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   * 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 com.datastax.oss.driver.internal.core.type.codec;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  
  import com.datastax.oss.driver.api.core.ProtocolVersion;
  import com.datastax.oss.driver.api.core.data.CqlVector;
  import com.datastax.oss.driver.api.core.type.DataType;
  import com.datastax.oss.driver.api.core.type.DataTypes;
  import com.datastax.oss.driver.api.core.type.codec.TypeCodec;
  import com.datastax.oss.driver.api.core.type.codec.TypeCodecs;
  import com.datastax.oss.driver.api.core.type.codec.registry.CodecRegistry;
  import com.datastax.oss.driver.internal.core.type.DefaultVectorType;
  import com.datastax.oss.protocol.internal.util.Bytes;
  import com.tngtech.java.junit.dataprovider.DataProvider;
  import com.tngtech.java.junit.dataprovider.DataProviderRunner;
  import com.tngtech.java.junit.dataprovider.UseDataProvider;
  import java.nio.ByteBuffer;
  import java.time.LocalTime;
  import java.util.HashMap;
  import org.apache.commons.lang3.ArrayUtils;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  @RunWith(DataProviderRunner.class)
  public class VectorCodecTest {
  
    @DataProvider
    public static Object[] dataProvider() {
      HashMap<Integer, String> map1 = new HashMap<>();
      map1.put(1, "a");
      HashMap<Integer, String> map2 = new HashMap<>();
      map2.put(2, "b");
      return new TestDataContainer[] {
        new TestDataContainer(
            DataTypes.FLOAT,
            new Float[] {1.0f, 2.5f},
            "[1.0, 2.5]",
            Bytes.fromHexString("0x3f80000040200000")),
        new TestDataContainer(
            DataTypes.ASCII,
            new String[] {"ab", "cde"},
            "['ab', 'cde']",
            Bytes.fromHexString("0x02616203636465")),
        new TestDataContainer(
            DataTypes.BIGINT,
            new Long[] {1L, 2L},
            "[1, 2]",
            Bytes.fromHexString("0x00000000000000010000000000000002")),
        new TestDataContainer(
            DataTypes.BLOB,
            new ByteBuffer[] {Bytes.fromHexString("0xCAFE"), Bytes.fromHexString("0xABCD")},
            "[0xcafe, 0xabcd]",
            Bytes.fromHexString("0x02cafe02abcd")),
        new TestDataContainer(
            DataTypes.BOOLEAN,
            new Boolean[] {true, false},
            "[true, false]",
            Bytes.fromHexString("0x0100")),
        new TestDataContainer(
            DataTypes.TIME,
            new LocalTime[] {LocalTime.ofNanoOfDay(1), LocalTime.ofNanoOfDay(2)},
            "['00:00:00.000000001', '00:00:00.000000002']",
            Bytes.fromHexString("0x080000000000000001080000000000000002")),
        new TestDataContainer(
            DataTypes.mapOf(DataTypes.INT, DataTypes.ASCII),
            new HashMap[] {map1, map2},
            "[{1:'a'}, {2:'b'}]",
            Bytes.fromHexString(
                "0x110000000100000004000000010000000161110000000100000004000000020000000162")),
        new TestDataContainer(
            DataTypes.vectorOf(DataTypes.INT, 1),
            new CqlVector[] {CqlVector.newInstance(1), CqlVector.newInstance(2)},
            "[[1], [2]]",
            Bytes.fromHexString("0x0000000100000002")),
        new TestDataContainer(
            DataTypes.vectorOf(DataTypes.TEXT, 1),
            new CqlVector[] {CqlVector.newInstance("ab"), CqlVector.newInstance("cdef")},
            "[['ab'], ['cdef']]",
            Bytes.fromHexString("0x03026162050463646566")),
        new TestDataContainer(
            DataTypes.vectorOf(DataTypes.vectorOf(DataTypes.FLOAT, 2), 1),
            new CqlVector[] {
              CqlVector.newInstance(CqlVector.newInstance(1.0f, 2.5f)),
              CqlVector.newInstance(CqlVector.newInstance(3.0f, 4.5f))
            },
            "[[[1.0, 2.5]], [[3.0, 4.5]]]",
            Bytes.fromHexString("0x3f800000402000004040000040900000"))
      };
    }
  
