/**
 * 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 "AboutDialog.h"

#include <openssl/opensslv.h>

#include "GpgFrontendBuildInfo.h"
#include "core/function/GlobalSettingStation.h"
#include "core/thread/TaskRunnerGetter.h"
#include "ui/dialog/help/GnupgTab.h"
#include "ui/thread/VersionCheckTask.h"

namespace GpgFrontend::UI {

AboutDialog::AboutDialog(int defaultIndex, QWidget* parent)
    : GeneralDialog(typeid(AboutDialog).name(), parent) {
  this->setWindowTitle(QString(_("About")) + " " + qApp->applicationName());

  auto* tab_widget = new QTabWidget;
  auto* info_tab = new InfoTab();
  auto* gnupg_tab = new GnupgTab();
  auto* translators_tab = new TranslatorsTab();
  update_tab_ = new UpdateTab();

  tab_widget->addTab(info_tab, _("About GpgFrontend"));
  tab_widget->addTab(gnupg_tab, _("GnuPG"));
  tab_widget->addTab(translators_tab, _("Translators"));
  tab_widget->addTab(update_tab_, _("Update"));

  connect(tab_widget, &QTabWidget::currentChanged, this,
          [&](int index) { SPDLOG_DEBUG("current index: {}", index); });

  if (defaultIndex < tab_widget->count() && defaultIndex >= 0) {
    tab_widget->setCurrentIndex(defaultIndex);
  }

  auto* buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok);
  connect(buttonBox, &QDialogButtonBox::accepted, this, &AboutDialog::close);

  auto* mainLayout = new QVBoxLayout;
  mainLayout->addWidget(tab_widget);
  mainLayout->addWidget(buttonBox);
  setLayout(mainLayout);

  this->resize(550, 650);
  this->setMinimumWidth(450);
  this->show();
}

void AboutDialog::showEvent(QShowEvent* ev) {
  QDialog::showEvent(ev);
  update_tab_->getLatestVersion();
}

InfoTab::InfoTab(QWidget* parent) : QWidget(parent) {
  auto* pixmap = new QPixmap(":gpgfrontend-logo.png");
  auto* text = new QString(
      "<center><h2>" + qApp->applicationName() + "</h2></center>" +
      "<center><b>" + qApp->applicationVersion() + "</b></center>" +
      "<center>" + GIT_VERSION + "</center>" + "<br><center>" +
      _("GpgFrontend is an easy-to-use, compact, cross-platform, "
        "and installation-free GnuPG Frontend."
        "It visualizes most of the common operations of GnuPG."
        "GpgFrontend is licensed under the GPLv3") +
      "<br><br>"
      "<b>" +
      _("Developer:") + "</b><br>" + "Saturneric" + "<br><br>" +
      _("If you have any questions or suggestions, raise an issue at") +
      "<br/>"
      " <a href=\"https://github.com/saturneric/GpgFrontend\">GitHub</a> " +
      _("or send a mail to my mailing list at") + " <a " +
      "href=\"mailto:eric@bktus.com\">eric@bktus.com</a>." + "<br><br> " +
      _("Built with Qt") + " " + qVersion() + ", " + OPENSSL_VERSION_TEXT +
      " " + _("and") + " " + "GPGME" + " " +
      GpgFrontend::GpgContext::GetInstance()
          .GetInfo(false)
          .GpgMEVersion.c_str() +
      "<br>" + _("Built at") + " " + BUILD_TIMESTAMP + "</center>");

  auto* layout = new QGridLayout();
  auto* pixmapLabel = new QLabel();
  pixmapLabel->setPixmap(*pixmap);
  layout->addWidget(pixmapLabel, 0, 0, 1, -1, Qt::AlignCenter);
  auto* aboutLabel = new QLabel();
  aboutLabel->setText(*text);
  aboutLabel->setWordWrap(true);
  aboutLabel->setOpenExternalLinks(true);
  layout->addWidget(aboutLabel, 1, 0, 1, -1);
  layout->addItem(
      new QSpacerItem(20, 10, QSizePolicy::Minimum, QSizePolicy::Fixed), 2, 1,
      1, 1);

  setLayout(layout);
}

TranslatorsTab::TranslatorsTab(QWidget* parent) : QWidget(parent) {
  QFile translators_qfile;
  auto translators_file =
      GlobalSettingStation::GetInstance().GetResourceDir() / "TRANSLATORS";
  translators_qfile.setFileName(translators_file.u8string().c_str());
#ifdef LINUX
  if (!translators_qfile.exists()) {
    translators_qfile.setFileName("/usr/local/share/GpgFrontend/TRANSLATORS");
  }
#endif

  translators_qfile.open(QIODevice::ReadOnly);
  QByteArray in_buffer = translators_qfile.readAll();

  auto* label = new QLabel(in_buffer);

