// 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 proto2_test_check_utf8.TestCheckUtf8.BytesWrapper;
import proto2_test_check_utf8.TestCheckUtf8.StringWrapper;
import proto2_test_check_utf8_size.TestCheckUtf8Size.BytesWrapperSize;
import proto2_test_check_utf8_size.TestCheckUtf8Size.StringWrapperSize;
import java.io.ByteArrayInputStream;
import junit.framework.TestCase;

/**
 * Test that protos generated with file option java_string_check_utf8 do in
 * fact perform appropriate UTF-8 checks.
 *
 * @author jbaum@google.com (Jacob Butcher)
 */
public class CheckUtf8Test extends TestCase {

  private static final String UTF8_BYTE_STRING_TEXT = "some text";
  private static final ByteString UTF8_BYTE_STRING =
      ByteString.copyFromUtf8(UTF8_BYTE_STRING_TEXT);
  private static final ByteString NON_UTF8_BYTE_STRING =
      ByteString.copyFrom(new byte[]{(byte) 0x80}); // A lone continuation byte.

  public void testBuildRequiredStringWithGoodUtf8() throws Exception {
    assertEquals(UTF8_BYTE_STRING_TEXT,
                 StringWrapper.newBuilder().setReqBytes(UTF8_BYTE_STRING).getReq());
  }

  public void testParseRequiredStringWithGoodUtf8() throws Exception {
    ByteString serialized =
        BytesWrapper.newBuilder().setReq(UTF8_BYTE_STRING).build().toByteString();
    assertEquals(UTF8_BYTE_STRING_TEXT, StringWrapper.parser().parseFrom(serialized).getReq());
  }

  public void testBuildRequiredStringWithBadUtf8() throws Exception {
    try {
      StringWrapper.newBuilder().setReqBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testBuildOptionalStringWithBadUtf8() throws Exception {
    try {
      StringWrapper.newBuilder().setOptBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testBuildRepeatedStringWithBadUtf8() throws Exception {
    try {
      StringWrapper.newBuilder().addRepBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testParseRequiredStringWithBadUtf8() throws Exception {
    byte[] serialized =
        BytesWrapper.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
    assertParseBadUtf8(StringWrapper.getDefaultInstance(), serialized);
  }

  public void testBuildRequiredStringWithBadUtf8Size() throws Exception {
    try {
      StringWrapperSize.newBuilder().setReqBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testBuildOptionalStringWithBadUtf8Size() throws Exception {
    try {
      StringWrapperSize.newBuilder().setOptBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testBuildRepeatedStringWithBadUtf8Size() throws Exception {
    try {
      StringWrapperSize.newBuilder().addRepBytes(NON_UTF8_BYTE_STRING);
      fail("Expected IllegalArgumentException for non UTF-8 byte string.");
    } catch (IllegalArgumentException exception) {
      assertEquals("Byte string is not UTF-8.", exception.getMessage());
    }
  }

  public void testParseRequiredStringWithBadUtf8Size() throws Exception {
    byte[] serialized =
        BytesWrapperSize.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
    assertParseBadUtf8(StringWrapperSize.getDefaultInstance(), serialized);
  }

  private void assertParseBadUtf8(MessageLite defaultInstance, byte[] data) throws Exception {
    // Check combinations of (parser vs. builder) x (byte[] vs. InputStream)
    try {
      defaultInstance.getParserForType().parseFrom(data);
      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
    } catch (InvalidProtocolBufferException exception) {
      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
    }
    try {
      defaultInstance.newBuilderForType().mergeFrom(data);
      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
    } catch (InvalidProtocolBufferException exception) {
      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
    }
    try {
      defaultInstance.getParserForType().parseFrom(new ByteArrayInputStream(data));
      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
    } catch (InvalidProtocolBufferException exception) {
      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
    }
    try {
      defaultInstance.newBuilderForType().mergeFrom(new ByteArrayInputStream(data));
      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
    } catch (InvalidProtocolBufferException exception) {
      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
    }
  }
}