/*

    Copyright (C) 2013  Hong Jen Yee (PCMan) <pcman.tw@gmail.com>

    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "desktoppreferencesdialog.h"
#include "desktopwindow.h"
#include "settings.h"
#include "application.h"
#include "xdgdir.h"
#include <QFileDialog>
#include <QImageReader>
#include <QFile>
#include <QDir>
#include <QSaveFile>
#include <QRegExp>
#include <QDebug>
#include <QStandardPaths>

namespace PCManFM {

static int iconSizes[] = {96, 72, 64, 48, 36, 32, 24, 20};

DesktopPreferencesDialog::DesktopPreferencesDialog(QWidget* parent, Qt::WindowFlags f):
  QDialog(parent, f),
  editDesktopFolderEnabled(false),
  desktopFolderWidget(0),
  desktopFolder() {


  setAttribute(Qt::WA_DeleteOnClose);

  Settings& settings = static_cast<Application*>(qApp)->settings();
  ui.setupUi(this);

  // setup wallpaper modes
  connect(ui.wallpaperMode, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &DesktopPreferencesDialog::onWallpaperModeChanged);
  ui.wallpaperMode->addItem(tr("Fill with background color only"), DesktopWindow::WallpaperNone);
  ui.wallpaperMode->addItem(tr("Stretch to fill the entire screen"), DesktopWindow::WallpaperStretch);
  ui.wallpaperMode->addItem(tr("Stretch to fit the screen"), DesktopWindow::WallpaperFit);
  ui.wallpaperMode->addItem(tr("Center on the screen"), DesktopWindow::WallpaperCenter);
  ui.wallpaperMode->addItem(tr("Tile the image to fill the entire screen"), DesktopWindow::WallpaperTile);
  ui.wallpaperMode->addItem(tr("Zoom the image to fill the entire screen"), DesktopWindow::WallpaperZoom);
  int i;
  switch(settings.wallpaperMode()) {
    case DesktopWindow::WallpaperNone:
      i = 0;
      break;
    case DesktopWindow::WallpaperStretch:
      i = 1;
      break;
    case DesktopWindow::WallpaperFit:
      i = 2;
      break;
    case DesktopWindow::WallpaperCenter:
      i = 3;
      break;
    case DesktopWindow::WallpaperTile:
      i = 4;
      break;
    case DesktopWindow::WallpaperZoom:
      i = 5;
      break;
    default:
      i = 0;
  }
  ui.wallpaperMode->setCurrentIndex(i);

  connect(ui.browse, &QPushButton::clicked, this, &DesktopPreferencesDialog::onBrowseClicked);
  qDebug("wallpaper: %s", settings.wallpaper().toUtf8().data());
  ui.imageFile->setText(settings.wallpaper());

  ui.slideShow->setChecked(settings.slideShowInterval() > 0);
  ui.imageFolder->setText(settings.wallpaperDir());
  int minutes = qMax(settings.slideShowInterval() / 60000, 5); // 5 min at least
  ui.hours->setValue(minutes / 60);
  ui.minutes->setValue(minutes % 60);
  ui.randomize->setChecked(settings.wallpaperRandomize());
  connect(ui.folderBrowse, &QPushButton::clicked, this, &DesktopPreferencesDialog::onFolderBrowseClicked);

  for(std::size_t i = 0; i < G_N_ELEMENTS(iconSizes); ++i) {
    int size = iconSizes[i];
    ui.iconSize->addItem(QString("%1 x %1").arg(size), size);
    if(settings.desktopIconSize() == size)
      ui.iconSize->setCurrentIndex(i);
  }

  ui.font->setFont(settings.desktopFont());

  ui.backgroundColor->setColor(settings.desktopBgColor());
  ui.textColor->setColor(settings.desktopFgColor());
  ui.shadowColor->setColor(settings.desktopShadowColor());
  ui.showWmMenu->setChecked(settings.showWmMenu());

  connect(ui.buttonBox->button(QDialogButtonBox::Apply), &QPushButton::clicked,
          this, &DesktopPreferencesDialog::onApplyClicked);

  ui.hMargin->setValue(settings.desktopCellMargins().width());
  ui.vMargin->setValue(settings.desktopCellMargins().height());
  connect(ui.lockMargins, &QAbstractButton::clicked, this, &DesktopPreferencesDialog::lockMargins);
}

