#pragma region CPL License
/*
Nuclex Native Framework
Copyright (C) 2002-2021 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#pragma endregion // CPL License

// If the library is compiled as a DLL, this ensures symbols are exported
#define NUCLEX_STORAGE_SOURCE 1

#include "../../../Source/FileSystem/Windows/DateHelper.h"
#include <gtest/gtest.h>

#if defined(NUCLEX_STORAGE_WIN32)

namespace Nuclex { namespace Storage { namespace FileSystem { namespace Windows {

  // ------------------------------------------------------------------------------------------- //

  TEST(DateHelperTest, CanConvertFiletimeToPosixTime) {

    // The posix epoch begins on January 1st,1970, so this should be zero
    std::uint64_t filetime_1970_01_01 = 116444736000000000ULL;
    EXPECT_EQ(DateHelper::PosixTimeFromFileTime(filetime_1970_01_01), 0);

    // Try ten years later. This includes two leap years.
    // I let Wolfram alpha calculate the number of days inbetwen, it's 3652 days.
    std::uint64_t filetime_1980_01_01 = 119600064000000000ULL;
    EXPECT_EQ(DateHelper::PosixTimeFromFileTime(filetime_1980_01_01), (3652U * 86400ULL));

    // Example value: https://docs.microsoft.com/en-us/powerquery-m/datetime-fromfiletime
    // I let Wolfram alpha calculate the number of days from 1970 till this date,
    // dealing with leap years and everything. It's 15,545 days.
    std::uint64_t fileTime_2012_07_24_14_50_52_984 = 129876150529840000ULL;
    std::time_t posixTime_2012_07_24_14_50_53 = std::time_t(
      (15545 * 86400ULL) +
      (14 * 3600) +
      (50 * 60) +
      (53)
    );
    EXPECT_EQ(
      DateHelper::PosixTimeFromFileTime(fileTime_2012_07_24_14_50_52_984),
      posixTime_2012_07_24_14_50_53
    );

  }

  // ------------------------------------------------------------------------------------------- //

}}}} // namespace Nuclex::Storage::FileSystem::Windows

#endif // defined(NUCLEX_STORAGE_WIN32)