/* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program 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
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include <my_global.h>
#include <gtest/gtest.h>
#include "mock_logger.h"
#include "file_io.h"
#include "test_utils.h"

#if defined(HAVE_PSI_INTERFACE)
#if !defined(MERGE_UNITTESTS)
namespace keyring
{
  PSI_memory_key key_memory_KEYRING = PSI_NOT_INSTRUMENTED;
  PSI_memory_key key_LOCK_keyring = PSI_NOT_INSTRUMENTED;
}
#endif
namespace keyring
{
  extern PSI_file_key keyring_file_data_key;
  extern PSI_file_key keyring_backup_file_data_key;
}
#endif

namespace keyring__file_io_unittest
{
  using ::testing::StrEq;
  using ::testing::StartsWith;
  using keyring::Mock_logger;
  using my_testing::Server_initializer;

  class File_io_test : public ::testing::Test
  {
  protected:
    virtual void SetUp()
    {
      keyring::keyring_file_data_key = PSI_NOT_INSTRUMENTED;
      keyring::keyring_backup_file_data_key = PSI_NOT_INSTRUMENTED;
      logger= new Mock_logger();
      initializer.SetUp();

      //Set user as super
      Security_context* sec_ctx= current_thd->security_context();
      sec_ctx->set_master_access(sec_ctx->master_access() | SUPER_ACL);
    }

    virtual void TearDown()
    {
      delete logger;
      initializer.TearDown();
    }

  protected:
    Server_initializer initializer; //needed to initialize current_thd
    Mock_logger *logger;
  };

  //Those tests are to check if methods inside File_io do not call my_error but
  //instead generate warnings for filesystem operations errors. If one of those
  //functions would call my_error then error would be set and we would have to call
  //initializer.set_expected_error. As we do not call this in any functions this
  //proves that my_error is not called. Also these tests make sure that correct
  //messages are generated

  TEST_F(File_io_test, OpenNotExistingFile)
  {
    keyring::File_io file_io(logger);
    remove("./some_funny_name"); //just to be sure some_funny_name does not exist

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StrEq("File './some_funny_name' not found "
                                   "(Errcode: 2 - No such file or directory)")));
    File file= file_io.open(keyring::keyring_file_data_key, "./some_funny_name",
                             O_RDONLY, MYF(MY_WME));
    ASSERT_TRUE(file < 0); //could not open the file
  }

  TEST_F(File_io_test, CloseTwiceTheSame)
  {
    keyring::File_io file_io(logger);

    File file= file_io.open(keyring::keyring_file_data_key, "./some_funny_name",
                            O_RDONLY | O_CREAT, MYF(MY_WME));
    ASSERT_TRUE(file >= 0); //successfully created
    file_io.close(file, MYF(MY_WME));

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Error on close of")));
    ASSERT_TRUE(file_io.close(file, MYF(MY_WME)) != 0);

    remove("./some_funny_name");
  }

  TEST_F(File_io_test, ReadFromInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;
    uchar buff[2];

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Error reading file")));
    ASSERT_TRUE(file_io.read(file, buff, 10, MYF(MY_WME)) != 10);
  }

  TEST_F(File_io_test, WriteToInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Error writing file")));
    ASSERT_TRUE(file_io.write(file, reinterpret_cast<const uchar*>("123"), 10,
                              MYF(MY_WME)) != 10);
  }

  TEST_F(File_io_test, SeekOnInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Can't seek in file")));
    ASSERT_TRUE(file_io.seek(file, 0, MY_SEEK_END, MYF(MY_WME)) == MY_FILEPOS_ERROR);
  }

  TEST_F(File_io_test, TellOnInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Can't seek in file")));
    ASSERT_TRUE(file_io.tell(file, MYF(MY_WME)) == ((my_off_t) -1));
  }

  TEST_F(File_io_test, SyncOnInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Can't sync file")));
    ASSERT_TRUE(file_io.sync(file, MYF(MY_WME)) != 0);
  }

  TEST_F(File_io_test, FStatOnInvalidFileDescriptor)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Error while reading stat for")));
    MY_STAT keyring_file_stat;
    ASSERT_TRUE(file_io.fstat(file, &keyring_file_stat, MYF(MY_WME)) != 0);
  }

  TEST_F(File_io_test, RemoveNotExistingFile)
  {
    keyring::File_io file_io(logger);
    remove("./some_funny_name"); //just to be sure some_funny_name does not exist

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StrEq("Could not remove file ./some_funny_name OS "
                                   "retuned this error: No such file or directory")));
    ASSERT_TRUE(file_io.remove("./some_funny_name", MYF(MY_WME)) != 0);
  }

  TEST_F(File_io_test, TruncateOnNotExistingFile)
  {
    keyring::File_io file_io(logger);
    File file=2050;

    EXPECT_CALL(*logger, log(MY_ERROR_LEVEL,
                             StartsWith("Could not truncate file")));
    ASSERT_TRUE(file_io.truncate(file, MYF(MY_WME)) != 0);
  }

} //namespace keyring__file_io_unittest
