/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.

This file is part of Mod Organizer.

Mod Organizer 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.

Mod Organizer 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 Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "modinfodialog.h"
#include "ui_modinfodialog.h"
#include "plugincontainer.h"
#include "organizercore.h"
#include "mainwindow.h"
#include "modinfodialogtextfiles.h"
#include "modinfodialogimages.h"
#include "modinfodialogesps.h"
#include "modinfodialogconflicts.h"
#include "modinfodialogcategories.h"
#include "modinfodialognexus.h"
#include "modinfodialogfiletree.h"

using namespace MOBase;
using namespace MOShared;

const int max_scan_for_context_menu = 50;

bool canPreviewFile(
  PluginContainer& pluginContainer, bool isArchive, const QString& filename)
{
  if (isArchive) {
    return false;
  }

  const auto ext = QFileInfo(filename).suffix();
  return pluginContainer.previewGenerator().previewSupported(ext);
}

bool canOpenFile(bool isArchive, const QString&)
{
  // can open anything as long as it's not in an archive
  return !isArchive;
}

bool canHideFile(bool isArchive, const QString& filename)
{
  if (isArchive) {
    // can't hide files from archives
    return false;
  }

  if (filename.endsWith(ModInfo::s_HiddenExt)) {
    // already hidden
    return false;
  }

  return true;
}

bool canUnhideFile(bool isArchive, const QString& filename)
{
  if (isArchive) {
    // can't unhide files from archives
    return false;
  }

  if (!filename.endsWith(ModInfo::s_HiddenExt)) {
    // already visible
    return false;
  }

  return true;
}

FileRenamer::RenameResults hideFile(FileRenamer& renamer, const QString &oldName)
{
  const QString newName = oldName + ModInfo::s_HiddenExt;
  return renamer.rename(oldName, newName);
}

FileRenamer::RenameResults unhideFile(FileRenamer& renamer, const QString &oldName)
{
  QString newName = oldName.left(oldName.length() - ModInfo::s_HiddenExt.length());
  return renamer.rename(oldName, newName);
}


ModInfoDialog::TabInfo::TabInfo(std::unique_ptr<ModInfoDialogTab> tab)
  : tab(std::move(tab)), realPos(-1), widget(nullptr)
{
}

ModInfoDialog::ModInfoDialog(
  MainWindow* mw, OrganizerCore* core, PluginContainer* plugin) :
    TutorableDialog("ModInfoDialog", mw),
    ui(new Ui::ModInfoDialog), m_mainWindow(mw),
    m_core(core), m_plugin(plugin), m_initialTab(-1)
{
  ui->setupUi(this);

  auto* sc = new QShortcut(QKeySequence::Delete, this);
  connect(sc, &QShortcut::activated, [&]{ onDeleteShortcut(); });

  m_tabs = createTabs();

  for (int i=0; i<ui->tabWidget->count(); ++i) {
    if (static_cast<std::size_t>(i) >= m_tabs.size()) {
      qCritical() << "mod info dialog has more tabs than expected";
      break;
    }

    auto& tabInfo = m_tabs[static_cast<std::size_t>(i)];
    tabInfo.widget = ui->tabWidget->widget(i);
    tabInfo.caption = ui->tabWidget->tabText(i);
    tabInfo.icon = ui->tabWidget->tabIcon(i);
    tabInfo.realPos = i;

    connect(
      tabInfo.tab.get(), &ModInfoDialogTab::originModified,
      [&](int originID){ emit originModified(originID); });

    connect(
      tabInfo.tab.get(), &ModInfoDialogTab::modOpen,
      [&](const QString& name){
        setMod(name);
        update();
      });
  }
}

