// 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 <string>

#include "runtime/mem-pool.h"
#include "runtime/mem-tracker.h"
#include "runtime/string-buffer.h"
#include "testutil/gtest-util.h"

#include "common/names.h"

namespace impala {

void ValidateString(const string& std_str, const StringBuffer& str) {
  EXPECT_EQ(std_str.empty(), str.IsEmpty());
  EXPECT_EQ(static_cast<int64_t>(std_str.size()), str.len());
  if (std_str.size() > 0) {
    EXPECT_EQ(strncmp(std_str.c_str(), str.buffer(), std_str.size()), 0);
  }
}

TEST(StringBufferTest, Basic) {
  MemTracker tracker;
  MemPool pool(&tracker);
  StringBuffer str(&pool);
  string std_str;

  // Empty string
  ValidateString(std_str, str);

  // Clear empty string
  std_str.clear();
  str.Clear();
  ValidateString(std_str, str);

  // Append to empty
  std_str.append("Hello");
  ASSERT_OK(str.Append("Hello", strlen("Hello")));
  ValidateString(std_str, str);

  // Append some more
  std_str.append("World");
  ASSERT_OK(str.Append("World", strlen("World")));
  ValidateString(std_str, str);

  // Clear
  std_str.clear();
  str.Clear();
  ValidateString(std_str, str);

  // Underlying buffer size should be the length of the max string during the test.
  EXPECT_EQ(str.buffer_size(), strlen("HelloWorld"));

  pool.FreeAll();
}

TEST(StringBufferTest, AppendBoundary) {
  // Test StringBuffer::Append() works beyond 1GB.
  MemTracker tracker;
  MemPool pool(&tracker);
  StringBuffer str(&pool);
  string std_str;

  const int64_t chunk_size = 8 * 1024 * 1024;
  const int64_t max_data_size = 1LL << 32;
  std_str.resize(chunk_size, 'a');
  int64_t data_size = 0;
  while (data_size + chunk_size <= max_data_size) {
    ASSERT_OK(str.Append(std_str.c_str(), chunk_size));
    data_size += chunk_size;
  }
  EXPECT_EQ(str.buffer_size(), data_size);
  std_str.resize(max_data_size, 'a');
  ValidateString(std_str, str);

  pool.FreeAll();
}

}