/**
  * @RDE_HEADER@
  * HMI Plugin for Observer Controller - PDF Folder Content
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Steve Kemayou, SLSE, 2022-07-07
  */


#include "osc_edit_folder_content.h"
#include "ui_osc_edit_folder_content.h"
#include <QDir>
#include <QTableView>
#include <LtsUtilsSettings/settings.h>
#include <LtsDataView/lts_data_view.h>
#include <LtsSession/lts_session_data.h>

namespace OcSituationClient
{
static Poppler::Page::Rotation getRotationFromValue(int rotation);

/*!
 * \brief FolderContentEditDialog::FolderContentEditDialog
 * \param parent
 */
FolderContentEditDialog::FolderContentEditDialog(QWidget *parent)
  :LtsWidgets::LtsDialog(parent, LtsWidgets::ButtonCombination::CloseOnly)
  , m_ui(new Ui::FolderContentEditDialog)
  , m_session(nullptr)
  , m_obdFtc(nullptr)
  , m_requestHelper(new LtsUtils::RequestHelper(this))
  , m_logger(getLogger("OscFolderContentEditDialog"))
{
  m_ui->setupUi(this);
  setOnlineHelpFilename(QStringLiteral("OSC-Edit_Folder_Content"));
  m_ui->filesView->horizontalHeader()->setStretchLastSection(true);
  m_ui->filesView->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents); // resize view table to have the same column width
  m_ui->filesView->setSelectionBehavior(QAbstractItemView::SelectRows);
  m_ui->filesView->setEditTriggers(QAbstractItemView::NoEditTriggers); // can't be edited from user.
  m_ui->filesView->verticalHeader()->hide();

  m_buttonBox->connectButton(LtsWidgets::DialogButton::Remove,   this, &FolderContentEditDialog::onDeleteFile);
  m_buttonBox->connectButton(LtsWidgets::DialogButton::Show,     this, &FolderContentEditDialog::onPreviewFile);

  enaDisa();
  const QString opName = LtsSessionData::LtsSessionData::getInstance()->getOperatorName();
  const QString dir = QStringLiteral("%1/OcPdf/%2/").arg(QDir::tempPath()).arg(opName);
  QDir directory(dir);
  if(!directory.exists())
    directory.mkdir(dir);
  setDefaultFileSystemPath(dir);
}

FolderContentEditDialog::~FolderContentEditDialog()
{
  if(m_pdfWidget != nullptr)
    delete m_pdfWidget;
  m_pdfWidget = nullptr;

  delete m_ui;
}

/*!
 * \brief FolderContentEditDialog::init
 * \param session
 * \return
 */
bool FolderContentEditDialog::init(LtsSession::LtsSessionDataDds *session)
{
  m_session = session;
  if (!m_session->getFtc<OcBaseDownload::DataInterface>(m_obdFtc))
  {
    ERROR_LOG(m_logger) << "Cant get Obd FTC can't download";
    return false;
  }

  delete m_fileSystemModel;
  m_fileSystemModel = new QFileSystemModel();
  m_fileSystemModel->setFilter(QDir::Files|QDir::NoDotAndDotDot);
  m_fileSystemModel->setReadOnly(true);
  QStringList filters;
  filters << QStringLiteral("*.pdf");
  m_fileSystemModel->setNameFilters(filters);
  m_fileSystemModel->setNameFilterDisables(false);
  m_fileSystemModel->setReadOnly(true);
  m_ui->filesView->setModel(m_fileSystemModel);
  m_ui->filesView->setRootIndex(m_fileSystemModel->setRootPath(getFileSysPath()));
  m_ui->filesView->hideColumn(1);
  m_fileSystemModel->sort(3, Qt::DescendingOrder);

  m_ui->filesView->horizontalHeader()->setStyleSheet(QStringLiteral("font-weight: bold;"));
  connect(m_ui->filesView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &FolderContentEditDialog::onSelectionChanged);

  QPushButton *btn = m_buttonBox->getButton(LtsWidgets::DialogButton::Save);
  btn->setText(tr("Pdf Download"));
  m_buttonBox->connectButton(LtsWidgets::DialogButton::Save, this, &FolderContentEditDialog::onOcPdfDownloadClicked);

  initPdfWidow();
  return true;
}

/*!
 * \brief FolderContentEditDialog::retranslate
 */
void FolderContentEditDialog::retranslate()
{
  translate(m_ui, tr("Folder Content"));
}

