/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2021 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/


#if ORTHANC_UNIT_TESTS_LINK_FRAMEWORK == 1
// Must be the first to be sure to use the Orthanc framework shared library
#  include <OrthancFramework.h>
#endif

#include <gtest/gtest.h>

#include "../Sources/Compression/HierarchicalZipWriter.h"
#include "../Sources/Compression/ZipReader.h"
#include "../Sources/OrthancException.h"
#include "../Sources/SystemToolbox.h"
#include "../Sources/TemporaryFile.h"
#include "../Sources/Toolbox.h"


using namespace Orthanc;

TEST(ZipWriter, Basic)
{
  Orthanc::ZipWriter w;
  w.SetOutputPath("UnitTestsResults/hello.zip");
  w.Open();
  w.OpenFile("world/hello");
  w.Write("Hello world");
}


TEST(ZipWriter, Basic64)
{
  Orthanc::ZipWriter w;
  w.SetOutputPath("UnitTestsResults/hello64.zip");
  w.SetZip64(true);
  w.Open();
  w.OpenFile("world/hello");
  w.Write("Hello world");
}


TEST(ZipWriter, Exceptions)
{
  Orthanc::ZipWriter w;
  ASSERT_THROW(w.Open(), Orthanc::OrthancException);
  w.SetOutputPath("UnitTestsResults/hello3.zip");
  w.Open();
  ASSERT_THROW(w.Write("hello world"), Orthanc::OrthancException);
}


TEST(ZipWriter, Append)
{
  {
    Orthanc::ZipWriter w;
    w.SetAppendToExisting(false);
    w.SetOutputPath("UnitTestsResults/append.zip");
    w.Open();
    w.OpenFile("world/hello");
    w.Write("Hello world 1");
  }

  {
    Orthanc::ZipWriter w;
    w.SetAppendToExisting(true);
    w.SetOutputPath("UnitTestsResults/append.zip");
    w.Open();
    w.OpenFile("world/appended");
    w.Write("Hello world 2");
  }
}





namespace Orthanc
{
  // The namespace is necessary
  // http://code.google.com/p/googletest/wiki/AdvancedGuide#Private_Class_Members

  TEST(HierarchicalZipWriter, Index)
  {
    HierarchicalZipWriter::Index i;
    ASSERT_EQ("hello", i.OpenFile("hello"));
    ASSERT_EQ("hello-2", i.OpenFile("hello"));
    ASSERT_EQ("coucou", i.OpenFile("coucou"));
    ASSERT_EQ("hello-3", i.OpenFile("hello"));

    i.OpenDirectory("coucou");

    ASSERT_EQ("coucou-2/world", i.OpenFile("world"));
    ASSERT_EQ("coucou-2/world-2", i.OpenFile("world"));

    i.OpenDirectory("world");
  
    ASSERT_EQ("coucou-2/world-3/hello", i.OpenFile("hello"));
    ASSERT_EQ("coucou-2/world-3/hello-2", i.OpenFile("hello"));

    i.CloseDirectory();

    ASSERT_EQ("coucou-2/world-4", i.OpenFile("world"));

    i.CloseDirectory();

    ASSERT_EQ("coucou-3", i.OpenFile("coucou"));

    ASSERT_THROW(i.CloseDirectory(), OrthancException);
  }


  TEST(HierarchicalZipWriter, Filenames)
  {
    ASSERT_EQ("trE hell", HierarchicalZipWriter::Index::KeepAlphanumeric("    ÊtrE hellô  "));

    // The "^" character is considered as a space in DICOM
    ASSERT_EQ("Hel lo world", HierarchicalZipWriter::Index::KeepAlphanumeric("    Hel^^  ^\r\n\t^^lo  \t  <world>  "));
  }
}


TEST(HierarchicalZipWriter, Basic)
{
  static const std::string SPACES = "                             ";

  HierarchicalZipWriter w("UnitTestsResults/hello2.zip");

  w.SetCompressionLevel(0);

  // Inside "/"
  w.OpenFile("hello");
  w.Write(SPACES + "hello\n");
  w.OpenFile("hello");
  w.Write(SPACES + "hello-2\n");
  w.OpenDirectory("hello");

