// Copyright 2010-2018, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "gui/base/msime_user_dictionary_importer.h"

#ifdef OS_WIN
#include <windows.h>

// In general, mixing different NTDDI_VERSION/_WIN32_WINNT values in a single
// executable file is not safe, but <msime.h> requires NTDDI_WIN8 to use COM
// interfaces and constants defined there, even though those APIs are available
// on older platforms such as Windows 7.
// To work around this limitation, here we intentionally re-define those macros.
// TODO(yukawa): Remove the following hack when we stop supporting Windows 7.

// Redefine NTDDI_VERSION with NTDDI_WIN8
#ifdef NTDDI_VERSION
#define MOZC_ORIGINAL_NTDDI_VERSION NTDDI_VERSION
#undef NTDDI_VERSION
#endif  // NTDDI_VERSION
#define NTDDI_VERSION 0x06020000  // == NTDDI_WIN8

// Redefine _WIN32_WINNT with WIN32_WINNT_WIN8
#ifdef _WIN32_WINNT
#define MOZC_ORIGINAL_WIN32_WINNT _WIN32_WINNT
#undef _WIN32_WINNT
#endif  // MOZC_ORIGINAL_WIN32_WINNT
#define _WIN32_WINNT 0x0602       // == WIN32_WINNT_WIN8

#include <msime.h>

// Restore NTDDI_VERSION
#ifdef MOZC_ORIGINAL_NTDDI_VERSION
#undef NTDDI_VERSION
#define NTDDI_VERSION MOZC_ORIGINAL_NTDDI_VERSION
#endif  // MOZC_ORIGINAL_NTDDI_VERSION

// Restore _WIN32_WINNT
#ifdef MOZC_ORIGINAL_WIN32_WINNT
#undef _WIN32_WINNT
#define _WIN32_WINNT MOZC_ORIGINAL_WIN32_WINNT
#endif  // MOZC_ORIGINAL_WIN32_WINNT

#include <algorithm>
#include <map>
#include <set>
#include <string>
#include <vector>

#include "base/compiler_specific.h"
#include "base/hash.h"
#include "base/logging.h"
#include "base/mmap.h"
#include "base/number_util.h"
#include "base/port.h"
#include "base/system_util.h"
#include "base/util.h"
#include "base/win_util.h"
#include "dictionary/user_dictionary_util.h"
#include "gui/base/encoding_util.h"

namespace mozc {

using user_dictionary::UserDictionary;
using user_dictionary::UserDictionaryCommandStatus;

namespace {

const size_t kBufferSize = 256;

// ProgID of MS-IME Japanese.
const wchar_t kVersionIndependentProgIdForMSIME[] = L"MSIME.Japan";

// Interface identifier of user dictionary in MS-IME.
// {019F7153-E6DB-11d0-83C3-00C04FDDB82E}
const GUID kIidIFEDictionary = {
  0x19f7153, 0xe6db, 0x11d0, {0x83, 0xc3, 0x0, 0xc0, 0x4f, 0xdd, 0xb8, 0x2e}
};

IFEDictionary *CreateIFEDictionary() {
  CLSID class_id = GUID_NULL;
  // On Windows 7 and prior, multiple versions of MS-IME can be installed
  // side-by-side. As far as we've observed, the latest version will be chosen
  // with version-independent ProgId.
  HRESULT result = ::CLSIDFromProgID(kVersionIndependentProgIdForMSIME,
                                     &class_id);
  if (FAILED(result)) {
    LOG(ERROR) << "CLSIDFromProgID() failed: " << result;
    return nullptr;
  }
  IFEDictionary *obj = nullptr;
  result = ::CoCreateInstance(class_id,
                              nullptr,
                              CLSCTX_INPROC_SERVER,
                              kIidIFEDictionary,
                              reinterpret_cast<void **>(&obj));
  if (FAILED(result)) {
    LOG(ERROR) << "CoCreateInstance() failed: " << result;
    return nullptr;
  }
  VLOG(1) << "Can create IFEDictionary successfully";
  return obj;
}

class ScopedIFEDictionary {
 public:
  explicit ScopedIFEDictionary(IFEDictionary *dic)
      : dic_(dic) {}

  ~ScopedIFEDictionary() {
    if (dic_ != NULL) {
      dic_->Close();
      dic_->Release();
    }
  }

  IFEDictionary & operator*() const { return *dic_; }
  IFEDictionary* operator->() const { return dic_; }
  IFEDictionary* get() const { return dic_; }

 private:
  IFEDictionary *dic_;
};

