/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed 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 com.google.gson.functional;

import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import com.google.gson.common.TestTypes.ArrayOfObjects;
import com.google.gson.common.TestTypes.BagOfPrimitiveWrappers;
import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.common.TestTypes.ClassOverridingEquals;
import com.google.gson.common.TestTypes.ClassWithArray;
import com.google.gson.common.TestTypes.ClassWithNoFields;
import com.google.gson.common.TestTypes.ClassWithObjects;
import com.google.gson.common.TestTypes.ClassWithTransientFields;
import com.google.gson.common.TestTypes.MyEnum;
import com.google.gson.common.TestTypes.Nested;
import com.google.gson.common.TestTypes.PrimitiveArray;

import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

/**
 * Functional tests for Json serialization and deserialization of regular classes.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public class ObjectTest extends TestCase {
  private Gson gson;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    gson = new Gson();
  }

  public void testBagOfPrimitivesSerialization() throws Exception {
    BagOfPrimitives target = new BagOfPrimitives(10, 20, false, "stringValue");
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testBagOfPrimitivesDeserialization() throws Exception {
    BagOfPrimitives src = new BagOfPrimitives(10, 20, false, "stringValue");
    String json = src.getExpectedJson();
    BagOfPrimitives target = gson.fromJson(json, BagOfPrimitives.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testBagOfPrimitiveWrappersSerialization() throws Exception {
    BagOfPrimitiveWrappers target = new BagOfPrimitiveWrappers(10L, 20, false);
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testBagOfPrimitiveWrappersDeserialization() throws Exception {
    BagOfPrimitiveWrappers target = new BagOfPrimitiveWrappers(10L, 20, false);
    String jsonString = target.getExpectedJson();
    target = gson.fromJson(jsonString, BagOfPrimitiveWrappers.class);
    assertEquals(jsonString, target.getExpectedJson());
  }

  public void testDirectedAcyclicGraphSerialization() throws Exception {
    ContainsReferenceToSelfType a = new ContainsReferenceToSelfType();
    ContainsReferenceToSelfType b = new ContainsReferenceToSelfType();
    ContainsReferenceToSelfType c = new ContainsReferenceToSelfType();
    a.children.add(b);
    a.children.add(c);
    b.children.add(c);
    assertNotNull(gson.toJson(a));
  }

  public void testDirectedAcyclicGraphDeserialization() throws Exception {
    String json = "{\"children\":[{\"children\":[{\"children\":[]}]},{\"children\":[]}]}";
    ContainsReferenceToSelfType target = gson.fromJson(json, ContainsReferenceToSelfType.class);
    assertNotNull(target);
    assertEquals(2, target.children.size());
  }

  public void testClassWithTransientFieldsSerialization() throws Exception {
    ClassWithTransientFields target = new ClassWithTransientFields(1L);
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testClassWithTransientFieldsDeserialization() throws Exception {
    String json = "{\"longValue\":[1]}";
    ClassWithTransientFields target = gson.fromJson(json, ClassWithTransientFields.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testClassWithTransientFieldsDeserializationTransientFieldsPassedInJsonAreIgnored()
      throws Exception {
    String json = "{\"transientLongValue\":1,\"longValue\":[1]}";
    ClassWithTransientFields target = gson.fromJson(json, ClassWithTransientFields.class);
    assertFalse(target.transientLongValue != 1);
  }

  public void testClassWithNoFieldsSerialization() throws Exception {
    assertEquals("{}", gson.toJson(new ClassWithNoFields()));
  }

  public void testClassWithNoFieldsDeserialization() throws Exception {
    String json = "{}";
    ClassWithNoFields target = gson.fromJson(json, ClassWithNoFields.class);
    ClassWithNoFields expected = new ClassWithNoFields();
    assertEquals(expected, target);
  }

