#include <QStyleFactory>
#include <QMdiSubWindow>
#include <QSettings>
#include <QDir>
#include <QInputDialog>
#include <QMessageBox>
#include <QMenu>
#include <QIcon>
#include <QTimer>

#include "lthemeengine.h"
#include "appearancepage.h"
#include "paletteeditdialog.h"
#include "ui_appearancepage.h"
#include "ui_previewform.h"

AppearancePage::AppearancePage(QWidget *parent) : TabPage(parent), m_ui(new Ui::AppearancePage){
  m_ui->setupUi(this);
  QStringList keys = QStyleFactory::keys();
  keys.removeAll("lthemeengine-style"); //hide lthemeengine proxy style
  m_ui->styleComboBox->addItems(keys);
  connect(m_ui->paletteComboBox, SIGNAL(activated(int)), SLOT(updatePalette()));
  connect(m_ui->customPaletteButton, SIGNAL(clicked()), SLOT(updatePalette()));
  connect(m_ui->defaultPaletteButton, SIGNAL(clicked()), SLOT(updatePalette()));
  m_previewWidget = new QWidget(this);
  m_previewUi = new Ui::PreviewForm();
  m_previewUi->setupUi(m_previewWidget);
  QMdiSubWindow *w = m_ui->mdiArea->addSubWindow(m_previewWidget, Qt::CustomizeWindowHint | Qt::WindowMinMaxButtonsHint | Qt::WindowTitleHint);
  w->move(10, 10);

  QMenu *menu = new QMenu(this);
  menu->addAction(QIcon::fromTheme("list-add"), tr("Create"), this, SLOT(createColorScheme()));
  m_changeColorSchemeAction = menu->addAction(tr("Edit"), this, SLOT(changeColorScheme()));
  menu->addAction(tr("Create a Copy"), this, SLOT(copyColorScheme()));
  m_renameColorSchemeAction = menu->addAction(tr("Rename"), this, SLOT(renameColorScheme()));
  menu->addSeparator();
  m_removeColorSchemeAction = menu->addAction(tr("Remove"), this, SLOT(removeColorScheme()));
  m_ui->colorSchemeButton->setMenu(menu);
  m_changeColorSchemeAction->setIcon(QIcon::fromTheme("accessories-text-editor"));
  m_removeColorSchemeAction->setIcon(QIcon::fromTheme("list-remove"));
  connect(menu, SIGNAL(aboutToShow()), SLOT(updateActions()));

  readSettings();
}

AppearancePage::~AppearancePage(){
  if(m_selectedStyle){ delete m_selectedStyle; }
    delete m_ui;
    delete m_previewUi;
}

void AppearancePage::writeSettings(){
  QSettings settings(lthemeengine::configFile(), QSettings::IniFormat);
  settings.beginGroup("Appearance");
  settings.setValue("style", m_ui->styleComboBox->currentText());
  settings.setValue("custom_palette", m_ui->customPaletteButton->isChecked());
  settings.setValue("color_scheme_path", m_ui->colorSchemeComboBox->currentData().toString());
  settings.endGroup();
}

void AppearancePage::on_styleComboBox_activated(const QString &text){
  QStyle *style = QStyleFactory::create(text);
  if(!style){ return; }
  setStyle(m_previewWidget, style);
  if(m_selectedStyle){ delete m_selectedStyle; }
  m_selectedStyle = style;
  updatePalette();
}

void AppearancePage::on_colorSchemeComboBox_activated(int){
  m_customPalette = loadColorScheme(m_ui->colorSchemeComboBox->currentData().toString());
  updatePalette();
}

void AppearancePage::createColorScheme(){
  QString name = QInputDialog::getText(this, tr("Enter Color Scheme Name"), tr("File name:"));
  if(name.isEmpty()){ return; }
  if(!name.endsWith(".conf", Qt::CaseInsensitive)){ name.append(".conf"); }
  if(m_ui->colorSchemeComboBox->findText(name.section('.',0,0)) != -1){
    QMessageBox::warning(this, tr("Error"), tr("The color scheme \"%1\" already exists").arg(name.section('.',0,0)));
    return;
    }
  QString schemePath = lthemeengine::userColorSchemePath() + "/" + name;
  createColorScheme(schemePath, palette());
  m_ui->colorSchemeComboBox->addItem(name.section('.',0,0), schemePath);
  m_ui->colorSchemeComboBox->setCurrentIndex( m_ui->colorSchemeComboBox->count()-1);
  QTimer::singleShot(10, this, SLOT(changeColorScheme()) );
}

