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#include "interfaces.h"

#include "mainwindow.h"

#include "paintarea.h"

#include "plugindialog.h"

#include <QPluginLoader>

#include <QTimer>

#include <QScrollArea>

#include <QMessageBox>

#include <QActionGroup>

#include <QAction>

#include <QMenu>

#include <QMenuBar>

#include <QFileDialog>

#include <QColorDialog>

#include <QInputDialog>

#include <QApplication>

MainWindow::MainWindow() :

    paintArea(new PaintArea),

    scrollArea(new QScrollArea)

{

    scrollArea->setBackgroundRole(QPalette::Dark);

    scrollArea->setWidget(paintArea);

    setCentralWidget(scrollArea);

    createActions();

    createMenus();

    loadPlugins();

    setWindowTitle(tr("Plug & Paint"));

    if (!brushActionGroup->actions().isEmpty())

        brushActionGroup->actions().first()->trigger();

    QTimer::singleShot(500, this, SLOT(aboutPlugins()));

}

void MainWindow::open()

{

    const QString fileName = QFileDialog::getOpenFileName(this,

                                                          tr("Open File"), 

                                                          QDir::currentPath());

    if (!fileName.isEmpty()) {

        if (!paintArea->openImage(fileName)) {

            QMessageBox::information(this, tr("Plug & Paint"),

                                     tr("Cannot load %1.").arg(fileName));

            return;

        }

        paintArea->adjustSize();

    }

}

bool MainWindow::saveAs()

{

    const QString initialPath = QDir::currentPath() + "/untitled.png";

    const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),

                                                          initialPath);

    if (fileName.isEmpty()) {

        return false;

    } else {

        return paintArea->saveImage(fileName, "png");

    }

}

void MainWindow::brushColor()

{

    const QColor newColor = QColorDialog::getColor(paintArea->brushColor());

    if (newColor.isValid())

        paintArea->setBrushColor(newColor);

}

void MainWindow::brushWidth()

{

    bool ok;

    const int newWidth = QInputDialog::getInteger(this, tr("Plug & Paint"),

                                                  tr("Select brush width:"),

                                                  paintArea->brushWidth(),

                                                  1, 50, 1, &ok);

    if (ok)

        paintArea->setBrushWidth(newWidth);

}

//! [0]

void MainWindow::changeBrush()

{

    QAction *action = qobject_cast<QAction *>(sender());

    BrushInterface *iBrush = qobject_cast<BrushInterface *>(action->parent());

    const QString brush = action->text();

    paintArea->setBrush(iBrush, brush);

}

//! [0]

//! [1]

void MainWindow::insertShape()

{

    QAction *action = qobject_cast<QAction *>(sender());

    ShapeInterface *iShape = qobject_cast<ShapeInterface *>(action->parent());

    const QPainterPath path = iShape->generateShape(action->text(), this);

    if (!path.isEmpty())

        paintArea->insertShape(path);

}

//! [1]

//! [2]

void MainWindow::applyFilter()

{

    QAction *action = qobject_cast<QAction *>(sender());

    FilterInterface *iFilter =

            qobject_cast<FilterInterface *>(action->parent());

    const QImage image = iFilter->filterImage(action->text(), paintArea->image(),

                                              this);

    paintArea->setImage(image);

}

//! [2]

void MainWindow::about()

{

   QMessageBox::about(this, tr("About Plug & Paint"),

            tr("The <b>Plug & Paint</b> example demonstrates how to write Qt "

               "applications that can be extended through plugins."));

}

//! [3]

void MainWindow::aboutPlugins()

{

    PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);

    dialog.exec();

}

//! [3]

void MainWindow::createActions()

{

    openAct = new QAction(tr("&Open..."), this);

    openAct->setShortcuts(QKeySequence::Open);

    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

    saveAsAct = new QAction(tr("&Save As..."), this);

    saveAsAct->setShortcuts(QKeySequence::SaveAs);

    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

    exitAct = new QAction(tr("E&xit"), this);

    exitAct->setShortcuts(QKeySequence::Quit);

    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

    brushColorAct = new QAction(tr("&Brush Color..."), this);

    connect(brushColorAct, SIGNAL(triggered()), this, SLOT(brushColor()));

    brushWidthAct = new QAction(tr("&Brush Width..."), this);

    connect(brushWidthAct, SIGNAL(triggered()), this, SLOT(brushWidth()));

    brushActionGroup = new QActionGroup(this);

    aboutAct = new QAction(tr("&About"), this);

    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

    aboutQtAct = new QAction(tr("About &Qt"), this);

    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

    aboutPluginsAct = new QAction(tr("About &Plugins"), this);

    connect(aboutPluginsAct, SIGNAL(triggered()), this, SLOT(aboutPlugins()));

}

void MainWindow::createMenus()

{

    fileMenu = menuBar()->addMenu(tr("&File"));

    fileMenu->addAction(openAct);

    fileMenu->addAction(saveAsAct);

    fileMenu->addSeparator();

    fileMenu->addAction(exitAct);

    brushMenu = menuBar()->addMenu(tr("&Brush"));

    brushMenu->addAction(brushColorAct);

    brushMenu->addAction(brushWidthAct);

    brushMenu->addSeparator();

    shapesMenu = menuBar()->addMenu(tr("&Shapes"));

    filterMenu = menuBar()->addMenu(tr("&Filter"));

    menuBar()->addSeparator();

    helpMenu = menuBar()->addMenu(tr("&Help"));

    helpMenu->addAction(aboutAct);

    helpMenu->addAction(aboutQtAct);

    helpMenu->addAction(aboutPluginsAct);

}

//! [4]

void MainWindow::loadPlugins()

{

    foreach (QObject *plugin, QPluginLoader::staticInstances())

        populateMenus(plugin);

//! [4] //! [5]

    pluginsDir = QDir(qApp->applicationDirPath());

#if defined(Q_OS_WIN)

    if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")

        pluginsDir.cdUp();

#elif defined(Q_OS_MAC)

    if (pluginsDir.dirName() == "MacOS") {

        pluginsDir.cdUp();

        pluginsDir.cdUp();

        pluginsDir.cdUp();

    }

#endif

    pluginsDir.cd("plugins");

//! [5]

//! [6]

    foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {

        QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));

        QObject *plugin = loader.instance();

        if (plugin) {

            populateMenus(plugin);

            pluginFileNames += fileName;

//! [6] //! [7]

        }

//! [7] //! [8]

    }

//! [8]

//! [9]

    brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());

    shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());

    filterMenu->setEnabled(!filterMenu->actions().isEmpty());

}

//! [9]

//! [10]

void MainWindow::populateMenus(QObject *plugin)

{

    BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin);

    if (iBrush)

        addToMenu(plugin, iBrush->brushes(), brushMenu, SLOT(changeBrush()),

                  brushActionGroup);

    ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin);

    if (iShape)

        addToMenu(plugin, iShape->shapes(), shapesMenu, SLOT(insertShape()));

    FilterInterface *iFilter = qobject_cast<FilterInterface *>(plugin);

    if (iFilter)

        addToMenu(plugin, iFilter->filters(), filterMenu, SLOT(applyFilter()));

}

//! [10]

void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,

                           QMenu *menu, const char *member,

                           QActionGroup *actionGroup)

{

    foreach (QString text, texts) {

        QAction *action = new QAction(text, plugin);

        connect(action, SIGNAL(triggered()), this, member);

        menu->addAction(action);

        if (actionGroup) {

            action->setCheckable(true);

            actionGroup->addAction(action);

        }

    }

}