/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the tools applications of the Qt Toolkit.

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** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

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** $QT_END_LICENSE$

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****************************************************************************/

#include "graphics.h"

#include "feature.h"

#include "featuretreemodel.h"

#include <QtGui>

QT_BEGIN_NAMESPACE

static QString defaultPath;

class FeatureTextBrowser : public QTextBrowser {

    Q_OBJECT

public:

    FeatureTextBrowser(QWidget *parent) : QTextBrowser(parent) {

        QString docRoot;

        docRoot = QLibraryInfo::location(QLibraryInfo::DocumentationPath)

                  + "/html";

        setSearchPaths(searchPaths() << docRoot);

    }

signals:

    void featureClicked(const QString &feature);

public slots:

    void setSource(const QUrl &url)

    {

        if (url.scheme() == "feature")

            emit featureClicked(url.authority());

        else

            QTextBrowser::setSource(url);

    }

};

class Main : public QMainWindow {

    Q_OBJECT

public:

    Main();

    ~Main();

    void loadFeatures(const QString& filename);

    void loadConfig(const QString& filename);

public slots:

    void modelChanged();

    void showInfo(const QModelIndex &index);

    void showInfo(const QString &feature);

    void openConfig();

    void saveConfig();

    void expandView();

    void collapseView();

    void about();

    void aboutQt();

    void quit();

    void clear();

    void enableAll();

    void disableAll();

private:

    QTextBrowser *textBrowser;

    QTreeView *featureTree;

    FeatureTreeModel *featureModel;

    void init();

    void updateStatus(int numFeatures = -1);

    void completelyExpandIndex(const QModelIndex &parent);

};

template<typename Func>

void foreachIndex_helper(const QModelIndex &parent, Func func)

{

    const QAbstractItemModel *model = parent.model();

    const int rows = model->rowCount(parent);

    for (int i = 0; i < rows; ++i) {

        const QModelIndex child = model->index(i, 0, parent);

        func(child);

        foreachIndex_helper(child, func);

    }

}

template<typename Func>

void foreachIndex(const QAbstractItemModel *model, Func func)

{

    const int rows = model->rowCount(QModelIndex());

    for (int i = 0; i < rows; ++i) {

        const QModelIndex child = model->index(i, 0, QModelIndex());

        func(child);

        foreachIndex_helper(child, func);

    }

}

struct CheckStateSetter {

    CheckStateSetter(Qt::CheckState state, QAbstractItemModel *m)

        : checkState(state), model(m) {}

    void operator()(const QModelIndex &index) {

        model->setData(index, checkState, Qt::CheckStateRole);

    }

    Qt::CheckState checkState;

    QAbstractItemModel *model;

};

void Main::disableAll()

{

    QAbstractItemModel *model = featureTree->model();

    foreachIndex(model, CheckStateSetter(Qt::Unchecked, model));

}

void Main::enableAll()

{

    QAbstractItemModel *model = featureTree->model();

    foreachIndex(model, CheckStateSetter(Qt::Checked, model));

}

Main::Main()

{

    setWindowIcon(QIcon(QPixmap(logo_xpm)));

    QSplitter *splitter = new QSplitter(this);

    featureModel = new FeatureTreeModel(this);

    featureTree = new QTreeView(splitter);

    splitter->addWidget(featureTree);

    featureTree->setRootIsDecorated(true);

    featureTree->setModel(featureModel);

    featureTree->show();

    textBrowser = new FeatureTextBrowser(splitter);

    textBrowser->setFrameStyle(QFrame::WinPanel|QFrame::Sunken);

    splitter->addWidget(textBrowser);

    textBrowser->show();

    connect(textBrowser, SIGNAL(featureClicked(QString)),

            this, SLOT(showInfo(QString)));

    connect(featureTree, SIGNAL(activated(QModelIndex)),

	    this, SLOT(showInfo(QModelIndex)));

    connect(featureModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)),

            this, SLOT(modelChanged()));

    connect(featureTree, SIGNAL(clicked(QModelIndex)),

            this, SLOT(showInfo(QModelIndex)));

    setCentralWidget(splitter);

    QMenu *file = menuBar()->addMenu("&File");

    file->addAction("&Open...", this, SLOT(openConfig()),

                    Qt::CTRL + Qt::Key_O);

    file->addAction("&Save As...", this, SLOT(saveConfig()),

                    Qt::CTRL + Qt::Key_S);

    file->addSeparator();

    file->addAction("&Reset",  this, SLOT(clear()));

    file->addSeparator();

    file->addAction("E&xit",  this, SLOT(quit()), Qt::CTRL + Qt::Key_Q);