ModInfoDialog::~ModInfoDialog() = default;

std::vector<ModInfoDialog::TabInfo> ModInfoDialog::createTabs()
{
  std::vector<TabInfo> v;

  v.push_back(createTab<TextFilesTab>(TAB_TEXTFILES));
  v.push_back(createTab<IniFilesTab>(TAB_INIFILES));
  v.push_back(createTab<ImagesTab>(TAB_IMAGES));
  v.push_back(createTab<ESPsTab>(TAB_ESPS));
  v.push_back(createTab<ConflictsTab>(TAB_CONFLICTS));
  v.push_back(createTab<CategoriesTab>(TAB_CATEGORIES));
  v.push_back(createTab<NexusTab>(TAB_NEXUS));
  v.push_back(createTab<NotesTab>(TAB_NOTES));
  v.push_back(createTab<FileTreeTab>(TAB_FILETREE));

  return v;
}

int ModInfoDialog::exec()
{
  update();
  return TutorableDialog::exec();
}

void ModInfoDialog::setMod(ModInfo::Ptr mod)
{
  m_mod = mod;
}

void ModInfoDialog::setMod(const QString& name)
{
  unsigned int index = ModInfo::getIndex(name);
  if (index == UINT_MAX) {
    qCritical() << "failed to resolve mod name " << name;
    return;
  }

  auto mod = ModInfo::getByIndex(index);
  if (!mod) {
    qCritical() << "mod by index " << index << " is null";
    return;
  }

  setMod(mod);
}

void ModInfoDialog::setTab(int index)
{
  if (!isVisible()) {
    m_initialTab = index;
    return;
  }

  switchToTab(index);
}

void ModInfoDialog::update()
{
  setWindowTitle(m_mod->name());
  setTabsVisibility();
  updateTabs();
  feedFiles();
  setTabsColors();

  if (m_initialTab >= 0) {
    switchToTab(m_initialTab);
    m_initialTab = -1;
  }
}

void ModInfoDialog::setTabsVisibility()
{
  std::vector<bool> visibility(m_tabs.size());
  bool changed = false;

  for (std::size_t i=0; i<m_tabs.size(); ++i) {
    const auto& tabInfo = m_tabs[i];

    bool visible = true;

    if (m_mod->hasFlag(ModInfo::FLAG_FOREIGN)) {
      visible = tabInfo.tab->canHandleUnmanaged();
    } else if (m_mod->hasFlag(ModInfo::FLAG_SEPARATOR)) {
      visible = tabInfo.tab->canHandleSeparators();
    }

    const auto currentlyVisible = (ui->tabWidget->indexOf(tabInfo.widget) != -1);

    if (visible != currentlyVisible) {
      changed = true;
    }

    visibility[i] = visible;
  }

  if (!changed) {
    return;
  }

  // remember selection
  const int sel = ui->tabWidget->currentIndex();

  // remove all tabs
  ui->tabWidget->clear();

  // add visible tabs
  for (std::size_t i=0; i<visibility.size(); ++i) {
    if (visibility[i]) {
      ui->tabWidget->addTab(m_tabs[i].widget, m_tabs[i].icon, m_tabs[i].caption);

      if (static_cast<int>(i) == sel) {
        ui->tabWidget->setCurrentIndex(static_cast<int>(i));
      }
    }
  }
}

void ModInfoDialog::updateTabs()
{
  auto* origin = getOrigin();

  for (auto& tabInfo : m_tabs) {
    tabInfo.tab->setMod(m_mod, origin);
    tabInfo.tab->clear();
    tabInfo.tab->update();
  }
}

void ModInfoDialog::feedFiles()
{
  const auto rootPath = m_mod->absolutePath();

  if (rootPath.length() > 0) {
    QDirIterator dirIterator(rootPath, QDir::Files, QDirIterator::Subdirectories);
    while (dirIterator.hasNext()) {
      QString fileName = dirIterator.next();

      for (auto& tabInfo : m_tabs) {
        if (tabInfo.tab->feedFile(rootPath, fileName)) {
          break;
        }
      }
    }
  }
}

void ModInfoDialog::setTabsColors()
{
  for (const auto& tabInfo : m_tabs) {
    const auto c = tabInfo.tab->hasData() ?
      QColor::Invalid :
      ui->tabWidget->palette().color(QPalette::Disabled, QPalette::WindowText);

