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** contained in the Technology Preview License Agreement accompanying

** this package.

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

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

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

#include "feature.h"

#include <QTextStream>

#include <QRegExp>

#include <QLibraryInfo>

#include <QFileInfo>

#include <QApplication>

#include <QPalette>

QT_BEGIN_NAMESPACE

QMap<QString, Feature*> Feature::instances;

Feature* Feature::getInstance(const QString &key)

{

    QString ukey = key.toUpper();

    if (!instances.contains(ukey))

        instances[ukey] = new Feature(ukey);

    return instances[ukey];

}

Feature::~Feature()

{

    delete d;

}

void Feature::clear()

{

    foreach (Feature *f, instances.values())

        delete f;

    instances.clear();

}

static QString listToHtml(const QString &title, const QStringList &list)

{

    if (list.isEmpty())

	return QString();

    QString str;

    QTextStream stream(&str);

    stream << "<h3>" << title << ":</h3>";

    stream << "<ul>";

    foreach (QString l, list)

	stream << "<li>" << l << "</li>";

    stream << "</ul>";

    return str;

}

static QString listToHtml(const QString &title, const QList<Feature*> &list)

{

    QStringList stringlist;

    foreach (Feature *f, list) {

        QString s("[%3] <a href=\"feature://%1\">%2</a>");

        s = s.arg(f->key()).arg(f->key());

        s = s.arg(f->selectable() && f->enabled() ? "On" : "Off");

        stringlist << s;

    }

    return listToHtml(title, stringlist);

}

static QString linkify(const QString &src)

{

    static QRegExp classRegexp("\\b(Q[\\w]+)");

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

    QString result = src;

    int pos = 0;

    while ((pos = classRegexp.indexIn(result, pos)) != -1) {

        QString className = classRegexp.cap(1);

        QString file = docRoot + "/html/" + className.toLower() + ".html";

        QFileInfo info(file);

        if (info.isFile()) {

            QString link = QString("<a href=\"file://%1\">%2</a>")

                           .arg(file).arg(className);

            result.replace(pos, className.length(), link);

            pos += link.length();

        } else {

            pos += className.length();

        }

    }

    return result;

}

QString Feature::toHtml() const

{

    QString str;

    QTextStream stream(&str);

    const QString linkColor = QApplication::palette().color(QPalette::Link).name();

    stream << "<h2><font size=\"+2\" color=\"" << linkColor << "\">"

           << key() << "</font></h2>"

	   << "<h2><font size=\"+2\">" << title() << "</font></h2>";

    if (!description().isEmpty())

        stream << "<p>" << description() << "</p>";

    stream << listToHtml("Section", QStringList(section()))

	   << listToHtml("Requires", dependencies())

	   << listToHtml("Required for", supports())

	   << listToHtml("See also", relations());

    return linkify(str);

}

Feature::Feature(const QString &key) : d(new FeaturePrivate(key)) {}

void Feature::setTitle(const QString &title)

{

    d->title = title;

}

void Feature::setSection(const QString &section)

{

    d->section = section;

}

void Feature::setDescription(const QString &description)

{

    d->description = description;

}

void Feature::addRelation(const QString &key)

{

    d->relations.insert(getInstance(key));

}

void Feature::setRelations(const QStringList &keys)

{

    foreach(QString key, keys)

        if (key != "???")

            addRelation(key);

}

QList<Feature*> Feature::relations() const

{

    return d->relations.toList();

}

void Feature::addDependency(const QString &key)

{

    Feature *f = getInstance(key);

    d->dependencies.insert(f);

    f->d->supports.insert(this);

}

void Feature::setDependencies(const QStringList &keys)

{

    foreach(QString key, keys)

        addDependency(key);

}

QList<Feature*> Feature::dependencies() const

{

    return d->dependencies.toList();

}

QList<Feature*> Feature::supports() const

{

    return d->supports.toList();

}

/*

    Returns a html formatted detailed description of this Feature.

*/

QString Feature::getDocumentation() const

{

    return QString() + "<h2>" + d->title + "</h2>";

}

void Feature::setEnabled(bool on)

{

    if (on == d->enabled)

        return;

    d->enabled = on;

    foreach (Feature *f, supports())

	f->updateSelectable();

    emit changed();

}

/*

  Update whether this feature should be selectable.

  A feature is selectable if all its dependencies are enabled.

*/

void Feature::updateSelectable()

{

    bool selectable = true;

    foreach (Feature *f, dependencies())

        if (!f->selectable() || !f->enabled())

            selectable = false;

    if (selectable != d->selectable) {

        d->selectable = selectable;

        foreach (Feature *f, supports())

            f->updateSelectable();

        emit changed();

    }

}

QT_END_NAMESPACE