/*!
 * \brief FolderContentEditDialog::enaDisa
 */
void FolderContentEditDialog::enaDisa()
{
  m_buttonBox->setButtonEnabled(LtsWidgets::DialogButton::Remove, false);
  m_buttonBox->setButtonEnabled(LtsWidgets::DialogButton::Show, false);
  QItemSelectionModel *select = m_ui->filesView->selectionModel();
  if(select == nullptr)
    return;
  QModelIndexList indexList =select->selectedRows();
  if(indexList.size() == 0)
    return;
  m_buttonBox->setButtonEnabled(LtsWidgets::DialogButton::Remove, indexList.size() > 0);
  m_buttonBox->setButtonEnabled(LtsWidgets::DialogButton::Show,   indexList.size()==1);
}

/*!
 * \brief FolderContentEditDialog::onSelectionChanged
 */
void FolderContentEditDialog::onSelectionChanged()
{
  enaDisa();
}

void FolderContentEditDialog::onOcPdfDownloadClicked()
{
  LtsUtils::ProjectSettings *ps = LtsUtils::ProjectSettings::getInstance();
  const int folderId = ps->value(QStringLiteral("obd"), QStringLiteral("ocPdfDownloadFolderId")).toInt();
  if(folderId <= 0)
  {
    LtsWidgets::LtsMessageDialog::showMessage(this, tr("Couldn't download pdf files: Folder id invalid!"));
    return;
  }
  const QString matrixOperator = LtsSessionData::LtsSessionData::getInstance()->getOperatorName();

  DEBUG_LOG(m_logger)<<LOGFUNCTION<<" folderId:" <<folderId<<" operatorName: "<<matrixOperator;
  OcBaseDownload::OcPdfDownloadRequest req(folderId,matrixOperator.toStdString());
  m_requestHelper->startSingleRequest([req, this]()
  {
    return m_obdFtc->ocPdfDownloadRequest(req, this);
  });

}

/*!
 * \brief FolderContentEditDialog::onPreviewFile
 */
void FolderContentEditDialog::onPreviewFile()
{
  QItemSelectionModel *select = m_ui->filesView->selectionModel();
  if(select == nullptr)
    return;

  QModelIndexList indexList =select->selectedRows();
  if(indexList.size() == 0)
    return;

  QModelIndex index = indexList.at(0);
  m_currViewPath = m_fileSystemModel->filePath(index);
  //const QUrl url = QUrl(QStringLiteral("file://") + m_currViewPath);

  if(m_pdfWidget == nullptr)
  {
    WARNING_LOG(m_logger)<<" pdf widget not initialized. trying to init...";
    initPdfWidow();
  }
  QFile f(m_currViewPath);
  if(f.open(QIODevice::ReadOnly))
  {
    DEBUG_LOG(m_logger) << "Current File: " << m_currViewPath;
    setPage(1);
    setZoomFactor(ZOOM_DEFAULT);
    setRotation(Poppler::Page::Rotate0);
    m_pdfWidget->setWindowTitle(m_fileSystemModel->fileName(index));
    m_pdfWidget->showPDF(f.readAll());
    m_pdfWidget->setVisible(true);
    m_pdfWidget->showMaximized();
  }
}

/*!
 * \brief FolderContentEditDialog::onDeleteFile
 */
void FolderContentEditDialog::onDeleteFile()
{
  TRACE_LOG(m_logger)<<" delete file START ";
  QItemSelectionModel *select = m_ui->filesView->selectionModel();
  if(select == nullptr)
    return;
  QModelIndexList indexList =select->selectedRows();
  m_pdfWidget->hide();
  if(indexList.size() > 0)
  {
    QFileInfoList fileInfoList;
    for(const auto index : qAsConst(indexList))
    {
      fileInfoList << m_fileSystemModel->fileInfo(index);
      TRACE_LOG(m_logger)<< "file path:"<<fileInfoList.last().absoluteFilePath();
    }

    QDir dir;
    dir.setPath(getFileSysPath());
    for (auto fileInfo : fileInfoList)
    {
      bool success = dir.remove(fileInfo.fileName());
      TRACE_LOG(m_logger)<< "remove file:"<<fileInfo.absoluteFilePath() << " | succeed? "<< success;
    }
  }

