/* This file is part of Mapnik (c++ mapping toolkit)
 * Copyright (C) 2011 Artem Pavlenko
 *
 * Mapnik 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//$Id$

// stl
#include <iostream>

// qt
#include <QtGui>
#include <QSplitter>
#include <QTreeView>
#include <QListView>
#include <QTabWidget>
#include <QList>
#include <QItemDelegate>
#include <QSlider>

// mapnik
#include <mapnik/config_error.hpp>
#include <mapnik/load_map.hpp>
#include <mapnik/save_map.hpp>

// qt
#include "mainwindow.hpp"
#include "layerlistmodel.hpp"
#include "styles_model.hpp"
#include "layerwidget.hpp"
#include "layerdelegate.hpp"
#include "about_dialog.hpp"

MainWindow::MainWindow()
    : filename_(),
      default_extent_(-20037508.3428,-20037508.3428,20037508.3428,20037508.3428)
{        
    mapWidget_ = new MapWidget(this);
    QSplitter *splitter = new QSplitter(this); 
    QTabWidget *tabWidget=new QTabWidget;
    layerTab_ = new LayerTab;
    layerTab_->setFocusPolicy(Qt::NoFocus);
    layerTab_->setIconSize(QSize(16,16));
      
    //LayerDelegate *delegate = new LayerDelegate(this);   
    //layerTab_->setItemDelegate(delegate);
    //layerTab_->setItemDelegate(new QItemDelegate(this));
    //layerTab_->setViewMode(QListView::IconMode);
   
    layerTab_->setFlow(QListView::TopToBottom);
    tabWidget->addTab(layerTab_,tr("Layers"));

    // Styles tab
    styleTab_ = new StyleTab;
    tabWidget->addTab(styleTab_,tr("Styles"));   
    splitter->addWidget(tabWidget);
    splitter->addWidget(mapWidget_);
    QList<int> list;
    list.push_back(200);
    list.push_back(600);
    splitter->setSizes(list);
    
    mapWidget_->setFocusPolicy(Qt::StrongFocus);
    mapWidget_->setFocus();
   
    //setCentralWidget(mapWidget_);
    setCentralWidget(splitter);
    createActions();
    createMenus();
    createToolBars();
    createContextMenu();
    
    setWindowTitle(tr("Mapnik Viewer"));
    status=new QStatusBar(this);
    status->showMessage(tr(""));
    setStatusBar(status);
    resize(800,600);

    //connect mapview to layerlist
    connect(mapWidget_, SIGNAL(mapViewChanged()),layerTab_, SLOT(update()));
    // slider 
    connect(slider_,SIGNAL(valueChanged(int)),mapWidget_,SLOT(zoomToLevel(int)));
    // 
    connect(layerTab_,SIGNAL(update_mapwidget()),mapWidget_,SLOT(updateMap()));
    connect(layerTab_,SIGNAL(layerSelected(int)), 
            mapWidget_,SLOT(layerSelected(int)));
}


MainWindow::~MainWindow()
{
    delete mapWidget_;
}

void MainWindow::closeEvent(QCloseEvent* event)
{
    event->accept();
}

void MainWindow::createContextMenu()
{
    layerTab_->setContextMenuPolicy(Qt::ActionsContextMenu);
    layerTab_->addAction(openAct);
    layerTab_->addAction(layerInfo);
}

void MainWindow::open(QString const& path)
{
    if (path.isNull())
    {
        filename_ = QFileDialog::getOpenFileName(this,tr("Open Mapnik file"),
                                                 currentPath,"*.xml");
    }
    else
    {
        filename_ = path;
    }
    
    if (!filename_.isEmpty())
    {
        
        load_map_file(filename_);
        setWindowTitle(tr("%1 - Mapnik Viewer").arg(filename_));
    }
    
}

void MainWindow::reload()
{
    if (!filename_.isEmpty())
    {
        
        mapnik::box2d<double> bbox = mapWidget_->getMap()->get_current_extent();
        load_map_file(filename_);
        mapWidget_->zoomToBox(bbox);
        setWindowTitle(tr("%1 - *Reloaded*").arg(filename_));
    }
}

void MainWindow::save()
{
    QString initialPath = QDir::currentPath() + "/untitled.xml";
    QString filename = QFileDialog::getSaveFileName(this, tr("Save"),
                                                    initialPath,
                                                    tr("%1 Files (*.xml)")
                                                    .arg(QString("Mapnik definition")));
    if (!filename.isEmpty()) 
    {
        std::cout<<"saving "<< filename.toStdString() << std::endl;
        mapnik::save_map(*mapWidget_->getMap(),filename.toStdString());
    }
}

