// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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package com.google.protobuf;

import protobuf_unittest.UnittestProto.TestAllTypes;
import protobuf_unittest.UnittestProto.TestAllTypesOrBuilder;

import junit.framework.TestCase;

import java.util.Collections;
import java.util.List;

/**
 * Tests for {@link RepeatedFieldBuilder}. This tests basic functionality.
 * More extensive testing is provided via other tests that exercise the
 * builder.
 *
 * @author jonp@google.com (Jon Perlow)
 */
public class RepeatedFieldBuilderTest extends TestCase {

  public void testBasicUse() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder = newRepeatedFieldBuilder(mockParent);
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(1).build());
    assertEquals(0, builder.getMessage(0).getOptionalInt32());
    assertEquals(1, builder.getMessage(1).getOptionalInt32());

    List<TestAllTypes> list = builder.build();
    assertEquals(2, list.size());
    assertEquals(0, list.get(0).getOptionalInt32());
    assertEquals(1, list.get(1).getOptionalInt32());
    assertIsUnmodifiable(list);

    // Make sure it doesn't change.
    List<TestAllTypes> list2 = builder.build();
    assertSame(list, list2);
    assertEquals(0, mockParent.getInvalidationCount());
  }

  public void testGoingBackAndForth() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder = newRepeatedFieldBuilder(mockParent);
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(1).build());
    assertEquals(0, builder.getMessage(0).getOptionalInt32());
    assertEquals(1, builder.getMessage(1).getOptionalInt32());

    // Convert to list
    List<TestAllTypes> list = builder.build();
    assertEquals(2, list.size());
    assertEquals(0, list.get(0).getOptionalInt32());
    assertEquals(1, list.get(1).getOptionalInt32());
    assertIsUnmodifiable(list);

    // Update 0th item
    assertEquals(0, mockParent.getInvalidationCount());
    builder.getBuilder(0).setOptionalString("foo");
    assertEquals(1, mockParent.getInvalidationCount());
    list = builder.build();
    assertEquals(2, list.size());
    assertEquals(0, list.get(0).getOptionalInt32());
      assertEquals("foo", list.get(0).getOptionalString());
    assertEquals(1, list.get(1).getOptionalInt32());
    assertIsUnmodifiable(list);
    assertEquals(1, mockParent.getInvalidationCount());
  }

  public void testVariousMethods() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder = newRepeatedFieldBuilder(mockParent);
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(1).build());
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(2).build());
    builder.addBuilder(0, TestAllTypes.getDefaultInstance())
        .setOptionalInt32(0);
    builder.addBuilder(TestAllTypes.getDefaultInstance()).setOptionalInt32(3);

    assertEquals(0, builder.getMessage(0).getOptionalInt32());
    assertEquals(1, builder.getMessage(1).getOptionalInt32());
    assertEquals(2, builder.getMessage(2).getOptionalInt32());
    assertEquals(3, builder.getMessage(3).getOptionalInt32());

    assertEquals(0, mockParent.getInvalidationCount());
    List<TestAllTypes> messages = builder.build();
    assertEquals(4, messages.size());
    assertSame(messages, builder.build()); // expect same list

    // Remove a message.
    builder.remove(2);
    assertEquals(1, mockParent.getInvalidationCount());
    assertEquals(3, builder.getCount());
    assertEquals(0, builder.getMessage(0).getOptionalInt32());
    assertEquals(1, builder.getMessage(1).getOptionalInt32());
    assertEquals(3, builder.getMessage(2).getOptionalInt32());

    // Remove a builder.
    builder.remove(0);
    assertEquals(1, mockParent.getInvalidationCount());
    assertEquals(2, builder.getCount());
    assertEquals(1, builder.getMessage(0).getOptionalInt32());
    assertEquals(3, builder.getMessage(1).getOptionalInt32());

    // Test clear.
    builder.clear();
    assertEquals(1, mockParent.getInvalidationCount());
    assertEquals(0, builder.getCount());
    assertTrue(builder.isEmpty());
  }

  public void testLists() {
    TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
    RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder> builder = newRepeatedFieldBuilder(mockParent);
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(1).build());
    builder.addMessage(0,
        TestAllTypes.newBuilder().setOptionalInt32(0).build());
    assertEquals(0, builder.getMessage(0).getOptionalInt32());
    assertEquals(1, builder.getMessage(1).getOptionalInt32());

    // Use list of builders.
    List<TestAllTypes.Builder> builders = builder.getBuilderList();
    assertEquals(0, builders.get(0).getOptionalInt32());
    assertEquals(1, builders.get(1).getOptionalInt32());
    builders.get(0).setOptionalInt32(10);
    builders.get(1).setOptionalInt32(11);

    // Use list of protos
    List<TestAllTypes> protos = builder.getMessageList();
    assertEquals(10, protos.get(0).getOptionalInt32());
    assertEquals(11, protos.get(1).getOptionalInt32());

    // Add an item to the builders and verify it's updated in both
    builder.addMessage(TestAllTypes.newBuilder().setOptionalInt32(12).build());
    assertEquals(3, builders.size());
    assertEquals(3, protos.size());
  }

  private void assertIsUnmodifiable(List<?> list) {
    if (list == Collections.emptyList()) {
      // OKAY -- Need to check this b/c EmptyList allows you to call clear.
    } else {
      try {
        list.clear();
        fail("List wasn't immutable");
      } catch (UnsupportedOperationException e) {
        // good
      }
    }
  }

  private RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
      TestAllTypesOrBuilder>
      newRepeatedFieldBuilder(GeneratedMessage.BuilderParent parent) {
    return new RepeatedFieldBuilder<TestAllTypes, TestAllTypes.Builder,
        TestAllTypesOrBuilder>(Collections.<TestAllTypes>emptyList(), false,
        parent, false);
  }
}