    ui->tabWidget->tabBar()->setTabTextColor(tabInfo.realPos, c);
  }
}

void ModInfoDialog::switchToTab(std::size_t index)
{
  if (index >= m_tabs.size()) {
    qCritical() << "tab index " << index << "out of range";
    return;
  }

  if (ui->tabWidget->indexOf(m_tabs[index].widget) == -1) {
    qCritical() << "can't switch to tab " << index << ", not available";
    return;
  }

  ui->tabWidget->setCurrentIndex(m_tabs[index].realPos);
}

MOShared::FilesOrigin* ModInfoDialog::getOrigin()
{
  MOShared::FilesOrigin* origin = nullptr;

  auto* ds = m_core->directoryStructure();
  if (ds->originExists(ToWString(m_mod->name()))) {
    auto* origin = &ds->getOriginByName(ToWString(m_mod->name()));
    if (!origin->isDisabled()) {
      return origin;
    }
  }

  return nullptr;
}

void ModInfoDialog::saveState(Settings& s) const
{
  //s.directInterface().setValue("mod_info_tabs", saveTabState());

  for (const auto& tabInfo : m_tabs) {
    tabInfo.tab->saveState(s);
  }
}

void ModInfoDialog::restoreState(const Settings& s)
{
  //restoreTabState(s.directInterface().value("mod_info_tabs").toByteArray());

  for (const auto& tabInfo : m_tabs) {
    tabInfo.tab->restoreState(s);
  }
}

QByteArray ModInfoDialog::saveTabState() const
{
  QByteArray result;
  /*QDataStream stream(&result, QIODevice::WriteOnly);
  stream << ui->tabWidget->count();
  for (int i = 0; i < ui->tabWidget->count(); ++i) {
    stream << ui->tabWidget->widget(i)->objectName();
  }*/

  return result;
}

void ModInfoDialog::restoreTabState(const QByteArray &state)
{
  /*QDataStream stream(state);
  int count = 0;
  stream >> count;

  QStringList tabIds;

  // first, only determine the new mapping
  for (int newPos = 0; newPos < count; ++newPos) {
    QString tabId;
    stream >> tabId;
    tabIds.append(tabId);
    int oldPos = tabIndex(tabId);
    if (oldPos != -1) {
      m_realTabPos[newPos] = oldPos;
    } else {
      m_realTabPos[newPos] = newPos;
    }
  }

  // then actually move the tabs
  QTabBar *tabBar = ui->tabWidget->tabBar();
  ui->tabWidget->blockSignals(true);
  for (int newPos = 0; newPos < count; ++newPos) {
    QString tabId = tabIds.at(newPos);
    int oldPos = tabIndex(tabId);
    tabBar->moveTab(oldPos, newPos);
  }
  ui->tabWidget->blockSignals(false);*/
}

int ModInfoDialog::tabIndex(const QString& tabId)
{
  for (int i = 0; i < ui->tabWidget->count(); ++i) {
    if (ui->tabWidget->widget(i)->objectName() == tabId) {
      return i;
    }
  }
  return -1;
}

void ModInfoDialog::onDeleteShortcut()
{
  for (auto& tabInfo : m_tabs) {
    if (tabInfo.tab->deleteRequested()) {
      break;
    }
  }
}

void ModInfoDialog::on_closeButton_clicked()
{
  for (auto& tabInfo : m_tabs) {
    if (!tabInfo.tab->canClose()) {
      return;
    }
  }

  close();
}

void ModInfoDialog::on_tabWidget_currentChanged(int index)
{
}

void ModInfoDialog::on_nextButton_clicked()
{
  auto mod = m_mainWindow->nextModInList();
  if (mod == m_mod) {
    return;
  }

  setMod(mod);
  update();
}

void ModInfoDialog::on_prevButton_clicked()
{
  auto mod = m_mainWindow->previousModInList();
  if (mod == m_mod) {
    return;
  }

  setMod(mod);
  update();
}