void MainWindow::load_map_file(QString const& filename)
{
    std::cout<<"loading "<< filename.toStdString() << std::endl;    
    unsigned width = mapWidget_->width();
    unsigned height = mapWidget_->height();
    boost::shared_ptr<mapnik::Map> map(new mapnik::Map(width,height)); 
    mapWidget_->setMap(map);
    try 
    {  
        mapnik::load_map(*map,filename.toStdString());
    }
    catch (mapnik::config_error & ex) 
    {
        std::cout << ex.what() << "\n";
    }
    catch (...)
    {
        std::cerr << "Exception caught in load_map\n";
    }
    layerTab_->setModel(new LayerListModel(map,this));
    styleTab_->setModel(new StyleModel(map,this));
    zoom_all();
}

void MainWindow::zoom_to_box()
{
    mapWidget_->setTool(MapWidget::ZoomToBox);
}

void MainWindow::pan()
{
    mapWidget_->setTool(MapWidget::Pan);   
}

void MainWindow::info()
{
    mapWidget_->setTool(MapWidget::Info);
}

void MainWindow::pan_left()
{
    mapWidget_->panLeft();
}

void MainWindow::pan_right()
{
    mapWidget_->panRight();
}

void MainWindow::pan_up()
{
    mapWidget_->panUp();
}

void MainWindow::pan_down()
{
    mapWidget_->panDown();
}

void MainWindow::about()
{
    about_dialog dlg;
    dlg.exec();
}

void MainWindow::export_as()
{
    QAction *action = qobject_cast<QAction *>(sender());
    QByteArray fileFormat = action->data().toByteArray();
    QString initialPath = QDir::currentPath() + "/map." + fileFormat;

    QString fileName = QFileDialog::getSaveFileName(this, tr("Export As"),
                                                    initialPath,
                                                    tr("%1 Files (*.%2);;All Files (*)")
                                                    .arg(QString(fileFormat.toUpper()))
                                                    .arg(QString(fileFormat)));
    if (!fileName.isEmpty()) 
    {
        QPixmap const& pix = mapWidget_->pixmap();
        pix.save(fileName);
    }
}

void MainWindow::print()
{    
   
    //Q_ASSERT(mapWidget_->pixmap());
    //QPrintDialog dialog(&printer, this);
    //if (dialog.exec()) {
    //   QPainter painter(&printer);
    //   QRect rect = painter.viewport();
    //   QSize size = mapWidget_->pixmap()->size();
    //   size.scale(rect.size(), Qt::KeepAspectRatio);
    //   painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
    //   painter.setWindow(mapWidget_->pixmap()->rect());
    //   painter.drawPixmap(0, 0, *mapWidget_->pixmap());
    //}
}

void MainWindow::createActions()
{ 
    //exportAct = new QAction(tr("&Export as ..."),this);
    //exportAct->setShortcut(tr("Ctrl+E"));
    //connect(exportAct, SIGNAL(triggered()), this, SLOT(export_as()));
    zoomAllAct = new QAction(QIcon(":/images/home.png"),tr("Zoom All"),this);
    connect(zoomAllAct, SIGNAL(triggered()), this, SLOT(zoom_all()));
    
    zoomBoxAct = new QAction(QIcon(":/images/zoombox.png"),tr("Zoom To Box"),this);
    zoomBoxAct->setCheckable(true);
    connect(zoomBoxAct, SIGNAL(triggered()), this, SLOT(zoom_to_box()));
    
    panAct = new QAction(QIcon(":/images/pan.png"),tr("Pan"),this);
    panAct->setCheckable(true);
    connect(panAct, SIGNAL(triggered()), this, SLOT(pan()));
    
    infoAct = new QAction(QIcon(":/images/info.png"),tr("Info"),this);
    infoAct->setCheckable(true);
    connect(infoAct, SIGNAL(triggered()), this, SLOT(info()));
   
    toolsGroup=new QActionGroup(this);
    toolsGroup->addAction(zoomBoxAct);
    toolsGroup->addAction(panAct);
    toolsGroup->addAction(infoAct);
    zoomBoxAct->setChecked(true);
       
    openAct=new QAction(tr("Open Map definition"),this);
    connect(openAct,SIGNAL(triggered()),this,SLOT(open()));
    saveAct=new QAction(tr("Save Map definition"),this);
    connect(saveAct,SIGNAL(triggered()),this,SLOT(save()));