    QMenu *edit = menuBar()->addMenu("&Tools");

    edit->addAction("&Enable all features", this, SLOT(enableAll()));

    edit->addAction("&Disable all features", this, SLOT(disableAll()));

    menuBar()->addSeparator();

    QMenu *help = menuBar()->addMenu("&Help");

    help->addAction("&About", this, SLOT(about()));

    help->addAction("About &Qt", this, SLOT(aboutQt()));

    QToolBar *tb = new QToolBar("Expand/Collapse features");

    QToolButton *button;

    button = new QToolButton(tb);

    button->setIcon(QIcon(QPixmap(collapsed_xpm)));

    button->setText("Collapse");

    button->setToolTip("Collapse");

    connect(button, SIGNAL(clicked()), this, SLOT(collapseView()));

    tb->addWidget(button);

    button = new QToolButton(tb);

    button->setIcon(QIcon(QPixmap(expanded_xpm)));

    button->setText("Expand");

    button->setToolTip("Expand");

    connect(button, SIGNAL(clicked()), this, SLOT(expandView()));

    tb->addWidget(button);

    addToolBar(tb);

    init();

}

Main::~Main()

{

    delete textBrowser;

    delete featureModel;

    delete featureTree;

}

void Main::clear()

{

    QSettings settings;

    settings.clear();

    featureModel->clear();

    featureTree->reset();

    init();

}

void Main::quit()

{

    if (isWindowModified()) {

        int button = QMessageBox::question(this, "Quit Program",

                                           "You have unsaved changes.\n"

                                           "Do you want to quit anyway?",

                                           QMessageBox::Yes,

                                           QMessageBox::No);

        if (static_cast<QMessageBox::Button>(button) != QMessageBox::Yes)

            return;

    }

    QApplication::instance()->quit();

}

/*

  Recursively expand expand \a parent and all of its children.

*/

void Main::completelyExpandIndex(const QModelIndex &parent)

{

    featureTree->setExpanded(parent, true);

    const QAbstractItemModel *model = featureTree->model();

    const int rows = model->rowCount(parent);

    for (int i = 0; i < rows; ++i)

        completelyExpandIndex(model->index(i, 0, parent));

}

void Main::expandView()

{

    completelyExpandIndex(QModelIndex());

}

void Main::collapseView()

{

    const QAbstractItemModel *model = featureTree->model();

    const int rows = model->rowCount(QModelIndex());

    for (int i = 0; i < rows; ++i) {

        QModelIndex index = model->index(i, 0, QModelIndex());

        featureTree->setExpanded(index, false);

    }

}

void Main::updateStatus(int numFeatures)

{

    QSettings settings;

    QString featureFile = settings.value("featureFile").toString();

    QString configFile = settings.value("lastConfig").toString();

    QString message("Using features from %1");

    if (numFeatures >= 0) {

        QString s("%1 features loaded from %2");

        statusBar()->showMessage(s.arg(numFeatures).arg(featureFile));

    }

    QString appName = QApplication::applicationName();

    if (configFile.isEmpty())

        configFile = "New File";

    setWindowTitle(appName + " - " + configFile + "[*]");

}

void Main::modelChanged()

{

    setWindowModified(true);

}

void Main::init()

{

    QSettings settings;

    QString features = settings.value("featureFile").toString();

    if (features.isEmpty() || !QFileInfo(features).isFile()) {

        features = QFileDialog::getOpenFileName(this,

                                                "Open a feature file",

                                                defaultPath,

                                                "Qt Features (qfeatures.txt)");

    }

    settings.setValue("featureFile", features);

    loadFeatures(features);

    expandView();

    collapseView();

    QString confFile = settings.value("lastConfig").toString();

    if (confFile.isEmpty())

        return;

    loadConfig(confFile);

}

void Main::openConfig()

{

    QSettings settings;

    QString configDir;

    QString prevFile = settings.value("lastConfig").toString();

    if (!prevFile.isEmpty())

        configDir = QFileInfo(prevFile).path();

    if (configDir.isEmpty())

        configDir = defaultPath;

    QString configFile;

    configFile = QFileDialog::getOpenFileName(this,

                                              "Open a configuration file",

                                              configDir,

                                              "Header files (*.h)");

    enableAll();

    if (!configFile.isEmpty())

        loadConfig(configFile);

    settings.setValue("lastConfig", QFileInfo(configFile).absoluteFilePath());

}

void Main::saveConfig()

{

    QSettings settings;

    QString configDir;

    QString prevFile = settings.value("lastConfig").toString();

    if (!prevFile.isEmpty())

        configDir = QFileInfo(prevFile).path();

    if (configDir.isEmpty())

        configDir = defaultPath;