  auto* main_layout = new QVBoxLayout(this);
  main_layout->addWidget(label);
  main_layout->addStretch();

  auto notice_label = new QLabel(
      _("If you think there are any problems with the translation, why not "
        "participate in the translation work? If you want to participate, "
        "please "
        "read the document or contact me via email."),
      this);
  notice_label->setWordWrap(true);
  main_layout->addWidget(notice_label);

  setLayout(main_layout);
}

UpdateTab::UpdateTab(QWidget* parent) : QWidget(parent) {
  auto* pixmap = new QPixmap(":gpgfrontend-logo.png");
  auto* layout = new QGridLayout();
  auto* pixmap_label = new QLabel();
  pixmap_label->setPixmap(*pixmap);
  layout->addWidget(pixmap_label, 0, 0, 1, -1, Qt::AlignCenter);

  current_version_ = "v" + QString::number(VERSION_MAJOR) + "." +
                     QString::number(VERSION_MINOR) + "." +
                     QString::number(VERSION_PATCH);

  auto tips_label = new QLabel();
  tips_label->setText(
      "<center>" +
      QString(_("It is recommended that you always check the version "
                "of GpgFrontend and upgrade to the latest version.")) +
      "</center><center>" +
      _("New versions not only represent new features, but "
        "also often represent functional and security fixes.") +
      "</center>");
  tips_label->setWordWrap(true);

  current_version_label_ = new QLabel();
  current_version_label_->setText("<center>" + QString(_("Current Version")) +
                                  _(": ") + "<b>" + current_version_ +
                                  "</b></center>");
  current_version_label_->setWordWrap(true);

  latest_version_label_ = new QLabel();
  latest_version_label_->setWordWrap(true);

  upgrade_label_ = new QLabel();
  upgrade_label_->setWordWrap(true);
  upgrade_label_->setOpenExternalLinks(true);
  upgrade_label_->setHidden(true);

  pb_ = new QProgressBar();
  pb_->setRange(0, 0);
  pb_->setTextVisible(false);

  layout->addWidget(tips_label, 1, 0, 1, -1);
  layout->addWidget(current_version_label_, 2, 0, 1, -1);
  layout->addWidget(latest_version_label_, 3, 0, 1, -1);
  layout->addWidget(upgrade_label_, 4, 0, 1, -1);
  layout->addWidget(pb_, 5, 0, 1, -1);
  layout->addItem(
      new QSpacerItem(20, 10, QSizePolicy::Minimum, QSizePolicy::Fixed), 2, 1,
      1, 1);

  setLayout(layout);
}

void UpdateTab::getLatestVersion() {
  this->pb_->setHidden(false);

  SPDLOG_DEBUG("try to get latest version");

  auto* version_task = new VersionCheckTask();

  connect(version_task, &VersionCheckTask::SignalUpgradeVersion, this,
          &UpdateTab::slot_show_version_status);

  Thread::TaskRunnerGetter::GetInstance()
      .GetTaskRunner(Thread::TaskRunnerGetter::kTaskRunnerType_Network)
      ->PostTask(version_task);
}

void UpdateTab::slot_show_version_status(const SoftwareVersion& version) {
  this->pb_->setHidden(true);
  latest_version_label_->setText(
      "<center><b>" + QString(_("Latest Version From Github")) + ": " +
      version.latest_version.c_str() + "</b></center>");

  if (version.NeedUpgrade()) {
    upgrade_label_->setText(
        "<center>" +
        QString(_("The current version is less than the latest version on "
                  "github.")) +
        "</center><center>" + _("Please click") +
        " <a "
        "href=\"https://www.gpgfrontend.bktus.com/#/downloads\">" +
        _("Here") + "</a> " + _("to download the latest stable version.") +
        "</center>");
    upgrade_label_->show();
  } else if (version.VersionWithDrawn()) {
    upgrade_label_->setText(
        "<center>" +
        QString(_("This version has serious problems and has been withdrawn. "
                  "Please stop using it immediately.")) +
        "</center><center>" + _("Please click") +
        " <a "
        "href=\"https://github.com/saturneric/GpgFrontend/releases\">" +
        _("Here") + "</a> " + _("to download the latest stable version.") +
        "</center>");
    upgrade_label_->show();
  } else if (!version.CurrentVersionReleased()) {
    upgrade_label_->setText(
        "<center>" +
        QString(_("This version has not been released yet, it may be a beta "
                  "version. If you are not a tester and care about version "
                  "stability, please do not use this version.")) +
        "</center><center>" + _("Please click") +
        " <a "
        "href=\"https://www.gpgfrontend.bktus.com/#/downloads\">" +
        _("Here") + "</a> " + _("to download the latest stable version.") +
        "</center>");
    upgrade_label_->show();
  }
}

}  // namespace GpgFrontend::UI
