// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd

package com.google.protobuf;

import static com.google.common.truth.Truth.assertThat;

import proto2_unittest.UnittestMset.RawMessageSet;
import proto2_unittest.UnittestMset.TestMessageSetExtension1;
import proto2_unittest.UnittestMset.TestMessageSetExtension2;
import proto2_unittest.UnittestProto;
import proto2_unittest.UnittestProto.TestAllExtensions;
import proto2_unittest.UnittestProto.TestAllTypes;
import proto2_unittest.UnittestProto.TestExtensionInsideTable;
import proto2_unittest.UnittestProto.TestFieldOrderings;
import proto2_unittest.UnittestProto.TestOneof2;
import proto2_unittest.UnittestProto.TestOneofBackwardsCompatible;
import proto2_unittest.UnittestProto.TestPackedExtensions;
import proto2_unittest.UnittestProto.TestPackedTypes;
import proto2_wireformat_unittest.UnittestMsetWireFormat.TestMessageSet;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.List;
import org.junit.After;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests related to parsing and serialization. */
@RunWith(JUnit4.class)
public class WireFormatTest {

  private static final int TYPE_ID_1 =
      TestMessageSetExtension1.getDescriptor().getExtensions().get(0).getNumber();
  private static final int TYPE_ID_2 =
      TestMessageSetExtension2.getDescriptor().getExtensions().get(0).getNumber();
  private static final int UNKNOWN_TYPE_ID = 1550055;

  @After
  public void tearDown() {
    // Whether to parse message sets eagerly is stored in a global static. Since some tests modify
    // the value, make sure to reset it between test runs.
    ExtensionRegistryLite.setEagerlyParseMessageSets(false);
  }

  @Test
  public void testSerialization() throws Exception {
    TestAllTypes message = TestUtil.getAllSet();

    ByteString rawBytes = message.toByteString();
    assertThat(rawBytes.size()).isEqualTo(message.getSerializedSize());

    TestAllTypes message2 = TestAllTypes.parseFrom(rawBytes);

    TestUtil.assertAllFieldsSet(message2);
  }

  @Test
  public void testSerializationPacked() throws Exception {
    TestPackedTypes message = TestUtil.getPackedSet();

    ByteString rawBytes = message.toByteString();
    assertThat(message.getSerializedSize()).isEqualTo(rawBytes.size());

    TestPackedTypes message2 = TestPackedTypes.parseFrom(rawBytes);

    TestUtil.assertPackedFieldsSet(message2);
  }

  @Test
  public void testSerializeExtensions() throws Exception {
    // TestAllTypes and TestAllExtensions should have compatible wire formats,
    // so if we serialize a TestAllExtensions then parse it as TestAllTypes
    // it should work.

    TestAllExtensions message = TestUtil.getAllExtensionsSet();
    ByteString rawBytes = message.toByteString();
    assertThat(message.getSerializedSize()).isEqualTo(rawBytes.size());

    TestAllTypes message2 = TestAllTypes.parseFrom(rawBytes);

    TestUtil.assertAllFieldsSet(message2);
  }

  @Test
  public void testSerializePackedExtensions() throws Exception {
    // TestPackedTypes and TestPackedExtensions should have compatible wire
    // formats; check that they serialize to the same string.
    TestPackedExtensions message = TestUtil.getPackedExtensionsSet();
    ByteString rawBytes = message.toByteString();

    TestPackedTypes message2 = TestUtil.getPackedSet();
    ByteString rawBytes2 = message2.toByteString();

    assertThat(rawBytes).isEqualTo(rawBytes2);
  }

  @Test
  public void testSerializationPackedWithoutGetSerializedSize() throws Exception {
    // Write directly to an OutputStream, without invoking getSerializedSize()
    // This used to be a bug where the size of a packed field was incorrect,
    // since getSerializedSize() was never invoked.
    TestPackedTypes message = TestUtil.getPackedSet();

    // Directly construct a CodedOutputStream around the actual OutputStream,
    // in case writeTo(OutputStream output) invokes getSerializedSize();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    CodedOutputStream codedOutput = CodedOutputStream.newInstance(outputStream);

    message.writeTo(codedOutput);

    codedOutput.flush();

    TestPackedTypes message2 = TestPackedTypes.parseFrom(outputStream.toByteArray());

    TestUtil.assertPackedFieldsSet(message2);
  }

  @Test
  public void testParseExtensions() throws Exception {
    // TestAllTypes and TestAllExtensions should have compatible wire formats,
    // so if we serialize a TestAllTypes then parse it as TestAllExtensions
    // it should work.

