/*
 * 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 org.apache.tuweni.bytes;

import static org.apache.tuweni.bytes.Bytes.fromHexString;
import static org.apache.tuweni.bytes.Bytes.wrap;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;

import java.util.Arrays;
import java.util.stream.Stream;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

class ConcatenatedBytesTest {

  @ParameterizedTest
  @MethodSource("concatenatedWrapProvider")
  void concatenatedWrap(Object arr1, Object arr2) {
    byte[] first = (byte[]) arr1;
    byte[] second = (byte[]) arr2;
    byte[] res = wrap(wrap(first), wrap(second)).toArray();
    assertArrayEquals(Arrays.copyOfRange(res, 0, first.length), first);
    assertArrayEquals(Arrays.copyOfRange(res, first.length, res.length), second);
  }

  @SuppressWarnings("UnusedMethod")
  private static Stream<Arguments> concatenatedWrapProvider() {
    return Stream
        .of(
            Arguments.of(new byte[] {}, new byte[] {}),
            Arguments.of(new byte[] {}, new byte[] {1, 2, 3}),
            Arguments.of(new byte[] {1, 2, 3}, new byte[] {}),
            Arguments.of(new byte[] {1, 2, 3}, new byte[] {4, 5}));
  }

  @Test
  void testConcatenatedWrapReflectsUpdates() {
    byte[] first = new byte[] {1, 2, 3};
    byte[] second = new byte[] {4, 5};
    byte[] expected1 = new byte[] {1, 2, 3, 4, 5};
    Bytes res = wrap(wrap(first), wrap(second));
    assertArrayEquals(res.toArray(), expected1);

    first[1] = 42;
    second[0] = 42;
    byte[] expected2 = new byte[] {1, 42, 3, 42, 5};
    assertArrayEquals(res.toArray(), expected2);
  }

  @Test
  void shouldReadConcatenatedValue() {
    Bytes bytes = wrap(fromHexString("0x01234567"), fromHexString("0x89ABCDEF"));
    assertEquals(8, bytes.size());
    assertEquals("0x0123456789abcdef", bytes.toHexString());
  }

  @Test
  void shouldSliceConcatenatedValue() {
    Bytes bytes = wrap(
        fromHexString("0x01234567"),
        fromHexString("0x89ABCDEF"),
        fromHexString("0x01234567"),
        fromHexString("0x89ABCDEF"));
    assertEquals("0x", bytes.slice(4, 0).toHexString());
    assertEquals("0x0123456789abcdef0123456789abcdef", bytes.slice(0, 16).toHexString());
    assertEquals("0x01234567", bytes.slice(0, 4).toHexString());
    assertEquals("0x0123", bytes.slice(0, 2).toHexString());
    assertEquals("0x6789", bytes.slice(3, 2).toHexString());
    assertEquals("0x89abcdef", bytes.slice(4, 4).toHexString());
    assertEquals("0xabcd", bytes.slice(5, 2).toHexString());
    assertEquals("0xef012345", bytes.slice(7, 4).toHexString());
    assertEquals("0x01234567", bytes.slice(8, 4).toHexString());
    assertEquals("0x456789abcdef", bytes.slice(10, 6).toHexString());
    assertEquals("0x89abcdef", bytes.slice(12, 4).toHexString());
  }

  @Test
  void shouldReadDeepConcatenatedValue() {
    Bytes bytes = wrap(
        wrap(fromHexString("0x01234567"), fromHexString("0x89ABCDEF")),
        wrap(fromHexString("0x01234567"), fromHexString("0x89ABCDEF")),
        fromHexString("0x01234567"),
        fromHexString("0x89ABCDEF"));
    assertEquals(24, bytes.size());
    assertEquals("0x0123456789abcdef0123456789abcdef0123456789abcdef", bytes.toHexString());
  }

  @Test
  void testCopy() {
    Bytes bytes = wrap(fromHexString("0x01234567"), fromHexString("0x89ABCDEF"));
    assertEquals(bytes, bytes.copy());
    assertEquals(bytes, bytes.mutableCopy());
  }

  @Test
  void testCopyTo() {
    Bytes bytes = wrap(fromHexString("0x0123"), fromHexString("0x4567"));
    MutableBytes dest = MutableBytes.create(32);
    bytes.copyTo(dest, 10);
    assertEquals(Bytes.fromHexString("0x0000000000000000000001234567000000000000000000000000000000000000"), dest);
  }

  @Test
  void testHashcodeUpdates() {
    MutableBytes dest = MutableBytes.create(32);
    Bytes bytes = wrap(dest, fromHexString("0x4567"));
    int hashCode = bytes.hashCode();
    dest.set(1, (byte) 123);
    assertNotEquals(hashCode, bytes.hashCode());
  }
}