  TRACE_LOG(m_logger) <<" delete file End ";

}

/*!
 * \brief FolderContentEditDialog::setDefaultFileSystemPath
 * \param path
 */
void FolderContentEditDialog::setDefaultFileSystemPath(QString path)
{
  m_filesysPath = path.isEmpty() ? QDir::homePath() : path;
  TRACE_LOG(m_logger)<<" set default filesystem path: "<< path;
}

/*!
 * \brief FolderContentEditDialog::setPage
 * \param pageNo
 */
void FolderContentEditDialog::setPage(int pageNo)
{
  if (m_pageNo == pageNo)
    return;
  DEBUG_LOG(m_logger) << "setPage = " << pageNo;
  m_pageNo = pageNo;
  m_pdfWidget->setPage(pageNo);
  emit currentPageChanged(m_pageNo);
}

/*!
 * \brief FolderContentEditDialog::getCurPage
 * \return
 */
int FolderContentEditDialog::getCurPage() const
{
  return m_pdfWidget->curPage();
}

/*!
 * \brief FolderContentEditDialog::getNumPages
 * \return
 */
int FolderContentEditDialog::getNumPages() const
{
  return m_pdfWidget->numPages();
}

/*!
 * \brief FolderContentEditDialog::setZoomFactor
 * \param zoomFactor
 */
void FolderContentEditDialog::setZoomFactor(double zoomFactor)
{
  if (qFuzzyCompare(m_zoomFactor, zoomFactor))
    return;
  DEBUG_LOG(m_logger) << "setZoomFactor = " << zoomFactor;
  m_zoomFactor = zoomFactor;
  m_pdfWidget->setZoomFactor(zoomFactor);
}

/*!
 * \brief FolderContentEditDialog::setRotation
 * \param rotation
 */
void FolderContentEditDialog::setRotation(int rotation)
{
  if (m_rotation == rotation)
    return;
  DEBUG_LOG(m_logger) << "setRotation = " << rotation;
  m_rotation = rotation;
  m_pdfWidget->setRotation(getRotationFromValue(m_rotation));
  emit rotationChanged(rotation);
}

/*!
 * \brief FolderContentEditDialog::initPdfWidow
 */
void FolderContentEditDialog::initPdfWidow()
{
  if(m_pdfWidget!= nullptr)
    delete m_pdfWidget;

  m_pdfWidget = new NGL::PDFWidget();
  m_pdfWidget->setObjectName(QStringLiteral("osc_pdfWidget"));
  m_pdfWidget->setSizePolicy(QSizePolicy::Policy::MinimumExpanding, QSizePolicy::Policy::MinimumExpanding);
  m_pdfWidget->setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
  connect(m_pdfWidget, &NGL::PDFWidget::currentPageChanged, this, &FolderContentEditDialog::setPage);
  connect(m_pdfWidget, &NGL::PDFWidget::rotationChanged, this, [this](Poppler::Page::Rotation rot)
  {
    switch (rot)
    {
    case Poppler::Page::Rotate90:
      setRotation(90);
      break;
    case Poppler::Page::Rotate180:
      setRotation(180);
      break;
    case Poppler::Page::Rotate270:
      setRotation(270);
      break;
    case Poppler::Page::Rotate0:
      setRotation(0);
      break;
    }
  });
}

void FolderContentEditDialog::onOcPdfDownloadReply(const Core::FunctionReplyObject & replyObject)
{
  m_requestHelper->requestReply(replyObject); 
  m_fileSystemModel->setRootPath(getFileSysPath());
}

/*!
 * \brief getRotationFromValue
 * \param rotation
 * \return
 */
Poppler::Page::Rotation getRotationFromValue(int rotation)
{
  Poppler::Page::Rotation rot;
  switch (rotation)
  {
  case 90:
    rot = Poppler::Page::Rotate90;
    break;
  case 180:
    rot = Poppler::Page::Rotate180;
    break;
  case 270:
    rot = Poppler::Page::Rotate270;
    break;
  case 0:
  default:
    rot = Poppler::Page::Rotate0;
    break;
  }
  return rot;
}


} // end namespace