    TestAllTypes message = TestUtil.getAllSet();
    ByteString rawBytes = message.toByteString();

    ExtensionRegistryLite registry = TestUtil.getExtensionRegistry();

    TestAllExtensions message2 = TestAllExtensions.parseFrom(rawBytes, registry);

    TestUtil.assertAllExtensionsSet(message2);
  }

  @Test
  public void testParsePackedExtensions() throws Exception {
    // Ensure that packed extensions can be properly parsed.
    TestPackedExtensions message = TestUtil.getPackedExtensionsSet();
    ByteString rawBytes = message.toByteString();

    ExtensionRegistryLite registry = TestUtil.getExtensionRegistry();

    TestPackedExtensions message2 = TestPackedExtensions.parseFrom(rawBytes, registry);

    TestUtil.assertPackedExtensionsSet(message2);
  }

  @Test
  public void testSerializeDelimited() throws Exception {
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    TestUtil.getAllSet().writeDelimitedTo(output);
    output.write(12);
    TestUtil.getPackedSet().writeDelimitedTo(output);
    output.write(34);

    ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());

    TestUtil.assertAllFieldsSet(TestAllTypes.parseDelimitedFrom(input));
    assertThat(input.read()).isEqualTo(12);
    TestUtil.assertPackedFieldsSet(TestPackedTypes.parseDelimitedFrom(input));
    assertThat(input.read()).isEqualTo(34);
    assertThat(input.read()).isEqualTo(-1);

    // We're at EOF, so parsing again should return null.
    assertThat(TestAllTypes.parseDelimitedFrom(input)).isNull();
  }

  private void assertFieldsInOrder(ByteString data) throws Exception {
    CodedInputStream input = data.newCodedInput();
    int previousTag = 0;

    while (true) {
      int tag = input.readTag();
      if (tag == 0) {
        break;
      }

      assertThat(tag).isGreaterThan(previousTag);
      previousTag = tag;
      input.skipField(tag);
    }
  }

  @Test
  public void testInterleavedFieldsAndExtensions() throws Exception {
    // Tests that fields are written in order even when extension ranges
    // are interleaved with field numbers.
    ByteString data =
        TestFieldOrderings.newBuilder()
            .setMyInt(1)
            .setMyString("foo")
            .setMyFloat(1.0F)
            .setExtension(UnittestProto.myExtensionInt, 23)
            .setExtension(UnittestProto.myExtensionString, "bar")
            .build()
            .toByteString();
    assertFieldsInOrder(data);

    Descriptors.Descriptor descriptor = TestFieldOrderings.getDescriptor();
    ByteString dynamicData =
        DynamicMessage.newBuilder(TestFieldOrderings.getDescriptor())
            .setField(descriptor.findFieldByName("my_int"), 1L)
            .setField(descriptor.findFieldByName("my_string"), "foo")
            .setField(descriptor.findFieldByName("my_float"), 1.0F)
            .setField(UnittestProto.myExtensionInt.getDescriptor(), 23)
            .setField(UnittestProto.myExtensionString.getDescriptor(), "bar")
            .build()
            .toByteString();
    assertFieldsInOrder(dynamicData);
  }

  private ExtensionRegistry getTestFieldOrderingsRegistry() {
    ExtensionRegistry result = ExtensionRegistry.newInstance();
    result.add(UnittestProto.myExtensionInt);
    result.add(UnittestProto.myExtensionString);
    return result;
  }

