/***************************************************************************
 * main.cpp
 * This file is part of the KDE project
 * copyright (C)2004-2007 by Tomaz Canabrava (tomaz.canabrava@gmail.com)
 *
 * This program 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 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
 * Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 ***************************************************************************/

#include "GraphScene.h"
#include "AbstractAction.h"

#include "node.h"
#include "edge.h"
#include "graphDocument.h"
#include "NodeItem.h"
#include "EdgeItem.h"
#include "OrientedEdgeItem.h"
#include <QGraphicsItem>
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsSceneWheelEvent>
#include <QKeyEvent>
#include <KDebug>
#include "node.h"
#include "graph.h"
#include "NodePropertiesWidget.h"
#include "MainWindow.h"
#include "edgepropertieswidget.h"

GraphScene::GraphScene(QObject *parent) : QGraphicsScene(parent) {
    _graphDocument = 0;
    _hideEdges = false;
    _nodePropertiesWidget = new NodePropertiesWidget(qobject_cast<MainWindow*>(parent));
    _edgePropertiesWidget = new EdgePropertiesWidget(qobject_cast<MainWindow*>(parent));
    _action = 0;
}

bool GraphScene::hideEdges() {
    return _hideEdges;
}

void GraphScene::setHideEdges(bool h) {
    _hideEdges = h;
    if ( ! _hideEdges ) {
        foreach(QGraphicsItem *i, _hidedEdges) {
            i->update();
        }
    }
}

void GraphScene::setActiveGraph(Graph *g) {
    kDebug() << "Active Graph Set";
    _graph = g;
}

void GraphScene::updateAfter(QGraphicsItem *item) {
    if (_hidedEdges.contains(item)) return;
    _hidedEdges << item;
}


void GraphScene::setAction(QAction *action) {
    _action = qobject_cast<AbstractAction*>(action);
}

void GraphScene::setActiveGraphDocument(GraphDocument *gd) {
    _graphDocument = gd;
    if (gd == 0) {
        return;
    }

    setSceneRect(QRectF(0,0, gd->width(), gd->height() ));
    QGraphicsRectItem *n = new QGraphicsRectItem(0,0, gd->width(), gd->height());
    n->setFlag(QGraphicsItem::ItemIsSelectable, false);
    n->setZValue(-1000);
    addItem(n);

    int size = _graphDocument->size();
   for (int i = 0; i < size; i++) {
        kDebug() << "Updating Graph at position: " << i;
        updateGraph(_graphDocument->at(i));
	connectGraphSignals(_graphDocument->at(i));
	kDebug() << "Graph Updated.";
    }
    connect( _graphDocument, SIGNAL(graphCreated(Graph*)), this, SLOT(connectGraphSignals(Graph*)));
   kDebug() << "Graph Document Set" << _graphDocument -> name();
}

void GraphScene::connectGraphSignals(Graph *g){
	connect( g, SIGNAL(nodeCreated(Node*)), this, SLOT(createNode(Node*)));
	connect( g, SIGNAL(edgeCreated(Edge*)), this, SLOT(createEdge(Edge*)));
}

QGraphicsItem *GraphScene::createNode(Node *n, bool f) {
    NodeItem *nItem = new NodeItem(n, 0, f);
    insertGraphItem(n->graph(), nItem);
    kDebug() << "Node Item Created";
    return nItem;
}

QGraphicsItem *GraphScene::createEdge(Edge *e) {
    QGraphicsItem *edgeItem = 0;

    if ( !e->graph()->directed() ){
      edgeItem = new EdgeItem(e);
    }else{
      edgeItem = new OrientedEdgeItem(e);
    }

    insertGraphItem(e->graph(), edgeItem);
    kDebug() << "Edge Created";
    return edgeItem;
}

