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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "mainwindow.h"

#include <QtGui>
#include <unistd.h>
#include <QFileSystemWatcher>

#include "svgview.h"

MainWindow::MainWindow()
    : QMainWindow()
    , m_view(new SvgView)
    , m_watcher(NULL)
    , m_filehandle(NULL)
{
    QMenu *fileMenu = new QMenu(tr("&File"), this);
    QAction *openAction = fileMenu->addAction(tr("&Open..."));
    openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcuts(QKeySequence::Quit);

    menuBar()->addMenu(fileMenu);

    QMenu *viewMenu = new QMenu(tr("&View"), this);

    m_interactiveAction = viewMenu->addAction(tr("&Interactive"));
    m_interactiveAction->setEnabled(false);
    m_interactiveAction->setCheckable(true);
    m_interactiveAction->setChecked(false);
    connect(m_interactiveAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewInteractive(bool)));

    m_backgroundAction = viewMenu->addAction(tr("&Background"));
    m_backgroundAction->setEnabled(false);
    m_backgroundAction->setCheckable(true);
    m_backgroundAction->setChecked(false);
    m_backgroundAction->setVisible(false);
    connect(m_backgroundAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewBackground(bool)));

    m_outlineAction = viewMenu->addAction(tr("&Outline"));
    m_outlineAction->setEnabled(false);
    m_outlineAction->setCheckable(true);
    m_outlineAction->setChecked(true);
    connect(m_outlineAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewOutline(bool)));

    menuBar()->addMenu(viewMenu);

    QMenu *rendererMenu = new QMenu(tr("&Renderer"), this);
    m_nativeAction = rendererMenu->addAction(tr("&Native"));
    m_nativeAction->setCheckable(true);
    m_nativeAction->setChecked(true);
#ifndef QT_NO_OPENGL
    m_glAction = rendererMenu->addAction(tr("&OpenGL"));
    m_glAction->setCheckable(true);
#endif
    m_imageAction = rendererMenu->addAction(tr("&Image"));
    m_imageAction->setCheckable(true);

#ifndef QT_NO_OPENGL
    rendererMenu->addSeparator();
    m_highQualityAntialiasingAction = rendererMenu->addAction(tr("&High Quality Antialiasing"));
    m_highQualityAntialiasingAction->setEnabled(false);
    m_highQualityAntialiasingAction->setCheckable(true);
    m_highQualityAntialiasingAction->setChecked(false);
    connect(m_highQualityAntialiasingAction, SIGNAL(toggled(bool)), m_view, SLOT(setHighQualityAntialiasing(bool)));
#endif

    QActionGroup *rendererGroup = new QActionGroup(this);
    rendererGroup->addAction(m_nativeAction);
#ifndef QT_NO_OPENGL
    rendererGroup->addAction(m_glAction);
#endif
    rendererGroup->addAction(m_imageAction);

    menuBar()->addMenu(rendererMenu);

    connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
    connect(rendererGroup, SIGNAL(triggered(QAction*)),
            this, SLOT(setRenderer(QAction*)));

    setCentralWidget(m_view);
    setWindowTitle(tr("Yosys SVG Viewer"));
}

void MainWindow::openFile(const QString &path, bool reload)
{
    QString fileName;
    if (path.isNull())
        fileName = QFileDialog::getOpenFileName(this, tr("Open SVG File"),
                m_currentPath, "SVG files (*.svg *.svgz *.svg.gz)");
    else
        fileName = path;

    if (m_watcher) {
    	delete m_watcher;
	m_watcher = NULL;
    }
    if (m_filehandle) {
    	fclose(m_filehandle);
	m_filehandle = NULL;
    }

    if (!fileName.isEmpty()) {
        QFile file(fileName);
        if (!file.exists()) {
            QMessageBox::critical(this, tr("Open SVG File"),
                           QString("Could not open file '%1'.").arg(fileName));

            m_interactiveAction->setEnabled(false);
            m_outlineAction->setEnabled(false);
            m_backgroundAction->setEnabled(false);
            return;
        }

	QTransform oldTransform = m_view->transform();
        m_view->openFile(file);

        if (!fileName.startsWith(":/"))
	{
            m_currentPath = fileName;
            setWindowTitle(tr("%1 - Yosys SVG Viewer").arg(m_currentPath));

	    // just keep the file open so this process is found using 'fuser'
	    m_filehandle = fopen(fileName.toAscii(), "r");

	    m_watcher = new QFileSystemWatcher(this);
	    m_watcher->addPath(fileName);
	    connect(m_watcher, SIGNAL(fileChanged(const QString&)), this, SLOT(reloadFile()));
        }

        m_interactiveAction->setEnabled(true);
        m_outlineAction->setEnabled(true);
        m_backgroundAction->setEnabled(true);

	if (reload)
		m_view->setTransform(oldTransform);
	else
		resize(m_view->sizeHint() + QSize(80, 80 + menuBar()->height()));
    }
}

void MainWindow::reloadFile()
{
    // give the writer ~100 ms to finish writing
    usleep(100000);
	openFile(m_currentPath, true);
}

void MainWindow::setRenderer(QAction *action)
{
#ifndef QT_NO_OPENGL
    m_highQualityAntialiasingAction->setEnabled(false);
#endif

    if (action == m_nativeAction)
        m_view->setRenderer(SvgView::Native);
#ifndef QT_NO_OPENGL
    else if (action == m_glAction) {
        m_highQualityAntialiasingAction->setEnabled(true);
        m_view->setRenderer(SvgView::OpenGL);
    }
#endif
    else if (action == m_imageAction) {
        m_view->setRenderer(SvgView::Image);
    }
}