/**
 * Copyright (C) 2021 Saturneric <eric@bktus.com>
 *
 * This file is part of GpgFrontend.
 *
 * GpgFrontend is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GpgFrontend 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
 *
 * The initial version of the source code is inherited from
 * the gpg4usb project, which is under GPL-3.0-or-later.
 *
 * All the source code of GpgFrontend was modified and released by
 * Saturneric <eric@bktus.com> starting on May 12, 2021.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

#include "GpgKeyImportExporter.h"

#include "core/GpgModel.h"
#include "core/model/GpgImportInformation.h"
#include "core/utils/AsyncUtils.h"
#include "core/utils/GpgUtils.h"

namespace GpgFrontend {

GpgKeyImportExporter::GpgKeyImportExporter(int channel)
    : SingletonFunctionObject<GpgKeyImportExporter>(channel),
      ctx_(GpgContext::GetInstance(SingletonFunctionObject::GetChannel())) {}

/**
 * Import key pair
 * @param inBuffer input byte array
 * @return Import information
 */
auto GpgKeyImportExporter::ImportKey(const GFBuffer& in_buffer)
    -> std::shared_ptr<GpgImportInformation> {
  if (in_buffer.Empty()) return {};

  GpgData data_in(in_buffer);
  auto err = CheckGpgError(gpgme_op_import(ctx_.BinaryContext(), data_in));
  if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) return {};

  gpgme_import_result_t result;
  result = gpgme_op_import_result(ctx_.BinaryContext());
  gpgme_import_status_t status = result->imports;
  auto import_info = SecureCreateSharedObject<GpgImportInformation>(result);
  while (status != nullptr) {
    GpgImportInformation::GpgImportedKey key;
    key.import_status = static_cast<int>(status->status);
    key.fpr = status->fpr;
    import_info->imported_keys.emplace_back(key);
    status = status->next;
  }
  return import_info;
}

/**
 * Export keys
 * @param keys keys used
 * @param outBuffer output byte array
 * @return if success
 */
auto GpgKeyImportExporter::ExportKey(const GpgKey& key, bool secret, bool ascii,
                                     bool shortest, bool ssh_mode) const
    -> std::tuple<GpgError, GFBuffer> {
  if (!key.IsGood()) return {GPG_ERR_CANCELED, {}};

  int mode = 0;
  if (secret) mode |= GPGME_EXPORT_MODE_SECRET;
  if (shortest) mode |= GPGME_EXPORT_MODE_MINIMAL;
  if (ssh_mode) mode |= GPGME_EXPORT_MODE_SSH;

  std::vector<gpgme_key_t> keys_array;

  // Last entry data_in array has to be nullptr
  keys_array.emplace_back(key);
  keys_array.emplace_back(nullptr);

  GpgData data_out;
  auto* ctx = ascii ? ctx_.DefaultContext() : ctx_.BinaryContext();
  auto err = gpgme_op_export_keys(ctx, keys_array.data(), mode, data_out);
  if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) return {err, {}};

  return {err, data_out.Read2GFBuffer()};
}

/**
 * Export keys
 * @param keys keys used
 * @param outBuffer output byte array
 * @return if success
 */
void GpgKeyImportExporter::ExportKeys(const KeyArgsList& keys, bool secret,
                                      bool ascii, bool shortest, bool ssh_mode,
                                      const GpgOperationCallback& cb) const {
  RunGpgOperaAsync(
      [=](const DataObjectPtr& data_object) -> GpgError {
        if (keys.empty()) return GPG_ERR_CANCELED;

        int mode = 0;
        if (secret) mode |= GPGME_EXPORT_MODE_SECRET;
        if (shortest) mode |= GPGME_EXPORT_MODE_MINIMAL;
        if (ssh_mode) mode |= GPGME_EXPORT_MODE_SSH;

        std::vector<gpgme_key_t> keys_array(keys.begin(), keys.end());

        // Last entry data_in array has to be nullptr
        keys_array.emplace_back(nullptr);

        GpgData data_out;
        auto* ctx = ascii ? ctx_.DefaultContext() : ctx_.BinaryContext();
        auto err = gpgme_op_export_keys(ctx, keys_array.data(), mode, data_out);
        if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) return err;

        data_object->Swap({data_out.Read2GFBuffer()});
        return err;
      },
      cb, "gpgme_op_export_keys", "2.1.0");
}

/**
 * Export keys
 * @param keys keys used
 * @param outBuffer output byte array
 * @return if success
 */
void GpgKeyImportExporter::ExportAllKeys(const KeyArgsList& keys, bool secret,
                                         bool ascii,
                                         const GpgOperationCallback& cb) const {
  RunGpgOperaAsync(
      [=](const DataObjectPtr& data_object) -> GpgError {
        if (keys.empty()) return GPG_ERR_CANCELED;

        int mode = 0;
        std::vector<gpgme_key_t> keys_array(keys.begin(), keys.end());

        // Last entry data_in array has to be nullptr
        keys_array.emplace_back(nullptr);

        GpgData data_out;
        auto* ctx = ascii ? ctx_.DefaultContext() : ctx_.BinaryContext();
        auto err = gpgme_op_export_keys(ctx, keys_array.data(), mode, data_out);
        if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) return err;

        auto buffer = data_out.Read2GFBuffer();

        if (secret) {
          int mode = 0;
          mode |= GPGME_EXPORT_MODE_SECRET;

          GpgData data_out_secret;
          auto err = gpgme_op_export_keys(ctx, keys_array.data(), mode,
                                          data_out_secret);
          if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) return err;

          buffer.Append(data_out_secret.Read2GFBuffer());
        }

        data_object->Swap({buffer});
        return err;
      },
      cb, "gpgme_op_export_keys", "2.1.0");
}

}  // namespace GpgFrontend