  @Test
  public void testParseMultipleExtensionRanges() throws Exception {
    // Make sure we can parse a message that contains multiple extensions
    // ranges.
    TestFieldOrderings source =
        TestFieldOrderings.newBuilder()
            .setMyInt(1)
            .setMyString("foo")
            .setMyFloat(1.0F)
            .setExtension(UnittestProto.myExtensionInt, 23)
            .setExtension(UnittestProto.myExtensionString, "bar")
            .build();
    TestFieldOrderings dest =
        TestFieldOrderings.parseFrom(source.toByteString(), getTestFieldOrderingsRegistry());
    assertThat(source).isEqualTo(dest);
  }

  private static ExtensionRegistry getTestExtensionInsideTableRegistry() {
    ExtensionRegistry result = ExtensionRegistry.newInstance();
    result.add(UnittestProto.testExtensionInsideTableExtension);
    return result;
  }

  @Test
  public void testExtensionInsideTable() throws Exception {
    // Make sure the extension within the range of table is parsed correctly in experimental
    // runtime.
    TestExtensionInsideTable source =
        TestExtensionInsideTable.newBuilder()
            .setField1(1)
            .setExtension(UnittestProto.testExtensionInsideTableExtension, 23)
            .build();
    TestExtensionInsideTable dest =
        TestExtensionInsideTable.parseFrom(
            source.toByteString(), getTestExtensionInsideTableRegistry());
    assertThat(source).isEqualTo(dest);
  }

  @Test
  public void testParseMultipleExtensionRangesDynamic() throws Exception {
    // Same as above except with DynamicMessage.
    Descriptors.Descriptor descriptor = TestFieldOrderings.getDescriptor();
    DynamicMessage source =
        DynamicMessage.newBuilder(TestFieldOrderings.getDescriptor())
            .setField(descriptor.findFieldByName("my_int"), 1L)
            .setField(descriptor.findFieldByName("my_string"), "foo")
            .setField(descriptor.findFieldByName("my_float"), 1.0F)
            .setField(UnittestProto.myExtensionInt.getDescriptor(), 23)
            .setField(UnittestProto.myExtensionString.getDescriptor(), "bar")
            .build();
    DynamicMessage dest =
        DynamicMessage.parseFrom(
            descriptor, source.toByteString(), getTestFieldOrderingsRegistry());
    assertThat(source).isEqualTo(dest);
  }

  @Test
  public void testSerializeMessageSetEagerly() throws Exception {
    testSerializeMessageSetWithFlag(true);
  }

  @Test
  public void testSerializeMessageSetNotEagerly() throws Exception {
    testSerializeMessageSetWithFlag(false);
  }

  private void testSerializeMessageSetWithFlag(boolean eagerParsing) throws Exception {
    ExtensionRegistryLite.setEagerlyParseMessageSets(eagerParsing);
    // Set up a TestMessageSet with two known messages and an unknown one.
    TestMessageSet messageSet =
        TestMessageSet.newBuilder()
            .setExtension(
                TestMessageSetExtension1.messageSetExtension,
                TestMessageSetExtension1.newBuilder().setI(123).build())
            .setExtension(
                TestMessageSetExtension2.messageSetExtension,
                TestMessageSetExtension2.newBuilder().setStr("foo").build())
            .setUnknownFields(
                UnknownFieldSet.newBuilder()
                    .addField(
                        UNKNOWN_TYPE_ID,
                        UnknownFieldSet.Field.newBuilder()
                            .addLengthDelimited(ByteString.copyFromUtf8("bar"))
                            .build())
                    .build())
            .build();

    ByteString data = messageSet.toByteString();

    // Parse back using RawMessageSet and check the contents.
    RawMessageSet raw = RawMessageSet.parseFrom(data);

    assertThat(raw.getUnknownFields().asMap()).isEmpty();

    assertThat(raw.getItemCount()).isEqualTo(3);
    assertThat(raw.getItem(0).getTypeId()).isEqualTo(TYPE_ID_1);
    assertThat(raw.getItem(1).getTypeId()).isEqualTo(TYPE_ID_2);
    assertThat(raw.getItem(2).getTypeId()).isEqualTo(UNKNOWN_TYPE_ID);

