/*
 * SaveWorkflowAsImageCmd.cpp
 *
 *  Created on: 2012-10-19
 *      Author: shenpenglin
 */
#include <QFileDialog>
#include <QPainter>
#include <QImageWriter>

#include "SaveWorkflowAsImageCmd.h"
#include "SaveHelper.h"
#include "PaiWorkflowDataModel.h"
#include "WorkflowWidget.h"
#include "ConsoleGUIService.h"
#include "WorkflowSceneManager.h"
#include "PaiFileDialog.h"
#include "PaiSettings.h"
#include "PaiMessageBox.h"
#include "TimeStampLogger.h"

using namespace pai::gui;
using namespace pai::objectmodel;
using namespace pai::graphics2d;

namespace pai
{

SaveWorkflowAsImageCmd::SaveWorkflowAsImageCmd(QUuid viewID, QUndoCommand *parent) :
    QUndoCommand(parent),
    m_ViewID(viewID)
{
}

SaveWorkflowAsImageCmd::~SaveWorkflowAsImageCmd()
{
}

void SaveWorkflowAsImageCmd::undo()
{

}

void SaveWorkflowAsImageCmd::redo()
{
	pai::gui::TimeStampLogger::GetInstance().WriteGUIBenchMarkLog("Workflow", true, "Save workflow as image");

    SaveWorkflowAsImageHelper();

    pai::gui::TimeStampLogger::GetInstance().WriteGUIBenchMarkLog("Workflow", false, "Save workflow as image");
}

bool SaveWorkflowAsImageCmd::SaveWorkflowAsImageHelper()
{
    // get active workflow name
    QString workflowName;
    if(SaveHelper::GetActiveWorkflowView())
    {
        PaiWorkflowDataModel * pWorkflow = SaveHelper::GetActiveWorkflowView()->GetWorkflow();
        if (pWorkflow == NULL)
        {
            return false;
        }

        int moduleCount = pWorkflow->GetModuleCount();

        if (moduleCount == 0)
        {
            return false; // if there are no modules return
        }

        workflowName = pWorkflow->GetName();
    }

    // get active workflow view
    WorkflowWidget* pActiveWorkflowView = SaveHelper::GetActiveWorkflowView();

    if (pActiveWorkflowView == NULL)
    {
        return false;
    }
    
    QRectF rect = pActiveWorkflowView->GetScene()->sceneRect();

    QPixmap pixmap(QSize(rect.width(), rect.height()));
    if (pixmap.isNull())
    {
    	return false;
    }
    
    pixmap.fill(Qt::white);
    QPainter painter(&pixmap);

    pActiveWorkflowView->GetScene()->render(&painter);

    PaiSettings settings;
    QString path = settings.value("Save_File", QDir::homePath()).toString();

    QStringList filters;
    filters << "Images (*.png *.jpg *.xpm)"
            << "All Files (*)";

    QString defaultName = workflowName;

    PaiFileDialog saveAsPictureDlg((QWidget*)pActiveWorkflowView,
            QObject::tr("Save File"), path,
            "Images (*.png *.jpg *.xpm)",
            QString("%1.png").arg(defaultName));
    saveAsPictureDlg.SetNameFilters(filters);
    saveAsPictureDlg.SetAcceptMode(AcceptSave);
    saveAsPictureDlg.SetAutoClearFileName(false);

    while (QDialog::Accepted == saveAsPictureDlg.exec())
    {
        QString fileName = saveAsPictureDlg.SelectedFiles().at(0);
        settings.setValue("Save_File", saveAsPictureDlg.GetSelectedPath());

        if (fileName.isEmpty())
        {
            return false;
        }

        QList<QByteArray> lstImageEnds = QImageWriter::supportedImageFormats();

        bool bFindWithEnd = false;
        bool bCanSave = false;
        for (int i = 0; i < lstImageEnds.size(); ++i)
        {
            bFindWithEnd = fileName.endsWith("." + lstImageEnds[i], Qt::CaseInsensitive);
            if (bFindWithEnd == true)
            {
                bCanSave = true;
                break;
            }
        }
        if (bFindWithEnd == false)
        {
            fileName += ".png";
        }
        
        if (bCanSave == false)
        {
            bCanSave = true;
            QFileInfo fi(fileName);
            if (fi.exists() && (!fi.isWritable()))
            {
               PaiMessageBox::Critical(&saveAsPictureDlg, QObject::tr("Error"),
                       QObject::tr("You do not have the permission necessary to save the file. Please select another one."),
                       PaiMessageBox::Ok);
               bCanSave = false;
            }
            else if (fi.exists())
            {
               int ret = PaiMessageBox::Warning(&saveAsPictureDlg, QObject::tr("Warning"), QObject::tr(
                       "The filename already exist! Do you want to overwrite the old one?"),
                       PaiMessageBox::Yes | PaiMessageBox::Cancel, PaiMessageBox::Yes);
               if (PaiMessageBox::Yes != ret)
               {
                   bCanSave = false;
               }
            }
            else
            {
                //do nothing
            }
        }
        // save the file
        if (bCanSave == true)
        {
            if (!pixmap.save(fileName))
            {
                PaiMessageBox::Critical(&saveAsPictureDlg, QObject::tr("Error"),
                        QObject::tr("Save workflow as image failed, as it was not possible to write to %1.").arg(fileName)
                        , PaiMessageBox::Ok);
                return false;
            }
            return true;
        }
    }
    return false;
}
}