/***************************************************************************

    source::worx xtree
    Copyright © 2024-2025 c.holzheuer
    christoph.holzheuer@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.

***************************************************************************/


#include <QDebug>
#include <QFileDialog>
#include <QMessageBox>

#include <xqmainwindow.h>
#include <xqcommand.h>
#include <xqexception.h>
#include <xqitemfactory.h>
#include <xqnodewriter.h>


//! konstruktor.

XQMainWindow::XQMainWindow( QWidget* parent )
    : QMainWindow(parent)
{
  setupUi(this);
  setWindowTitle( QString("XTree %1").arg(c_Version));
  initMainWindow();
}


// setzt das working directory: dieses muss das 'xml' datenverzeichnis enthalten.

void XQMainWindow::setupWorkingDir()
{
  QDir dir = QDir::current();

  while (dir.exists())
  {
    QString xmlPath = dir.absoluteFilePath("xml");
    if (QDir(xmlPath).exists())
    {
      qDebug() << " --- CD TO: " << dir.absolutePath();
      QDir::setCurrent( dir.absolutePath() );
    }
    if (!dir.cdUp())
      return;
  }
}


//! actions & document struktur einrichten.

void XQMainWindow::initMainWindow()
{

  qDebug() << " --- initMainWindow(): here we go!";
  // das working dir setzen: 'xml' muss als unterverzeichnis vorhanden sein.
  setupWorkingDir();

  // als allererstes laden wir die Modelschreibungen
  XQItemFactory::instance().initItemFactory( c_ModelSheetFileName );

  _undoView->setStack( &_undoStack );

  _actionUndo->setData(   XQCommand::cmdUndo);
  _actionRedo->setData(   XQCommand::cmdRedo);
  _actionCut->setData(    XQCommand::cmdCut);
  _actionCopy->setData(   XQCommand::cmdCopy);
  _actionPaste->setData(  XQCommand::cmdPaste);
  _actionNew->setData(    XQCommand::cmdNew);
  _actionDelete->setData( XQCommand::cmdDelete);

  connect( _actionUndo,   &QAction::triggered, this, &XQMainWindow::onUndo );
  connect( _actionRedo,   &QAction::triggered, this, &XQMainWindow::onRedo );

  connect( _actionOpen,   &QAction::triggered, this, &XQMainWindow::onOpenDocument );
  connect( _actionSave,   &QAction::triggered, this, &XQMainWindow::onSaveDocument );
  connect( _actionSaveAs, &QAction::triggered, this, &XQMainWindow::onSaveDocumentAs );
  connect( _actionExit,   &QAction::triggered, this, &XQMainWindow::onExit );
  connect( _actionAbout,  &QAction::triggered, this, &XQMainWindow::onAbout );

  //connect( _mainTreeView, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(onDoubleClicked(QModelIndex)) );
  connect( _mainTreeView, SIGNAL(clicked(QModelIndex)),  this, SLOT(onTreeItemClicked(QModelIndex)) );
  connect( _tabWidget,    SIGNAL(tabBarClicked(int)),     this, SLOT(onTabClicked(int)) );


  connect( &_mainModelView, &XQViewModel::xqItemCreated, this, [=, this](XQItem* item)
  {
    // when a new main tree item has been created ...
    QString pID = item->contentNode()->attribute(c_ProjectID);
    _mainTreeView->setCurrentIndex( item->index() );
    // ... we set the current view to this node
    if( _documentStore.contains( pID ) )
      _tabWidget->setCurrentWidget( _documentStore[pID].modelView->treeTable() );
  } );

  try
  {
    // hand over undostack
    _mainModelView.setUndoStack(&_undoStack);
    // hand over left side navigation tree
    _mainModelView.setTreeTable(_mainTreeView);
    // #1. init the left side main tree view
    _mainModelView.initModel( c_MainModelName );

    // #2. load demo data
    loadDocument( c_DocumentFileName1 );
    //loadDocument( c_DocumentFileName2 );

    qDebug() << " --- all here: " << XQNode::s_Count;

  }  
  catch( XQException& exception )
  {
    qDebug() << exception.what();
    QMessageBox::critical( this, "Failure", QString("Failure: %1").arg(exception.what()) );
  }
  
}


//! slot für zentrales undo

void XQMainWindow::onUndo()
{
  qDebug() << " --- undo Pressed";
  if(_undoStack.canUndo())
    _undoStack.undo();

}


//! slot für zentrales redo

void XQMainWindow::onRedo()
{
  qDebug() << " --- redo Pressed";
  if(_undoStack.canRedo())
    _undoStack.redo();
}


//! erzeugt ein document

void XQMainWindow::onCreateDocument()
{
   qDebug() << " ---- create document Pressed!";
}


//! öffnet ein XML document

void XQMainWindow::onOpenDocument()
{
  QString fileName = QFileDialog::getOpenFileName(this, tr("Open Project"), c_DocumentDirectory, tr("project data(*.xtr)") );
  QFile file(fileName);

  if (!file.open(QFile::ReadOnly | QFile::Text))
  {
    QMessageBox::warning(this, "Warning", "Cannot load file: " + file.errorString());
    return;
  }
  // close dummy file ...
  file.close();

  loadDocument( fileName );
}


//! speichert ein XML document

void XQMainWindow::onSaveDocument()
{
  qDebug() << " ---- save Pressed!";
  saveDocument( c_ModelDummyFileName );
}


