/**
 * Copyright (C) 2021 Saturneric
 *
 * 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 "GpgCommandExecutor.h"

#include "GpgFunctionObject.h"
#include "core/thread/TaskRunnerGetter.h"

GpgFrontend::GpgCommandExecutor::GpgCommandExecutor(int channel)
    : SingletonFunctionObject<GpgCommandExecutor>(channel) {}

void GpgFrontend::GpgCommandExecutor::Execute(
    std::string cmd, std::vector<std::string> arguments,
    std::function<void(int, std::string, std::string)> callback,
    std::function<void(QProcess *)> interact_func) {
  LOG(INFO) << "called"
            << "cmd" << cmd << "arguments size" << arguments.size();

  Thread::Task::TaskCallback result_callback =
      [](int rtn, Thread::Task::DataObjectPtr data_object) {
        LOG(INFO) << "called";

        if (data_object->GetObjectSize() != 4)
          throw std::runtime_error("invalid data object size");

        auto exit_code = data_object->PopObject<int>();
        auto process_stdout = data_object->PopObject<std::string>();
        auto process_stderr = data_object->PopObject<std::string>();
        auto callback = data_object->PopObject<
            std::function<void(int, std::string, std::string)>>();

        // call callback
        callback(exit_code, process_stdout, process_stderr);
      };

  Thread::Task::TaskRunnable runner =
      [](GpgFrontend::Thread::Task::DataObjectPtr data_object) -> int {
    LOG(INFO) << "process runner called, data object size"
              << data_object->GetObjectSize();

    if (data_object->GetObjectSize() != 4)
      throw std::runtime_error("invalid data object size");

    // get arguments
    auto cmd = data_object->PopObject<std::string>();
    LOG(INFO) << "get cmd" << cmd;
    auto arguments = data_object->PopObject<std::vector<std::string>>();
    auto interact_func =
        data_object->PopObject<std::function<void(QProcess *)>>();

    auto *cmd_process = new QProcess();
    cmd_process->setProcessChannelMode(QProcess::MergedChannels);

    QObject::connect(cmd_process, &QProcess::started,
                     []() -> void { LOG(INFO) << "process started"; });
    QObject::connect(
        cmd_process, &QProcess::readyReadStandardOutput,
        [interact_func, cmd_process]() { interact_func(cmd_process); });
    QObject::connect(cmd_process, &QProcess::errorOccurred, [=]() {
      LOG(ERROR) << "error in executing command:" << cmd;
    });
    QObject::connect(cmd_process,
                     qOverload<int, QProcess::ExitStatus>(&QProcess::finished),
                     [=](int, QProcess::ExitStatus status) {
                       if (status == QProcess::NormalExit)
                         LOG(INFO) << "succeed in executing command:" << cmd;
                       else
                         LOG(WARNING) << "error in executing command:" << cmd;
                     });

    cmd_process->setProgram(QString::fromStdString(cmd));

    QStringList q_arguments;
    for (const auto &argument : arguments)
      q_arguments.append(QString::fromStdString(argument));
    cmd_process->setArguments(q_arguments);

    LOG(INFO) << "process execute ready";

    cmd_process->start();
    cmd_process->waitForFinished(30);

    std::string process_stdout =
                    cmd_process->readAllStandardOutput().toStdString(),
                process_stderr =
                    cmd_process->readAllStandardError().toStdString();
    int exit_code = cmd_process->exitCode();

    cmd_process->close();
    cmd_process->deleteLater();

    // transfer result
    data_object->AppendObject(std::move(process_stderr));
    data_object->AppendObject(std::move(process_stdout));
    data_object->AppendObject(std::move(exit_code));

    return 0;
  };

  // data transfer into task
  auto data_object = std::make_shared<Thread::Task::DataObject>();
  data_object->AppendObject(std::move(callback));
  data_object->AppendObject(std::move(interact_func));
  data_object->AppendObject(std::move(arguments));
  data_object->AppendObject(std::move(cmd));

  auto *process_task = new GpgFrontend::Thread::Task(
      std::move(runner), std::move(result_callback), data_object);

  QEventLoop looper;
  QObject::connect(process_task, &Thread::Task::SignalTaskFinished, &looper,
                   &QEventLoop::quit);

  GpgFrontend::Thread::TaskRunnerGetter::GetInstance()
      .GetTaskRunner(Thread::TaskRunnerGetter::kTaskRunnerType_External_Process)
      ->PostTask(process_task);

  // block until task finished
  // this is to keep reference vaild until task finished
  looper.exec();
}