// 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.

#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>

#include <gtest/gtest.h>

#include "kudu/util/inline_slice.h"
#include "kudu/util/memory/arena.h"
#include "kudu/util/slice.h"

using std::unique_ptr;

namespace kudu {

template<size_t N>
static void TestRoundTrip(InlineSlice<N> *slice,
                          Arena *arena,
                          size_t test_size) {
  unique_ptr<uint8_t[]> buf(new uint8_t[test_size]);
  for (int i = 0; i < test_size; i++) {
    buf[i] = i & 0xff;
  }

  Slice test_input(buf.get(), test_size);

  slice->set(test_input, arena);
  Slice ret = slice->as_slice();
  ASSERT_TRUE(ret == test_input)
    << "test_size  =" << test_size << "\n"
    << "ret        = " << ret.ToDebugString() << "\n"
    << "test_input = " << test_input.ToDebugString();

  // If the data is small enough to fit inline, then
  // the returned slice should point directly into the
  // InlineSlice object.
  if (test_size < N) {
    ASSERT_EQ(reinterpret_cast<const uint8_t *>(slice) + 1,
              ret.data());
  }
}

// Sweep a variety of inputs for a given size of inline
// data
template<size_t N>
static void DoTest() {
  Arena arena(1024);

  // Test a range of inputs both growing and shrinking
  InlineSlice<N> my_slice;
  ASSERT_EQ(N, sizeof(my_slice));

  for (size_t to_test = 0; to_test < 1000; to_test++) {
    TestRoundTrip(&my_slice, &arena, to_test);
  }
  for (size_t to_test = 1000; to_test > 0; to_test--) {
    TestRoundTrip(&my_slice, &arena, to_test);
  }
}

TEST(TestInlineSlice, Test8ByteInline) {
  DoTest<8>();
}

TEST(TestInlineSlice, Test12ByteInline) {
  DoTest<12>();
}

TEST(TestInlineSlice, Test16ByteInline) {
  DoTest<16>();
}

} // namespace kudu