void AppearancePage::changeColorScheme(){
  if(m_ui->colorSchemeComboBox->currentIndex() < 0){ return; }
  if(!QFileInfo(m_ui->colorSchemeComboBox->currentData().toString()).isWritable()){
    QMessageBox::information(this, tr("Warning"), tr("The color scheme \"%1\" is read only").arg(m_ui->colorSchemeComboBox->currentText()));
    return;
    }
  PaletteEditDialog d(m_customPalette, m_selectedStyle, this);
  connect(&d, SIGNAL(paletteChanged(QPalette)), SLOT(setPreviewPalette(QPalette)));
  if(d.exec() == QDialog::Accepted){
    m_customPalette = d.selectedPalette();
    createColorScheme(m_ui->colorSchemeComboBox->currentData().toString(), m_customPalette);
    }
  updatePalette();
}

void AppearancePage::removeColorScheme(){
  int index = m_ui->colorSchemeComboBox->currentIndex();
  if(index < 0 || m_ui->colorSchemeComboBox->count() <= 1){ return; }
  if(!QFileInfo(m_ui->colorSchemeComboBox->currentData().toString()).isWritable()){
    QMessageBox::information(this, tr("Warning"), tr("The color scheme \"%1\" is read only").arg(m_ui->colorSchemeComboBox->currentText()));
    return;
    }
  int button = QMessageBox::question(this, tr("Confirm Remove"),tr("Are you sure you want to remove color scheme \"%1\"?").arg(m_ui->colorSchemeComboBox->currentText()), QMessageBox::Yes | QMessageBox::No);
  if(button != QMessageBox::Yes){ return; }
  if(QFile::remove(m_ui->colorSchemeComboBox->currentData().toString())){
    m_ui->colorSchemeComboBox->removeItem(index);
    on_colorSchemeComboBox_activated(0);
    }
}

void AppearancePage::copyColorScheme(){
  if(m_ui->colorSchemeComboBox->currentIndex() < 0) { return; }
  QString name = QInputDialog::getText(this, tr("Enter Color Scheme Name"), tr("File name:"),QLineEdit::Normal, tr("%1 (copy)").arg(m_ui->colorSchemeComboBox->currentText()));
  if(name.isEmpty() || name == m_ui->colorSchemeComboBox->currentText()){ return; }
  if(!name.endsWith(".conf", Qt::CaseInsensitive)) { name.append(".conf"); }
  if(m_ui->colorSchemeComboBox->findText(name.section('.',0,0)) != -1){
    QMessageBox::warning(this, tr("Error"), tr("The color scheme \"%1\" already exists").arg(name.section('.',0,0)));
    return;
    }
  QString newPath =  lthemeengine::userColorSchemePath() + "/" + name;
  QFile::copy(m_ui->colorSchemeComboBox->currentData().toString(), newPath);
  m_ui->colorSchemeComboBox->addItem(name.section('.',0,0), newPath);
  m_ui->colorSchemeComboBox->setCurrentIndex( m_ui->colorSchemeComboBox->count()-1);
  QTimer::singleShot(10, this, SLOT(changeColorScheme()) );
}

void AppearancePage::renameColorScheme(){
  int index = m_ui->colorSchemeComboBox->currentIndex();
  if(index < 0){ return; }
  if(!QFileInfo(m_ui->colorSchemeComboBox->currentData().toString()).isWritable()){
    QMessageBox::information(this, tr("Warning"), tr("The color scheme \"%1\" is read only").arg(m_ui->colorSchemeComboBox->currentText()));
    return;
    }
  QString name = QInputDialog::getText(this, tr("Enter Color Scheme Name"), tr("File name:"), QLineEdit::Normal, m_ui->colorSchemeComboBox->currentText());
  if(name.isEmpty() || name == m_ui->colorSchemeComboBox->currentText()){ return; }
  if(!name.endsWith(".conf", Qt::CaseInsensitive)){ name.append(".conf"); }
  if(m_ui->colorSchemeComboBox->findText(name.section('.',0,0)) != -1){
    QMessageBox::warning(this, tr("Error"), tr("The color scheme \"%1\" already exists").arg(name.section('.',0,0)));
    return;
    }
  QString newPath =  lthemeengine::userColorSchemePath() + "/" + name;
  QFile::rename(m_ui->colorSchemeComboBox->currentData().toString(), newPath);
  m_ui->colorSchemeComboBox->setItemText(index, name.section('.',0,0));
  m_ui->colorSchemeComboBox->setItemData(index, newPath);
}

void AppearancePage::updatePalette(){
  if(!m_selectedStyle){ return; }
  setPreviewPalette(m_ui->customPaletteButton->isChecked() ? m_customPalette : m_selectedStyle->standardPalette());
}

void AppearancePage::setPreviewPalette(const QPalette &p){
  QPalette previewPalette = palette();
  QPalette::ColorGroup colorGroup = QPalette::Disabled;
  if(m_ui->paletteComboBox->currentIndex() == 0){
    colorGroup = QPalette::Active;
    }
  else if(m_ui->paletteComboBox->currentIndex() == 1){
    colorGroup = QPalette::Inactive;
    }
  for (int i = 0; i < QPalette::NColorRoles; i++){
    QPalette::ColorRole role = QPalette::ColorRole(i);
    previewPalette.setColor(QPalette::Active, role, p.color(colorGroup, role));
    previewPalette.setColor(QPalette::Inactive, role, p.color(colorGroup, role));
    }
  setPalette(m_ui->mdiArea, previewPalette);
}

