/*
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 "transfersavesdialog.h"

#include "ui_transfersavesdialog.h"
#include "iplugingame.h"
#include "isavegame.h"
#include "savegameinfo.h"

#include <QtDebug>
#include <QDateTime>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QFlags>
#include <QLabel>
#include <QListWidget>
#include <QListWidgetItem>
#include <QMessageBox>
#include <QPushButton>
#include <QStringList>

using namespace MOBase;
using namespace MOShared;

//These two classes give the save-transfer box a smidgin of useful info even
//if save game isn't supported yet.
namespace {

class DummySave : public ISaveGame
{
public:
  DummySave(QString const &filename) :
    m_File(filename)
  {}

  ~DummySave() {}

  virtual QString getFilename() const override
  {
    return m_File;
  }

  virtual QDateTime getCreationTime() const override
  {
    return QFileInfo(m_File).created();
  }

  virtual QString getSaveGroupIdentifier() const override
  {
    return m_File;
  }

  virtual QStringList allFiles() const override
  {
    return { m_File };
  }

private:
  QString m_File;
};

class DummyInfo : public SaveGameInfo
{
public:
  virtual MOBase::ISaveGame const *getSaveGameInfo(QString const &file) const override
  {
    return new DummySave(file);
  }

  virtual MissingAssets getMissingAssets(QString const &) const override
  {
    return {};
  }

  MOBase::ISaveGameInfoWidget *getSaveGameWidget(QWidget *) const override
  {
    return nullptr;
  }
};

} //end anonymous namespace

TransferSavesDialog::TransferSavesDialog(const Profile &profile, IPluginGame const *gamePlugin, QWidget *parent)
  : TutorableDialog("TransferSaves", parent)
  , ui(new Ui::TransferSavesDialog)
  , m_Profile(profile)
  , m_GamePlugin(gamePlugin)
{
  ui->setupUi(this);
  ui->label_2->setText(tr("Characters for profile %1").arg(m_Profile.name()));
  refreshGlobalSaves();
  refreshLocalSaves();
  refreshGlobalCharacters();
  refreshLocalCharacters();
}

TransferSavesDialog::~TransferSavesDialog()
{
  delete ui;
}

void TransferSavesDialog::refreshGlobalSaves()
{
  refreshSaves(m_GlobalSaves, m_GamePlugin->savesDirectory().absolutePath());
}


void TransferSavesDialog::refreshLocalSaves()
{
  refreshSaves(m_LocalSaves, m_Profile.savePath());
}


void TransferSavesDialog::refreshGlobalCharacters()
{
  refreshCharacters(m_GlobalSaves, ui->globalCharacterList, ui->copyToLocalBtn, ui->moveToLocalBtn);
}


void TransferSavesDialog::refreshLocalCharacters()
{
  refreshCharacters(m_LocalSaves, ui->localCharacterList, ui->copyToGlobalBtn, ui->moveToGlobalBtn);
}


bool TransferSavesDialog::testOverwrite(OverwriteMode &overwriteMode, const QString &destinationFile)
{
  QMessageBox::StandardButton res = overwriteMode == OVERWRITE_YES ? QMessageBox::Yes : QMessageBox::No;
  if (overwriteMode == OVERWRITE_ASK) {
    res = QMessageBox::question(this, tr("Overwrite"),
                                tr("Overwrite the file \"%1\"").arg(destinationFile),
                                QMessageBox::Yes | QMessageBox::No | QMessageBox::YesToAll | QMessageBox::NoToAll);
    if (res == QMessageBox::YesToAll) {
      overwriteMode = OVERWRITE_YES;
      res = QMessageBox::Yes;
    } else if (res == QMessageBox::NoToAll) {
      overwriteMode = OVERWRITE_NO;
      res = QMessageBox::No;
    }
  }
  return res == QMessageBox::Yes;
}

#define MOVE_SAVES  "Move all save games of character \"%1\""
#define COPY_SAVES  "Copy all save games of character \"%1\""

#define TO_PROFILE "to the profile?"
#define TO_GLOBAL  "to the global location? Please be aware that this will mess up the running number of save games."

void TransferSavesDialog::on_moveToLocalBtn_clicked()
{
  QString character = ui->globalCharacterList->currentItem()->text();
  if (transferCharacters(character,
                         MOVE_SAVES TO_PROFILE,
                         m_GlobalSaves[character],
                         m_Profile.savePath(),
                         QFile::rename,
                         "Failed to move %s to %s"))
  {
    refreshGlobalSaves();
    refreshGlobalCharacters();
    refreshLocalSaves();
    refreshLocalCharacters();
  }
}

void TransferSavesDialog::on_copyToLocalBtn_clicked()
{
  QString character = ui->globalCharacterList->currentItem()->text();
  if (transferCharacters(character,
                         COPY_SAVES TO_PROFILE,
                         m_GlobalSaves[character],
                         m_Profile.savePath(),
                         QFile::copy,
                         "Failed to copy %s to %s")) {
    refreshLocalSaves();
    refreshLocalCharacters();
  }
}