    TestMessageSetExtension1 message1 =
        TestMessageSetExtension1.parseFrom(raw.getItem(0).getMessage());
    assertThat(message1.getI()).isEqualTo(123);

    TestMessageSetExtension2 message2 =
        TestMessageSetExtension2.parseFrom(raw.getItem(1).getMessage());
    assertThat(message2.getStr()).isEqualTo("foo");

    assertThat(raw.getItem(2).getMessage().toStringUtf8()).isEqualTo("bar");
  }

  @Test
  public void testParseMessageSetEagerly() throws Exception {
    testParseMessageSetWithFlag(true);
  }

  @Test
  public void testParseMessageSetNotEagerly() throws Exception {
    testParseMessageSetWithFlag(false);
  }

  private void testParseMessageSetWithFlag(boolean eagerParsing) throws Exception {
    ExtensionRegistryLite.setEagerlyParseMessageSets(eagerParsing);
    ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
    extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);
    extensionRegistry.add(TestMessageSetExtension2.messageSetExtension);

    // Set up a RawMessageSet with two known messages and an unknown one.
    RawMessageSet raw =
        RawMessageSet.newBuilder()
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(TYPE_ID_1)
                    .setMessage(
                        TestMessageSetExtension1.newBuilder().setI(123).build().toByteString())
                    .build())
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(TYPE_ID_2)
                    .setMessage(
                        TestMessageSetExtension2.newBuilder().setStr("foo").build().toByteString())
                    .build())
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(UNKNOWN_TYPE_ID)
                    .setMessage(ByteString.copyFromUtf8("bar"))
                    .build())
            .build();

    ByteString data = raw.toByteString();

    // Parse as a TestMessageSet and check the contents.
    TestMessageSet messageSet = TestMessageSet.parseFrom(data, extensionRegistry);

    assertThat(messageSet.getExtension(TestMessageSetExtension1.messageSetExtension).getI())
        .isEqualTo(123);
    assertThat(messageSet.getExtension(TestMessageSetExtension2.messageSetExtension).getStr())
        .isEqualTo("foo");

    // Check for unknown field with type LENGTH_DELIMITED,
    //   number UNKNOWN_TYPE_ID, and contents "bar".
    UnknownFieldSet unknownFields = messageSet.getUnknownFields();
    assertThat(unknownFields.asMap()).hasSize(1);
    assertThat(unknownFields.hasField(UNKNOWN_TYPE_ID)).isTrue();

    UnknownFieldSet.Field field = unknownFields.getField(UNKNOWN_TYPE_ID);
    assertThat(field.getLengthDelimitedList()).hasSize(1);
    assertThat(field.getLengthDelimitedList().get(0).toStringUtf8()).isEqualTo("bar");
  }

  @Test
  public void testParseMessageSetExtensionEagerly() throws Exception {
    testParseMessageSetExtensionWithFlag(true);
  }

  @Test
  public void testParseMessageSetExtensionNotEagerly() throws Exception {
    testParseMessageSetExtensionWithFlag(false);
  }

  private void testParseMessageSetExtensionWithFlag(boolean eagerParsing) throws Exception {
    ExtensionRegistryLite.setEagerlyParseMessageSets(eagerParsing);
    ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
    extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);

    // Set up a RawMessageSet with a known messages.
    RawMessageSet raw =
        RawMessageSet.newBuilder()
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(TYPE_ID_1)
                    .setMessage(
                        TestMessageSetExtension1.newBuilder().setI(123).build().toByteString())
                    .build())
            .build();

    ByteString data = raw.toByteString();

    // Parse as a TestMessageSet and check the contents.
    TestMessageSet messageSet = TestMessageSet.parseFrom(data, extensionRegistry);
    assertThat(messageSet.getExtension(TestMessageSetExtension1.messageSetExtension).getI())
        .isEqualTo(123);
  }

  @Test
  public void testMergeLazyMessageSetExtensionEagerly() throws Exception {
    testMergeLazyMessageSetExtensionWithFlag(true);
  }