void GraphScene::wheelEvent(QGraphicsSceneWheelEvent *wheelEvent) {
    NodeItem *nitem = qgraphicsitem_cast<NodeItem*>(itemAt(wheelEvent->scenePos()));
    if (!nitem) {
        wheelEvent->ignore();
        return;
    }
    Node *movableNode = nitem->node();
    int numDegrees = wheelEvent->delta();
    if (wheelEvent->orientation() == Qt::Vertical) {
        if (numDegrees > 0)
        {
            nitem->startUpSizing();
            movableNode->setWidth(movableNode->width()+0.25);
            nitem->update();
            nitem->endUpSizing();
        }
        else if (movableNode->width() > 0.5)
        {
            nitem->startDownSizing();
            movableNode->setWidth(movableNode->width()-0.25);
            nitem->update();
            nitem->endDownSizing();
        }
    }
    wheelEvent->accept();
}

void GraphScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent) {
    _action->executeMove(mouseEvent->scenePos());
}

void GraphScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent) {
    if (mouseEvent->button() == Qt::MidButton) {
        NodeItem *nitem = qgraphicsitem_cast<NodeItem*>(itemAt(mouseEvent->scenePos()));
        if (!nitem) return;
        Node *movableNode = nitem->node();
        nitem->startDownSizing();
        movableNode->setWidth(1);
        nitem->update();
        nitem->endDownSizing();
    }
    else if( mouseEvent->button() == Qt::RightButton){
	QGraphicsItem *i = itemAt(mouseEvent->scenePos());
        if (NodeItem *nItem = qgraphicsitem_cast<NodeItem*>(i)){
            _nodePropertiesWidget->setNode(nItem, mouseEvent->screenPos());
        }
        else if (EdgeItem *eItem = qgraphicsitem_cast<EdgeItem*>(i)){
            _edgePropertiesWidget->setEdge(eItem->edge(), mouseEvent->screenPos());
        }
	else if (OrientedEdgeItem *eItem = qgraphicsitem_cast<OrientedEdgeItem*>(i)){
	    _edgePropertiesWidget->setEdge(eItem->edge(), mouseEvent->screenPos());
        }
    }else if( mouseEvent -> button() == Qt::LeftButton){
	_action->executePress(mouseEvent->scenePos());
    }
}

void GraphScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent) {
     if (mouseEvent->button() == Qt::LeftButton){
	_action->executeRelease(mouseEvent->scenePos());
     }
}

void GraphScene::keyPressEvent(QKeyEvent *) {

}

void GraphScene::insertGraphItem(Graph *g, QGraphicsItem *item) {
    addItem(item);
    _hashGraphs.insert(g, item);
}

void GraphScene::clearGraph() {
    clear();
    _hashGraphs.clear();
}

void GraphScene::removeGItem(QGraphicsItem *gItem) {
  if (! _graphDocument ) return;
  
  int size = _graphDocument->size();
  
  for( int i = 0; i < size; i++){
    if (! _hashGraphs.empty() ){
      _hashGraphs.remove(_graphDocument->at(i), gItem);
    }
    if( !items().empty()){
      removeItem(gItem);
    }
  }
}

void GraphScene::updateGraph(Graph *g) {
/* This updates a particular graph by removing all nodes and edges associated to it
   and redrawn it on screen. now updateDocument is calling clearGraph() that will do the same thing, but for *all* graphs at the same time, but actually working. */

/*
    QList<QGraphicsItem*> items = _hashGraphs.values(g);
    kDebug() << "Quantity of items to be removed." << items.size();
    foreach(QGraphicsItem *i, items) {
        removeItem(i);
        delete i;
    }
    kDebug() << "Items removed";

    _hashGraphs.remove(g); */

    kDebug() << "Removed Graph from the hash";

    kDebug() << "Creating" << g->nodes().size() << "nodes";
    QList<Node*> nodes = g->nodes();
    foreach(Node *n, nodes) {
        createNode(n, false);
    }

    kDebug() << "Creating" << g->nodes().size() << "edges";
    QList<Edge*> edges = g->edges();
    foreach(Edge *e, edges) {
        createEdge( e);
    }
}

void GraphScene::updateDocument() {
    if (_graphDocument == 0) {
        kDebug() << "Graph Document is null. Please hit the developer.";
        return;
    }
    
    clearGraph();
    kDebug() << "Graph Document Size: " << _graphDocument->size();
    int size = _graphDocument->size();

    for (int i = 0; i < size; i++) {
        updateGraph( _graphDocument->at(i) );
	kDebug() << "updated Graph at " << i;
    }
}