//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under the BSD-style license found in the
//  LICENSE file in the root directory of this source tree. An additional grant
//  of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <limits>
#include <string>

#include "db/db_test_util.h"
#include "port/stack_trace.h"
#include "util/sync_point.h"

namespace rocksdb {

class DBOptionsTest : public DBTestBase {
 public:
  DBOptionsTest() : DBTestBase("/db_options_test") {}
};

// RocksDB lite don't support dynamic options.
#ifndef ROCKSDB_LITE

TEST_F(DBOptionsTest, EnableAutoCompactionAndTriggerStall) {
  const std::string kValue(1024, 'v');
  for (int method_type = 0; method_type < 2; method_type++) {
    for (int option_type = 0; option_type < 4; option_type++) {
      Options options;
      options.create_if_missing = true;
      options.disable_auto_compactions = true;
      options.write_buffer_size = 1024 * 1024;
      options.compression = CompressionType::kNoCompression;
      options.level0_file_num_compaction_trigger = 1;
      options.level0_stop_writes_trigger = std::numeric_limits<int>::max();
      options.level0_slowdown_writes_trigger = std::numeric_limits<int>::max();
      options.hard_pending_compaction_bytes_limit =
          std::numeric_limits<uint64_t>::max();
      options.soft_pending_compaction_bytes_limit =
          std::numeric_limits<uint64_t>::max();

      DestroyAndReopen(options);
      for (int i = 0; i < 1024 * 2; i++) {
        Put(Key(i), kValue);
      }
      dbfull()->TEST_WaitForFlushMemTable();
      ASSERT_EQ(2, NumTableFilesAtLevel(0));
      uint64_t l0_size = SizeAtLevel(0);

      switch (option_type) {
        case 0:
          // test with level0_stop_writes_trigger
          options.level0_stop_writes_trigger = 2;
          options.level0_slowdown_writes_trigger = 2;
          break;
        case 1:
          options.level0_slowdown_writes_trigger = 2;
          break;
        case 2:
          options.hard_pending_compaction_bytes_limit = l0_size;
          options.soft_pending_compaction_bytes_limit = l0_size;
          break;
        case 3:
          options.soft_pending_compaction_bytes_limit = l0_size;
          break;
      }
      Reopen(options);
      dbfull()->TEST_WaitForCompact();
      ASSERT_FALSE(dbfull()->TEST_write_controler().IsStopped());
      ASSERT_FALSE(dbfull()->TEST_write_controler().NeedsDelay());

      SyncPoint::GetInstance()->LoadDependency(
          {{"DBOptionsTest::EnableAutoCompactionAndTriggerStall:1",
            "BackgroundCallCompaction:0"},
           {"DBImpl::BackgroundCompaction():BeforePickCompaction",
            "DBOptionsTest::EnableAutoCompactionAndTriggerStall:2"},
           {"DBOptionsTest::EnableAutoCompactionAndTriggerStall:3",
            "DBImpl::BackgroundCompaction():AfterPickCompaction"}});
      // Block background compaction.
      SyncPoint::GetInstance()->EnableProcessing();

      switch (method_type) {
        case 0:
          ASSERT_OK(
              dbfull()->SetOptions({{"disable_auto_compactions", "false"}}));
          break;
        case 1:
          ASSERT_OK(dbfull()->EnableAutoCompaction(
              {dbfull()->DefaultColumnFamily()}));
          break;
      }
      TEST_SYNC_POINT("DBOptionsTest::EnableAutoCompactionAndTriggerStall:1");
      // Wait for stall condition recalculate.
      TEST_SYNC_POINT("DBOptionsTest::EnableAutoCompactionAndTriggerStall:2");

      switch (option_type) {
        case 0:
          ASSERT_TRUE(dbfull()->TEST_write_controler().IsStopped());
          break;
        case 1:
          ASSERT_FALSE(dbfull()->TEST_write_controler().IsStopped());
          ASSERT_TRUE(dbfull()->TEST_write_controler().NeedsDelay());
          break;
        case 2:
          ASSERT_TRUE(dbfull()->TEST_write_controler().IsStopped());
          break;
        case 3:
          ASSERT_FALSE(dbfull()->TEST_write_controler().IsStopped());
          ASSERT_TRUE(dbfull()->TEST_write_controler().NeedsDelay());
          break;
      }
      TEST_SYNC_POINT("DBOptionsTest::EnableAutoCompactionAndTriggerStall:3");

      // Background compaction executed.
      dbfull()->TEST_WaitForCompact();
      ASSERT_FALSE(dbfull()->TEST_write_controler().IsStopped());
      ASSERT_FALSE(dbfull()->TEST_write_controler().NeedsDelay());
    }
  }
}

#endif  // ROCKSDB_LITE

}  // namespace rocksdb

int main(int argc, char** argv) {
  rocksdb::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}