/***************************************************************************
 *   Copyright (c) 2008 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#include "PreCompiled.h"

#ifndef _PreComp_
#endif

#include <boost/signals.hpp>
#include <boost/bind.hpp>

#include "Application.h"
#include "Document.h"
#include "DocumentObject.h"
#include "DocumentObserver.h"

using namespace App;

DocumentObserver::DocumentObserver() : _document(0)
{
    this->connectApplicationCreatedDocument = App::GetApplication().signalNewDocument.connect(boost::bind
        (&DocumentObserver::slotCreatedDocument, this, _1));
    this->connectApplicationDeletedDocument = App::GetApplication().signalDeleteDocument.connect(boost::bind
        (&DocumentObserver::slotDeletedDocument, this, _1));
}

DocumentObserver::DocumentObserver(Document* doc) : _document(0)
{
    // Connect to application and given document
    this->connectApplicationCreatedDocument = App::GetApplication().signalNewDocument.connect(boost::bind
        (&DocumentObserver::slotCreatedDocument, this, _1));
    this->connectApplicationDeletedDocument = App::GetApplication().signalDeleteDocument.connect(boost::bind
        (&DocumentObserver::slotDeletedDocument, this, _1));
    attachDocument(doc);
}

DocumentObserver::~DocumentObserver()
{
    // disconnect from application and document
    this->connectApplicationCreatedDocument.disconnect();
    this->connectApplicationDeletedDocument.disconnect();
    detachDocument();
}

Document* DocumentObserver::getDocument() const
{
    return this->_document;
}

void DocumentObserver::attachDocument(Document* doc)
{
    if (_document != doc) {
        detachDocument();
        _document = doc;

        this->connectDocumentCreatedObject = _document->signalNewObject.connect(boost::bind
            (&DocumentObserver::slotCreatedObject, this, _1));
        this->connectDocumentDeletedObject = _document->signalDeletedObject.connect(boost::bind
            (&DocumentObserver::slotDeletedObject, this, _1));
        this->connectDocumentChangedObject = _document->signalChangedObject.connect(boost::bind
            (&DocumentObserver::slotChangedObject, this, _1, _2));
    }
}

void DocumentObserver::detachDocument()
{
    if (this->_document) {
        this->_document = 0;
        this->connectDocumentCreatedObject.disconnect();
        this->connectDocumentDeletedObject.disconnect();
        this->connectDocumentChangedObject.disconnect();
    }
}

// -----------------------------------------------------------------------------

DocumentObjectObserver::DocumentObjectObserver()
{
}

DocumentObjectObserver::~DocumentObjectObserver()
{
}

DocumentObjectObserver::const_iterator DocumentObjectObserver::begin() const
{
    return _objects.begin();
}

DocumentObjectObserver::const_iterator DocumentObjectObserver::end() const
{
    return _objects.end();
}

void DocumentObjectObserver::addToObservation(App::DocumentObject* obj)
{
    _objects.insert(obj);
}

void DocumentObjectObserver::removeFromObservation(App::DocumentObject* obj)
{
    _objects.erase(obj);
}

void DocumentObjectObserver::slotCreatedDocument(const App::Document&)
{
}

void DocumentObjectObserver::slotDeletedDocument(const App::Document& Doc)
{
    if (this->getDocument() == &Doc) {
        this->detachDocument();
        _objects.clear();
        cancelObservation();
    }
}

void DocumentObjectObserver::slotCreatedObject(const App::DocumentObject&)
{
}

void DocumentObjectObserver::slotDeletedObject(const App::DocumentObject& Obj)
{
    std::set<App::DocumentObject*>::iterator it = _objects.find
        (const_cast<App::DocumentObject*>(&Obj));
    if (it != _objects.end())
        _objects.erase(it);
    if (_objects.empty())
        cancelObservation();
}

void DocumentObjectObserver::slotChangedObject(const App::DocumentObject&,
                                               const App::Property&)
{
}