void AppearancePage::updateActions(){
  if(m_ui->colorSchemeComboBox->count() == 0 || !QFileInfo(m_ui->colorSchemeComboBox->currentData().toString()).isWritable()){
    m_changeColorSchemeAction->setVisible(false);
    m_renameColorSchemeAction->setVisible(false);
    m_removeColorSchemeAction->setVisible(false);
    }
  else{
    m_changeColorSchemeAction->setVisible(true);
    m_renameColorSchemeAction->setVisible(true);
    m_removeColorSchemeAction->setVisible(m_ui->colorSchemeComboBox->count() > 1);
    }
}

void AppearancePage::readSettings(){
  QSettings settings(lthemeengine::configFile(), QSettings::IniFormat);
  settings.beginGroup("Appearance");
  QString style = settings.value("style", "Fusion").toString();
  m_ui->styleComboBox->setCurrentText(style);
  m_ui->customPaletteButton->setChecked(settings.value("custom_palette", false).toBool());
  QString colorSchemePath = settings.value("color_scheme_path").toString();
  QDir("/").mkpath(lthemeengine::userColorSchemePath());
  findColorSchemes( QStringList() << lthemeengine::userColorSchemePath() << lthemeengine::sharedColorSchemePath());
  if(m_ui->colorSchemeComboBox->count() == 0){
    m_customPalette = palette(); //load fallback palette
    }
  else{
    int index = m_ui->colorSchemeComboBox->findData(colorSchemePath);
    if(index >= 0)
    m_ui->colorSchemeComboBox->setCurrentIndex(index);
    m_customPalette = loadColorScheme(m_ui->colorSchemeComboBox->currentData().toString());
    }
  on_styleComboBox_activated(m_ui->styleComboBox->currentText());
  settings.endGroup();
}

void AppearancePage::setStyle(QWidget *w, QStyle *s){
  foreach (QObject *o, w->children()){
    if(o->isWidgetType()){
      setStyle(qobject_cast<QWidget *>(o), s);
      }
    }
  w->setStyle(s);
}

void AppearancePage::setPalette(QWidget *w, QPalette p){
  foreach (QObject *o, w->children()){
    if(o->isWidgetType()){
      setPalette(qobject_cast<QWidget *>(o), p);
      }
    }
  w->setPalette(p);
}

void AppearancePage::findColorSchemes(QStringList paths){
  paths.removeDuplicates();
  for(int i=0; i<paths.length(); i++){
    if( !QFile::exists(paths[i])){ continue; }
    QDir dir(paths[i]);
    dir.setFilter(QDir::Files);
    dir.setNameFilters(QStringList() << "*.conf");
    foreach (QFileInfo info, dir.entryInfoList()){
      m_ui->colorSchemeComboBox->addItem(info.baseName(), info.filePath());
      }
    }
}

QPalette AppearancePage::loadColorScheme(const QString &filePath){
  QPalette customPalette;
  QSettings settings(filePath, QSettings::IniFormat);
  settings.beginGroup("ColorScheme");
  QStringList activeColors = settings.value("active_colors").toStringList();
  QStringList inactiveColors = settings.value("inactive_colors").toStringList();
  QStringList disabledColors = settings.value("disabled_colors").toStringList();
  settings.endGroup();
  if(activeColors.count() == QPalette::NColorRoles && inactiveColors.count() == QPalette::NColorRoles && disabledColors.count() == QPalette::NColorRoles){
    for (int i = 0; i < QPalette::NColorRoles; i++){
      QPalette::ColorRole role = QPalette::ColorRole(i);
      customPalette.setColor(QPalette::Active, role, QColor(activeColors.at(i)));
      customPalette.setColor(QPalette::Inactive, role, QColor(inactiveColors.at(i)));
      customPalette.setColor(QPalette::Disabled, role, QColor(disabledColors.at(i)));
      }
    }
  else{
    customPalette = palette(); //load fallback palette
    }
  return customPalette;
}

void AppearancePage::createColorScheme(const QString &name, const QPalette &palette){
  QSettings settings(name, QSettings::IniFormat);
  settings.beginGroup("ColorScheme");
  QStringList activeColors, inactiveColors, disabledColors;
  for (int i = 0; i < QPalette::NColorRoles; i++){
    QPalette::ColorRole role = QPalette::ColorRole(i);
    activeColors << palette.color(QPalette::Active, role).name();
    inactiveColors << palette.color(QPalette::Inactive, role).name();
    disabledColors << palette.color(QPalette::Disabled, role).name();
    }
  settings.setValue("active_colors",activeColors);
  settings.setValue("inactive_colors",inactiveColors);
  settings.setValue("disabled_colors",disabledColors);
  settings.endGroup();
}