  public void testNestedSerialization() throws Exception {
    Nested target = new Nested(new BagOfPrimitives(10, 20, false, "stringValue"),
       new BagOfPrimitives(30, 40, true, "stringValue"));
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testNestedDeserialization() throws Exception {
    String json = "{\"primitive1\":{\"longValue\":10,\"intValue\":20,\"booleanValue\":false,"
        + "\"stringValue\":\"stringValue\"},\"primitive2\":{\"longValue\":30,\"intValue\":40,"
        + "\"booleanValue\":true,\"stringValue\":\"stringValue\"}}";
    Nested target = gson.fromJson(json, Nested.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testInheritenceSerialization() throws Exception {
    SubTypeOfNested target = new SubTypeOfNested(new BagOfPrimitives(10, 20, false, "stringValue"),
        new BagOfPrimitives(30, 40, true, "stringValue"));
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testInheritenceDeserialization() throws Exception {
    String json = "{\"value\":5,\"primitive1\":{\"longValue\":10,\"intValue\":20,"
        + "\"booleanValue\":false,\"stringValue\":\"stringValue\"},\"primitive2\":"
        + "{\"longValue\":30,\"intValue\":40,\"booleanValue\":true,"
        + "\"stringValue\":\"stringValue\"}}";
    SubTypeOfNested target = gson.fromJson(json, SubTypeOfNested.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testNullSerialization() throws Exception {
    assertEquals("", gson.toJson(null));
  }

  public void testNullDeserialization() throws Exception {
    try {
      gson.fromJson("", Object.class);
      fail("Null strings should not be allowed");
    } catch (JsonParseException expected) {
    }
  }

  public void testNullFieldsSerialization() throws Exception {
    Nested target = new Nested(new BagOfPrimitives(10, 20, false, "stringValue"), null);
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testNullFieldsDeserialization() throws Exception {
    String json = "{\"primitive1\":{\"longValue\":10,\"intValue\":20,\"booleanValue\":false"
        + ",\"stringValue\":\"stringValue\"}}";
    Nested target = gson.fromJson(json, Nested.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testArrayOfObjectsSerialization() throws Exception {
    ArrayOfObjects target = new ArrayOfObjects();
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testArrayOfObjectsDeserialization() throws Exception {
    String json = new ArrayOfObjects().getExpectedJson();
    ArrayOfObjects target = gson.fromJson(json, ArrayOfObjects.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testArrayOfArraysSerialization() throws Exception {
    ArrayOfArrays target = new ArrayOfArrays();
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testArrayOfArraysDeserialization() throws Exception {
    String json = new ArrayOfArrays().getExpectedJson();
    ArrayOfArrays target = gson.fromJson(json, ArrayOfArrays.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testClassWithEnumFieldSerialization() throws Exception {
    ClassWithEnumFields target = new ClassWithEnumFields();
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testClassWithEnumFieldDeserialization() throws Exception {
    String json = new ClassWithEnumFields().getExpectedJson();
    ClassWithEnumFields target = gson.fromJson(json, ClassWithEnumFields.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testTopLevelEnumSerialization() throws Exception {
    MyEnum target = MyEnum.VALUE1;
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testTopLevelEnumDeserialization() throws Exception {
    String json = MyEnum.VALUE1.getExpectedJson();
    MyEnum target = gson.fromJson(json, MyEnum.class);
    assertEquals(json, target.getExpectedJson());
  }

