#include "gtest/gtest.h"
#include "leveldb/env.h"
#include "leveldb/db.h"

using namespace leveldb;

constexpr int value_size = 2048;
constexpr int data_size = 128 << 20;

Status OpenDB(std::string dbName, DB **db) {
  Options options;
  options.create_if_missing = true;
  return DB::Open(options, dbName, db);
}

void InsertData(DB *db, uint64_t ttl/* second */) {
  WriteOptions writeOptions;
  int key_num = data_size / value_size;
  srand(0);

  for (int i = 0; i < key_num; i++) {
    int key_ = rand() % key_num+1;
    std::string key = std::to_string(key_);
    std::string value(value_size, 'a');
    db->Put(writeOptions, key, value, ttl);
  }
}

void GetData(DB *db, int size = (1 << 30)) {
  ReadOptions readOptions;
  int key_num = data_size / value_size;
  
  // 点查
  srand(0);
  for (int i = 0; i < 100; i++) {
    int key_ = rand() % key_num+1;
    std::string key = std::to_string(key_);
    std::string value;
    db->Get(readOptions, key, &value);
  }
}

TEST(TestTTL, ReadTTL) {
    DB *db;
    if(OpenDB("testdb", &db).ok() == false) {
        std::cerr << "open db failed" << std::endl;
        abort();
    }

    uint64_t ttl = 20;

    InsertData(db, ttl);

    ReadOptions readOptions;
    Status status;
    int key_num = data_size / value_size;
    srand(0);
    for (int i = 0; i < 100; i++) {
        int key_ = rand() % key_num+1;
        std::string key = std::to_string(key_);
        std::string value;
        status = db->Get(readOptions, key, &value);
        ASSERT_TRUE(status.ok());
    }

    Env::Default()->SleepForMicroseconds(ttl * 1000000);

    for (int i = 0; i < 100; i++) {
        int key_ = rand() % key_num+1;
        std::string key = std::to_string(key_);
        std::string value;
        status = db->Get(readOptions, key, &value);
        ASSERT_FALSE(status.ok());
    }

    delete db;
}

TEST(TestTTL, CompactionTTL) {
    DB *db;

    if(OpenDB("testdb", &db).ok() == false) {
        std::cerr << "open db failed" << std::endl;
        abort();
    }

    uint64_t ttl = 20;
    InsertData(db, ttl);

    leveldb::Range ranges[1];
    ranges[0] = leveldb::Range("-", "A");
    uint64_t sizes[1];
    db->GetApproximateSizes(ranges, 1, sizes);
    ASSERT_GT(sizes[0], 0);
    Env::Default()->SleepForMicroseconds(ttl * 1000000);

    db->CompactRange(nullptr, nullptr);
    leveldb::Range ranges1[1];
    ranges1[0] = leveldb::Range("-", "A");
    uint64_t sizes1[1];
    db->GetApproximateSizes(ranges1, 1, sizes1);
    ASSERT_EQ(sizes1[0], 0);

    delete db;
}

// Time-consuming when kNumLevels is 7, so run this test when kNumLevels is set to 3,
// the codes on branch light_ver is a version with kNumLevels set to 3.
// In this case level 2 is the last level with files.
TEST(TestTTL, LastLevelCompaction) {
  DB *db;

  if(OpenDB("testdb", &db).ok() == false) {
    std::cerr << "open db failed" << std::endl;
    abort();
  }

  uint64_t ttl = 20;
  InsertData(db, ttl);

  leveldb::Range ranges[1];
  ranges[0] = leveldb::Range("-", "A");
  uint64_t sizes[1];
  db->GetApproximateSizes(ranges, 1, sizes);
  ASSERT_GT(sizes[0], 0);

  std::string last_level_file_num;
  std::string last_level = "2";
  db->GetProperty("leveldb.num-files-at-level" + last_level, &last_level_file_num);
  std::cout << "File nums in last level: " << last_level_file_num << std::endl;
  ASSERT_GT(std::atoi(last_level_file_num.c_str()), 0);

  Env::Default()->SleepForMicroseconds(ttl * 1000000);

  db->CompactRange(nullptr, nullptr);
  leveldb::Range ranges1[1];
  ranges1[0] = leveldb::Range("-", "A");
  uint64_t sizes1[1];
  db->GetApproximateSizes(ranges1, 1, sizes1);
  ASSERT_EQ(sizes1[0], 0);

  delete db;
}


int main(int argc, char** argv) {
  // All tests currently run with the same read-only file limits.
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}