// Iterator for MS-IME user dictionary
class MSIMEImportIterator
    : public UserDictionaryImporter::InputIteratorInterface {
 public:
  MSIMEImportIterator()
      : dic_(CreateIFEDictionary()),
        buf_(kBufferSize), result_(E_FAIL), size_(0), index_(0) {
    if (dic_.get() == NULL) {
      LOG(ERROR) << "IFEDictionaryFactory returned NULL";
      return;
    }

    // open user dictionary
    HRESULT result = dic_->Open(NULL, NULL);
    if (S_OK != result) {
      LOG(ERROR) << "Cannot open user dictionary: " << result_;
      return;
    }

    POSTBL *pos_table = NULL;
    int pos_size = 0;
    result_ = dic_->GetPosTable(&pos_table, &pos_size);
    if (S_OK != result_ || pos_table == NULL || pos_size == 0) {
      LOG(ERROR) << "Cannot get POS table: " << result;
      result_ = E_FAIL;
      return;
    }

    string name;
    for (int i = 0; i < pos_size; ++i) {
      EncodingUtil::SJISToUTF8(
          reinterpret_cast<char *>(pos_table->szName), &name);
      pos_map_.insert(std::make_pair(pos_table->nPos, name));
      ++pos_table;
    }

    // extract all words registered by user.
    // Don't use auto-registered words, since Mozc may not be able to
    // handle auto_registered words correctly, and user is basically
    // unaware of auto-registered words.
    result_ = dic_->GetWords(NULL, NULL, NULL,
                             IFED_POS_ALL,
                             IFED_SELECT_ALL,
                             IFED_REG_USER,  // | FED_REG_AUTO
                             reinterpret_cast<UCHAR *>(&buf_[0]),
                             kBufferSize * sizeof(IMEWRD),
                             &size_);
  }

  bool IsAvailable() const {
    return result_ == IFED_S_MORE_ENTRIES || result_ == S_OK;
  }

  // NOTE: Without "UserDictionaryImporter::", Visual C++ 2008 somehow fails
  //     to look up the type name.
  bool Next(UserDictionaryImporter::RawEntry *entry) {
    if (!IsAvailable()) {
      LOG(ERROR) << "Iterator is not available";
      return false;
    }

    if (entry == NULL) {
      LOG(ERROR) << "Entry is NULL";
      return false;
    }
    entry->Clear();

    if (index_ < size_) {
      if (buf_[index_].pwchReading == NULL ||
          buf_[index_].pwchDisplay == NULL) {
        ++index_;
        LOG(ERROR) << "pwchDisplay or pwchReading is NULL";
        return true;
      }

      // set key/value
      Util::WideToUTF8(buf_[index_].pwchReading, &entry->key);
      Util::WideToUTF8(buf_[index_].pwchDisplay, &entry->value);

      // set POS
      std::map<int, string>::const_iterator it =
          pos_map_.find(buf_[index_].nPos1);
      if (it == pos_map_.end()) {
        ++index_;
        LOG(ERROR) << "Unknown POS id: " << buf_[index_].nPos1;
        entry->Clear();
        return true;
      }
      entry->pos = it->second;

      // set comment
      if (buf_[index_].pvComment != NULL) {
        if (buf_[index_].uct == IFED_UCT_STRING_SJIS) {
          EncodingUtil::SJISToUTF8(
              reinterpret_cast<const char *>(buf_[index_].pvComment),
              &entry->comment);
        } else if (buf_[index_].uct == IFED_UCT_STRING_UNICODE) {
          Util::WideToUTF8(
              reinterpret_cast<const wchar_t *>(buf_[index_].pvComment),
              &entry->comment);
        }
      }
    }

    if (index_ < size_) {
      ++index_;
      return true;
    } else if (result_ == S_OK) {
      return false;
    } else if (result_ == IFED_S_MORE_ENTRIES) {
      result_ = dic_->NextWords(reinterpret_cast<UCHAR *>(&buf_[0]),
                                kBufferSize * sizeof(IMEWRD),
                               &size_);
      if (result_ == E_FAIL) {
        LOG(ERROR) << "NextWords() failed";
        return false;
      }
      index_ = 0;
      return true;
    }

    return false;
  }

 private:
  std::vector<IMEWRD> buf_;
  ScopedIFEDictionary dic_;
  std::map<int, string> pos_map_;
  HRESULT result_;
  ULONG size_;
  ULONG index_;
};

}  // namespace

namespace gui {

UserDictionaryImporter::InputIteratorInterface *
MSIMEUserDictionarImporter::Create() {
  return new MSIMEImportIterator;
}

}  // namespace gui
}  // namespace mozc

#else  // OS_WIN

namespace mozc {
namespace gui {

UserDictionaryImporter::InputIteratorInterface *
MSIMEUserDictionarImporter::Create() {
  return nullptr;
}

}  // namespace gui
}  // namespace mozc

#endif  // OS_WIN