  public void testSubInterfacesOfCollectionSerialization() throws Exception {
    List<Integer> list = new LinkedList<Integer>();
    list.add(0);
    list.add(1);
    list.add(2);
    list.add(3);
    Queue<Long> queue = new LinkedList<Long>();
    queue.add(0L);
    queue.add(1L);
    queue.add(2L);
    queue.add(3L);
    Set<Float> set = new TreeSet<Float>();
    set.add(0.1F);
    set.add(0.2F);
    set.add(0.3F);
    set.add(0.4F);
    SortedSet<Character> sortedSet = new TreeSet<Character>();
    sortedSet.add('a');
    sortedSet.add('b');
    sortedSet.add('c');
    sortedSet.add('d');
    ClassWithSubInterfacesOfCollection target =
        new ClassWithSubInterfacesOfCollection(list, queue, set, sortedSet);
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public void testSubInterfacesOfCollectionDeserialization() throws Exception {
    String json = "{\"list\":[0,1,2,3],\"queue\":[0,1,2,3],\"set\":[0.1,0.2,0.3,0.4],"
        + "\"sortedSet\":[\"a\",\"b\",\"c\",\"d\"]"
//        + ",\"navigableSet\":[\"abc\",\"def\",\"ghi\",\"jkl\"]"
        + "}";
    ClassWithSubInterfacesOfCollection target = gson.fromJson(
        json, ClassWithSubInterfacesOfCollection.class);
    assertEquals(json, target.getExpectedJson());
  }

  /**
   * Created in response to Issue 14: http://code.google.com/p/google-gson/issues/detail?id=14
   */
  public void testNullArraysDeserialization() throws Exception {
    String json = "{\"array\": null}";
    ClassWithArray target = gson.fromJson(json, ClassWithArray.class);
    assertNull(target.array);
  }

  /**
   * Created in response to Issue 14: http://code.google.com/p/google-gson/issues/detail?id=14
   */
  public void testNullObjectFieldsDeserialization() throws Exception {
    String json = "{\"bag\": null}";
    ClassWithObjects target = gson.fromJson(json, ClassWithObjects.class);
    assertNull(target.bag);
  }

  public void testEmptyCollectionInAnObjectDeserialization() throws Exception {
    String json = "{\"children\":[]}";
    ContainsReferenceToSelfType target = gson.fromJson(json, ContainsReferenceToSelfType.class);
    assertNotNull(target);
    assertTrue(target.children.isEmpty());
  }

  public void testPrimitiveArrayInAnObjectDeserialization() throws Exception {
    String json = "{\"longArray\":[0,1,2,3,4,5,6,7,8,9]}";
    PrimitiveArray target = gson.fromJson(json, PrimitiveArray.class);
    assertEquals(json, target.getExpectedJson());
  }

  /**
   * Created in response to Issue 14: http://code.google.com/p/google-gson/issues/detail?id=14
   */
  public void testNullPrimitiveFieldsDeserialization() throws Exception {
    String json = "{\"longValue\":null}";
    BagOfPrimitives target = gson.fromJson(json, BagOfPrimitives.class);
    assertEquals(BagOfPrimitives.DEFAULT_VALUE, target.longValue);
  }

  public void testEmptyCollectionInAnObjectSerialization() throws Exception {
    ContainsReferenceToSelfType target = new ContainsReferenceToSelfType();
    assertEquals("{\"children\":[]}", gson.toJson(target));
  }

  public void testCircularSerialization() throws Exception {
    ContainsReferenceToSelfType a = new ContainsReferenceToSelfType();
    ContainsReferenceToSelfType b = new ContainsReferenceToSelfType();
    a.children.add(b);
    b.children.add(a);
    try {
      gson.toJson(a);
      fail("Circular types should not get printed!");
    } catch (IllegalStateException expected) { }
  }

  public void testSelfReferenceSerialization() throws Exception {
    ClassOverridingEquals objA = new ClassOverridingEquals();
    objA.ref = objA;

    try {
      gson.toJson(objA);
      fail("Circular reference to self can not be serialized!");
    } catch (IllegalStateException expected) { }
  }

  public void testPrivateNoArgConstructorDeserialization() throws Exception {
    ClassWithPrivateNoArgsConstructor target =
      gson.fromJson("{\"a\":20}", ClassWithPrivateNoArgsConstructor.class);
    assertEquals(20, target.a);
  }

  public void testAnonymousLocalClassesSerialization() throws Exception {
    assertEquals("", gson.toJson(new ClassWithNoFields() {
      // empty anonymous class
    }));
  }

  public void testPrimitiveArrayFieldSerialization() {
    PrimitiveArray target = new PrimitiveArray(new long[] { 1L, 2L, 3L });
    assertEquals(target.getExpectedJson(), gson.toJson(target));
  }

  public static class ClassWithSubInterfacesOfCollection {
    private List<Integer> list;
    private Queue<Long> queue;
    private Set<Float> set;
    private SortedSet<Character> sortedSet;