    QString configFile;

    configFile = QFileDialog::getSaveFileName(this,

                                              "Save configuration file",

                                              configDir,

                                              "Header files (*.h)");

    if (configFile.isEmpty())

        return;

    QFile file(configFile);

    if (!file.open(QIODevice::WriteOnly)) {

	QMessageBox::warning(this,"Warning",

                             "Cannot write to file " + configFile);

	return;

    }

    QTextStream stream(&file);

    FeatureTreeModel *model;

    model = static_cast<FeatureTreeModel*>(featureTree->model());

    model->writeConfig(stream);

    settings.setValue("lastConfig", QFileInfo(configFile).absoluteFilePath());

    setWindowModified(false);

    updateStatus();

}

void Main::loadConfig(const QString &filename)

{

    if (!QFileInfo(filename).isFile())

	return;

    QFile file(filename);

    if (!file.open(QIODevice::ReadOnly)) {

	QMessageBox::warning(this,"Warning", "Cannot open file " + filename);

	return;

    }

    QTextStream stream(&file);

    FeatureTreeModel *model;

    model = static_cast<FeatureTreeModel*>(featureTree->model());

    model->readConfig(stream);

    QSettings settings;

    settings.setValue("lastConfig", QFileInfo(filename).absoluteFilePath());

    setWindowModified(false);

    updateStatus();

}

void Main::loadFeatures(const QString &filename)

{

    Feature::clear();

    QFile file(filename);

    if (!file.open(QIODevice::ReadOnly)) {

	QMessageBox::warning(this,"Warning", "Cannot open file " + filename);

	return;

    }

    Feature *feature = 0;

    int numFeatures = 0;

    updateStatus(numFeatures);

    QTextStream s(&file);

    for (QString line = s.readLine(); !s.atEnd(); line = s.readLine()) {

	line = line.simplified();

	if (line.isEmpty())

	    continue;

	if (line.startsWith('#'))

	    continue;

	int colon = line.indexOf(':');

	if (colon < 0) { // assume description

            QString description = feature->description().simplified();

            description += " " + line;

            feature->setDescription(description);

	    continue;

	}

	QString tag = line.left(colon);

	QString value = line.mid(colon+1).simplified();

	if (tag == "Feature") {

            if (feature)

                featureModel->addFeature(feature);

            feature = Feature::getInstance(value);

            updateStatus(++numFeatures);

	} else if (tag == "Requires") {

            Q_ASSERT(feature);

            feature->setDependencies(value.split(' ', QString::SkipEmptyParts));

	} else if (tag == "Name") {

	    Q_ASSERT(feature);

            feature->setTitle(value);

	} else if (tag == "Section") {

	    Q_ASSERT(feature);

            feature->setSection(value);

	} else if (tag == "SeeAlso") {

	    Q_ASSERT(feature);

            feature->setRelations(value.split(' ', QString::SkipEmptyParts));

        } else if (tag == "Description") {

            Q_ASSERT(feature);

            feature->setDescription(value);

	}

    }

    if (feature)

        featureModel->addFeature(feature);

    featureTree->resizeColumnToContents(0);

    QSettings settings;

    settings.setValue("featureFile", QFileInfo(filename).absoluteFilePath());

    updateStatus();

}

void Main::showInfo(const QModelIndex &index)

{

    FeatureTreeModel *model;

    model = static_cast<FeatureTreeModel*>(featureTree->model());

    if (const Feature *feature = model->getFeature(index))

	textBrowser->setHtml(feature->toHtml());

    // Ensure index is visible

    QModelIndex parent = model->parent(index);

    while (parent.isValid()) {

        featureTree->setExpanded(parent, true);

        parent = model->parent(parent);

    }

    featureTree->scrollTo(index);

    featureTree->setCurrentIndex(index);

}

void Main::showInfo(const QString &feature)

{

    const Feature *f = Feature::getInstance(feature);

    FeatureTreeModel *model;

    model = static_cast<FeatureTreeModel*>(featureTree->model());

    showInfo(model->index(f));

}

void Main::about()

{

    QMessageBox::about(this, "About qconfig",

	"<p><b><font size=\"+2\">Qtopia Core build configuration</font></b></p>"

	"<p></p>"

	"<p>Version 2.0</p>"

	"<p>Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).</p>"

	"<p></p>"

    );

}

void Main::aboutQt()

{

    QMessageBox::aboutQt( this, tr("qconfig") );

}

QT_END_NAMESPACE

int main(int argc, char** argv)

{

    QT_USE_NAMESPACE

    QApplication app(argc,argv);

    app.setOrganizationDomain("trolltech.com");

    app.setOrganizationName("Trolltech");

    app.setApplicationName("QConfig");

    Main m;

    defaultPath = QLibraryInfo::location(QLibraryInfo::PrefixPath)