  @Test
  public void testMergeLazyMessageSetExtensionNotEagerly() throws Exception {
    testMergeLazyMessageSetExtensionWithFlag(false);
  }

  private void testMergeLazyMessageSetExtensionWithFlag(boolean eagerParsing) throws Exception {
    ExtensionRegistryLite.setEagerlyParseMessageSets(eagerParsing);
    ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
    extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);

    // Set up a RawMessageSet with a known messages.
    RawMessageSet raw =
        RawMessageSet.newBuilder()
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(TYPE_ID_1)
                    .setMessage(
                        TestMessageSetExtension1.newBuilder().setI(123).build().toByteString())
                    .build())
            .build();

    ByteString data = raw.toByteString();

    // Parse as a TestMessageSet and store value into lazy field
    TestMessageSet messageSet = TestMessageSet.parseFrom(data, extensionRegistry);
    // Merge lazy field check the contents.
    messageSet = messageSet.toBuilder().mergeFrom(data, extensionRegistry).build();
    assertThat(messageSet.getExtension(TestMessageSetExtension1.messageSetExtension).getI())
        .isEqualTo(123);
  }

  @Test
  public void testMergeMessageSetExtensionEagerly() throws Exception {
    testMergeMessageSetExtensionWithFlag(true);
  }

  @Test
  public void testMergeMessageSetExtensionNotEagerly() throws Exception {
    testMergeMessageSetExtensionWithFlag(false);
  }

  private void testMergeMessageSetExtensionWithFlag(boolean eagerParsing) throws Exception {
    ExtensionRegistryLite.setEagerlyParseMessageSets(eagerParsing);
    ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
    extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);

    // Set up a RawMessageSet with a known messages.
    RawMessageSet raw =
        RawMessageSet.newBuilder()
            .addItem(
                RawMessageSet.Item.newBuilder()
                    .setTypeId(TYPE_ID_1)
                    .setMessage(
                        TestMessageSetExtension1.newBuilder().setI(123).build().toByteString())
                    .build())
            .build();

    // Serialize RawMessageSet unnormally (message value before type id)
    ByteString.CodedBuilder out = ByteString.newCodedBuilder(raw.getSerializedSize());
    CodedOutputStream output = out.getCodedOutput();
    List<RawMessageSet.Item> items = raw.getItemList();
    for (int i = 0; i < items.size(); i++) {
      RawMessageSet.Item item = items.get(i);
      output.writeTag(1, WireFormat.WIRETYPE_START_GROUP);
      output.writeBytes(3, item.getMessage());
      output.writeInt32(2, item.getTypeId());
      output.writeTag(1, WireFormat.WIRETYPE_END_GROUP);
    }
    ByteString data = out.build();

    // Merge bytes into TestMessageSet and check the contents.
    TestMessageSet messageSet =
        TestMessageSet.newBuilder().mergeFrom(data, extensionRegistry).build();
    assertThat(messageSet.getExtension(TestMessageSetExtension1.messageSetExtension).getI())
        .isEqualTo(123);
  }

  // ================================================================
  // oneof
  @Test
  public void testOneofWireFormat() throws Exception {
    TestOneof2.Builder builder = TestOneof2.newBuilder();
    TestUtil.setOneof(builder);
    TestOneof2 message = builder.build();
    ByteString rawBytes = message.toByteString();

    assertThat(message.getSerializedSize()).isEqualTo(rawBytes.size());

    TestOneof2 message2 = TestOneof2.parseFrom(rawBytes);
    TestUtil.assertOneofSet(message2);
  }

  @Test
  public void testOneofOnlyLastSet() throws Exception {
    TestOneofBackwardsCompatible source =
        TestOneofBackwardsCompatible.newBuilder().setFooInt(100).setFooString("101").build();

    ByteString rawBytes = source.toByteString();
    TestOneof2 message = TestOneof2.parseFrom(rawBytes);
    assertThat(message.hasFooInt()).isFalse();
    assertThat(message.hasFooString()).isTrue();
  }
}