    ClassWithSubInterfacesOfCollection() {
    }

    public ClassWithSubInterfacesOfCollection(List<Integer> list, Queue<Long> queue, Set<Float> set,
        SortedSet<Character> sortedSet) {
      this.list = list;
      this.queue = queue;
      this.set = set;
      this.sortedSet = sortedSet;
    }

    public String getExpectedJson() {
      StringBuilder sb = new StringBuilder();
      sb.append("{");
      sb.append("\"list\":");
      append(sb, list).append(",");
      sb.append("\"queue\":");
      append(sb, queue).append(",");
      sb.append("\"set\":");
      append(sb, set).append(",");
      sb.append("\"sortedSet\":");
      append(sb, sortedSet);
      sb.append("}");
      return sb.toString();
    }

    private StringBuilder append(StringBuilder sb, Collection<?> c) {
      sb.append("[");
      boolean first = true;
      for (Object o : c) {
        if (!first) {
          sb.append(",");
        } else {
          first = false;
        }
        if (o instanceof String || o instanceof Character) {
          sb.append('\"');
        }
        sb.append(o.toString());
        if (o instanceof String || o instanceof Character) {
          sb.append('\"');
        }
      }
      sb.append("]");
      return sb;
    }
  }

  private static class ContainsReferenceToSelfType {
    public Collection<ContainsReferenceToSelfType> children =
        new ArrayList<ContainsReferenceToSelfType>();
  }

  private static class SubTypeOfNested extends Nested {
    private final long value = 5;

    public SubTypeOfNested() {
      this(null, null);
    }

    public SubTypeOfNested(BagOfPrimitives primitive1, BagOfPrimitives primitive2) {
      super(primitive1, primitive2);
    }

    @Override
    public void appendFields(StringBuilder sb) {
      sb.append("\"value\":").append(value).append(",");
      super.appendFields(sb);
    }
  }

  private static class ArrayOfArrays {
    private final BagOfPrimitives[][] elements;
    public ArrayOfArrays() {
      elements = new BagOfPrimitives[3][2];
      for (int i = 0; i < elements.length; ++i) {
        BagOfPrimitives[] row = elements[i];
        for (int j = 0; j < row.length; ++j) {
          row[j] = new BagOfPrimitives(i+j, i*j, false, i+"_"+j);
        }
      }
    }
    public String getExpectedJson() {
      StringBuilder sb = new StringBuilder("{\"elements\":[");
      boolean first = true;
      for (BagOfPrimitives[] row : elements) {
        if (first) {
          first = false;
        } else {
          sb.append(",");
        }
        boolean firstOfRow = true;
        sb.append("[");
        for (BagOfPrimitives element : row) {
          if (firstOfRow) {
            firstOfRow = false;
          } else {
            sb.append(",");
          }
          sb.append(element.getExpectedJson());
        }
        sb.append("]");
      }
      sb.append("]}");
      return sb.toString();
    }
  }

  private static class ClassWithEnumFields {
    private final MyEnum value1 = MyEnum.VALUE1;
    private final MyEnum value2 = MyEnum.VALUE2;
    public String getExpectedJson() {
      return "{\"value1\":\"" + value1 + "\",\"value2\":\"" + value2 + "\"}";
    }
  }

  private static class ClassWithPrivateNoArgsConstructor {
    public int a;
    private ClassWithPrivateNoArgsConstructor() {
      a = 10;
    }
  }
}