//! fragt nach einem datei-namen und speichert das akutelle XML
//! document unter diesem

void XQMainWindow::onSaveDocumentAs()
{
  QString fileName = QFileDialog::getSaveFileName(this, "Save as", c_DocumentDirectory, tr("project data(*.xtr)") );
  QFile file(fileName);
  // open dummy file
  if (!file.open(QFile::WriteOnly | QFile::Text))
  {
    QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
    return;
  }
  // close dummy file ...
  file.close();
  // and create a xml stream
  saveDocument( fileName );
}


//! wird aufgerufen, wenn ein XML geschlossen werden soll.

void XQMainWindow::onCloseDocument()
{
   qDebug() << " ---- close Pressed!";
}


//! beendet diese application

void XQMainWindow::onExit()
{
  qApp->exit();
}


//! zeigt den about-dialog

void XQMainWindow::onAbout()
{

  QMessageBox msgBox(QMessageBox::NoIcon, "About", "", QMessageBox::Ok);

  QString text = "<b>xtree concept</b><br>";
  text += "2024 c.holzheuer<br><br>";
  text += "<a href=\"https://sourceworx.org/xtree\">sourceworx.org/xtree</a>";

  msgBox.setTextFormat(Qt::RichText); // This allows you to click the link
  msgBox.setText( text );

  msgBox.exec();
}


//! wenn ein item im navigations-baum geklickt wird, soll die document
//! view rechts angepasst werden.

void XQMainWindow::onTreeItemClicked(const QModelIndex& index )
{

  XQItem& entry = XQItem::xqItemFromIndex(index);

  qDebug() << " --- mainWindow onTreeItemClicked:" << entry.text();

  return;
  //_mainTreeView->selectionModel()->select(index, QItemSelectionModel::Select);
  //entry->setBackground( QBrush( Qt::green ) );

    QString key = entry.attribute(c_ProjectID);
    if( _documentStore.contains(key) )
     _tabWidget->setCurrentWidget( _documentStore[key].modelView->treeTable() );

}


//! beim click auf ein tab im linken fenster wird der navigationsbaum angepasst.

void XQMainWindow::onTabClicked( int index )
{
  const QString& key = _documentStore[index].treeItem->attribute( c_ProjectID );
  qDebug() << " ---- tab clicked: " << index  << " : " << _documentStore[index].friendlyName << ": " << key;
  _mainTreeView->setCurrentIndex( _documentStore[index].treeItem->index() );
}


//! liest eine XML datei namens 'fileName'

void XQMainWindow::loadDocument( const QString& fileName )
{
 // gibts die Datei?
  if( !QFile::exists( fileName) )
    throw XQException( "no such file", fileName );

  // load data tree from xml file
  XQNodeFactory treeLoader;
  XQNodePtr rawTree = treeLoader.load_tree( qPrintable(fileName) );
 
  // versteckten root node ignorieren
  XQNodePtr contentRoot = rawTree->first_child();
  
  // Project-ID behandeln
  const QString& pID   = contentRoot->attribute(c_ProjectID);
  int idx = _documentStore.indexOf( pID );
  if( idx > -1 )
  {
    const XQDocument& doc = _documentStore.at(idx);
    QMessageBox::warning( this, "Load Document", QString("File: %1 already loaded.").arg( fileName ) );
    _mainTreeView->setCurrentIndex( doc.treeItem->index() );
    _tabWidget->setCurrentIndex( idx );
    return;
  }

  // 'friendly Name' ist ein Link auf ein anderes Attribute
  // das als Namen verwendet wird.
  const QString& fName = contentRoot->friendly_name();
  QString pTitle = QString("Project %1: %2").arg( pID, fName );

  // Eine neue TreeView erzeugn und im TabWidget parken.
  XQTreeTable* childTreeView = new XQTreeTable(_tabWidget);
  _tabWidget->addTab( childTreeView, pTitle );
  _tabWidget->setCurrentWidget( childTreeView );
  setWindowTitle( pTitle );

  // Ein neues Child-Model erzeugen
  XQChildModel* childModel = new XQChildModel(this);
  // die Modelstruktur anlegen
  childModel->initModel( c_ChildModelName );
  // Den globalen undo-stack ...
  childModel->setUndoStack(&_undoStack);
  // und die TreeView übergeben
  childModel->setTreeTable(childTreeView);

  // read the model data
  childModel->setContent( contentRoot->first_child() );

  /*
  // create new entry in the left side main tree view
   XQItem* newEntry = _mainModelView.createTreeEntry( contentRoot );
  _mainTreeView->setCurrentIndex( newEntry->index() );
  _documentStore.addDocument( fileName, pTitle, newEntry, childModel );
  */

}


//! speichert ein XML unter dem 'filename'

void XQMainWindow::saveDocument( const QString& fileName )
{
  XQNodeWriter nodeWriter;
  int curIdx = _tabWidget->currentIndex();
  XQNodePtr rootNode = _documentStore[curIdx].treeItem->contentNode();
  nodeWriter.dumpTree( rootNode, fileName );
}