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#include "storage/tiny_storage.h"

#include <map>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include "base/file_util.h"
#include "base/port.h"
#include "storage/storage_interface.h"
#include "testing/base/public/googletest.h"
#include "testing/base/public/gunit.h"
#include "absl/flags/flag.h"
#include "absl/strings/str_format.h"

namespace mozc {
namespace storage {
namespace {

void CreateKeyValue(std::map<std::string, std::string> *output, int size) {
  output->clear();
  for (int i = 0; i < size; ++i) {
    char key[64];
    char value[64];
    absl::SNPrintF(key, sizeof(key), "key%d", i);
    absl::SNPrintF(value, sizeof(value), "value%d", i);
    output->insert(std::pair<std::string, std::string>(key, value));
  }
}

}  // namespace

class TinyStorageTest : public testing::Test {
 protected:
  TinyStorageTest() {}

  void SetUp() override { UnlinkDBFileIfExists(); }

  void TearDown() override { UnlinkDBFileIfExists(); }

  static void UnlinkDBFileIfExists() {
    const std::string path = GetTemporaryFilePath();
    if (FileUtil::FileExists(path)) {
      FileUtil::Unlink(path);
    }
  }

  static StorageInterface *CreateStorage() { return TinyStorage::New(); }

  static std::string GetTemporaryFilePath() {
    // This name should be unique to each test.
    return FileUtil::JoinPath(absl::GetFlag(FLAGS_test_tmpdir),
                              "TinyStorageTest_test.db");
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(TinyStorageTest);
};

TEST_F(TinyStorageTest, TinyStorageTest) {
  const std::string filename = GetTemporaryFilePath();

  static const int kSize[] = {10, 100, 1000};

  for (int i = 0; i < arraysize(kSize); ++i) {
    FileUtil::Unlink(filename);
    std::unique_ptr<StorageInterface> storage(CreateStorage());

    // Insert
    std::map<std::string, std::string> target;
    CreateKeyValue(&target, kSize[i]);
    {
      EXPECT_TRUE(storage->Open(filename));
      for (std::map<std::string, std::string>::const_iterator it =
               target.begin();
           it != target.end(); ++it) {
        EXPECT_TRUE(storage->Insert(it->first, it->second));
      }
    }

    // Lookup
    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      std::string value;
      EXPECT_TRUE(storage->Lookup(it->first, &value));
      EXPECT_EQ(value, it->second);
    }

    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      const std::string key = it->first + ".dummy";
      std::string value;
      EXPECT_FALSE(storage->Lookup(key, &value));
    }

    storage->Sync();

    std::unique_ptr<StorageInterface> storage2(CreateStorage());
    EXPECT_TRUE(storage2->Open(filename));
    EXPECT_EQ(storage->Size(), storage2->Size());

    // Lookup
    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      std::string value;
      EXPECT_TRUE(storage2->Lookup(it->first, &value));
      EXPECT_EQ(value, it->second);
    }

    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      const std::string key = it->first + ".dummy";
      std::string value;
      EXPECT_FALSE(storage2->Lookup(key, &value));
    }

    // Erase
    int id = 0;
    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      if (id % 2 == 0) {
        EXPECT_TRUE(storage->Erase(it->first));
        const std::string key = it->first + ".dummy";
        EXPECT_FALSE(storage->Erase(key));
      }
    }

    for (std::map<std::string, std::string>::const_iterator it = target.begin();
         it != target.end(); ++it) {
      std::string value;
      const std::string &key = it->first;
      if (id % 2 == 0) {
        EXPECT_FALSE(storage->Lookup(key, &value));
      } else {
        EXPECT_TRUE(storage->Lookup(key, &value));
      }
    }
  }
}

}  // namespace storage
}  // namespace mozc