  // Inside "/hello-3"
  w.OpenFile("hello");
  w.Write(SPACES + "hello\n");
  w.OpenDirectory("hello");

  w.SetCompressionLevel(9);

  // Inside "/hello-3/hello-2"
  w.OpenFile("hello");
  w.Write(SPACES + "hello\n");
  w.OpenFile("hello");
  w.Write(SPACES + "hello-2\n");
  w.CloseDirectory();

  // Inside "/hello-3"
  w.OpenFile("hello");
  w.Write(SPACES + "hello-3\n");

  /**

     TO CHECK THE CONTENT OF THE "hello2.zip" FILE:

     # unzip -v hello2.zip 

     => There must be 6 files. The first 3 files must have a negative
     compression ratio.

  **/
}


TEST(ZipReader, Basic)
{
  TemporaryFile f;
  
  {
    Orthanc::ZipWriter w;
    ASSERT_EQ(0u, w.GetArchiveSize());

    w.SetOutputPath(f.GetPath().c_str());
    w.Open();
    w.OpenFile("world/hello");
    w.Write("Hello world");

    ASSERT_EQ(w.GetArchiveSize(), SystemToolbox::GetFileSize(f.GetPath()));
  }

  ASSERT_TRUE(ZipReader::IsZipFile(f.GetPath()));

  std::unique_ptr<ZipReader> reader(ZipReader::CreateFromFile(f.GetPath()));

  ASSERT_EQ(1u, reader->GetFilesCount());
  
  std::string filename, content;
  ASSERT_TRUE(reader->ReadNextFile(filename, content));
  ASSERT_EQ("world/hello", filename);
  ASSERT_EQ("Hello world", content);
  ASSERT_FALSE(reader->ReadNextFile(filename, content));
}



TEST(ZipWriter, Stream)
{
  std::string memory;

  std::string large;
  large.resize(4 * 65536);
  for (size_t i = 0; i < large.size(); i++)
  {
    large[i] = rand() % 256;
  }

  for (int i = 0; i < 2; i++)
  {
    {
      Orthanc::ZipWriter w;
      w.SetMemoryOutput(memory, (i == 0) /* ZIP64? */);
      w.Open();

      w.OpenFile("world/hello");
      w.Write("Hello");
      w.CancelStream();
    }

    ASSERT_THROW(ZipReader::CreateFromMemory(memory), Orthanc::OrthancException);

    memory.clear();
    uint64_t archiveSize;
    
    {
      Orthanc::ZipWriter w;
      ASSERT_EQ(0u, w.GetArchiveSize());
      
      w.SetMemoryOutput(memory, (i == 0) /* ZIP64? */);
      w.Open();

      ASSERT_EQ(0u, w.GetArchiveSize());
      
      w.OpenFile("world/hello");
      w.Write(large);
      w.OpenFile("world/hello2");
      w.Write(large);
      w.OpenFile("world/hello3");
      w.Write("Hello world");
      w.OpenFile("world/hello4");
      w.Write(large);

      ASSERT_TRUE(memory.empty());

      uint64_t s1 = w.GetArchiveSize();      
      ASSERT_NE(0u, s1);

      w.Close();
      archiveSize = w.GetArchiveSize();

      ASSERT_NE(archiveSize, s1);
      ASSERT_EQ(archiveSize, w.GetArchiveSize());
    }

    ASSERT_EQ(archiveSize, memory.size());
    
    std::unique_ptr<ZipReader> reader(ZipReader::CreateFromMemory(memory));

    ASSERT_EQ(4u, reader->GetFilesCount());

    {
      std::string filename, content;
      ASSERT_TRUE(reader->ReadNextFile(filename, content));
      ASSERT_EQ("world/hello", filename);
      ASSERT_EQ(large.size(), content.size());
      ASSERT_TRUE(memcmp(large.c_str(), content.c_str(), large.size()) == 0);
    }
  
    {
      std::string filename, content;
      ASSERT_TRUE(reader->ReadNextFile(filename, content));
      ASSERT_EQ("world/hello2", filename);
      ASSERT_EQ(large.size(), content.size());
      ASSERT_TRUE(memcmp(large.c_str(), content.c_str(), large.size()) == 0);
    }

