
         assertEquals(oneB, config.getByte("number"));
         assertEquals(oneB, config.getByte("number", twoB));
         assertEquals(twoB, config.getByte("numberNotInConfig", twoB));
         assertEquals(Byte.valueOf(oneB), config.getByte("number", Byte.valueOf("2")));
     }
 
     @Test
     public void testGetByteIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getByte("test.empty"));
     }
 
     @Test
     public void testGetByteUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getByte("numberNotInConfig"));
     }
 
     @Test
     public void testGetDouble() {
         config.setProperty("numberD", "1.0");
         final double oneD = 1;
         final double twoD = 2;
         assertEquals(oneD, config.getDouble("numberD"), 0);
         assertEquals(oneD, config.getDouble("numberD", twoD), 0);
         assertEquals(twoD, config.getDouble("numberNotInConfig", twoD), 0);
         assertEquals(Double.valueOf(oneD), config.getDouble("numberD", Double.valueOf("2")));
     }
 
     @Test
     public void testGetDoubleIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getDouble("test.empty"));
     }
 
     @Test
     public void testGetDoubleUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getDouble("numberNotInConfig"));
     }
 
     @Test
     public void testGetFloat() {
         config.setProperty("numberF", "1.0");
         final float oneF = 1;
         final float twoF = 2;
         assertEquals(oneF, config.getFloat("numberF"), 0);
         assertEquals(oneF, config.getFloat("numberF", twoF), 0);
         assertEquals(twoF, config.getFloat("numberNotInConfig", twoF), 0);
         assertEquals(Float.valueOf(oneF), config.getFloat("numberF", Float.valueOf("2")));
     }
 
     @Test
     public void testGetFloatIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getFloat("test.empty"));
     }
 
     @Test
     public void testGetFloatUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getFloat("numberNotInConfig"));
     }
 
     @Test
     public void testGetList() {
         config.addProperty("number", "1");
         config.addProperty("number", "2");
         final List<Object> list = config.getList("number");
         assertEquals(Arrays.asList("1", "2"), list);
     }
 
     @Test
     public void testGetListAsScalar() {
         config.addProperty("number", "1");
         config.addProperty("number", "2");
         assertEquals("1", config.getString("number"));
     }
 
     @Test
     public void testGetLong() {
         config.setProperty("numberL", "1");
         final long oneL = 1;
         final long twoL = 2;
         assertEquals(oneL, config.getLong("numberL"));
         assertEquals(oneL, config.getLong("numberL", twoL));
         assertEquals(twoL, config.getLong("numberNotInConfig", twoL));
         assertEquals(Long.valueOf(oneL), config.getLong("numberL", Long.valueOf("2")));
     }
 
     @Test
     public void testGetLongIncompatibleTypes() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getLong("test.empty"));
     }
 
     @Test
     public void testGetLongUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getLong("numberNotInConfig"));
     }
 
     @Test
     public void testGetProperty() {
         /* should be empty and return null */
         assertNull(config.getProperty("foo"));
 
         /* add a real value, and get it two different ways */
         config.setProperty("number", "1");
         assertEquals("1", config.getProperty("number"));
         assertEquals("1", config.getString("number"));
     }
 
     @Test
     public void testGetShort() {
         config.setProperty("numberS", "1");
         final short oneS = 1;
         final short twoS = 2;
         assertEquals(oneS, config.getShort("numberS"));
         assertEquals(oneS, config.getShort("numberS", twoS));
         assertEquals(twoS, config.getShort("numberNotInConfig", twoS));
         assertEquals(Short.valueOf(oneS), config.getShort("numberS", Short.valueOf("2")));
     }
 
     @Test
     public void testGetShortIncompatibleType() {
         config.setProperty("test.empty", "");
         assertThrows(ConversionException.class, () -> config.getShort("test.empty"));
     }
 
     @Test
     public void testGetShortUnknown() {
         assertThrows(NoSuchElementException.class, () -> config.getShort("numberNotInConfig"));
     }
 
     @Test
     public void testGetString() {
         config.setProperty("testString", "The quick brown fox");
         final String string = "The quick brown fox";
         final String defaultValue = "jumps over the lazy dog";
 
         assertEquals(string, config.getString("testString"));
         assertEquals(string, config.getString("testString", defaultValue));
         assertEquals(defaultValue, config.getString("stringNotInConfig", defaultValue));
     }
 
     @Test
     public void testGetStringUnknown() {
         assertNull(config.getString("stringNotInConfig"));
     }
 
     @Test
     public void testInterpolation() throws Exception {
         config.setProperty("applicationRoot", "/home/applicationRoot");
         config.setProperty("db", "${applicationRoot}/db/hypersonic");
         final String unInterpolatedValue = "${applicationRoot2}/db/hypersonic";
         config.setProperty("dbFailedInterpolate", unInterpolatedValue);
         final String dbProp = "/home/applicationRoot/db/hypersonic";
 
         // construct a new config, using config as the defaults config for it.
         final BaseConfiguration superProp = config;
 
         assertEquals(dbProp, superProp.getString("db"));
         assertEquals(unInterpolatedValue, superProp.getString("dbFailedInterpolate"));
 
         superProp.setProperty("arrayInt", "${applicationRoot}/1");
         final String[] arrayInt = superProp.getStringArray("arrayInt");
         assertEquals("/home/applicationRoot/1", arrayInt[0]);
     }
 
     @Test
     public void testInterpolationLoop() throws Exception {
         config.setProperty("test.a", "${test.b}");
         config.setProperty("test.b", "${test.a}");
         assertThrows(IllegalStateException.class, () -> config.getString("test.a"));
     }
 
     @Test
     public void testMultipleInterpolation() throws Exception {
         config.setProperty("test.base-level", "/base-level");
         config.setProperty("test.first-level", "${test.base-level}/first-level");
         config.setProperty("test.second-level", "${test.first-level}/second-level");
         config.setProperty("test.third-level", "${test.second-level}/third-level");
 
         final String expectedValue = "/base-level/first-level/second-level/third-level";
 
         assertEquals(expectedValue, config.getString("test.third-level"));
     }
 
     @Test
     public void testPropertyAccess() {
         config.clearProperty("prop.properties");
         config.setProperty("prop.properties", "");
         assertEquals(new Properties(), config.getProperties("prop.properties"));
         config.clearProperty("prop.properties");
         config.setProperty("prop.properties", "foo=bar, baz=moo, seal=clubber");
 
         final Properties p = new Properties();
         p.setProperty("foo", "bar");
         p.setProperty("baz", "moo");
         p.setProperty("seal", "clubber");
         assertEquals(p, config.getProperties("prop.properties"));
     }
 
     @Test
     public void testSubset() {
         /*
          * test subset : assure we don't reprocess the data elements when generating the subset
          */
 
         final String prop = "hey, that's a test";
         final String prop2 = "hey\\, that's a test";
         config.setProperty("prop.string", prop2);
         config.setProperty("property.string", "hello");
 
         Configuration subEprop = config.subset("prop");
 
         assertEquals(prop, subEprop.getString("string"));
         assertEquals(1, subEprop.getList("string").size());
 
         Iterator<String> it = subEprop.getKeys();
         it.next();
         assertFalse(it.hasNext());
 
         subEprop = config.subset("prop.");
         it = subEprop.getKeys();
         assertFalse(it.hasNext());
     }
 
     @Test
     public void testThrowExceptionOnMissing() {
         assertFalse(config.isThrowExceptionOnMissing());
     }
 }