    panLeftAct = new QAction(QIcon(":/images/left.png"),tr("&Pan Left"),this);
    connect(panLeftAct, SIGNAL(triggered()), this, SLOT(pan_left()));
    panRightAct = new QAction(QIcon(":/images/right.png"),tr("&Pan Right"),this);
    connect(panRightAct, SIGNAL(triggered()), this, SLOT(pan_right()));
    panUpAct = new QAction(QIcon(":/images/up.png"),tr("&Pan Up"),this);
    connect(panUpAct, SIGNAL(triggered()), this, SLOT(pan_up()));
    panDownAct = new QAction(QIcon(":/images/down.png"),tr("&Pan Down"),this);
    connect(panDownAct, SIGNAL(triggered()), this, SLOT(pan_down()));
   
    reloadAct = new QAction(QIcon(":/images/reload.png"),tr("Reload"),this);
    connect(reloadAct, SIGNAL(triggered()), this, SLOT(reload()));
   
    layerInfo = new QAction(QIcon(":/images/info.png"),tr("&Layer info"),layerTab_);
    connect(layerInfo, SIGNAL(triggered()), layerTab_,SLOT(layerInfo()));
    connect(layerTab_, SIGNAL(doubleClicked(QModelIndex const&)), layerTab_,SLOT(layerInfo2(QModelIndex const&)));
    foreach (QByteArray format, QImageWriter::supportedImageFormats()) 
    {
        QString text = tr("%1...").arg(QString(format).toUpper());
      
        QAction *action = new QAction(text, this);
        action->setData(format);
        connect(action, SIGNAL(triggered()), this, SLOT(export_as()));
        exportAsActs.append(action);
    }
   
    printAct = new QAction(QIcon(":/images/print.png"),tr("&Print ..."),this);
    printAct->setShortcut(tr("Ctrl+E"));
    connect(printAct, SIGNAL(triggered()), this, SLOT(print()));
    
    exitAct = new QAction(tr("E&xit"), this);
    exitAct->setShortcut(tr("Ctrl+Q"));
    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

    aboutAct = new QAction(QIcon(":/images/about.png"),tr("&About"), this);
    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
}

void MainWindow::createMenus()
{
    exportMenu = new QMenu(tr("&Export As"), this);
    foreach (QAction *action, exportAsActs)
        exportMenu->addAction(action); 
        
    fileMenu = new QMenu(tr("&File"),this);
    fileMenu->addAction(openAct);
    fileMenu->addAction(saveAct);
    fileMenu->addMenu(exportMenu);
    fileMenu->addAction(printAct);
    fileMenu->addSeparator();
    fileMenu->addAction(exitAct);
    menuBar()->addMenu(fileMenu);
    
    helpMenu = new QMenu(tr("&Help"), this);
    helpMenu->addAction(aboutAct);
    menuBar()->addMenu(helpMenu);
}

void MainWindow::createToolBars()
{
    fileToolBar = addToolBar(tr("Actions"));
    fileToolBar->addAction(zoomAllAct);
    fileToolBar->addAction(zoomBoxAct);
    fileToolBar->addAction(panAct);
    fileToolBar->addAction(panLeftAct);
    fileToolBar->addAction(panRightAct);
    fileToolBar->addAction(panUpAct);
    fileToolBar->addAction(panDownAct);
    fileToolBar->addAction(infoAct);
    fileToolBar->addAction(reloadAct);
    fileToolBar->addAction(printAct);
    slider_ = new QSlider(Qt::Horizontal,fileToolBar);
    slider_->setRange(1,18);
    slider_->setTickPosition(QSlider::TicksBelow);
    slider_->setTickInterval(1);
    slider_->setTracking(false);
    fileToolBar->addWidget(slider_);
    fileToolBar->addAction(aboutAct);
}



void MainWindow::set_default_extent(double x0,double y0, double x1, double y1)
{
    try 
    {
        boost::shared_ptr<mapnik::Map> map_ptr = mapWidget_->getMap();
        if (map_ptr) 
        {
            mapnik::projection prj(map_ptr->srs());
            prj.forward(x0,y0);
            prj.forward(x1,y1);
            default_extent_=mapnik::box2d<double>(x0,y0,x1,y1);
            mapWidget_->zoomToBox(default_extent_);
            std::cout << "SET DEFAULT EXT\n";
        }
    }
    catch (...) {}
}

void MainWindow::set_scaling_factor(double scaling_factor)
{
    mapWidget_->set_scaling_factor(scaling_factor);
}

void MainWindow::zoom_all()
{
    boost::shared_ptr<mapnik::Map> map_ptr = mapWidget_->getMap();
    if (map_ptr) 
    {
        map_ptr->zoom_all();
        mapnik::box2d<double> const& ext = map_ptr->get_current_extent();
        mapWidget_->zoomToBox(ext);
    }
}