/*
 *  infocenter.cpp
 *
 *  Copyright (C) 2010 David Hubner <hubnerd@ntlworld.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.
 *
 */

//Local
#include "infocenter.h"

//KDE
#include <KLocale>
#include <KIcon>
#include <KMenuBar>
#include <KMenu>
#include <KHelpMenu>
#include <KConfig>
#include <KGlobal>
#include <KConfigGroup>
#include <KDebug>
#include <KToolInvocation>
#include <KActionMenu>
#include <kxmlguifactory.h>
#include <KStandardAction>
#include <KActionCollection>
#include <KAboutApplicationDialog>
#include <KMessageBox>
#include <KFileDialog>
#include <KShortcut>
#include <KToolBar>

//QT
#include <QGridLayout>
#include <QProcess>
#include <QTextStream>
#include <QFile>
#include <QKeySequence>

KInfoCenter::KInfoCenter() : KXmlGuiWindow( 0, Qt::WindowContextHelpButtonHint )
{ 
  setWindowIcon(KIcon("hwinfo"));
  setWindowTitle(i18nc("Main window title", "KInfocenter"));
  setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  
  m_cWidget = new QWidget(this);
  setCentralWidget(m_cWidget);
  
  QVBoxLayout *cLayout = new QVBoxLayout(m_cWidget);
  Q_UNUSED(cLayout); 
  
  cLayout->setSpacing(0);
  cLayout->setContentsMargins(0, 0, 0, 0);
  createMainFrame();
  createToolBar();
  
  //TreeWidget
  connect(m_sideMenu,SIGNAL(activated(const KcmTreeItem*)),this,SLOT(itemClickedSlot(const KcmTreeItem*)));

  //SearchBox
  connect(m_searchText, SIGNAL(textChanged(QString)), m_sideMenu, SLOT(filterSideMenuSlot(QString)));
  connect(m_searchAction, SIGNAL(triggered(Qt::MouseButtons,Qt::KeyboardModifiers)),m_searchText,SLOT(setFocus()));
  
  //Buttons
  connect(m_moduleHelpAction, SIGNAL(triggered(bool)),this,SLOT(helpClickedSlot()));
  connect(m_exportAction, SIGNAL(triggered(bool)),this,SLOT(exportClickedSlot()));
  
  //Menu
  connect(m_aboutKcm, SIGNAL(triggered(bool)), this, SLOT(aboutKcmSlot()));
  
  //Startup 
  m_searchText->completionObject()->setItems(m_sideMenu->allChildKeywords());
  m_sideMenu->setFocus(Qt::OtherFocusReason);
  m_sideMenu->changeToFirstValidItem();
  
  m_toolTips = new ToolTipManager(m_sideMenu);
  setupGUI(QSize(640,480),ToolBar | Keys | Save | Create,"kinfocenterui.rc");
  
  m_helpAction->setMenu( dynamic_cast<KMenu*>( factory()->container("help", this) ) );
  menuBar()->hide();
  
  QAction *aboutApp = actionCollection()->action("help_about_app");
  aboutApp->setIcon(KIcon("hwinfo"));
}

KInfoCenter::~KInfoCenter()
{ 
  delete m_toolTips;
  
  //TreeWidget
  disconnect(m_sideMenu,SIGNAL(activated(const KcmTreeItem*)),this,SLOT(itemClickedSlot(const KcmTreeItem*)));
  
  //SearchBox
  disconnect(m_searchText, SIGNAL(textChanged(QString)), m_sideMenu, SLOT(filterSideMenuSlot(QString)));
  disconnect(m_searchAction, SIGNAL(triggered(Qt::MouseButtons,Qt::KeyboardModifiers)),m_searchText, SLOT(setFocus()));
  
  //Buttons
  disconnect(m_moduleHelpAction, SIGNAL(triggered(bool)),this,SLOT(helpClickedSlot()));
  disconnect(m_exportAction, SIGNAL(triggered(bool)),this,SLOT(exportClickedSlot()));
  
  //Menu
  disconnect(m_aboutKcm, SIGNAL(triggered(bool)), this, SLOT(aboutKcmSlot()));
}

bool KInfoCenter::eventFilter(QObject *watched, QEvent *event)
{
  if (watched == m_sideMenu && event->type() == QEvent::Move)
  {
    m_contain->setKcmTopEdge(m_sideMenu->y());
  }
  return false;
}

void KInfoCenter::createToolBar()
{
  KStandardAction::quit(this, SLOT(close()), actionCollection());
  KStandardAction::keyBindings(guiFactory(), SLOT(configureShortcuts()), actionCollection());
  
  toolBar()->setMovable(false);
  
  m_aboutKcm = actionCollection()->addAction("help_about_module");
  m_aboutKcm->setText(i18nc("Information about current module located in about menu","About Current Information Module"));
  m_aboutKcm->setIcon(KIcon("help"));
  m_aboutKcm->setEnabled(false);
  
  m_exportAction = new KAction(this);
  m_exportAction->setText(i18nc("Export button label","Export"));
  m_exportAction->setIcon(KIcon("document-export"));
  
  m_moduleHelpAction = new KAction(this);
  m_moduleHelpAction->setText(i18nc("Module help button label","Module Help"));
  m_moduleHelpAction->setIcon(KIcon("help-contextual"));
  
  m_helpAction = new KActionMenu( KIcon("help-contents"), i18nc("Help button label","Help"), this );
  m_helpAction->setDelayed( false );
  
  actionCollection()->addAction("export",m_exportAction);
  actionCollection()->addAction("helpModule",m_moduleHelpAction);
  actionCollection()->addAction("helpMenu",m_helpAction);
}

void KInfoCenter::createMainFrame()
{ 
  QWidget *mainDisplay = new QWidget();
  mainDisplay->setContentsMargins(0,0,0,0);