DesktopPreferencesDialog::~DesktopPreferencesDialog() {
}

void DesktopPreferencesDialog::setupDesktopFolderUi()
{
  desktopFolderWidget = new QWidget();
  uiDesktopFolder.setupUi(desktopFolderWidget);
  ui.advancedPageLayout->insertWidget(1, desktopFolderWidget);
  uiDesktopFolder.verticalLayout->setMargin(0);

  desktopFolder = XdgDir::readDesktopDir();
  qDebug("desktop folder: %s", desktopFolder.toStdString().c_str());

  uiDesktopFolder.desktopFolder->setText(desktopFolder);

  connect(uiDesktopFolder.browseDesktopFolder, &QPushButton::clicked,
    this, &DesktopPreferencesDialog::onBrowseDesktopFolderClicked);
}

void DesktopPreferencesDialog::lockMargins(bool lock) {
  ui.vMargin->setDisabled(lock);
  if(lock) {
    ui.vMargin->setValue(ui.hMargin->value());
    connect(ui.hMargin, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), ui.vMargin, &QSpinBox::setValue);
  }
  else
    disconnect(ui.hMargin, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), ui.vMargin, &QSpinBox::setValue);
}

void DesktopPreferencesDialog::applySettings()
{
  Settings& settings = static_cast<Application*>(qApp)->settings();

  if (editDesktopFolderEnabled)
      XdgDir::setDesktopDir(uiDesktopFolder.desktopFolder->text());

  settings.setWallpaper(ui.imageFile->text());
  int mode = ui.wallpaperMode->itemData(ui.wallpaperMode->currentIndex()).toInt();
  settings.setWallpaperMode(mode);

  settings.setWallpaperDir(ui.imageFolder->text());
  int interval = 0;
  if(ui.slideShow->isChecked())
    interval = (ui.minutes->value() + 60 * ui.hours->value()) * 60000;
  settings.setSlideShowInterval(interval);
  settings.setWallpaperRandomize(ui.randomize->isChecked());

  settings.setDesktopIconSize(ui.iconSize->itemData(ui.iconSize->currentIndex()).toInt());

  settings.setDesktopFont(ui.font->font());
  settings.setDesktopBgColor(ui.backgroundColor->color());
  settings.setDesktopFgColor(ui.textColor->color());
  settings.setDesktopShadowColor(ui.shadowColor->color());
  settings.setShowWmMenu(ui.showWmMenu->isChecked());

  settings.setDesktopCellMargins(QSize(ui.hMargin->value(), ui.vMargin->value()));

  settings.save();
}

void DesktopPreferencesDialog::onApplyClicked()
{
  applySettings();
  static_cast<Application*>(qApp)->updateDesktopsFromSettings();
}

void DesktopPreferencesDialog::accept() {
  applySettings();
  static_cast<Application*>(qApp)->updateDesktopsFromSettings(false); // don't change slide wallpaper on clicking OK
  QDialog::accept();
}

void DesktopPreferencesDialog::onWallpaperModeChanged(int index) {
  int mode = ui.wallpaperMode->itemData(index).toInt();

  bool enable = (mode != DesktopWindow::WallpaperNone);
  ui.imageFile->setEnabled(enable);
  ui.browse->setEnabled(enable);
}

void DesktopPreferencesDialog::onBrowseClicked() {
  QFileDialog dlg;
  dlg.setAcceptMode(QFileDialog::AcceptOpen);
  dlg.setFileMode(QFileDialog::ExistingFile);
  // compose a name fileter from QImageReader
  QString filter;
  filter.reserve(256);
  filter = tr("Image Files");
  filter += " (";
  const QList<QByteArray> formats = QImageReader::supportedImageFormats();
  for(const QByteArray& format : formats) {
    filter += "*.";
    filter += format.toLower();
    filter += ' ';
  }
  filter += ')';
  dlg.setNameFilter(filter);
  dlg.setNameFilterDetailsVisible(false);
  if(dlg.exec() == QDialog::Accepted) {
    QString filename;
    filename = dlg.selectedFiles().constFirst();
    ui.imageFile->setText(filename);
  }
}

void DesktopPreferencesDialog::onFolderBrowseClicked() {
  QFileDialog dlg;
  dlg.setAcceptMode(QFileDialog::AcceptOpen);
  dlg.setFileMode(QFileDialog::Directory);
  dlg.setOption(QFileDialog::ShowDirsOnly);
  dlg.setDirectory(QDir::home().path());
  if(dlg.exec() == QDialog::Accepted) {
    QString foldername;
    foldername = dlg.selectedFiles().constFirst();
    ui.imageFolder->setText(foldername);
  }
}

void DesktopPreferencesDialog::onBrowseDesktopFolderClicked()
{
  QFileDialog dlg;
  dlg.setAcceptMode(QFileDialog::AcceptOpen);
  dlg.setAcceptMode(QFileDialog::AcceptOpen);
  dlg.setFileMode(QFileDialog::DirectoryOnly);
  if (dlg.exec() == QDialog::Accepted) {
    QString dir;
    dir = dlg.selectedFiles().constFirst();
    uiDesktopFolder.desktopFolder->setText(dir);
  }
}

void DesktopPreferencesDialog::selectPage(QString name) {
  QWidget* page = findChild<QWidget*>(name + "Page");
  if(page)
    ui.tabWidget->setCurrentWidget(page);
}

void DesktopPreferencesDialog::setEditDesktopFolder(const bool enabled)
{
  editDesktopFolderEnabled = enabled;
  if (editDesktopFolderEnabled)
      setupDesktopFolderUi();
}

} // namespace PCManFM