    {
      std::string filename, content;
      ASSERT_TRUE(reader->ReadNextFile(filename, content));
      ASSERT_EQ("world/hello3", filename);
      ASSERT_EQ("Hello world", content);
    }
  
    {
      std::string filename, content;
      ASSERT_TRUE(reader->ReadNextFile(filename, content));
      ASSERT_EQ("world/hello4", filename);
      ASSERT_EQ(large.size(), content.size());
      ASSERT_TRUE(memcmp(large.c_str(), content.c_str(), large.size()) == 0);
    }
  
    {
      std::string filename, content;
      ASSERT_FALSE(reader->ReadNextFile(filename, content));
    }
  }
}


namespace Orthanc
{
  // The namespace is necessary because of FRIEND_TEST
  // http://code.google.com/p/googletest/wiki/AdvancedGuide#Private_Class_Members
  
  TEST(ZipWriter, BufferWithSeek)
  {
    ZipWriter::BufferWithSeek buffer;
    ASSERT_EQ(0u, buffer.GetSize());

    std::string s;
    buffer.Flush(s);
    ASSERT_TRUE(s.empty());

    buffer.Write("hello");
    ASSERT_EQ(5u, buffer.GetSize());
    ASSERT_EQ(5u, buffer.GetPosition());
    buffer.Write("world");
    ASSERT_EQ(10u, buffer.GetSize());
    ASSERT_EQ(10u, buffer.GetPosition());
    buffer.Flush(s);
    ASSERT_EQ("helloworld", s);
    ASSERT_EQ(0u, buffer.GetSize());
    ASSERT_EQ(0u, buffer.GetPosition());

    buffer.Write("hello world");
    buffer.Seek(4);
    ASSERT_EQ(4u, buffer.GetPosition());
    buffer.Write("ab");
    ASSERT_EQ(6u, buffer.GetPosition());
    buffer.Flush(s);
    ASSERT_EQ("hellabworld", s);
    ASSERT_EQ(0u, buffer.GetPosition());

    buffer.Seek(0);
    ASSERT_EQ(0u, buffer.GetPosition());
    buffer.Write("abc");
    buffer.Write("");
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Seek(3);
    ASSERT_THROW(buffer.Seek(4), OrthancException);
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Write("de");
    buffer.Write("");
    ASSERT_EQ(5u, buffer.GetPosition());
    buffer.Seek(3);
    buffer.Seek(3);
    ASSERT_EQ(3u, buffer.GetPosition());
    ASSERT_THROW(buffer.Write("def"), OrthancException);
    buffer.Write("");
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Write("fg");
    ASSERT_EQ(5u, buffer.GetPosition());
    buffer.Write("hi");
    ASSERT_EQ(7u, buffer.GetPosition());
    buffer.Flush(s);
    ASSERT_EQ("abcfghi", s);
    ASSERT_EQ(0u, buffer.GetPosition());

    buffer.Write("abc");
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Seek(2);
    ASSERT_EQ(2u, buffer.GetPosition());
    buffer.Write("z");
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Seek(1);
    ASSERT_EQ(1u, buffer.GetPosition());
    buffer.Write("y");
    ASSERT_EQ(2u, buffer.GetPosition());
    buffer.Flush(s);
    ASSERT_EQ("ayz", s);
    ASSERT_EQ(0u, buffer.GetPosition());

    ASSERT_EQ(0u, buffer.GetPosition());
    buffer.Write("abc");
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Seek(1);
    ASSERT_EQ(1u, buffer.GetPosition());
    buffer.Write("z");
    ASSERT_EQ(2u, buffer.GetPosition());
    buffer.Seek(3);
    ASSERT_EQ(3u, buffer.GetPosition());
    buffer.Write("y");
    ASSERT_EQ(4u, buffer.GetPosition());
    buffer.Flush(s);
    ASSERT_EQ("azcy", s);
    ASSERT_EQ(0u, buffer.GetPosition());

    buffer.Flush(s);
    ASSERT_TRUE(s.empty());
    ASSERT_EQ(0u, buffer.GetPosition());
  }
}