  QHBoxLayout *mainLayout = new QHBoxLayout(mainDisplay);
  
  m_splitter = new QSplitter(m_cWidget);
  m_splitter->setContentsMargins(0, 0, 0, 0);
  mainLayout->addWidget(m_splitter);
  
  createMenuFrame();
  
  m_contain = new KcmContainer(m_splitter);
  m_splitter->addWidget(m_contain);
  
  m_splitter->setStretchFactor(0, 0);
  m_splitter->setStretchFactor(1, 1);
  
  m_cWidget->layout()->addWidget(mainDisplay);
}
  
void KInfoCenter::createMenuFrame() 
{
  QWidget *sideFrame = new QWidget(m_splitter);
  sideFrame->setContentsMargins(0,0,0,0);
  
  QVBoxLayout *menuLayout = new QVBoxLayout(sideFrame);
  menuLayout->setContentsMargins(0, 0, 0, 0);

  m_searchText = new KLineEdit(sideFrame);
  m_searchText->setClearButtonShown(true);
  m_searchText->setClickMessage( i18nc( "Search Bar Click Message", "Search" ) );
  m_searchText->setCompletionMode( KGlobalSettings::CompletionPopup );
  m_searchText->completionObject()->setIgnoreCase(true);
  
  m_searchAction = new KAction(this);
  m_searchAction->setShortcut(KShortcut(QKeySequence(Qt::CTRL + Qt::Key_F)));
  m_searchAction->setText(i18nc("Kaction search label", "Search Modules"));
  m_searchAction->setIcon(KIcon("search"));
  
  actionCollection()->addAction("search",m_searchAction);
  
  m_sideMenu = new SidePanel(sideFrame);
  m_sideMenu->installEventFilter(this);
  
  menuLayout->addWidget(m_searchText);
  menuLayout->addWidget(m_sideMenu);
  m_splitter->addWidget(sideFrame);
}
  
void KInfoCenter::itemClickedSlot(const KcmTreeItem *item) 
{ 
  resetCondition();  
  if(item->type() != KcmTreeItem::CATEGORY) setKcm(item);
}

void KInfoCenter::setKcm(const KcmTreeItem *kcmItem) 
{ 
  m_contain->setKcm(kcmItem->kcm());
  
  setButtons(m_contain->buttons());
  m_aboutKcm->setEnabled(true);
}

void KInfoCenter::setButtons(const KCModule::Buttons buttons) 
{    
  if (buttons & KCModule::Help) m_moduleHelpAction->setEnabled(true);
  if (buttons & KCModule::Export) m_exportAction->setEnabled(true);
}

void KInfoCenter::resetCondition()
{
  m_moduleHelpAction->setEnabled(false);
  m_exportAction->setEnabled(false);

  m_aboutKcm->setEnabled(false);
}

void KInfoCenter::helpClickedSlot() 
{ 
  // Nicked from Ben, could not use KToolInvocation due to docpath.  
  QString docPath = m_contain->helpPath();
  
  KUrl url( KUrl("help:/"), docPath );
  QProcess::startDetached("khelpcenter", QStringList() << url.url());
}

void KInfoCenter::exportClickedSlot() 
{ 
  QString moduleName = m_contain->name();
  
  if(m_contain->exportText().isEmpty())
  {
    KInfoCenter::showError(this,i18n("Export of the module has produced no output."));
    return;
  }
  
  QString fileName = KFileDialog::getSaveFileName(KUrl(moduleName + ".txt"),QString(),this);
  if(fileName.isEmpty()) return;
  
  QFile exportFile(fileName);

  if(!exportFile.open(QIODevice::WriteOnly))
  {
    KInfoCenter::showError(this,i18n("Unable to open file to write export information"));
    return;
  }
  
  QTextStream exportTextStream( &exportFile );
  exportTextStream << (i18n("Export information for %1",moduleName))
  << "\n\n" << m_contain->exportText() << endl;
  
  exportFile.close();
  KInfoCenter::showError(this,i18n("Information exported"));
}

void KInfoCenter::aboutKcmSlot()
{
  KAboutApplicationDialog kcmAboutDialog(m_contain->kcmAboutData());
  kcmAboutDialog.exec();
}

void KInfoCenter::showError(QWidget *parent, const QString& errorMessage)
{
  KMessageBox::sorry(parent,errorMessage);
}