void TransferSavesDialog::on_moveToGlobalBtn_clicked()
{
  QString character = ui->localCharacterList->currentItem()->text();
  if (transferCharacters(character,
                         MOVE_SAVES TO_GLOBAL,
                         m_LocalSaves[character],
                         m_GamePlugin->savesDirectory().absolutePath(),
                         QFile::rename,
                         "Failed to move %s to %s")) {
    refreshGlobalSaves();
    refreshGlobalCharacters();
    refreshLocalSaves();
    refreshLocalCharacters();
  }
}

void TransferSavesDialog::on_copyToGlobalBtn_clicked()
{
  QString character = ui->localCharacterList->currentItem()->text();
  if (transferCharacters(character,
                         COPY_SAVES TO_GLOBAL,
                         m_LocalSaves[character],
                         m_GamePlugin->savesDirectory().absolutePath(),
                         QFile::copy,
                         "Failed to copy %s to %s")) {
    refreshGlobalSaves();
    refreshGlobalCharacters();
  }
}

void TransferSavesDialog::on_doneButton_clicked()
{
  close();
}

void TransferSavesDialog::on_globalCharacterList_currentTextChanged(const QString &currentText)
{
  ui->globalSavesList->clear();
  //sadly this can get called while we're resetting the list, with an invalid
  //name, so we have to check.
  SaveCollection::const_iterator saveList = m_GlobalSaves.find(currentText);
  if (saveList != m_GlobalSaves.end()) {
    for (SaveListItem const &save : saveList->second) {
      ui->globalSavesList->addItem(QFileInfo(save->getFilename()).fileName());
    }
  }
}

void TransferSavesDialog::on_localCharacterList_currentTextChanged(const QString &currentText)
{
  ui->localSavesList->clear();
  //sadly this can get called while we're resetting the list, with an invalid
  //name, so we have to check.
  SaveCollection::const_iterator saveList = m_LocalSaves.find(currentText);
  if (saveList != m_LocalSaves.end()) {
    for (SaveListItem const &save : saveList->second) {
      ui->localSavesList->addItem(QFileInfo(save->getFilename()).fileName());
    }
  }
}

void TransferSavesDialog::refreshSaves(SaveCollection &saveCollection, QString const &savedir)
{
  saveCollection.clear();
  QDir savesDir(savedir);
  savesDir.setNameFilters(QStringList() << QString("*.%1").arg(m_GamePlugin->savegameExtension()));

  SaveGameInfo const *info = m_GamePlugin->feature<SaveGameInfo>();
  if (info == nullptr) {
    static DummyInfo dummyInfo;
    info = &dummyInfo;
  }

  QStringList files = savesDir.entryList(QDir::Files, QDir::Time);
  for (const QString &filename : files) {
    QString file = savesDir.absoluteFilePath(filename);
    MOBase::ISaveGame const *save = info->getSaveGameInfo(file);
    saveCollection[save->getSaveGroupIdentifier()].push_back(
                                std::unique_ptr<MOBase::ISaveGame const>(save));
  }
}

void TransferSavesDialog::refreshCharacters(const SaveCollection &saveCollection,
                    QListWidget *charList, QPushButton *copy, QPushButton *move)
{
  charList->clear();
  for (SaveCollection::value_type const &val : saveCollection) {
    charList->addItem(val.first);
  }
  if (charList->count() > 0) {
    charList->setCurrentRow(0);
    copy->setEnabled(true);
    move->setEnabled(true);
  } else {
    copy->setEnabled(false);
    move->setEnabled(false);
  }
}

bool TransferSavesDialog::transferCharacters(QString const &character,
                                             char const *message,
                                             SaveList &saves,
                                             QString const &dest,
                                             bool (method)(QString const &, QString const &),
                                             char const *errmsg)
{
  if (QMessageBox::question(this, tr("Confirm"),
        tr(message).arg(character),
        QMessageBox::Yes | QMessageBox::No) != QMessageBox::Yes) {
      return false;
  }

  OverwriteMode overwriteMode = OVERWRITE_ASK;

  QDir destination(dest);
  for (SaveListItem const &save : saves) {
    for (QString source : save->allFiles()) {
      QFileInfo sourceFile(source);
      QString destinationFile(destination.absoluteFilePath(sourceFile.fileName()));

      //If the file is already there, let them skip (or not).
      if (QFile::exists(destinationFile)) {
        if (! testOverwrite(overwriteMode, destinationFile)) {
          continue;
        }
        //OK, they want to remove it.
        QFile::remove(destinationFile);
      }

      if (! method(sourceFile.absoluteFilePath(), destinationFile)) {
        qCritical(errmsg,
                  sourceFile.absoluteFilePath().toUtf8().constData(),
                  destinationFile.toUtf8().constData());
      }
    }
  }
  return true;
}