    @UseDataProvider("dataProvider")
    @Test
    public void should_encode(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      CqlVector<Object> vector = CqlVector.newInstance(testData.getValues());
      assertThat(codec.encode(vector, ProtocolVersion.DEFAULT)).isEqualTo(testData.getBytes());
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_throw_on_encode_with_too_few_elements(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThatThrownBy(
              () ->
                  codec.encode(
                      CqlVector.newInstance(testData.getValues()[0]), ProtocolVersion.DEFAULT))
          .isInstanceOf(IllegalArgumentException.class);
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_throw_on_encode_with_too_many_elements(TestDataContainer testData) {
      Object[] doubled = ArrayUtils.addAll(testData.getValues(), testData.getValues());
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThatThrownBy(() -> codec.encode(CqlVector.newInstance(doubled), ProtocolVersion.DEFAULT))
          .isInstanceOf(IllegalArgumentException.class);
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_decode(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.decode(testData.getBytes(), ProtocolVersion.DEFAULT))
          .isEqualTo(CqlVector.newInstance(testData.getValues()));
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_throw_on_decode_if_too_few_bytes(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      int lastIndex = testData.getBytes().remaining() - 1;
      assertThatThrownBy(
              () ->
                  codec.decode(
                      (ByteBuffer) testData.getBytes().duplicate().limit(lastIndex),
                      ProtocolVersion.DEFAULT))
          .isInstanceOf(IllegalArgumentException.class);
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_throw_on_decode_if_too_many_bytes(TestDataContainer testData) {
      ByteBuffer doubled = ByteBuffer.allocate(testData.getBytes().remaining() * 2);
      doubled.put(testData.getBytes().duplicate()).put(testData.getBytes().duplicate()).flip();
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThatThrownBy(() -> codec.decode(doubled, ProtocolVersion.DEFAULT))
          .isInstanceOf(IllegalArgumentException.class);
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_format(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      CqlVector<Object> vector = CqlVector.newInstance(testData.getValues());
      assertThat(codec.format(vector)).isEqualTo(testData.getFormatted());
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_parse(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.parse(testData.getFormatted()))
          .isEqualTo(CqlVector.newInstance(testData.getValues()));
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_accept_data_type(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.accepts(new DefaultVectorType(testData.getDataType(), 2))).isTrue();
      assertThat(codec.accepts(new DefaultVectorType(DataTypes.custom("non-existent"), 2))).isFalse();
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_accept_vector_type_correct_dimension_only(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.accepts(new DefaultVectorType(testData.getDataType(), 0))).isFalse();
      assertThat(codec.accepts(new DefaultVectorType(testData.getDataType(), 1))).isFalse();
      assertThat(codec.accepts(new DefaultVectorType(testData.getDataType(), 3))).isFalse();
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_accept_generic_type(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.accepts(codec.getJavaType())).isTrue();
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_accept_raw_type(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      assertThat(codec.accepts(CqlVector.class)).isTrue();
      assertThat(codec.accepts(Integer.class)).isFalse();
    }
  
    @Test
    @UseDataProvider("dataProvider")
    public void should_accept_object(TestDataContainer testData) {
      TypeCodec<CqlVector<Object>> codec = getCodec(testData.getDataType());
      CqlVector<?> vector = CqlVector.newInstance(testData.getValues());
      assertThat(codec.accepts(vector)).isTrue();
      assertThat(codec.accepts(Integer.MIN_VALUE)).isFalse();
    }
  
    @Test
    public void should_handle_null_and_empty() {
      TypeCodec<CqlVector<Object>> codec = getCodec(DataTypes.FLOAT);
      assertThat(codec.encode(null, ProtocolVersion.DEFAULT)).isNull();
      assertThat(codec.decode(Bytes.fromHexString("0x"), ProtocolVersion.DEFAULT)).isNull();
      assertThat(codec.format(null)).isEqualTo("NULL");
      assertThat(codec.parse("NULL")).isNull();
      assertThat(codec.parse("null")).isNull();
      assertThat(codec.parse("")).isNull();
      assertThat(codec.parse(null)).isNull();
      assertThatThrownBy(() -> codec.encode(CqlVector.newInstance(), ProtocolVersion.DEFAULT))
          .isInstanceOf(IllegalArgumentException.class);
    }
  
    private static TypeCodec<CqlVector<Object>> getCodec(DataType dataType) {
      return TypeCodecs.vectorOf(
          DataTypes.vectorOf(dataType, 2), CodecRegistry.DEFAULT.codecFor(dataType));
    }
  
    private static class TestDataContainer {
      private final DataType dataType;
      private final Object[] values;
      private final String formatted;
      private final ByteBuffer bytes;
  
      public TestDataContainer(
          DataType dataType, Object[] values, String formatted, ByteBuffer bytes) {
        this.dataType = dataType;
        this.values = values;
        this.formatted = formatted;
        this.bytes = bytes;
      }
  
      public DataType getDataType() {
        return dataType;
      }
  
      public Object[] getValues() {
        return values;
      }
  
      public String getFormatted() {
        return formatted;
      }
  
      public ByteBuffer getBytes() {
        return bytes;
      }
    }
  }
  